Why isn't my #RequestMapping working on Springboot?

Why isn't my #RequestMapping working on Springboot? - java

I have tried to create a springboot project using spring initilizr in intellij ultimate edition and selected Spring web and Thymeleaf dependencies while making that project. But when I try to add #RequestMapping under the class MainController.java , the #Requestmapping doesn't show up.
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>2.6.7</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo4</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo4</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<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>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
MainController.java
package com.example.demo;
import org.springframework.stereotype.Controller;
#Controller
public class MainController {
#RequestMap
}
Main class :
package com.example.demo;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class Demo4Application {
public static void main(String[] args) {
SpringApplication.run(Demo4Application.class, args);
}
}
Here is the logs if I try to run without #RequestMapping
Java HotSpot(TM) 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.6.7)
2022-05-02 14:31:06.610 INFO 10180 --- [ main] com.example.demo.Demo4Application : Starting Demo4Application using Java 17.0.1 on Mursalin with PID 10180 (D:\JavaFolder\demo4\target\classes started by USER in D:\JavaFolder\demo4)
2022-05-02 14:31:06.610 INFO 10180 --- [ main] com.example.demo.Demo4Application : No active profile set, falling back to 1 default profile: "default"
2022-05-02 14:31:07.296 INFO 10180 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-05-02 14:31:07.312 INFO 10180 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-05-02 14:31:07.312 INFO 10180 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.62]
2022-05-02 14:31:07.405 INFO 10180 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-05-02 14:31:07.421 INFO 10180 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 765 ms
2022-05-02 14:31:07.640 WARN 10180 --- [ main] ion$DefaultTemplateResolverConfiguration : Cannot find template location: classpath:/templates/ (please add some templates or check your Thymeleaf configuration)
2022-05-02 14:31:07.702 INFO 10180 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-05-02 14:31:07.718 INFO 10180 --- [ main] com.example.demo.Demo4Application : Started Demo4Application in 1.708 seconds (JVM running for 2.55)
Here are the file structures :

#RequestMapping is in org.springframework.web.bind.annotation package. So you need to import it
import org.springframework.web.bind.annotation.*;
#RestController
#RequestMapping("/Main")
public class MainController {

Updating to latest version of Intellij solved this problem

Related

Sping Boot basic project not running in Intellij Community Edition Same code runs in STS

I have created a Basic Spring Project with following three files in IntelliJ community Edition.
Starter Class :
package com.learn.spring;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
#SpringBootApplication
public class StarterClass {
public static void main(String[] args) {
SpringApplication.run(StarterClass.class,args);
}
}
Hello.java
package com.learning.spring.hello;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
#RestController
public class Hello {
#RequestMapping("/hello")
public String hi() {
return "Hello How Are you doing in IntelliJ";
}
}
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>org.example</groupId>
<artifactId>SpringProjectIntelliJ28082022</artifactId>
<version>1.0-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.5.14</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<properties>
<maven.compiler.source>8</maven.compiler.source>
<maven.compiler.target>8</maven.compiler.target>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<version>2.5.14</version>
</plugin>
</plugins>
</build>
</project>
When I run the application I get the following in my Console :
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.14)
2022-08-28 15:07:36.980 INFO 9408 --- [ main] com.learn.spring.StarterClass : Starting StarterClass using Java 1.8.0_291 on ******** with PID 9408 (S:\Java_Workspaces\spring\SpringProjectIntelliJ28082022\target\classes started by **** in S:\Java_Workspaces\spring\SpringProjectIntelliJ28082022)
2022-08-28 15:07:36.981 INFO 9408 --- [ main] com.learn.spring.StarterClass : No active profile set, falling back to 1 default profile: "default"
2022-08-28 15:07:37.912 INFO 9408 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2022-08-28 15:07:37.932 INFO 9408 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2022-08-28 15:07:37.932 INFO 9408 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.63]
2022-08-28 15:07:38.084 INFO 9408 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2022-08-28 15:07:38.084 INFO 9408 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1071 ms
2022-08-28 15:07:38.382 INFO 9408 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2022-08-28 15:07:38.382 INFO 9408 --- [ main] com.learn.spring.StarterClass : Started StarterClass in 1.739 seconds (JVM running for 2.04)
2022-08-28 15:08:01.308 INFO 9408 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2022-08-28 15:08:01.308 INFO 9408 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2022-08-28 15:08:01.308 INFO 9408 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 0 ms
but when I open the browser and hit
localhost:8080/hello
I get the error message webpage.
Please guide me on where am i going wrong.

