多数据源报错:No qualifying bean of type 'javax.sql.DataSource' available: more than one 'primary' bean found among  candidates: [test2DataSource, test1DataSource]由于之前引入mybatis的时候引入了pom

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

spring会依赖spring-boot-autoconfigure这个jar包
这个jar包中 有个DataSourceAutoConfiguration  会初始化DataSourceInitializer 这个类 ，这个类有一个init方法 会去获取DataSource(数据源)

@Configuration
@ConditionalOnClass({ DataSource.class, EmbeddedDatabaseType.class })
@EnableConfigurationProperties(DataSourceProperties.class)
@Import({ Registrar.class, DataSourcePoolMetadataProvidersConfiguration.class })
public class DataSourceAutoConfiguration {
 
@Configuration
@ConditionalOnMissingBean(DataSourceInitializer.class)
protected static class DataSourceInitializerConfiguration {
 
@Bean
public DataSourceInitializer dataSourceInitializer() {
return new DataSourceInitializer();
}

初始化方法中 会获取数据源 需要初始化一些ddl操作 也是就runSchemaScripts()方法 检查初始化时是否需要执行sql script ,当你有两个数据源的时候，程序不知道取哪一个 ，所以报错

@PostConstruct
public void init() {
if (!this.properties.isInitialize()) {
logger.debug("Initialization disabled (not running DDL scripts)");
      return;
}
if (this.applicationContext.getBeanNamesForType(DataSource.class, false, false).length > 0) {
this.dataSource = this.applicationContext.getBean(DataSource.class);
}
if (this.dataSource == null) {
logger.debug("No DataSource found so not initializing");
      return;
}
   runSchemaScripts();
}
 
private void runSchemaScripts() {
   List<Resource> scripts = getScripts(this.properties.getSchema(), "schema");
   if (!scripts.isEmpty()) {
      runScripts(scripts);
      try {
this.applicationContext.publishEvent(new DataSourceInitializedEvent(
this.dataSource));
// The listener might not be registered yet, so don't rely on it.
if (!this.initialized) {
            runDataScripts();
            this.initialized = true;
}
      }
catch (IllegalStateException ex) {
logger.warn("Could not send event to complete DataSource initialization ("
+ ex.getMessage() + ")");
}
   }
}

解决办法：
如果是xml配置的话 
定义数据源的地方 加个primary="true" 记得只给其中的一个加， 当多数据源时 标示这个数据源是主要的

<bean id="payment-dataSource" class="com.alibaba.druid.pool.DruidDataSource" init-method="init" destroy-method="close" primary="true">

如果是spring boot项目
spring boot 启动类加上 exclude = DataSourceAutoConfiguration.class  代表启动项目的时候 不加载这个类
例子：

@ComponentScan(basePackages = "com.pinyu.system")
@MapperScan("com.pinyu.system.mapper")
@EnableTransactionManagement
@SpringBootApplication(exclude={  
        DataSourceAutoConfiguration.class,  
//        HibernateJpaAutoConfiguration.class, //（如果使用Hibernate时，需要加）  
        DataSourceTransactionManagerAutoConfiguration.class,  
        })
public class Application extends SpringBootServletInitializer {
 
}

原文链接：https://blog.csdn.net/ypp91zr/article/details/84298861