TransactionManager已经在使用EclipseLink JPA的Spring批处理中定义

Question

必须使用EclipseLink作为我的Spring批处理作业的JPA实现，因为Hibernate缺乏我需要的重要功能。

不幸的是，在与EclipseLink交换Hibernate之后，我在启动批处理jar时得到以下错误:

$ java -jar my-batch.jar
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2021-09-17 15:52:38.387 ERROR 15708 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   :
***************************
APPLICATION FAILED TO START
***************************
Description:
The bean 'transactionManager', defined in class path resource [org/springframework/batch/core/configuration/annotation/SimpleBatchConfiguration.class], could not be registered. A bean with that name has already been defined in class path resource [path/to/my/EclipseLinkJpaConfiguration.class] and overriding is disabled.
Action:
Consider renaming one of the beans or enabling overriding by setting spring.main.allow-bean-definition-overriding=true

在我当前的pom.xml中，你可以看到我的依赖关系，以及我如何用EclipseLink交换Hibernate:

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<version>2.3.12.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>2.3.12.RELEASE</version>
<exclusions>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
</exclusion>
<exclusion>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.batch</groupId>
<artifactId>spring-batch-core</artifactId>
<version>4.2.7.RELEASE>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>org.eclipse.persistence.jpa</artifactId>
<version>2.7.5</version>
</dependency>
</dependencies>

除此之外，我还添加了EclipseLinkJpaConfiguration，这是为了在Spring中使用EclipseLink所必需的:

@Configuration
public class EclipseLinkJpaConfiguration extends JpaBaseConfiguration {
protected EclipseLinkJpaConfiguration(DataSource dataSource,
JpaProperties properties,
ObjectProvider<JtaTransactionManager> jtaTransactionManager) {
super(dataSource, properties, jtaTransactionManager);
}
@Override
protected AbstractJpaVendorAdapter createJpaVendorAdapter() {
return new EclipseLinkJpaVendorAdapter();
}
@Override
protected Map<String, Object> getVendorProperties() {
Map<String, Object> map = new HashMap<>();
map.put(PersistenceUnitProperties.WEAVING, "false");
map.put(PersistenceUnitProperties.LOGGING_LEVEL, SessionLog.FINER_LABEL);
return map;
}
}

我不知道是什么引起的。添加spring.main.allow-bean-definition-overriding=true显然是一个临时的解决方案，但我想解决这个问题。我很感激任何帮助!提前感谢

Answer 1

这是一个已知的问题，请参阅https://github.com/spring-projects/spring-batch/issues/816。该修复计划在5.0版本，计划在2022年第四季度。

同时，您可以允许bean定义重写或将bean重命名为transactionManager以外的其他内容。