Question

我正在尝试访问Spring框架中的MySQL数据库，但是我收到以下错误。

***************************
APPLICATION FAILED TO START
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Description:

Parameter 0 of constructor in org.springframework.boot.autoconfigure.orm.jpa.HibernateJpaAutoConfiguration required a bean of type 'javax.sql.DataSource' that could not be found.
    - Bean method 'dataSource' not loaded because @ConditionalOnProperty (spring.datasource.jndi-name) did not find property 'jndi-name'
    - Bean method 'dataSource' not loaded because @ConditionalOnBean (types: org.springframework.boot.jta.XADataSourceWrapper; SearchStrategy: all) did not find any beans


Action:

Consider revisiting the conditions above or defining a bean of type 'javax.sql.DataSource' in your configuration.

这是我的代码：

pom.xml依赖项

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.hibernate</groupId>
            <artifactId>hibernate-entitymanager</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>${mysql.version}</version>
        </dependency>

        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
        </dependency>

        <dependency>
            <groupId>org.thymeleaf.extras</groupId>
            <artifactId>thymeleaf-extras-springsecurity4</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

application.properties

# ===============================
# = DATA SOURCE
# ===============================

# Set here configurations for the database connection
spring.datasource.driverClassName=com.mysql.jdbc.Driver
spring.datasource.url=jdbc.mysql://localhost:3306/geektextdatabase

# Username and password
spring.datasource.username=root
spring.datasource.password=littlegraycells


# Keep the connection alive if idle for a long time (needed in production)
spring.datasource.tomcat.test-while-idle= true
spring.datasource.tomcat.validation-query= SELECT 1


# ===============================
# = JPA / HIBERNATE
# ===============================

# Use spring.jpa.properties.* for Hibernate native properties (the prefix is
# stripped before adding them to the entity manager).

# Show or not log for each sql query
spring.jpa.database=MYSQL
spring.jpa.show-sql=true

# Hibernate ddl auto (create, create-drop, update): with "update" the database
# schema will be automatically updated accordingly to java entities found in
# the project
spring.jpa.hibernate.ddl-auto = update

# Allows Hibernate to generate SQL optimized for a particular DBMS
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

adminportalapplication.java

package com.adminportal;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication
@EnableAutoConfiguration(exclude={DataSourceAutoConfiguration.class})
public class AdminportalApplication {

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

有人可以帮助我，告诉我我错过了什么吗？我错过了任何依赖吗？我使用的是Java 9，我不知道这是否会造成麻烦。

Answer 1

查看错误，有一个Spring配置类HibernateJpaAutoConfiguration（它位于依赖项的类路径中），它依赖于未找到的数据源bean

@Autowired
private DataSource dataSource;

因此，简而言之，您的DataSource bean是定义的吗？如果没有在配置文件中定义（或在AdminportalApplication.java中）

@Bean
public DataSource dataSource() {
return DataSourceBuilder.create().build();
}

阅读more here how to configure a datasource

Answer 2

您没有注册一个名为DataSource的bean，它实际上代表了一个连接到您数据库的bean，您可以在线找到很多教程如何在您的内部设置DataSource bean Spring中的上下文，此处为one。我理解它可能不是最好的例子之一，但正如我所说，网上有很多它们，你可能找到最适合你的那个

Bean方法＆＃39; dataSource＆＃39;没有加载到Spring

2 个答案: