Develop Reference

Sping Boot Java backend application process gets killed

I have packaged my spring boot rest backend with mvn package.
When I run the jar on the server with java -jar ... the application starts and gets killed after a few seconds.
I also see that on the linux top view, that the java process goes over 300% CPU. Is that maybe the reason the process gets killed? And if yes, what can I do?
My spring boot application is not very big. Actually its almost empty.
Logs:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.2.RELEASE)
2020-01-26 07:40:36.423 INFO 8144 --- [ main] d.c.c.CarorderprocessApplication : Starting CarorderprocessApplication v0.0.1-SNA
PSHOT on dedi1055.your-server.de with PID 8144 (/usr/www/users/waqfek/software_backend/carorderprocess-0.0.1-SNAPSHOT.jar started by waqfek in /us
r/www/users/waqfek/software_backend)
2020-01-26 07:40:36.426 INFO 8144 --- [ main] d.c.c.CarorderprocessApplication : No active profile set, falling back to default
profiles: default
2020-01-26 07:40:36.487 INFO 8144 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servle
t.context.AnnotationConfigServletWebServerApplicationContext#5cbc508c: startup date [Sun Jan 26 07:40:36 CET 2020]; root of context hierarchy
2020-01-26 07:40:37.614 INFO 8144 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotati
on.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerB
ySpringCGLIB$$d289c8bd] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-01-26 07:40:37.915 INFO 8144 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8081 (http)
2020-01-26 07:40:37.939 INFO 8144 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-01-26 07:40:37.940 INFO 8144 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.31
2020-01-26 07:40:37.949 INFO 8144 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library whi
ch allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib/amd64:/usr/lib/x86_64-lin
ux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib]
2020-01-26 07:40:38.014 INFO 8144 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationCon
text
2020-01-26 07:40:38.014 INFO 8144 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization com
pleted in 1530 ms
2020-01-26 07:40:38.159 INFO 8144 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to:
[/*]
2020-01-26 07:40:38.159 INFO 8144 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [
/*]
2020-01-26 07:40:38.159 INFO 8144 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to:
[/*]
2020-01-26 07:40:38.159 INFO 8144 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*
]
2020-01-26 07:40:38.160 INFO 8144 --- [ost-startStop-1] .s.DelegatingFilterProxyRegistrationBean : Mapping filter: 'springSecurityFilterChain' to
: [/*]
2020-01-26 07:40:38.160 INFO 8144 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2020-01-26 07:40:38.302 INFO 8144 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2020-01-26 07:40:38.306 WARN 8144 --- [ main] com.zaxxer.hikari.util.DriverDataSource : Registered driver with driverClassName=com.mysql.jdbc.Driver was not found, trying direct instantiation.
2020-01-26 07:40:38.491 INFO 8144 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2020-01-26 07:40:38.534 INFO 8144 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2020-01-26 07:40:38.548 INFO 8144 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2020-01-26 07:40:38.625 INFO 8144 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.2.17.Final}
2020-01-26 07:40:38.627 INFO 8144 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2020-01-26 07:40:38.661 INFO 8144 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2020-01-26 07:40:38.824 INFO 8144 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2020-01-26 07:40:39.086 INFO 8144 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2020-01-26 07:40:39.172 INFO 8144 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-01-26 07:40:39.406 INFO 8144 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#5cbc508c: startup date [Sun Jan 26 07:40:36 CET 2020]; root of context hierarchy
