Develop Reference

Spring boot 3.0.1 application not running on tomcat9 external server

When using my Eclipse's Tomcat9 server (v9.0.62), my "application" runs normally.
Once deployed on my production server however (v9.0.43), 404 is returned.
No stacktraces are being logged by Tomcat.
Both servers use OpenJDK17 as JDK.
This problem does not happen when using versions of Spring < 6.
Eclipse console output:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v3.0.1)
2023-01-05T11:07:33.198+01:00 INFO 28395 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication using Java 17.0.5 with PID 28395 (/home/-----/demo/target/classes started by ----- in /home/-----/demo)
2023-01-05T11:07:33.207+01:00 INFO 28395 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to 1 default profile: "default"
2023-01-05T11:07:34.391+01:00 INFO 28395 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8081 (http)
2023-01-05T11:07:34.403+01:00 INFO 28395 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2023-01-05T11:07:34.404+01:00 INFO 28395 --- [ main] o.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/10.1.4]
2023-01-05T11:07:34.530+01:00 INFO 28395 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2023-01-05T11:07:34.532+01:00 INFO 28395 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1263 ms
2023-01-05T11:07:34.889+01:00 INFO 28395 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8081 (http) with context path ''
2023-01-05T11:07:34.895+01:00 INFO 28395 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 2.316 seconds (process running for 2.652)
2023-01-05T11:07:47.016+01:00 INFO 28395 --- [nio-8081-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2023-01-05T11:07:47.016+01:00 INFO 28395 --- [nio-8081-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2023-01-05T11:07:47.017+01:00 INFO 28395 --- [nio-8081-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 1 ms
When building (maven clean install) the war file, still no issue:
[INFO] Scanning for projects...
[INFO]
[INFO] --------------------------< com.example:demo >--------------------------
[INFO] Building demo 0.0.1-SNAPSHOT
[INFO] --------------------------------[ war ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:3.2.0:clean (default-clean) # demo ---
[INFO] Deleting /home/-----/demo/target
[INFO]
[INFO] --- maven-resources-plugin:3.3.0:resources (default-resources) # demo ---
[INFO] Copying 1 resource
[INFO] Copying 0 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.10.1:compile (default-compile) # demo ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 3 source files to /home/-----/demo/target/classes
[INFO]
[INFO] --- maven-resources-plugin:3.3.0:testResources (default-testResources) # demo ---
[INFO] Not copying test resources
[INFO]
[INFO] --- maven-compiler-plugin:3.10.1:testCompile (default-testCompile) # demo ---
[INFO] Not compiling test sources
[INFO]
[INFO] --- maven-surefire-plugin:2.22.2:test (default-test) # demo ---
[INFO] Tests are skipped.
[INFO]
[INFO] --- maven-war-plugin:3.3.2:war (default-war) # demo ---
[INFO] Packaging webapp
[INFO] Assembling webapp [demo] in [/home/-----/demo/target/demo-0.0.1-SNAPSHOT]
[INFO] Processing war project
[INFO] Copying webapp resources [/home/-----/demo/src/main/webapp]
[INFO] Building war: /home/-----/demo/target/demo-0.0.1-SNAPSHOT.war
[INFO]
[INFO] --- spring-boot-maven-plugin:3.0.1:repackage (repackage) # demo ---
[INFO] Replacing main artifact with repackaged archive
[INFO]
[INFO] --- maven-install-plugin:3.0.1:install (default-install) # demo ---
[INFO] Installing /home/-----/demo/pom.xml to /home/--/.m2/repository/com/example/demo/0.0.1-SNAPSHOT/demo-0.0.1-SNAPSHOT.pom
[INFO] Installing /home/-----/demo/target/demo-0.0.1-SNAPSHOT.war to /home/--/.m2/repository/com/example/demo/0.0.1-SNAPSHOT/demo-0.0.1-SNAPSHOT.war
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.232 s
[INFO] Finished at: 2023-01-05T11:09:35+01:00
[INFO] ------------------------------------------------------------------------
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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>3.0.1</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>17</java.version>
<!-- <tomcat.version>9.0.62</tomcat.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-tomcat</artifactId>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Application:
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
}
}
ServletInitializer:
package com.example.demo;
import org.springframework.boot.builder.SpringApplicationBuilder;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
public class ServletInitializer extends SpringBootServletInitializer {
#Override
protected SpringApplicationBuilder configure(SpringApplicationBuilder application) {
return application.sources(DemoApplication.class);
}
}
Controller:
package com.example.demo.ctrl;
import org.springframework.http.MediaType;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;
#Controller
public class MainController {
#GetMapping(value = "/", produces = MediaType.TEXT_PLAIN_VALUE)
public #ResponseBody String getMain() {
return "super";
}
}
Expected (Eclipse's server):
Found (Production server):
To pinpoint the problem (as my project is rather large), I reproduced the issue with a simple app based on Spring Initializr.
I attempted tweaking the pom.xml to no avail.

