Springboot没有[javax.sql.DataSource]类型的限定bean

Question

我正在尝试将application.properties用于bean数据源,但似乎spring boot没有找到该文件或类似的东西.

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [javax.sql.DataSource] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {}

我的结构在这里:

 .
??? build.gradle
??? src
    ??? main
        ??? java
        ?   ??? com
        ?       ??? companies
        ?           ??? CompanyApplication.java
        ?           ??? config
        ?           ?   ??? WebMvcConfig.java
        ?           ??? controller
        ?           ?   ??? HelloWorldController.java
        ?           ??? model
        ?               ??? Article.java
        ?               ??? daoInterface
        ?               ?   ??? ArticleDaoInterface.java
        ?               ??? daoTemplates
        ?               ?   ??? ArticleDao.java
        ?               ??? mappers
        ?                   ??? ArticleMapper.java
        ??? resources
        ?   ??? application.properties
        ??? webapp
            ??? WEB-INF
                ??? pages
                    ??? hello.jsp

我试图将application.properties文件从资源移动到配置,什么都没有. application.properties:

spring.datasource.driver-class-name=com.mysql.jdbc.Driver
spring.datasource.url=jdbc:mysql://127.0.0.1:3306/name
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver

build.gradle

buildscript {
        repositories {
            //Required repos
            mavenCentral()
            maven { url "http://repo.spring.io/snapshot" }
            maven { url "http://repo.spring.io/milestone" }
        }
        dependencies {
            //Required dependency for spring-boot plugin
            classpath "org.springframework.boot:spring-boot-gradle-plugin:1.2.6.RELEASE"
        }
    }

    apply plugin: 'java'
    apply plugin: 'war'
    apply plugin: 'spring-boot'

    jar {
        baseName = 'companies'
        version = '0.2'
    }

    war {
        baseName = 'companies'
        version =  '0.1'
    }

    sourceCompatibility = 1.8
    targetCompatibility = 1.8

    repositories {
        mavenCentral()
        maven { url "http://repo.spring.io/snapshot" }
        maven { url "http://repo.spring.io/milestone" }
    }

    dependencies {
        compile 'org.springframework.boot:spring-boot-starter-web'
        compile("org.springframework.boot:spring-boot-starter")
        compile("org.springframework:spring-jdbc")
        compile('org.springframework.boot:spring-boot-starter-jdbc:1.2.6.RELEASE')
        testCompile("junit:junit")
        //Required dependency for JSP
        compile 'org.apache.tomcat.embed:tomcat-embed-jasper'
    }

我正在尝试自动装配dataSource:

package com.companies.model.daoTemplates;

import com.companies.model.Article;
import com.companies.model.daoInterface.ArticleDaoInterface;
import com.companies.model.mappers.ArticleMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.JdbcTemplate;
import org.springframework.stereotype.Repository;

import javax.sql.DataSource;
import java.util.List;

@Repository
public class ArticleDao implements ArticleDaoInterface {

    private JdbcTemplate jdbcTemplateObject;

    private final String DB_NAME = "articles";

    @Override
    @Autowired
    public void setDataSource(DataSource ds) {
        this.jdbcTemplateObject = new JdbcTemplate(ds);
    }

    @Override
    public List<Article> listArticle() {
        String SQL = "select * from " + DB_NAME + " where inactive = false ORDER BY name";
        List <Article> article = jdbcTemplateObject.query(SQL,
                new ArticleMapper());
        return article;
    }

}

CompanyApplication.java

package com.companies;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class CompanyApplication {

    public static void main(String[] args) {
        SpringApplication.run(CompanyApplication.class, args);
    }

}

我无法找到我失败的地方.

Answer 1

作为@M.Deinum在他的评论中提到它似乎是一个依赖配置问题.您需要依赖spring-jdbc才能自动配置嵌入式数据库.

请确保您已按照 文档进行操作

您还应该查看这个spring-boot-jdb示例

Answer 2

Spring boot主要基于这样的原理：将特定的jar放入类路径中将触发相关功能的激活。Spring Boot 在启动时扫描类路径，并将启动“他找到的所有内容”，除非您通过使用注释禁用它。

因此，要让 Spring Boot 初始化数据源，您必须具有以下依赖项之一： - spring-boot-starter-jdbc ：将允许使用数据源和 JDBC 内容。- spring-boot-starter-data-jpa ：将加载 JPA 和 DataSource 作为子模块

Answer 3

我遇到了类似的错误，我通过添加以下依赖项解决了它

<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-jpa -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
    <version>2.5.0</version>
</dependency>