2020-01-26 07:40:39.444 WARN 8144 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2020-01-26 07:40:39.492 INFO 8144 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2020-01-26 07:40:39.494 INFO 8144 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2020-01-26 07:40:39.526 INFO 8144 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-01-26 07:40:39.526 INFO 8144 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2020-01-26 07:40:39.867 INFO 8144 --- [ main] .s.s.UserDetailsServiceAutoConfiguration :
Using generated security password: 8167df1e-24d1-4ebf-bb03-53e2385a1229
2020-01-26 07:40:40.030 INFO 8144 --- [ main] o.s.s.web.DefaultSecurityFilterChain : Creating filter chain: org.springframework.security.web.util.matcher.AnyRequestMatcher#1, [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter#d2de489, org.springframework.security.web.context.SecurityContextPersistenceFilter#28cda624, org.springframework.security.web.header.HeaderWriterFilter#5340477f, org.springframework.security.web.csrf.CsrfFilter#6f15d60e, org.springframework.security.web.authentication.logout.LogoutFilter#71687585, org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter#66ea810, org.springframework.security.web.authentication.ui.DefaultLoginPageGeneratingFilter#5276d6ee, org.springframework.security.web.authentication.www.BasicAuthenticationFilter#2f953efd, org.springframework.security.web.savedrequest.RequestCacheAwareFilter#7eecb5b8, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter#475c9c31, org.springframework.security.web.authentication.AnonymousAuthenticationFilter#14bdbc74, org.springframework.security.web.session.SessionManagementFilter#7139992f, org.springframework.security.web.access.ExceptionTranslationFilter#446a1e84, org.springframework.security.web.access.intercept.FilterSecurityInterceptor#169bb4dd]
2020-01-26 07:40:40.112 INFO 8144 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2020-01-26 07:40:40.113 INFO 8144 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Bean with name 'dataSource' has been autodetected for JMX exposure
2020-01-26 07:40:40.118 INFO 8144 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2020-01-26 07:40:40.142 INFO 8144 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8081 (http) with context path ''
2020-01-26 07:40:40.145 INFO 8144 --- [ main] d.c.c.CarorderprocessApplication : Started CarorderprocessApplication in 4.002 seconds (JVM running for 4.521)
Killed
...
top - 08:51:43 up 137 days, 11:30, 2 users, load average: 0.86, 0.39, 0.30
Tasks: 4 total, 1 running, 3 sleeping, 0 stopped, 0 zombie
%Cpu(s): 30.7 us, 0.9 sy, 0.0 ni, 68.1 id, 0.2 wa, 0.0 hi, 0.1 si, 0.0 st
KiB Mem : 16119112 total, 4416660 free, 7332300 used, 4370152 buff/cache
KiB Swap: 4194300 total, 3625572 free, 568728 used. 8221460 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
20338 waqfek 20 0 7069792 299952 16808 S 247.5 1.9 0:07.45 java
16765 waqfek 20 0 38960 3032 2704 R 0.0 0.0 0:00.57 top
27373 waqfek 20 0 14092 3600 3048 S 0.0 0.0 0:00.16 bash
28746 waqfek 20 0 14072 3524 2988 S 0.0 0.0 0:00.00 bash
I only have three files in my project:
1.:
package ...
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class CarorderprocessApplication {
public static void main(String[] args) {
SpringApplication.run(CarorderprocessApplication.class, args);
}
}
Then I have application.properties file with information for database connection and port.
pom.xml:
https://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0
org.springframework.boot
spring-boot-starter-parent
2.0.2.RELEASE
de.countandcare
carorderprocess
0.0.1-SNAPSHOT
carorderprocess
Demo project for Spring Boot
<dependencyManagement>
<dependencies>
</dependencies>
</dependencyManagement>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
<version>2.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.17</version>
</dependency>
<dependency>
<groupId>javax.persistence</groupId>
<artifactId>persistence-api</artifactId>
<version>1.0.2</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.5.2</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>