Spring boot 3 requires at least JDK17 and Tomcat 10 due to the package renaming from javax to jakarta.
Tomcat 9 does not work with jakarta packages which were changes introduced in Spring 6/Spring boot 3.
If you want to stay on Tomcat 9 you will need to downgrade to Spring boot version 2.x.x, any Spring boot 3 version will require Tomcat upgrade to version 10.

how to handle Spring-boot installation errors?

I have just installed today java spring but I came along a lot of problem normally when I start default spring version comes with 2.3.2(old version) I want to set up as 2.7.0.(upgraded)
I arranged upper edition,error sign comes always.Pom.xml file stand like OK but I do not know wheather fine.
I installed org.codehaus... maven 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.0</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>baris</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<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-freemarker</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<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.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>3.0.0</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
maven output:
cd C:\Users\pc\Documents\NetBeansProjects\initbaris; "JAVA_HOME=C:\\Program Files\\Java\\jdk-17.0.1" cmd /c "\"C:\\Program Files\\NetBeans-12.6\\netbeans\\java\\maven\\bin\\mvn.cmd\" -Dexec.vmArgs= \"-Dexec.args=${exec.vmArgs} -classpath %classpath ${exec.mainClass} ${exec.appArgs}\" \"-Dexec.executable=C:\\Program Files\\Java\\jdk-17.0.1\\bin\\java.exe\" -Dexec.mainClass=baris.demo.DemoApplication -Dexec.classpathScope=runtime -DskipTests=true -Dexec.appArgs= \"-Dmaven.ext.class.path=C:\\Program Files\\NetBeans-12.6\\netbeans\\java\\maven-nblib\\netbeans-eventspy.jar\" -Dfile.encoding=UTF-8 org.codehaus.mojo:exec-maven-plugin:3.0.0:exec"
Running NetBeans Compile On Save execution. Phase execution is skipped and output directories of dependency projects (with Compile on Save turned on) will be used instead of their jar artifacts.
[INFO] Scanning for projects...
[INFO]
[INFO] -----------------------------< baris:demo >-----------------------------
[INFO] Building demo 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- exec-maven-plugin:3.0.0:exec (default-cli) # demo ---
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.7.0)
2022-06-19 03:45:20.730 INFO 18280 --- [ main] baris.demo.DemoApplication : Starting DemoApplication using Java 17.0.1 on bz with PID 18280 (C:\Users\pc\Documents\NetBeansProjects\initbaris\target\classes started by pc in C:\Users\pc\Documents\NetBeansProjects\initbaris)
2022-06-19 03:45:20.734 INFO 18280 --- [ main] baris.demo.DemoApplication : No active profile set, falling back to 1 default profile: "default"
2022-06-19 03:45:21.842 INFO 18280 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2022-06-19 03:45:21.867 INFO 18280 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 8 ms. Found 0 JPA repository interfaces.
2022-06-19 03:45:22.972 INFO 18280 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-06-19 03:45:22.988 INFO 18280 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-06-19 03:45:22.989 INFO 18280 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.63]
2022-06-19 03:45:23.199 INFO 18280 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-06-19 03:45:23.200 INFO 18280 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2400 ms
2022-06-19 03:45:23.288 WARN 18280 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'dataSourceScriptDatabaseInitializer' defined in class path resource [org/springframework/boot/autoconfigure/sql/init/DataSourceInitializationConfiguration.class]: Unsatisfied dependency expressed through method 'dataSourceScriptDatabaseInitializer' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Hikari.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [com.zaxxer.hikari.HikariDataSource]: Factory method 'dataSource' threw exception; nested exception is org.springframework.boot.autoconfigure.jdbc.DataSourceProperties$DataSourceBeanCreationException: Failed to determine a suitable driver class
2022-06-19 03:45:23.294 INFO 18280 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2022-06-19 03:45:23.315 INFO 18280 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2022-06-19 03:45:23.348 ERROR 18280 --- [ main] o.s.b.d.LoggingFailureAnalysisReporter :
***************************
APPLICATION FAILED TO START
***************************
Description:
Failed to configure a DataSource: 'url' attribute is not specified and no embedded datasource could be configured.
Reason: Failed to determine a suitable driver class
Action:
Consider the following:
If you want an embedded database (H2, HSQL or Derby), please put it on the classpath.
If you have database settings to be loaded from a particular profile you may need to activate it (no profiles are currently active).
[ERROR] Command execution failed.
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
at org.apache.commons.exec.DefaultExecutor.executeInternal (DefaultExecutor.java:404)
at org.apache.commons.exec.DefaultExecutor.execute (DefaultExecutor.java:166)
at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:982)
at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:929)
at org.codehaus.mojo.exec.ExecMojo.execute (ExecMojo.java:457)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:77)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:568)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 6.250 s
[INFO] Finished at: 2022-06-19T03:45:24+03:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:exec (default-cli) on project demo: Command execution failed.: Process exited with an error: 1 (Exit value: 1) -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