Your Starter and Hello classes are in different packages (com.learn.spring vs com.learning.spring.hello), for Spring to automatically pick up your Hello class it must be in the same package as your Starter.
If the different packages are intended that way, you will need to tell Spring to scan them using ComponentScan annotation:
package com.learn.spring;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;
#SpringBootApplication
#ComponentScan("com.learning.spring")
public class StarterClass {
public static void main(String[] args) {
SpringApplication.run(StarterClass.class,args);
}
}

I'm making a simple aop example and it does not work

I'm new to java and Spring and I'm currently trying to understand aop. I'm trying to implement very simple code with my custom annotation and #After advice and for some reason it does not work, what I expected was to get on the console 1 and the 2 insted I get only 1 do any of you guys know why?
annotation
package Terative.Services;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
#Retention(RetentionPolicy.RUNTIME)
#Target(ElementType.METHOD)
public #interface MyAnnotation {
}
pom
<?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>2.5.2</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>demo</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>11</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</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-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</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>
</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>
psvm
package Terative;
import Terative.Services.Simulation_service;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
#EnableAspectJAutoProxy
#SpringBootApplication
public class DemoApplication {
public static void main(String[] args) {
SpringApplication.run(DemoApplication.class, args);
Simulation_service mm = new Simulation_service();
mm.metoda();
}
}
aspect
package Terative.Services;
import lombok.RequiredArgsConstructor;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Pointcut;
import org.springframework.stereotype.Component;
#RequiredArgsConstructor
#org.springframework.stereotype.Service
#Aspect
#Component
public class Simulation_service {
#Pointcut("#annotation(MyAnnotation)")
public void MyAnnotationMethod() {
}
#MyAnnotation
public void metoda() {
System.out.println("1");
}
#After("MyAnnotationMethod()")
public void metoda2() {
System.out.println("2");
}
}
C:\Users\mtsge\.jdks\azul-13.0.6\bin\java.exe "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3.4\lib\idea_rt.jar=51747:C:\Program Files\JetBrains\IntelliJ IDEA Community Edition 2019.3.4\bin" -Dfile.encoding=UTF-8 -classpath C:\Users\mtsge\OneDrive\Pulpit\j\demo\target\classes;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter-aop\2.5.2\spring-boot-starter-aop-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter\2.5.2\spring-boot-starter-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot\2.5.2\spring-boot-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-autoconfigure\2.5.2\spring-boot-autoconfigure-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter-logging\2.5.2\spring-boot-starter-logging-2.5.2.jar;C:\Users\mtsge\.m2\repository\ch\qos\logback\logback-classic\1.2.3\logback-classic-1.2.3.jar;C:\Users\mtsge\.m2\repository\ch\qos\logback\logback-core\1.2.3\logback-core-1.2.3.jar;C:\Users\mtsge\.m2\repository\org\apache\logging\log4j\log4j-to-slf4j\2.14.1\log4j-to-slf4j-2.14.1.jar;C:\Users\mtsge\.m2\repository\org\apache\logging\log4j\log4j-api\2.14.1\log4j-api-2.14.1.jar;C:\Users\mtsge\.m2\repository\org\slf4j\jul-to-slf4j\1.7.31\jul-to-slf4j-1.7.31.jar;C:\Users\mtsge\.m2\repository\jakarta\annotation\jakarta.annotation-api\1.3.5\jakarta.annotation-api-1.3.5.jar;C:\Users\mtsge\.m2\repository\org\yaml\snakeyaml\1.28\snakeyaml-1.28.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-aop\5.3.8\spring-aop-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-beans\5.3.8\spring-beans-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\aspectj\aspectjweaver\1.9.6\aspectjweaver-1.9.6.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter-data-jpa\2.5.2\spring-boot-starter-data-jpa-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter-jdbc\2.5.2\spring-boot-starter-jdbc-2.5.2.jar;C:\Users\mtsge\.m2\repository\com\zaxxer\HikariCP\4.0.3\HikariCP-4.0.3.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-jdbc\5.3.8\spring-jdbc-5.3.8.jar;C:\Users\mtsge\.m2\repository\jakarta\transaction\jakarta.transaction-api\1.3.3\jakarta.transaction-api-1.3.3.jar;C:\Users\mtsge\.m2\repository\jakarta\persistence\jakarta.persistence-api\2.2.3\jakarta.persistence-api-2.2.3.jar;C:\Users\mtsge\.m2\repository\org\hibernate\hibernate-core\5.4.32.Final\hibernate-core-5.4.32.Final.jar;C:\Users\mtsge\.m2\repository\org\jboss\logging\jboss-logging\3.4.2.Final\jboss-logging-3.4.2.Final.jar;C:\Users\mtsge\.m2\repository\org\javassist\javassist\3.27.0-GA\javassist-3.27.0-GA.jar;C:\Users\mtsge\.m2\repository\net\bytebuddy\byte-buddy\1.10.22\byte-buddy-1.10.22.jar;C:\Users\mtsge\.m2\repository\antlr\antlr\2.7.7\antlr-2.7.7.jar;C:\Users\mtsge\.m2\repository\org\jboss\jandex\2.2.3.Final\jandex-2.2.3.Final.jar;C:\Users\mtsge\.m2\repository\com\fasterxml\classmate\1.5.1\classmate-1.5.1.jar;C:\Users\mtsge\.m2\repository\org\dom4j\dom4j\2.1.3\dom4j-2.1.3.jar;C:\Users\mtsge\.m2\repository\org\hibernate\common\hibernate-commons-annotations\5.1.2.Final\hibernate-commons-annotations-5.1.2.Final.jar;C:\Users\mtsge\.m2\repository\org\glassfish\jaxb\jaxb-runtime\2.3.4\jaxb-runtime-2.3.4.jar;C:\Users\mtsge\.m2\repository\org\glassfish\jaxb\txw2\2.3.4\txw2-2.3.4.jar;C:\Users\mtsge\.m2\repository\com\sun\istack\istack-commons-runtime\3.0.12\istack-commons-runtime-3.0.12.jar;C:\Users\mtsge\.m2\repository\com\sun\activation\jakarta.activation\1.2.2\jakarta.activation-1.2.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\data\spring-data-jpa\2.5.2\spring-data-jpa-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\data\spring-data-commons\2.5.2\spring-data-commons-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-orm\5.3.8\spring-orm-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-context\5.3.8\spring-context-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-tx\5.3.8\spring-tx-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\slf4j\slf4j-api\1.7.31\slf4j-api-1.7.31.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-aspects\5.3.8\spring-aspects-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter-web\2.5.2\spring-boot-starter-web-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter-json\2.5.2\spring-boot-starter-json-2.5.2.jar;C:\Users\mtsge\.m2\repository\com\fasterxml\jackson\core\jackson-databind\2.12.3\jackson-databind-2.12.3.jar;C:\Users\mtsge\.m2\repository\com\fasterxml\jackson\core\jackson-annotations\2.12.3\jackson-annotations-2.12.3.jar;C:\Users\mtsge\.m2\repository\com\fasterxml\jackson\core\jackson-core\2.12.3\jackson-core-2.12.3.jar;C:\Users\mtsge\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jdk8\2.12.3\jackson-datatype-jdk8-2.12.3.jar;C:\Users\mtsge\.m2\repository\com\fasterxml\jackson\datatype\jackson-datatype-jsr310\2.12.3\jackson-datatype-jsr310-2.12.3.jar;C:\Users\mtsge\.m2\repository\com\fasterxml\jackson\module\jackson-module-parameter-names\2.12.3\jackson-module-parameter-names-2.12.3.jar;C:\Users\mtsge\.m2\repository\org\springframework\boot\spring-boot-starter-tomcat\2.5.2\spring-boot-starter-tomcat-2.5.2.jar;C:\Users\mtsge\.m2\repository\org\apache\tomcat\embed\tomcat-embed-core\9.0.48\tomcat-embed-core-9.0.48.jar;C:\Users\mtsge\.m2\repository\org\apache\tomcat\embed\tomcat-embed-el\9.0.48\tomcat-embed-el-9.0.48.jar;C:\Users\mtsge\.m2\repository\org\apache\tomcat\embed\tomcat-embed-websocket\9.0.48\tomcat-embed-websocket-9.0.48.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-web\5.3.8\spring-web-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-webmvc\5.3.8\spring-webmvc-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-expression\5.3.8\spring-expression-5.3.8.jar;C:\Users\mtsge\.m2\repository\mysql\mysql-connector-java\8.0.25\mysql-connector-java-8.0.25.jar;C:\Users\mtsge\.m2\repository\org\projectlombok\lombok\1.18.20\lombok-1.18.20.jar;C:\Users\mtsge\.m2\repository\jakarta\xml\bind\jakarta.xml.bind-api\2.3.3\jakarta.xml.bind-api-2.3.3.jar;C:\Users\mtsge\.m2\repository\jakarta\activation\jakarta.activation-api\1.2.2\jakarta.activation-api-1.2.2.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-core\5.3.8\spring-core-5.3.8.jar;C:\Users\mtsge\.m2\repository\org\springframework\spring-jcl\5.3.8\spring-jcl-5.3.8.jar Terative.DemoApplication
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.5.2)
2021-06-26 16:15:03.432 INFO 8188 --- [ main] Terative.DemoApplication : Starting DemoApplication using Java 13.0.6 on DESKTOP-61G00PJ with PID 8188 (C:\Users\mtsge\OneDrive\Pulpit\j\demo\target\classes started by mtsge in C:\Users\mtsge\OneDrive\Pulpit\j\demo)
2021-06-26 16:15:03.432 INFO 8188 --- [ main] Terative.DemoApplication : No active profile set, falling back to default profiles: default
2021-06-26 16:15:05.764 INFO 8188 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFAULT mode.
2021-06-26 16:15:05.800 INFO 8188 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 11 ms. Found 0 JPA repository interfaces.
2021-06-26 16:15:07.758 INFO 8188 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2021-06-26 16:15:07.779 INFO 8188 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2021-06-26 16:15:07.779 INFO 8188 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.48]
2021-06-26 16:15:08.007 INFO 8188 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2021-06-26 16:15:08.007 INFO 8188 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 4292 ms
2021-06-26 16:15:08.462 INFO 8188 --- [ main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [name: default]
2021-06-26 16:15:08.555 INFO 8188 --- [ main] org.hibernate.Version : HHH000412: Hibernate ORM core version 5.4.32.Final
2021-06-26 16:15:08.801 INFO 8188 --- [ main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.1.2.Final}
2021-06-26 16:15:08.961 INFO 8188 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2021-06-26 16:15:09.603 INFO 8188 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Start completed.
2021-06-26 16:15:09.681 INFO 8188 --- [ main] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL8Dialect
2021-06-26 16:15:10.478 INFO 8188 --- [ main] o.h.e.t.j.p.i.JtaPlatformInitiator : HHH000490: Using JtaPlatform implementation: [org.hibernate.engine.transaction.jta.platform.internal.NoJtaPlatform]
2021-06-26 16:15:10.499 INFO 8188 --- [ main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default'
2021-06-26 16:15:10.612 WARN 8188 --- [ main] JpaBaseConfiguration$JpaWebConfiguration : 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
2021-06-26 16:15:11.930 INFO 8188 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2021-06-26 16:15:11.945 INFO 8188 --- [ main] Terative.DemoApplication : Started DemoApplication in 9.53 seconds (JVM running for 10.837)
1
Process finished with exit code -1

Here you create the instance by your self. Spring can not use any aspect on that as it does not belong to the spring context.
Simulation_service mm = new Simulation_service();
mm.metoda();
You need to retrieve the instance from the spring context. Then invoking the method will cause the aspect to execute.
public static void main(String[] args) {
ApplicationContext context = SpringApplication.run(DemoApplication.class, args);
Simulation_service mm = context.getBean(Simulation_service.class)
mm.metoda();
}
If everything else is fine tuned it will work. In every case what I describe here is a must in order to move forward.

Turns out advice and custom annotation can't be in the same class which is understandable given the reason for which aop was created, I moved method with custom annotation metoda() to another class and marked it ith #Bean annotation

Spring Boot, MySQL, Tomcat can't create intital connections of pool in Eclipse

I have created a webapp using Spring Boot and REST APIs in Eclipse. When I try to run it using Tomcat 8, it gives the error
"o.a.tomcat.jdbc.pool.ConnectionPool: Unable to create initial connections of pool."
I tried using the solutions provided but nothing seemed to work, it always gives the same error.
This is my application.properties file -
spring.datasource.url = jdbc:mysql://localhost:3306/dbase?autoReconnect=true&useSSL=false
spring.datasource.username = 1234
spring.datasource.password = 1234
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect
spring.jpa.hibernate.ddl-auto = update
and this is the pom.xml file -
<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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.springboot</groupId>
<artifactId>springbootrestapi</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>springbootrestapiexample Maven Webapp</name>
<url>http://maven.apache.org</url>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.4.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.11</version>
<scope>test</scope>
</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-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<finalName>springbootrestapiexample</finalName>
</build>
</project>
This is the stack trace -
16:33:43.182 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Included patterns for restart : []
16:33:43.206 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Excluded patterns for restart : [/spring-boot-starter/target/classes/, /spring-boot-autoconfigure/target/classes/, /spring-boot-starter-[\w-]+/, /spring-boot/target/classes/, /spring-boot-actuator/target/classes/, /spring-boot-devtools/target/classes/]
16:33:43.207 [main] DEBUG org.springframework.boot.devtools.restart.ChangeableUrls - Matching URLs for reloading : [file:/C:/Users/Amber%20Bhanarkar/eclipse-workspace/springbootrestapi/target/classes/]
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.4.RELEASE)
2019-05-29 16:33:43.767 INFO 13396 --- [ restartedMain] c.s.s.StudentApplication : Starting StudentApplication on LAPTOP-BV6107FE with PID 13396 (started by Amber Bhanarkar in C:\Users\Amber Bhanarkar\eclipse-workspace\springbootrestapi)
2019-05-29 16:33:43.768 INFO 13396 --- [ restartedMain] c.s.s.StudentApplication : No active profile set, falling back to default profiles: default
2019-05-29 16:33:43.892 INFO 13396 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext#754391d8: startup date [Wed May 29 16:33:43 IST 2019]; root of context hierarchy
2019-05-29 16:33:49.463 INFO 13396 --- [ restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2019-05-29 16:33:49.552 INFO 13396 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2019-05-29 16:33:49.554 INFO 13396 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.15
2019-05-29 16:33:50.076 INFO 13396 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2019-05-29 16:33:50.076 INFO 13396 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 6188 ms
2019-05-29 16:33:50.354 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2019-05-29 16:33:50.359 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2019-05-29 16:33:50.360 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2019-05-29 16:33:50.360 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2019-05-29 16:33:50.360 INFO 13396 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2019-05-29 16:33:55.529 ERROR 13396 --- [ restartedMain] o.a.tomcat.jdbc.pool.ConnectionPool : Unable to create initial connections of pool.
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server. Attempted reconnect 3 times. Giving up.
Here is StudentApplication.java -
package com.springboot.springbootrestapi;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;
#SpringBootApplication
#EnableJpaAuditing
public class StudentApplication {
public static void main(String[] args) {
SpringApplication.run(StudentApplication.class, args);
}
}