Some ideas to check:
Try to run as detached: java -jar yourapp.jar &
Try ( just once ) to run under root
Check logs: journalctl -ex for details of who exactly has killed your application.
Depends on results, can plan next steps - typically which settings to adjust.

SpringBoot RequestMapping method not called

I am learning SpringBoot. using Spring JavaPersistenceAPI(JPA) and apache derby as the database. I am having trouble mapping a URL to a method.
I have Topics:
#Entity
public class Topic {
#Id
private String id;
private String name;
private String description;
public Topic() {
}
public Topic(String id, String name, String description) {
this.id = id;
this.name = name;
this.description = description;
} ... getters & setters...
And I have a Topic controller. It works fine:
#RestController
public class TopicController {
#Autowired
private TopicService topicServ;
#RequestMapping("/topics")
public List<Topic> getAllTopics() {
return topicServ.getAllTopics();
}
#RequestMapping("/topics/{topicId}")
public Topic getTopic(#PathVariable String topicId) {
return topicServ.getTopic(topicId);
}... more methods (they work fine)
Every topic has courses:
#Entity
public class Course {
private String id;
private String name;
private String description;
#ManyToOne
private Topic topic;
public Course() {
}
public Course(String id, String name, String description, String topicId) {
this.id = id;
this.name = name;
this.description = description;
this.setTopic(new Topic(topicId, "CourseConstructorNAME", "CourseConstructorDESCRIPTION"));
} ... getters & setters ...
And I have the courses controller, where I am finding the problem:
#RestController
public class CourseController {
#Autowired
private CourseService courseServ;
#GetMapping(value = "/topics/{topicId}/courses")
public List<Course> getAllCourses(#PathVariable("topicId") String topicId){
System.out.println("Hi"); *<-- does not print anything*
return courseServ.getAllCourses(topicId);
}
The problem is that, issuing a GET request to http://localhost:8080/topics/java/courses , returns a 404 error message:
{
"timestamp": "2018-11-26T19:30:08.871+0000",
"status": 404,
"error": "Not Found",
"message": "No message available",
"path": "/topics/java/courses"
}
I expect a list of courses corresponding to the topic id fetched from the URL. The failure confuses me because the topic controller works fine and it is almost the same.
So, because the sysout I put above doesn't print anything, I must be doing something really dumb; but just in case, here is the code for courseServ:
#Service
public class CourseService {
#Autowired
private CourseRepository courseRepo;
public List<Course> getAllCourses(String topicId){
System.out.println("Calling get all courses from course service");
List<Course> theList = new ArrayList<Course>();
courseRepo.findByTopic_Id(topicId).forEach(theList::add);
System.out.println(theList.toString());
return theList;
}
and here is courseRepo:
public interface CourseRepository extends CrudRepository<Course, String> {
public List<Course> findByTopic_Id(String topicId);
}
Here is the spring console log:
2018-11-26 13:29:25.142 INFO 16252 --- [ main] P.ProjectNameWithJpaApplication : Starting ProjectNameWithJpaApplication on JulioPHX with PID 16252 (C:\SpringToolSuite\workspace\ProjectNameWithJPA\target\classes started by JulioPHX in C:\SpringToolSuite\workspace\ProjectNameWithJPA)
2018-11-26 13:29:25.148 INFO 16252 --- [ main] P.ProjectNameWithJpaApplication : No active profile set, falling back to default profiles: default
2018-11-26 13:29:27.107 INFO 16252 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2018-11-26 13:29:27.238 INFO 16252 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 116ms. Found 1 repository interfaces.
2018-11-26 13:29:28.254 INFO 16252 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$c18d73e6] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-11-26 13:29:29.466 INFO 16252 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-11-26 13:29:29.501 INFO 16252 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-11-26 13:29:29.502 INFO 16252 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.12