The error you are getting because of the postgresql.
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<scope>runtime</scope>
</dependency>
Comment these line and try to run the code.

Why can't Postman find my Spring REST API?

I created a very basic Spring Boot project with REST APIs. I tried connecting it to my Angular app but it was getting some CORS security error so I switched to Postman. I'm trying to test it using Postman but I keep receiving a 404 not found error on Postman. Why am I not able to connect to my backend and post to tester function?
controller
package controllers;
#RestController
public class Handler {
#PostMapping("/tester/{id}")
public String tester(#PathVariable(value="id")long userid ){
System.out.println("in tester");
System.out.println(userid);
return "succeeded test";
}
}
main
package halloween.contest;
#SpringBootApplication(exclude = {DataSourceAutoConfiguration.class,
SecurityAutoConfiguration.class})
public class ContestApplication {
public static void main(String[] args) {
SpringApplication.run(ContestApplication.class, args);
}
}
application.properties
spring.autoconfigure.exclude=org.springframework.boot.autoconfigure.security.SecurityAutoConfiguration
spring.data.rest.base-path=/
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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.6</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>halloween</groupId>
<artifactId>contest</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>contest</name>
<description>halloween picture contest</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-rest</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<excludes>
<exclude>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</exclude>
</excludes>
</configuration>
</plugin>
</plugins>
</build>
</project>
console
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.6)
2021-10-26 15:44:12.823 INFO 18760 --- [ main] halloween.contest.ContestApplication : Starting ContestApplication using Java 1.8.0_144 on DESKTOP-VB80TS0 with PID 18760 (C:\Users\Sergio Rodríguez\Documents\Halloween\contest\target\classes started by Sergio Rodríguez in C:\Users\Sergio Rodríguez\Documents\Halloween\contest)
2021-10-26 15:44:12.827 INFO 18760 --- [ main] halloween.contest.ContestApplication : No active profile set, falling back to default profiles: default
2021-10-26 15:44:16.013 INFO 18760 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-10-26 15:44:16.043 INFO 18760 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-10-26 15:44:16.043 INFO 18760 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.54]
2021-10-26 15:44:16.310 INFO 18760 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-10-26 15:44:16.310 INFO 18760 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 3372 ms
2021-10-26 15:44:19.326 INFO 18760 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-10-26 15:44:19.342 INFO 18760 --- [ main] halloween.contest.ContestApplication : Started ContestApplication in 7.201 seconds (JVM running for 7.946)
2021-10-26 15:45:45.138 INFO 18760 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2021-10-26 15:45:45.139 INFO 18760 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2021-10-26 15:45:45.157 INFO 18760 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 17 ms
equivalent cURL command
curl --location --request POST 'localhost:8080/tester/69'
Postman

Answering my own question now that I figured it out. It wasn't apparent based on the code I provided but I'll leave my post for future help (wording helps).
the problem was visibility of packages. I had my controller class in a different package from the main class.