You have to change quite few things
1.Goto your mysql installed directory in C drive and find my.ini file.
Change default_authentication_plugin to this
default_authentication_plugin=mysql_native_password
and then goto your MySQL command line client,
After logging in, run this query:
ALTER USER 'yourusername'#'localhost' IDENTIFIED WITH mysql_native_password BY 'yourpassword';
then restart the mysql service and run your program.
replace "yourusername" and "yourpassword" with your actual username and password of MySQL.
Goto POM and replace:
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
with latest MySQL8 connector
<!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.15</version>
</dependency>
i hope it helps :)

These are the things to check
Verify if the database server up and running, and your connection details are working fine in a standalone test.
Grant access if not present, visit :
Host 'xxx.xx.xxx.xxx' is not allowed to connect to this MySQL server
Why are you running spring boot within tomcat in the first place and not as a fat jar ?
Secondly, the mysql client JAR should be included in tomcat library
Increase mySQL max connection count, if server is running out of available connections

Basic controller on Spring boot giving 404

I'm trying to create a basic controller on spring boot but I get:
Whitelabel Error Page
This application has no explicit mapping for /error, so you are seeing
this as a fallback.
Fri Dec 14 21:21:36 ART 2018 There was an unexpected error (type=Not
Found, status=404).
No message available
error. I have the controller in a subpackage of the package where the application is located as it should be.
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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.1.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</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-web</artifactId>
</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>
HomeController.java:
package com.example.demo.home;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#Controller
public class HomeController {
#RequestMapping("/")
public String home(){
return "home";
}
}
DemoApplication.java:
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);
}
}
Console output:
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.1.RELEASE)
2018-12-14 21:16:46.179 INFO 5420 --- [ main] com.example.demo.DemoApplication : Starting DemoApplication on DESKTOP-BMTCH27 with PID 5420 (C:\Users\Usuario\eclipse-workspace\Project\target\classes started by Usuario in C:\Users\Usuario\eclipse-workspace\Project)
2018-12-14 21:16:46.179 INFO 5420 --- [ main] com.example.demo.DemoApplication : No active profile set, falling back to default profiles: default
2018-12-14 21:16:51.395 INFO 5420 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-12-14 21:16:51.433 INFO 5420 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-12-14 21:16:51.433 INFO 5420 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.13
2018-12-14 21:16:51.464 INFO 5420 --- [ 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_192\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files/Java/jre1.8.0_192/bin/server;C:/Program Files/Java/jre1.8.0_192/bin;C:/Program Files/Java/jre1.8.0_192/lib/amd64;C:\Program Files (x86)\Common Files\Oracle\Java\javapath;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 (x86)\Microsoft SQL Server\110\Tools\Binn\;c:\Program Files\Microsoft SQL Server\110\Tools\Binn\;c:\Program Files\Microsoft SQL Server\110\DTS\Binn\;c:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn\ManagementStudio\;c:\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\;C:\Program Files\dotnet\;C:\Program Files\Microsoft SQL Server\130\Tools\Binn\;C:\WINDOWS\System32\OpenSSH\;C:\Users\Usuario\AppData\Local\Microsoft\WindowsApps;;C:\Users\Usuario\Desktop;;.]
2018-12-14 21:16:51.871 INFO 5420 --- [ main] org.apache.jasper.servlet.TldScanner : At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
2018-12-14 21:16:51.871 INFO 5420 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-12-14 21:16:51.871 INFO 5420 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 5489 ms
2018-12-14 21:16:52.449 INFO 5420 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2018-12-14 21:16:52.959 INFO 5420 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8080 (http) with context path ''
2018-12-14 21:16:52.975 INFO 5420 --- [ main] com.example.demo.DemoApplication : Started DemoApplication in 8.155 seconds (JVM running for 9.247)
2018-12-14 21:17:00.448 INFO 5420 --- [nio-8080-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2018-12-14 21:17:00.448 INFO 5420 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2018-12-14 21:17:00.462 INFO 5420 --- [nio-8080-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 13 ms
Folder strucure

