创建名为'dataSource'+ Spring Boot + Hibernate的bean时出错

Question

关于如何访问mysql数据,我在启动spring指南时遇到了一些问题(请参阅此链接:https://spring.io/guides/gs/accessing-data-mysql/).我稍微调整了类,所以我有这个代码:

1. 的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.springframework</groupId>
       <artifactId>gs-mysql-data</artifactId>
       <version>0.1.0</version>
   
       <parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>1.5.6.RELEASE</version>
   </parent>
   
   <dependencies>
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-web</artifactId>
   </dependency>
   
   <!-- JPA Data (We are going to use Repositories, Entities, Hibernate, etc...) -->
   
   <dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-data-jpa</artifactId>
   </dependency>
   
   <!-- Use MySQL Connector-J -->
   
   <dependency>
       <groupId>mysql</groupId>
       <artifactId>mysql-connector-java</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-jdbc</artifactId>
   </dependency>
   </dependencies>
   
   <properties>
       <java.version>1.8</java.version>
   </properties>
   
   <build>
   <plugins>
       <plugin>
           <groupId>org.springframework.boot</groupId>
           <artifactId>spring-boot-maven-plugin</artifactId>
       </plugin>
   </plugins>
   </build>
   

我正在使用这个mainController: MainController.java

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import com.resource.iPbackend.UserRepository;
import com.resource.iPbackend.User;

@Controller
@RequestMapping(path = "/main")
public class MainController {

    @Autowired
    private UserRepository userRepository;

    @RequestMapping(path = "/reg", method = RequestMethod.POST)
    public @ResponseBody String regNewUser (@RequestParam String firstName,      @RequestParam String lastName, @RequestParam String email, @RequestParam String password, @RequestParam String username) {
        User n = new User();
        n.setFirstName(firstName);
        n.setLastName(lastName);
        n.setEmail(email);
        n.setPassword(password);
        n.setUsername(username);
        userRepository.save(n);
        return "User is stored in database: " + n;
    }

    @GetMapping(path = "/all")
    public @ResponseBody Iterable<User> getAllUsers() {
        return userRepository.findAll();
    }
}

与此存储库一起使用: UserRepository.java

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;
import com.resource.iPbackend.User;


@Repository
public interface UserRepository extends CrudRepository<User, Long> {

}

而这个实体: User.java

import org.springframework.data.annotation.Id;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
@Entity
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;
    private String firstName;
    private String lastName;
    private String email;
    private String password;
    private String username;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }
}

最后我有这个Application.class:

@EnableAutoConfiguration
@SpringBootApplication
public class IPbackendApplication {

public static void main(String[] args) {

    SpringApplication.run(IPbackendApplication.class, args);
}
}

我收到此错误:

org.springframework.beans.factory.UnsatisfiedDependencyException:错误创建名为"org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration"豆:不满意的依赖,通过构造函数的参数0表示; 嵌套的例外是org.springframework.beans.factory.BeanCreationException:错误创建在类路径资源定义名称"数据源"豆[组织/ springframework的的/ boot /自动配置/ JDBC/DataSourceConfiguration $ Tomcat.class]:通过工厂方法实例化Bean的失败; 嵌套异常是org.springframework.beans.BeanInstantiationException:无法实例化[org.apache.tomcat.jdbc.pool.DataSource]:工厂方法'dataSource'引发异常; 嵌套异常是java.lang.IllegalArgumentException异常:URL必须在org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)与 'JDBC' 启动〜[弹簧豆-4.3.10.RELEASE.jar :4.3.10.RELEASE]在org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:189)〜[弹簧豆-4.3.10.RELEASE.jar:4.3.10.RELEASE]在有机.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1193)〜[弹簧豆-4.3.10.RELEASE.jar:4.3.10.RELEASE]

谢谢你的帮助!

Answer 1

在异常跟踪中查看此消息:

嵌套异常是org.springframework.beans.BeanInstantiationException:无法实例化[org.apache.tomcat.jdbc.pool.DataSource]:工厂方法'dataSource'引发异常; 嵌套异常是java.lang.IllegalArgumentException:URL必须以org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)中的'jdbc'开头

您很可能不提供application.properties值该spring.datasource.url属性的文件.
否则你没有正确评估它.

它应该看起来像:

spring.datasource.url=jdbc:mysql://localhost/mydb

您可以参考Spring Boot文档.