springboot、spring boot jpa、类未找到异常、Endpointer

问题描述 投票：0回答：1

这是

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());
    }
}

这是

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\> 

##

这是

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

以下是异常描述：

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)
java spring-boot exception classnotfoundexception
1个回答
0
投票

在Application.properties中更改

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

到

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