It can be from #Controller annotion. Please change it to #RestController
From spring boot documentation https://spring.io/guides/gs/rest-service/
In Spring’s approach to building RESTful web services, HTTP requests are handled by a controller. These components are easily identified by the #RestController annotation, and the GreetingController below handles GET requests for /greeting by returning a new instance of the Greeting class:

#Controller annotation represents the Spring MVC Controller. If you mark your class with #Controller annotation you have to put #ResponseBody on the handler methods.
On the other side, #RestController annotation is a specialized version of #Controller which adds #Controller and #ResponseBody annotation automatically so there is no need to add #ResponseBody to our handler methods.
#RestController
public class HomeController {
#RequestMapping("/")
public String home(){
return "home";
}
}
or
#Controller
public class HomeController {
#RequestMapping("/")
#ResponseBody
public String home(){
return "home";
}
}

For information : If you do not specify any mapping this method will resolve all the http request i.e. you can send GET, POST, HEAD, OPTIONS, PUT, PATCH, DELETE, TRACE request to the specified url and it will be resolved.
For you case, you change just your controller to look like :
package com.example.demo.home;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
#RestController
public class HomeController {
#RequestMapping("/") // Or you can do : #GetMapping("/")
public String home(){
return "home";
}
}
The url:
http://localhost:8080/

For your code/configuration, it will look for the html file under static or webapp folder, meanwhile your home controller should return home.html not home.

Thymeleaf should be included in project's pom.xml as a dependency:
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
Also the home.html file should be moved from templates to static directory.
For more details have a look at Serving Web Content with Spring MVC.