2018-11-26 13:29:29.525 INFO 16252 --- [ main] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_191\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_191/bin/server;C:/Program Files/Java/jre1.8.0_191/bin;C:/Program Files/Java/jre1.8.0_191/lib/amd64;C:\Scripts\;C:\;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Python37\;C:\Python37\Scripts;C:\ProgramData\Oracle\Java\javapath;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\iCLS\;C:\Program Files\Intel\Intel(R) Management Engine Components\iCLS\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Git\cmd;C:\Program Files\RedHat\java-1.8.0-openjdk-1.8.0.161-1\bin;C:\WINDOWS\System32\OpenSSH\;C:\MinGW\bin;C:\Program Files\MicrosoftVSCode\bin;C:\cygwin64\bin;C:\Program Files\apache-maven-3.5.4\bin;C:\Users\JulioPHX\AppData\Local\Microsoft\WindowsApps;;C:\Users\JulioPHX\Microsoft VS Code\bin;C:\SpringToolSuite\sts-bundle\sts-3.9.6.RELEASE;;.]
2018-11-26 13:29:29.773 INFO 16252 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-11-26 13:29:29.774 INFO 16252 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 4461 ms
2018-11-26 13:29:29.852 INFO 16252 --- [ main] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-11-26 13:29:29.861 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-11-26 13:29:29.862 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-11-26 13:29:29.862 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'formContentFilter' to: [/*]
2018-11-26 13:29:29.862 INFO 16252 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-11-26 13:29:30.698 INFO 16252 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-11-26 13:29:30.703 WARN 16252 --- [ main] com.zaxxer.hikari.util.DriverDataSource : Registered driver with driverClassName=org.apache.derby.jdbc.EmbeddedDriver was not found, trying direct instantiation.
2018-11-26 13:29:31.587 INFO 16252 --- [ main] com.zaxxer.hikari.pool.PoolBase : HikariPool-1 - Driver does not support get/set network timeout for connections. (Feature not implemented: No details.)
2018-11-26 13:29:31.596 INFO 16252 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2018-11-26 13:29:31.764 INFO 16252 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2018-11-26 13:29:31.925 INFO 16252 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.3.7.Final}
2018-11-26 13:29:31.929 INFO 16252 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-11-26 13:29:32.247 INFO 16252 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.4.Final}
2018-11-26 13:29:32.586 INFO 16252 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.DerbyTenSevenDialect
2018-11-26 13:29:34.603 WARN 16252 --- [ main] o.h.t.s.i.ExceptionHandlerLoggedImpl : GenerationTarget encountered exception accepting command : Error executing DDL "drop table topic" via JDBC Statement
org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL "drop table topic" via JDBC Statement
Caused by: java.sql.SQLSyntaxErrorException: Schema 'SA' does not exist
Caused by: org.apache.derby.iapi.error.StandardException: Schema 'SA' does not exist
2018-11-26 13:29:34.718 INFO 16252 --- [ main] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl#74b00247'
2018-11-26 13:29:34.725 INFO 16252 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-11-26 13:29:36.108 INFO 16252 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2018-11-26 13:29:36.251 WARN 16252 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-11-26 13:29:36.757 INFO 16252 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-11-26 13:29:36.763 INFO 16252 --- [ main] P.ProjectNameWithJpaApplication : Started ProjectNameWithJpaApplication in 12.543 seconds (JVM running for 13.617)
2018-11-26 13:29:42.083 INFO 16252 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2018-11-26 13:29:42.084 INFO 16252 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2018-11-26 13:29:42.100 INFO 16252 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 16 ms
2018-11-26 13:29:42.298 INFO 16252 --- [nio-8080-exec-1] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory
And the pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>PackageNameWithJPA</groupId>
<artifactId>ProjectNameWithJPA</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>ProjectNameWithJPA</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.apache.derby</groupId>
<artifactId>derby</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Project structure:
Thank you in advance for any help.

