springboot, spring boot jpa,class not found exception, Endpointer

Question

**BlogController: **

package com.taskproject.blogproject.controller;

import com.taskproject.blogproject.entities.Blog;
import com.taskproject.blogproject.repositories.BlogRepository;

import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.*;


import java.util.List;

@RestController
@Service
@RequestMapping("/blogs")
public class BlogController {
    private final BlogRepository blogRepository;

    public BlogController(BlogRepository blogRepository) {
        this.blogRepository = blogRepository;
    }


    @PostMapping
    public ResponseEntity<Blog> createBlog(@RequestBody Blog blog) {
        Blog savedBlog = blogRepository.save(blog);
        return ResponseEntity.ok(savedBlog);
    }

    @GetMapping
    public ResponseEntity<List<Blog>> getAllBlogs() {
        List<Blog> blogs = blogRepository.findAll();
        return ResponseEntity.ok(blogs);
    }

    @GetMapping("/{id}")
    public ResponseEntity<Blog> getBlogById(@PathVariable Long id) {
        return blogRepository.findById(id)
                .map(ResponseEntity::ok)
                .orElse(ResponseEntity.notFound().build());
    }

    @PutMapping("/{id}")
    public ResponseEntity<Blog> updateBlog(@PathVariable Long id, @RequestBody Blog updatedBlog) {
        return blogRepository.findById(id)
                .map(blog -> {
                    blog.setTitle(updatedBlog.getTitle());
                    blog.setDescription(updatedBlog.getDescription());
                    Blog savedBlog = blogRepository.save(blog);
                    return ResponseEntity.ok(savedBlog);
                })
                .orElse(ResponseEntity.notFound().build());
    }

    @DeleteMapping("/{id}")
    public ResponseEntity<Void> deleteBlog(@PathVariable Long id) {
        return blogRepository.findById(id)
                .map(blog -> {
                    blogRepository.delete(blog);
                    return ResponseEntity.ok().<Void>build();
                })
                .orElse(ResponseEntity.notFound().build());
    }
}

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>3.2.3</version> <relativePath/> <!-- lookup parent from repository --> </parent> <groupId>com.taskproject</groupId> <artifactId>BlogProject</artifactId> <version>0.0.1-SNAPSHOT</version> <name>BlogProject</name> <description>BlogProject</description> <properties> <java.version>17</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-jpa</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <artifactId>h2</artifactId> <scope>runtime</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>

Application.properties:

spring.datasource.url=jdbc:mysql://localhost:3306/blogs
spring.datasource.username=root
spring.datasource.password=p@sssw0rd
spring.datasource.driver-class-name=com.taskproject.blogproject

spring.jpa.hibernate.ddl-auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL8Dialect


server.port=8080


spring.security.user.name=admin
spring.security.user.password=adminpassword

java.lang.ClassNotFoundException: com.taskproject.blogproject at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641) at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188) at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526) at java.base/java.lang.Class.forName0(Native Method) at java.base/java.lang.Class.forName(Class.java:534) at java.base/java.lang.Class.forName(Class.java:513) at org.springframework.util.ClassUtils.forName(ClassUtils.java:304) at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.driverClassIsLoadable(DataSourceProperties.java:194) at org.springframework.boot.autoconfigure.jdbc.DataSourceProperties.determineDriverClassName(DataSourceProperties.java:175) at org.springframework.boot.autoconfigure.jdbc.PropertiesJdbcConnectionDetails.getDriverClassName(PropertiesJdbcConnectionDetails.java:49) at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration.createDataSource(DataSourceConfiguration.java:55) at org.springframework.boot.autoconfigure.jdbc.DataSourceConfiguration$Hikari.dataSource(DataSourceConfiguration.java:117) at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) at java.base/java.lang.reflect.Method.invoke(Method.java:580) at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:140) at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:647) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:639) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1335) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1165) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:562) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1443) at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1353) at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:907) at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:785) at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:542) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1335) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1165) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:562) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:325) at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:323) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:312) at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1231) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:949) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:624) at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) at org.springframework.boot.SpringApplication.run(SpringApplication.java:334) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1354) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1343) at com.taskproject.blogproject.BlogProjectApplication.main(BlogProjectApplication.java:10)

Answer 1

in Application.properties change

spring.datasource.driver-class-name=com.taskproject.blogproject

to

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver