[Spring] NoUniqueBeanDefinitionException

▣ 에러로그

[2020/06/17 11:42:06.012][http-apr-31883-exec-3][ERROR][AbstractStep:225] Encountered an error executing step SomethingJobStep in job SomethingJob
org.springframework.beans.factory.NoUniqueBeanDefinitionException: No qualifying bean of type [org.springframework.transaction.PlatformTransactionManager] is defined: expected single matching bean but found 2: transactionManager,resourcelessTransactionManager
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBean(DefaultListableBeanFactory.java:365) ~[spring-beans-4.1.7.RELEASE.jar:4.1.7.RELEASE]

▣ 문제원인

• PlatformTransactionManager를 bean 으로 2개 이상 등록한 경우 실제 어떤 bean을 선택해서 서비스해야할지 판단하기 어려운 케이스입니다.

@Bean
public PlatformTransactionManager transactionManager(DataSource masterDataSource) {
    DataSourceTransactionManager transactionManager = new DataSourceTransactionManager(masterDataSource);
    transactionManager.setGlobalRollbackOnParticipationFailure(false);
    return transactionManager;
}

@Bean
public ResourcelessTransactionManager resourcelessTransactionManager() {
    ResourcelessTransactionManager resourcelessTransactionManager = new ResourcelessTransactionManager();
    return resourcelessTransactionManager;
}

▣ 해결방안

1. 명시적으로 @Transactional 에 이름을 명시합니다.

@Transactional("transactionManager")
public void someMethod() {

}

2. @Primary 를 통해서 특정 Bean을 Default Bean으로 설정합니다.

@Bean
@Primary
public PlatformTransactionManager transactionManager(DataSource masterDataSource) {
    DataSourceTransactionManager transactionManager = new DataSourceTransactionManager(masterDataSource);
    transactionManager.setGlobalRollbackOnParticipationFailure(false);
    return transactionManager;
}