Develop Reference

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);
}
}

Why isn't my #RequestMapping working on Springboot?

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

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

I got whitelabel error page instead of eureka dashboard

I'm following a tutorial about Eureka to start up a sample eureka server ,I followed exactly the same steps but i get a whitelabel insteed of eureka dashbord, I will share with you all the configuration that I made
the POM.xml
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com..discovery.service</groupId>
<artifactId>descoveryservice</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>descoveryservice</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Finchley.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>${spring-cloud.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>spring-milestones</id>
<name>Spring Milestones</name>
<url>https://repo.spring.io/milestone</url>
</repository>
</repositories>
application.properties :
server.port=8010
spring.application.name=discoveryservice
eureka.client.registerWithEureka=false
eureka.client.fetchRegistry=false
eureka.client.serviceUrl.defaultZone = http://localhost:8010/eureka
and the finally the console :
2020-05-07 16:15:59.358 INFO 21060 --- [ main] o.s.core.annotation.AnnotationUtils : Failed to introspect annotations on class org.springframework.cloud.netflix.eureka.config.EurekaDiscoveryClientConfigServiceBootstrapConfiguration: java.lang.IllegalStateException: Could not obtain annotation attribute value for public abstract java.lang.Class[] org.springframework.boot.autoconfigure.condition.ConditionalOnClass.value()
2020-05-07 16:15:59.679 INFO 21060 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'configurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$97f8ff4f] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.3.RELEASE)
2020-05-07 16:16:01.722 INFO 21060 --- [ main] c.d.s.d.DescoveryserviceApplication : No active profile set, falling back to default profiles: default
2020-05-07 16:16:02.829 WARN 21060 --- [ main] o.s.boot.actuate.endpoint.EndpointId : Endpoint ID 'service-registry' contains invalid characters, please migrate to a valid format.
2020-05-07 16:16:03.242 INFO 21060 --- [ main] o.s.cloud.context.scope.GenericScope : BeanFactory id=889ab658-056e-3973-ba9c-f9fdd0f82c43
2020-05-07 16:16:03.378 INFO 21060 --- [ main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration' of type [org.springframework.cloud.autoconfigure.ConfigurationPropertiesRebinderAutoConfiguration$$EnhancerBySpringCGLIB$$97f8ff4f] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2020-05-07 16:16:04.447 INFO 21060 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat initialized with port(s): 8010 (http)
2020-05-07 16:16:04.491 INFO 21060 --- [ main] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2020-05-07 16:16:04.491 INFO 21060 --- [ main] org.apache.catalina.core.StandardEngine : Starting Servlet engine: [Apache Tomcat/9.0.16]
2020-05-07 16:16:04.509 INFO 21060 --- [ 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\jdk-11.0.6\bin;C:\Windows\Sun\Java\bin;C:\Windows\system32;C:\Windows;C:/Program Files/Java/jdk-11.0.6/bin/server;C:/Program Files/Java/jdk-11.0.6/bin;C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0\;C:\Windows\System32\OpenSSH\;C:\Program Files\Intel\WiFi\bin\;C:\Program Files\Common Files\Intel\WirelessCommon\;C:\Program Files\Git\cmd;;C:\Program Files\Docker\Docker\resources\bin;C:\ProgramData\DockerDesktop\version-bin;C:\Users\novatim\AppData\Local\Microsoft\WindowsApps;C:\Users\novatim\Desktop\apache-maven-3.6.3-bin\apache-maven-3.6.3\bin;C:\Program Files\Java\jdk-11.0.6\bin;;C:\Users\novatim\Desktop\eclipse-jee-2019-12-R-win32-x86_64\eclipse;;.]
2020-05-07 16:16:04.768 INFO 21060 --- [ main] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2020-05-07 16:16:04.768 INFO 21060 --- [ main] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 2996 ms
2020-05-07 16:16:04.935 WARN 21060 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2020-05-07 16:16:04.936 INFO 21060 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2020-05-07 16:16:04.962 INFO 21060 --- [ main] c.netflix.config.DynamicPropertyFactory : DynamicPropertyFactory is initialized with configuration sources: com.netflix.config.ConcurrentCompositeConfiguration#13ed066e
2020-05-07 16:16:06.652 INFO 21060 --- [ main] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname
2020-05-07 16:16:08.337 INFO 21060 --- [ main] o.s.cloud.commons.util.InetUtils : Cannot determine local hostname
2020-05-07 16:16:08.963 WARN 21060 --- [ main] c.n.c.sources.URLConfigurationSource : No URLs will be polled as dynamic configuration sources.
2020-05-07 16:16:08.964 INFO 21060 --- [ main] c.n.c.sources.URLConfigurationSource : To enable URLs as dynamic configuration sources, define System property archaius.configurationSource.additionalUrls or make config.properties available on classpath.
2020-05-07 16:16:09.222 INFO 21060 --- [ main] o.s.s.concurrent.ThreadPoolTaskExecutor : Initializing ExecutorService 'applicationTaskExecutor'
2020-05-07 16:16:10.021 INFO 21060 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 2 endpoint(s) beneath base path '/actuator'
2020-05-07 16:16:10.174 INFO 21060 --- [ main] o.s.c.n.eureka.InstanceInfoFactory : Setting initial instance status as: STARTING
2020-05-07 16:16:10.226 INFO 21060 --- [ main] com.netflix.discovery.DiscoveryClient : Initializing Eureka in region us-east-1
2020-05-07 16:16:10.229 INFO 21060 --- [ main] com.netflix.discovery.DiscoveryClient : Client configured to neither register nor query for data.
2020-05-07 16:16:10.243 INFO 21060 --- [ main] com.netflix.discovery.DiscoveryClient : Discovery Client initialized at timestamp 1588860970242 with initial instances count: 0
2020-05-07 16:16:10.250 INFO 21060 --- [ main] o.s.c.n.e.s.EurekaServiceRegistry : Registering application discoveryservice with eureka with status UP
2020-05-07 16:16:10.326 INFO 21060 --- [ main] o.s.b.w.embedded.tomcat.TomcatWebServer : Tomcat started on port(s): 8010 (http) with context path ''
2020-05-07 16:16:10.333 INFO 21060 --- [ main] c.d.s.d.DescoveryserviceApplication : Started DescoveryserviceApplication in 13.391 seconds (JVM running for 14.094)
2020-05-07 16:16:17.202 INFO 21060 --- [nio-8010-exec-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring DispatcherServlet 'dispatcherServlet'
2020-05-07 16:16:17.204 INFO 21060 --- [nio-8010-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2020-05-07 16:16:17.223 INFO 21060 --- [nio-8010-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 19 ms
I do not know where the problem is it has been several hours that I am looking for a solution, if you have ideas do not hesitate to share them,
Thanks .

I guess you didn't add #EnableEurekaServer annotation to your main app
It should be like this
#SpringBootApplication
#EnableEurekaServer
public class DiscoveryServerApplication {
…
}

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