Connecting a container to mysql database and access it

On a linux system:
I am able to start the mysql container running
docker run --name articledb -e MYSQL_ROOT_PASSWORD=root -d mysql:latest
docker ps output afterwards:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
032311fbbba6 mysql:latest "docker-entrypoint.s…" 5 minutes ago Up 5 minutes 3306/tcp, 33060/tcp articledb
Afterwards I try to run a spring boot application which requires the database using
docker run --name articleservice --link articledb:mysql -d articleservice
application.properties
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:mysql://localhost:3306/article
spring.datasource.username=root
spring.datasource.password=root
It seems as it's trying to start but fails on startup. How the service can connect to that database?
error stacktrace
[claus#cls articleservice]$ docker run -t --name articleservice --link articledb:mysql articleservice
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.0.RELEASE)
2018-11-18 11:25:05.487 INFO 1 --- [ main] c.l.a.ArticleServiceApplication : Starting ArticleServiceApplication v0.0.1-SNAPSHOT on f054a8f7553d with PID 1 (/articleservice-0.0.1-SNAPSHOT.jar started by root in /)
2018-11-18 11:25:05.491 INFO 1 --- [ main] c.l.a.ArticleServiceApplication : No active profile set, falling back to default profiles: default
2018-11-18 11:25:06.356 INFO 1 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data repositories in DEFAULT mode.
2018-11-18 11:25:06.424 INFO 1 --- [ main] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 60ms. Found 1 repository interfaces.
2018-11-18 11:25:06.864 INFO 1 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$f0044a11] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2018-11-18 11:25:07.279 INFO 1 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8080 (http)
2018-11-18 11:25:07.314 INFO 1 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2018-11-18 11:25:07.315 INFO 1 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/9.0.12
2018-11-18 11:25:07.326 INFO 1 --- [ 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: [/usr/java/packages/lib:/usr/lib/x86_64-linux-gnu/jni:/lib/x86_64-linux-gnu:/usr/lib/x86_64-linux-gnu:/usr/lib/jni:/lib:/usr/lib]
2018-11-18 11:25:07.411 INFO 1 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2018-11-18 11:25:07.411 INFO 1 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1856 ms
2018-11-18 11:25:07.448 INFO 1 --- [ main] o.s.b.w.servlet.ServletRegistrationBean : Servlet dispatcherServlet mapped to [/]
2018-11-18 11:25:07.451 INFO 1 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2018-11-18 11:25:07.451 INFO 1 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2018-11-18 11:25:07.452 INFO 1 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'formContentFilter' to: [/*]
2018-11-18 11:25:07.452 INFO 1 --- [ main] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2018-11-18 11:25:07.608 INFO 1 --- [ main] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Starting...
2018-11-18 11:25:08.756 ERROR 1 --- [ main] com.zaxxer.hikari.pool.HikariPool : HikariPool-1 - Exception during pool initialization.
com.mysql.cj.jdbc.exceptions.CommunicationsException: Communications link failure
The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
at com.mysql.cj.jdbc.exceptions.SQLError.createCommunicationsException(SQLError.java:174) ~[mysql-connector-java-8.0.13.jar!/:8.0.13]
at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:64) ~[mysql-connector-java-8.0.13.jar!/:8.0.13]
at com.mysql.cj.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:835) ~[mysql-connector-java-8.0.13.jar!/:8.0.13]
at com.mysql.cj.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:455) ~[mysql-connector-java-8.0.13.jar!/:8.0.13]
at com.mysql.cj.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:240) ~[mysql-connector-java-8.0.13.jar!/:8.0.13]
at com.mysql.cj.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:207) ~[mysql-connector-java-8.0.13.jar!/:8.0.13]
at com.zaxxer.hikari.util.DriverDataSource.getConnection(DriverDataSource.java:136) ~[HikariCP-3.2.0.jar!/:na]
at com.zaxxer.hikari.pool.PoolBase.newConnection(PoolBase.java:369) ~[HikariCP-3.2.0.jar!/:na]
at com.zaxxer.hikari.pool.PoolBase.newPoolEntry(PoolBase.java:198) ~[HikariCP-3.2.0.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.createPoolEntry(HikariPool.java:467) ~[HikariCP-3.2.0.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.checkFailFast(HikariPool.java:541) ~[HikariCP-3.2.0.jar!/:na]
at com.zaxxer.hikari.pool.HikariPool.<init>(HikariPool.java:115) ~[HikariCP-3.2.0.jar!/:na]
at com.zaxxer.hikari.HikariDataSource.getConnection(HikariDataSource.java:112) ~[HikariCP-3.2.0.jar!/:na]
at org.springframework.jdbc.datasource.DataSourceUtils.fetchConnection(DataSourceUtils.java:151) ~[spring-jdbc-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.doGetConnection(DataSourceUtils.java:115) ~[spring-jdbc-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.jdbc.datasource.DataSourceUtils.getConnection(DataSourceUtils.java:78) ~[spring-jdbc-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:319) ~[spring-jdbc-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.jdbc.support.JdbcUtils.extractDatabaseMetaData(JdbcUtils.java:356) ~[spring-jdbc-5.1.2.RELEASE.jar!/:5.1.2.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.DatabaseLookup.getDatabase(DatabaseLookup.java:72) ~[spring-boot-autoconfigure-2.1.0.RELEASE.jar!/:2.1.0.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.JpaProperties.determineDatabase(JpaProperties.java:142) ~[spring-boot-autoconfigure-2.1.0.RELEASE.jar!/:2.1.0.RELEASE]
at org.springframework.boot.autoconfigure.orm.jpa.JpaBaseConfiguration.jpaVendorAdapter(JpaBaseConfiguration.java:112) ~[spring-boot-autoconfigure-2.1.0.RELEASE.jar!/:2.1.0.RELEASE]
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.leuphana</groupId>
<artifactId>articleservice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>articleservice</name>
<description>articleservice</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</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-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>27.0-jre</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</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>

Guess I solved it. I did not even had to link the containers, as long as you know the mysql IP. At least this is the way it works for linux:
inspect mysql container running docker inspect mysqlcontainer | grep IP
add the IP of that mysql container to your spring.datasource.url=127.0.0.1:3306/database
run mvn clean, mvn install and build the image.
After doing these steps it should work out.

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Java is a programming language and computing platform first released by Sun Microsystems in 1995.

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#RequestMapping is in org.springframework.web.bind.annotation package. So you need to import it import org.springframework.web.bind.annotation.*; #RestController #RequestMapping("/Main") public class MainController {

Updating to latest version of Intellij solved this problem

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