To fix the CORS issue, next to #PostMapping("/tester/{id}") add #CrossOrigin(origins = "http://localhost:<port>") where port is the port from which your Angular app is running.
In your target URL, make sure you've included the default Spring Boot port of 8080, e.g. http://localhost:8080/tester/123 and obviously, please double check that you're doing a POST and not a GET.

got a similar problem..then added the below annotations on top of springbootappication where main() exists, then it's working fine for me.
#EnableWebMvc
#ComponentScan("com.*.*")
Also in postman make the below changes...
Disable/uncheck File --> Proxy --> "Use the system proxy"
Disable/uncheck File --> General --> "SSL Certificate Verification"

Does Spring Boot allow loading external configuration from hidden folders?

So, I created an external configuration file named mystoreroom.yml in "/home/ivan/.config/spring-projects" directory, and I tried specifying its location when launching using the following command:
ivan#IVAN-LAPTOP:~/Projects/Java/my-storeroom$ mvn spring-boot:run -D spring-boot.run.arguments=--spring.config.location=/home/ivan/.config/spring-projects/mystoreroom.yml
After doing that I got an error:
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building my-storeroom 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> spring-boot-maven-plugin:2.3.5.RELEASE:run (default-cli) > test-compile # my-storeroom >>>
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:resources (default-resources) # my-storeroom ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] Copying 1 resource
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:compile (default-compile) # my-storeroom ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] --- maven-resources-plugin:3.1.0:testResources (default-testResources) # my-storeroom ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] skip non existing resourceDirectory /home/ivan/Projects/Java/my-storeroom/src/test/resources
[INFO]
[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) # my-storeroom ---
[INFO] Nothing to compile - all classes are up to date
[INFO]
[INFO] <<< spring-boot-maven-plugin:2.3.5.RELEASE:run (default-cli) < test-compile # my-storeroom <<<
[INFO]
[INFO] --- spring-boot-maven-plugin:2.3.5.RELEASE:run (default-cli) # my-storeroom ---
[INFO] Attaching agents: []
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.3.5.RELEASE)
2020-11-04 00:20:55.577 INFO 31741 --- [ main] c.r.mystoreroom.MyStoreroomApplication : Starting MyStoreroomApplication on IVAN-LAPTOP with PID 31741 (/home/ivan/Projects/Java/my-storeroom/target/classes started by ivan in /home/ivan/Projects/Java/my-storeroom)
2020-11-04 00:20:55.580 INFO 31741 --- [ main] c.r.mystoreroom.MyStoreroomApplication : No active profile set, falling back to default profiles: default
2020-11-04 00:20:56.418 INFO 31741 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2020-11-04 00:20:56.427 INFO 31741 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-11-04 00:20:56.427 INFO 31741 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.39]
2020-11-04 00:20:56.478 INFO 31741 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-11-04 00:20:56.478 INFO 31741 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 847 ms
2020-11-04 00:20:56.525 WARN 31741 --- [ main] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'foo' in value "${foo}"
2020-11-04 00:20:56.528 INFO 31741 --- [ main] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2020-11-04 00:20:56.541 INFO 31741 --- [ main] ConditionEvaluationReportLoggingListener :
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-11-04 00:20:56.551 ERROR 31741 --- [ main] o.s.boot.SpringApplication : Application run failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'userController': Injection of autowired dependencies failed; nested exception is java.lang.IllegalArgumentException: Could not resolve placeholder 'foo' in value "${foo}"
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:405) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1420) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) [spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) [spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405) [spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) [spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.3.5.RELEASE.jar:2.3.5.RELEASE]
at com.repeta.mystoreroom.MyStoreroomApplication.main(MyStoreroomApplication.java:10) [classes/:na]
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'foo' in value "${foo}"
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178) ~[spring-core-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) ~[spring-core-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239) ~[spring-core-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210) ~[spring-core-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) ~[spring-context-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:918) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1248) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1227) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:130) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.2.10.RELEASE.jar:5.2.10.RELEASE]
... 18 common frames omitted
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.586 s
[INFO] Finished at: 2020-11-04T00:20:56+02:00
[INFO] Final Memory: 20M/212M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.3.5.RELEASE:run (default-cli) on project my-storeroom: Application finished with exit code: 1 -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
Then I moved mystoreroom.yml to "/home/ivan" directory and tried again:
ivan#IVAN-LAPTOP:~/Projects/Java/my-storeroom$ mvn spring-boot:run -D spring-boot.run.arguments=--spring.config.location=/home/ivan/mystoreroom.yml
This time everything was fine and /foo endpoint successfully printed "bar"
Am I doing something wrong? Or is it suppose to work like that?
Here's the code that I'm using:
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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.repeta</groupId>
<artifactId>my-storeroom</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>my-storeroom</name>
<description>Demo project for Spring Boot</description>
<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-oauth2-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
<exclusions>
<exclusion>
<groupId>org.junit.vintage</groupId>
<artifactId>junit-vintage-engine</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
mystoreroom.yml
spring:
security:
oauth2:
client:
registration:
github:
clientId: <hidden>
clientSecret: <hidden>
foo: bar
UserController.java
package com.repeta.mystoreroom;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class UserController {
#Value("${foo}")
private String foo;
#GetMapping("/foo")
public String foo(){
return foo;
}
}

