創建名為'dataSource'+ Spring Boot + Hibernate的bean時出錯

Question

關於如何訪問mysql數據，我在啟動spring指南時遇到了一些問題（請參閱此鏈接： https ： //spring.io/guides/gs/accessing-data-mysql/ ）。 我稍微調整了類，所以我有這個代碼：

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> 

我正在使用這個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();
    }
}

與此存儲庫一起使用： 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> {

}

而這個實體： 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;
    }
}

最后我有這個Application.class：

@EnableAutoConfiguration
@SpringBootApplication
public class IPbackendApplication {

public static void main(String[] args) {

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

我收到此錯誤：

org.springframework.beans.factory.UnsatisfiedDependencyException：創建名為'org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration'的bean時出錯：通過構造函數參數0表示不滿意的依賴關系; 嵌套異常是org.springframework.beans.factory.BeanCreationException：在類路徑資源中定義名稱為'dataSource'的bean時出錯[org / springframework / boot / autoconfigure / jdbc / DataSourceConfiguration $ Tomcat.class]：通過工廠方法進行Bean實例化失敗; 嵌套異常是org.springframework.beans.BeanInstantiationException：無法實例化[org.apache.tomcat.jdbc.pool.DataSource]：工廠方法'dataSource'引發異常; 嵌套異常是java.lang.IllegalArgumentException：URL必須以org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray（ConstructorResolver.java:749）〜[spring-beans-4.3.10.RELEASE.jar中的'jdbc'開頭：4.3.10.RELEASE] 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]

謝謝你的幫助！

Answer 1

在異常跟蹤中查看此消息：

嵌套異常是org.springframework.beans.BeanInstantiationException：無法實例化[org.apache.tomcat.jdbc.pool.DataSource]：工廠方法'dataSource'引發異常; 嵌套異常是java.lang.IllegalArgumentException： URL必須以org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray（ConstructorResolver.java:749）中的'jdbc'開頭

您很可能不提供值為spring.datasource.url屬性的application.properties文件。
否則你沒有正確評估它。

它應該看起來像：

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

您可以參考Spring Boot文檔 。

Answer 2

在嘗試測試我的dao層時，我收到了非常類似的錯誤。

@RunWith(SpringRunner.class)
@DataJpaTest
public class ItemRepositoryTest {

    @Autowired
    private ItemRepository itemRepository;

    @Test
    public void findAll() {
        List<Item> allItems = itemRepository.findAll();
        Assertions.assertThat(allItems).hasSize(9);
    }
}

通過添加以下內容解決了該問題

@AutoConfigureTestDatabase（替換= AutoConfigureTestDatabase.Replace.NONE）

到測試類：

@RunWith(SpringRunner.class)
@DataJpaTest
@AutoConfigureTestDatabase(replace=AutoConfigureTestDatabase.Replace.NONE)
public class ItemRepositoryTest {...}

Answer 3

您共享的最后一個屬性有一些錯誤需要修復spring.datasource.data-username=myuser和spring.datasource.data-password=ThePassword

這是如何正確配置spring數據源的示例

spring.datasource.url=jdbc:mysql://localhost:3306/mydb
spring.datasource.username=myuser
spring.datasource.password=ThePassword

這是Spring文檔的另一個例子

spring.datasource.url=jdbc:mysql://localhost/test
spring.datasource.username=dbuser
spring.datasource.password=dbpass
spring.datasource.driver-class-name=com.mysql.jdbc.Driver