I have same problem .It is because your Properties default is set to:
"spring.jpa.hibernate.ddl-auto=create-drop"
change it
in application.properties file.if this not over there add this
"spring.jpa.hibernate.ddl-auto=update"
line in your application.properties file.It work fine.

Even I have encountered the same error while using Apache Derby. This is because of the default properties of spring which is -spring.jpa.hibernate.ddl-auto=create-drop.
Solution: Create an application.properties file in src/main/resources folder and change the property to spring.jpa.hibernate.ddl-auto=update and run the app again, it should work.

The reason being the second controller in package "ProjectNameWithJPA.course" is giving 404 error because spring is not able to scan controller in "ProjectNameWithJPA.course".
By default, Spring-Boot scans the controller under the same package hierarchy like it can be "PackageNameWithJPA.course"
Read this for more understanding spring docs [https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-using-springbootapplication-annotation.html]

You can always define a custom component scan in a spring boot project. By default #SpringBootApplication annotation handles the component scanning for the application. However, let’s say one of the components is defined in another package then you can define in your configuration class like :
#ComponentScan({"com.springboot.basics.springbootPA1","com.springboot.springbootPA2"})
#SpringBootApplication
public class testApplication{

Spring Boot RequestMapping not working on Linux Fedora 26

I recently started using Linux Fedora 26 and wanted to start a Spring Boot Application but it won't recognize #Controller and #RestController annotations with Thymeleaf. My HomeController class's mapping doesn't see my Templates folder and I get a Whiteable Error page / 404.
I have started to build a similar project (https://github.com/alexanderphoen1x/trainingdiary) in my old Windows machine and it seemed to work fine, but when I tried running my old project, I cloned it from github and it gives me an Exception:
Error creating bean with name 'requestMappingHandlerMapping' defined in class path resource
[org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed
I think it might be Linux related?
Project structure:
1. greenenergy
-src/main/java
+com.greenenergy
*GreenEnergyApplication.java
+com.greenenergy.controller
*HomeController.java
-src/main/resources
+static
+templates
*stories.html
+application.properties
(...)
-pom.xml
My code:
GreenEnergyApplication.java:
package com.greenenergy;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class GreenEnergyApplication {
public static void main(String[] args) {
SpringApplication.run(GreenEnergyApplication.class, args);
}
}
HomeController.java:
package com.greenergy.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class HomeController {
#RequestMapping("/")
public String stories() {
return "stories";
}
}
stories.html:
<!DOCTYPE html>
<html>
<title></title>
<head></head>
<body>Hey Alex</body>
</html>
pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.greenenergy</groupId>
<artifactId>greenenergy</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>demo</name>
<description>Green energy project</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.6.RELEASE</version>
<relativePath /> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Console:
2018-10-22 17:31:32.580 INFO 5091 --- [ restartedMain] com.greenenergy.GreenEnergyApplication : Starting GreenEnergyApplication on localhost.localdomain with PID 5091 (/home/alexanderp/Projects/greenenergy/greenenergy/target/classes started by alexanderp in /home/alexanderp/Projects/greenenergy/greenenergy)
2018-10-22 17:31:32.581 INFO 5091 --- [ restartedMain] com.greenenergy.GreenEnergyApplication : No active profile set, falling back to default profiles: default
2018-10-22 17:31:32.650 INFO 5091 --- [ restartedMain] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#76dffce0: startup date [Mon Oct 22 17:31:32 CEST 2018]; root of context hierarchy
2018-10-22 17:31:34.411 INFO 5091 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-10-22 17:31:34.438 INFO 5091 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-10-22 17:31:34.439 INFO 5091 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.34
2018-10-22 17:31:34.446 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : Loaded APR based Apache Tomcat Native library [1.2.16] using APR version [1.6.3].
2018-10-22 17:31:34.447 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : APR capabilities: IPv6 [true], sendfile [true], accept filters [false], random [true].
2018-10-22 17:31:34.447 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : APR/OpenSSL configuration: useAprConnector [false], useOpenSSL [true]
2018-10-22 17:31:34.450 INFO 5091 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : OpenSSL successfully initialized [OpenSSL 1.1.0h-fips 27 Mar 2018]
2018-10-22 17:31:34.546 INFO 5091 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-10-22 17:31:34.546 INFO 5091 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1900 ms
2018-10-22 17:31:34.619 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-10-22 17:31:34.623 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-10-22 17:31:34.624 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-10-22 17:31:34.624 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2018-10-22 17:31:34.624 INFO 5091 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-10-22 17:31:34.785 INFO 5091 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-22 17:31:35.027 INFO 5091 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#76dffce0: startup date [Mon Oct 22 17:31:32 CEST 2018]; root of context hierarchy
2018-10-22 17:31:35.117 INFO 5091 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-10-22 17:31:35.119 INFO 5091 --- [ restartedMain] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-10-22 17:31:35.177 INFO 5091 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-22 17:31:35.177 INFO 5091 --- [ restartedMain] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-10-22 17:31:35.425 INFO 5091 --- [ restartedMain] o.s.b.d.a.OptionalLiveReloadServer : LiveReload server is running on port 35729
2018-10-22 17:31:35.453 INFO 5091 --- [ restartedMain] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-10-22 17:31:35.482 INFO 5091 --- [ restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-10-22 17:31:35.487 INFO 5091 --- [ restartedMain] com.greenenergy.GreenEnergyApplication : Started GreenEnergyApplication in 3.246 seconds (JVM running for 4.164)
2018-10-22 17:31:40.437 INFO 5091 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring FrameworkServlet 'dispatcherServlet'
2018-10-22 17:31:40.437 INFO 5091 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization started
2018-10-22 17:31:40.450 INFO 5091 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : FrameworkServlet 'dispatcherServlet': initialization completed in 12 ms
2018-10-22 17:31:48.845 INFO 5091 --- [ Thread-7] ConfigServletWebServerApplicationContext : Closing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#76dffce0: startup date [Mon Oct 22 17:31:32 CEST 2018]; root of context hierarchy
2018-10-22 17:31:48.848 INFO 5091 --- [ Thread-7] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown

