创建名为“dataSource"的 bean + Spring Boot + Hibernate 时出错 [英] Error creating bean with name 'dataSource' + Spring Boot + Hibernate
问题描述
我在启动有关如何访问 mysql 数据的 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:
I have a few problems starting up the spring guide on how to access mysql data (see this link: https://spring.io/guides/gs/accessing-data-mysql/). I adjusted the classes slightly, so I have this code:
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
I am using this 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: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> {
}
还有这个实体: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;
}
}
最后我有了这个 Application.class:
And finally I have this 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:创建名为org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration"的bean时出错:通过构造函数参数0表达的不满足的依赖；嵌套异常是 org.springframework.beans.factory.BeanCreationException:在类路径资源 [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class] 中定义名称为dataSource"的 bean 创建错误:通过工厂方法的 Bean 实例化失败;嵌套异常是 org.springframework.beans.BeanInstantiationException:无法实例化 [org.apache.tomcat.jdbc.pool.DataSource]:工厂方法 'dataSource' 抛出异常；嵌套异常是 java.lang.IllegalArgumentException: URL must start with 'jdbc'在 org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]在 org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:189) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1193) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalArgumentException: URL must start with 'jdbc' at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:189) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1193) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
感谢您的帮助！
推荐答案
在异常跟踪中查看此消息:
Look at this message in the exception trace :
嵌套异常是org.springframework.beans.BeanInstantiationException: 失败实例化[org.apache.tomcat.jdbc.pool.DataSource]:工厂方法'dataSource' 抛出异常；嵌套异常是java.lang.IllegalArgumentException: URL 必须以 'jdbc' 开头 在org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalArgumentException: URL must start with 'jdbc' at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749)
您很可能没有提供对 spring.datasource.url 属性进行赋值的 application.properties 文件.
否则你没有正确评价它.
You very probably don't provide an application.properties file that values the spring.datasource.url property.
Or else you don't value it correctly.
它应该看起来像:
spring.datasource.url=jdbc:mysql://localhost/mydb
您可以参考Spring Boot 文档.
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