I think I stumbled across the same problem. In Spring Boot 2.3.4 the "." in the path was not a problem yet. Since 2.3.5 is released, configurations under "hidden" folders are no longer found. In my case these are not external, rather configurations in the classpath as they are found unpackaged while building. In my mixed maven build environment I have "target" and ".target". The last one is causing problems since 2.3.5. Based on your description, I suspect that this is a new bug.
Bug / Issue 23983

Sprint-boot automatically shutting down after starting server

I am trying to create a simple Spring-boot app for practice. However it seems the server starts but then immediately shuts down. This problem has persisted for days and I'm unsure how to fix.
The entire console output I have displayed below. When I check localhost:8080 it shows nothing.
HelloSpringApplication.java
#SpringBootApplication
public class HelloSpringApplication {
public static void main(String[] args) {
SpringApplication.run(HelloSpringApplication.class, args);
}
}
pom.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
console
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.0.0.RELEASE)
2018-03-26 17:34:20.469 INFO 5561 --- [ main] com.example.demo.HelloSpringApplication : Starting HelloSpringApplication on Aarons-MacBook-Pro.local with PID 5561 (/Users/aaron/Documents/workspace-sts-3.9.3.RELEASE/HelloSpringApplication/target/classes started by aaron in /Users/aaron/Documents/workspace-sts-3.9.3.RELEASE/HelloSpringApplication)
2018-03-26 17:34:20.472 INFO 5561 --- [ main] com.example.demo.HelloSpringApplication : No active profile set, falling back to default profiles: default
2018-03-26 17:34:20.512 INFO 5561 --- [ main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext#691a7f8f: startup date [Mon Mar 26 17:34:20 CDT 2018]; root of context hierarchy
2018-03-26 17:34:21.021 INFO 5561 --- [ main] o.s.j.e.a.AnnotationMBeanExporter : Registering beans for JMX exposure on startup
2018-03-26 17:34:21.030 INFO 5561 --- [ main] com.example.demo.HelloSpringApplication : Started HelloSpringApplication in 0.743 seconds (JVM running for 1.141)
2018-03-26 17:34:21.032 INFO 5561 --- [ Thread-2] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext#691a7f8f: startup date [Mon Mar 26 17:34:20 CDT 2018]; root of context hierarchy
2018-03-26 17:34:21.034 INFO 5561 --- [ Thread-2] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown

That output looks similar to the output of using spring-boot-starter not spring-boot-starter-web which has an embedded tomcat server. Ensure that you are using that dependency in your current pom.xml. Then use mvn clean install to ensure the dependencies are installed correctly and then run the spring app with mvn spring-boot:run.
You can initialize a spring project with start.spring.io, this will provide a zip with a pre-configured empty project, don't forget to select Web dependency.

Ensure that the version of spring-boot-starter and spring-boot-web are compatible in the pom.xml

Just run the mvn clean install and mvn spring-boot:run and see if there is any stack trace at console which can help to find the reason.. Moreover verify pom.xml build config as
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>