The Maven dependency could be corrupted during the download. Comment out the Thymeleaf in the POM and save the project. Delete manually the Thymeleaf files on your drive. Put back the Thymeleaf dependency in the POM and save the Project.

problem with spring boot component scanning

I am writing spring boot application which has two entity classes Teacher and Department. I am using JPA and H2 in-memory database. When i run the application tables are not creating in h2 database. I have specified package to scan using #componentScan annotation but i thinks spring is not finding location of entity classes.
Application class-
package com.H2DatabaseDemo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
#SpringBootApplication
#ComponentScan(basePackages="com.H2DatabaseDemo")
public class H2DatabaseDemoApplication {
public static void main(String[] args) {
SpringApplication.run(H2DatabaseDemoApplication.class, args);
}
}
Aauthor Entity-
package com.H2DatabaseDemo.model;
import java.util.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
#Entity
public class Author {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
private String title;
private String body;
public Author() {}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getBody() {
return body;
}
public void setBody(String body) {
this.body = body;
}
}
Post entity-
package com.H2DatabaseDemo.model;
import java.awt.List;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToOne;
#Entity
public class Post {
#Id
#GeneratedValue(strategy=GenerationType.IDENTITY)
private long id;
private String name;
public Post() {}
public Post(long id, String name) {
this.id = id;
this.name = name;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
Here is my project directory structure
here is my pom.xml file-
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.H2DatabaseDemo</groupId>
<artifactId>H2DatabaseDemo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>H2DatabaseDemo</name>
<description>Demo project for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Stack trace-
:: Spring Boot :: (v2.0.4.RELEASE)
2018-09-13 18:00:07.448 INFO 12584 --- [ main] c.H.H2DatabaseDemoApplication : Starting H2DatabaseDemoApplication on DESKTOP-7NILS0D with PID 12584 (D:\springCourse\H2DatabaseDemo\target\classes started by Mrugesh in D:\springCourse\H2DatabaseDemo)
2018-09-13 18:00:07.453 INFO 12584 --- [ main] c.H.H2DatabaseDemoApplication : No active profile set, falling back to default profiles: default
2018-09-13 18:00:07.539 INFO 12584 --- [ main] ConfigServletWebServerApplicationContext : Refreshing org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#17c1bced: startup date [Thu Sep 13 18:00:07 IST 2018]; root of context hierarchy
2018-09-13 18:00:09.114 INFO 12584 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$934327a5] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-09-13 18:00:09.860 INFO 12584 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-09-13 18:00:09.892 INFO 12584 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-09-13 18:00:09.893 INFO 12584 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.32
2018-09-13 18:00:09.903 INFO 12584 --- [ost-startStop-1] o.a.catalina.core.AprLifecycleListener : The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [C:\Program Files\Java\jre1.8.0_171\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_171/bin/server;C:/Program Files/Java/jre1.8.0_171/bin;C:/Program Files/Java/jre1.8.0_171/lib/amd64;C:\Program Files (x86)\Intel\iCLS Client\;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;C:\Program Files\Intel\iCLS Client\;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;c:\Program Files (x86)\ATI Technologies\ATI.ACE\Core-Static;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files\Intel\Intel(R) Management Engine Components\DAL;C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\Intel\Intel(R) Management Engine Components\IPT;C:\Program Files\nodejs\;C:\WINDOWS\System32\OpenSSH\;C:\Program Files\Git\cmd;C:\Program Files\Microsoft VS Code\bin;C:\Program Files\Microsoft VS Code\bin;C:\Users\Mrugesh\AppData\Roaming\npm;C:\Users\Mrugesh\AppData\Local\Microsoft\WindowsApps;C:\Users\Mrugesh\AppData\Local\GitHubDesktop\bin;C:\eclipse;;.]
2018-09-13 18:00:10.046 INFO 12584 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-09-13 18:00:10.047 INFO 12584 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2516 ms
2018-09-13 18:00:10.173 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-09-13 18:00:10.179 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Servlet webServlet mapped to [/console/]
2018-09-13 18:00:10.188 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/]
2018-09-13 18:00:10.189 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/]
2018-09-13 18:00:10.189 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/]
2018-09-13 18:00:10.189 INFO 12584 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-09-13 18:00:10.392 INFO 12584 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-09-13 18:00:10.667 INFO 12584 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2018-09-13 18:00:10.733 INFO 12584 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2018-09-13 18:00:10.754 INFO 12584 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2018-09-13 18:00:10.863 INFO 12584 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.2.17.Final}
2018-09-13 18:00:10.864 INFO 12584 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2018-09-13 18:00:10.910 INFO 12584 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2018-09-13 18:00:11.034 INFO 12584 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2018-09-13 18:00:11.581 INFO 12584 --- [ main] o.h.t.schema.internal.SchemaCreatorImpl : HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl#6bcc3f27'
2018-09-13 18:00:11.585 INFO 12584 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2018-09-13 18:00:11.700 INFO 12584 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [//favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-13 18:00:12.010 INFO 12584 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.web.servlet.context.AnnotationConfigServletWebServerApplicationContext#17c1bced: startup date [Thu Sep 13 18:00:07 IST 2018]; root of context hierarchy
2018-09-13 18:00:12.060 WARN 12584 --- [ main] aWebConfiguration$JpaWebMvcConfiguration : spring.jpa.open-in-view is enabled by default. Therefore, database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2018-09-13 18:00:12.147 INFO 12584 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity> org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2018-09-13 18:00:12.149 INFO 12584 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.servlet.error.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2018-09-13 18:00:12.183 INFO 12584 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-13 18:00:12.183 INFO 12584 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2018-09-13 18:00:12.558 INFO 12584 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-09-13 18:00:12.560 INFO 12584 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Bean with name 'dataSource' has been autodetected for JMX exposure
2018-09-13 18:00:12.565 INFO 12584 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Located MBean 'dataSource': registering with JMX server as MBean [com.zaxxer.hikari:name=dataSource,type=HikariDataSource]
2018-09-13 18:00:12.605 INFO 12584 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-09-13 18:00:12.610 INFO 12584 --- [ main] c.H.H2DatabaseDemoApplication : Started H2DatabaseDemoApplication in 5.598 seconds (JVM running for 6.203)

Your entities classes are fine but your H2 console is configured with the default db (testdb if i'm not wrong). You should at least specify the URL in your H2 Console to match your db name or the other way around.
You may try the following approach:
1 In the application.properties file configure H2 console access control:
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.datasource.url=jdbc:h2:mem:hddemo-app
2 Access the db from http://localhost:8080/h2-console/
3 Inside the H2 Console, Copy and paste jdbc:h2:mem:hddemo-app in the JDBC URL field. Leave the password field empty and click the connect button.
4 You should see the entity you specified in your project as a table.

Try configurate
hibernate.hbm2ddl.auto
value to be create by adding following line in the application.properties.
spring.jpa.hibernate.ddl-auto=create
I have the same problem so I tried this and it works.
Hope this helps.

In Spring you have two annotations for scanning:
- ComponentScan for scanning Component annotated classes and generating beans out of them (https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/context/annotation/ComponentScan.html), and
- EntityScan for generating information for JPA and others for the entities (https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/autoconfigure/domain/EntityScan.html)
In your case, since you are trying to generate entitites and not beans/components, you should use #EntityScan.
N.B.: Spring also supports auto configuration: https://docs.spring.io/spring-boot/docs/current/reference/html/using-boot-auto-configuration.html

How to access h2-console with a Netbeans Spring-Boot project

I'm using spring boot 1.5.4, i'm following a tutorial where it shows that just by adding h2-console to the localhost:8080/ url you can access the console. But when i do that i have a 404 Whitelabel error.
These are the dependencies
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<!--WebJars-->
<dependency>
<groupId>org.webjars</groupId>
<artifactId>bootstrap</artifactId>
<version>3.3.5</version>
</dependency>
<dependency>
<groupId>org.webjars</groupId>
<artifactId>jquery</artifactId>
<version>3.2.1</version>
</dependency>
<!--jpa and database-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<scope>runtime</scope>
</dependency>
</dependencies>
And this is the spring boot console log
2017-07-19 01:35:25.222 INFO 8644 --- [ main] c.e.s.SpringBootTest00Application : Starting SpringBootTest00Application on DESKTOP-K8Q0B2R with PID 8644 (started by Talon in C:\Users\Talon\Desktop\java netbeans\01\springBootTest00)
2017-07-19 01:35:25.225 INFO 8644 --- [ main] c.e.s.SpringBootTest00Application : No active profile set, falling back to default profiles: default
2017-07-19 01:35:25.544 INFO 8644 --- [ main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#37574691: startup date [Wed Jul 19 01:35:25 CEST 2017]; root of context hierarchy
2017-07-19 01:35:27.236 INFO 8644 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-07-19 01:35:27.248 INFO 8644 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-07-19 01:35:27.249 INFO 8644 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.15
2017-07-19 01:35:27.378 INFO 8644 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-07-19 01:35:27.378 INFO 8644 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1838 ms
2017-07-19 01:35:27.578 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-07-19 01:35:27.582 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-07-19 01:35:27.584 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-07-19 01:35:27.584 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-07-19 01:35:27.584 INFO 8644 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-07-19 01:35:28.020 INFO 8644 --- [ main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2017-07-19 01:35:28.037 INFO 8644 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2017-07-19 01:35:28.122 INFO 8644 --- [ main] org.hibernate.Version : HHH000412: Hibernate Core {5.0.12.Final}
2017-07-19 01:35:28.123 INFO 8644 --- [ main] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2017-07-19 01:35:28.180 INFO 8644 --- [ main] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
2017-07-19 01:35:28.219 INFO 8644 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2017-07-19 01:35:28.321 INFO 8644 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.H2Dialect
2017-07-19 01:35:28.742 INFO 8644 --- [ main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000227: Running hbm2ddl schema export
2017-07-19 01:35:28.757 INFO 8644 --- [ main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000230: Schema export complete
2017-07-19 01:35:28.809 INFO 8644 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2017-07-19 01:35:29.119 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for #ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#37574691: startup date [Wed Jul 19 01:35:25 CEST 2017]; root of context hierarchy
2017-07-19 01:35:29.203 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/]}" onto public java.lang.String com.example.springBootTest00.controllers.IndexController.index()
2017-07-19 01:35:29.205 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product],methods=[POST]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.saveOrUpdateProduct(com.example.springBootTest00.domain.Product)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/edit/{id}]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.edit(java.lang.Integer,org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/new]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.newProduct(org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/delete/{id}]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.deleteProduct(java.lang.Integer,org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/products]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.listProducts(org.springframework.ui.Model)
2017-07-19 01:35:29.206 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/product/{id}]}" onto public java.lang.String com.example.springBootTest00.controllers.ProductController.getProduct(java.lang.Integer,org.springframework.ui.Model)
2017-07-19 01:35:29.209 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest)
2017-07-19 01:35:29.209 INFO 8644 --- [ main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
2017-07-19 01:35:29.243 INFO 8644 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 01:35:29.244 INFO 8644 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 01:35:29.284 INFO 8644 --- [ main] o.s.w.s.handler.SimpleUrlHandlerMapping : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler]
2017-07-19 01:35:29.920 INFO 8644 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2017-07-19 01:35:29.983 INFO 8644 --- [ main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http)
2017-07-19 01:35:29.987 INFO 8644 --- [ main] c.e.s.SpringBootTest00Application : Started SpringBootTest00Application in 5.052 seconds (JVM running for 5.401)
I have some classes with #Service / #Controller working properly and all the requests are mapped to url strings other than h2-console. Should i import something else in the pom or configure something in application.properties ?

Writing in simple Steps:
In Application.properties file include
spring.h2.console.path=/h2
spring.h2.console.enabled=true
And in pom.xml Include devtools dependency
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
re-package and open http://localhost:[port]/h2 you are all set
other properties you have to include is
spring.datasource.url=jdbc:h2:file:~/h2db
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.driver-class-name=org.h2.Driver
the file h2db will store in userprofile folder of windows
for example : C:\Users\[profile]