[英]Making Spring Data JPA work with DataNucleus (GAE) (Spring Boot)
Spring Data可与Google App Engine一起使用的一些提示如下:
许多示例不是“ Spring Boot”,因此我一直在尝试使用它进行改进。 但是,我一直被这个错误困扰着很多天:
[INFO] Caused by: java.lang.NullPointerException
[INFO] at org.datanucleus.api.jpa.metamodel.SingularAttributeImpl.isVersion(SingularAttributeImpl.java:79)
[INFO] at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.findVersionAttribute(JpaMetamodelEntityInformation.java:102)
[INFO] at org.springframework.data.jpa.repository.support.JpaMetamodelEntityInformation.<init>(JpaMetamodelEntityInformation.java:79)
[INFO] at org.springframework.data.jpa.repository.support.JpaEntityInformationSupport.getMetadata(JpaEntityInformationSupport.java:65)
[INFO] at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getEntityInformation(JpaRepositoryFactory.java:149)
[INFO] at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:88)
[INFO] at org.springframework.data.jpa.repository.support.JpaRepositoryFactory.getTargetRepository(JpaRepositoryFactory.java:68)
[INFO] at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:158)
[INFO] at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.initAndReturn(RepositoryFactoryBeanSupport.java:224)
[INFO] at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.afterPropertiesSet(RepositoryFactoryBeanSupport.java:210)
[INFO] at org.springframework.data.jpa.repository.support.JpaRepositoryFactoryBean.afterPropertiesSet(JpaRepositoryFactoryBean.java:92)
[INFO] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$6.run(AbstractAutowireCapableBeanFactory.java:1602)
[INFO] at java.security.AccessController.doPrivileged(Native Method)
[INFO] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1599)
[INFO] at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1549)
[INFO] ... 40 more
在哪里,我尝试将Spring Data JPA与DataNucleus / AppEngine结合使用:
@Configuration
@ComponentScan
@EnableJpaRepositories
@EnableTransactionManagement
class JpaApplicationConfig {
private static final Logger logger = Logger
.getLogger(JpaApplicationConfig.class.getName());
@Bean
public EntityManagerFactory entityManagerFactory() {
logger.info("Loading Entity Manager...");
return Persistence
.createEntityManagerFactory("transactions-optional");
}
@Bean
public PlatformTransactionManager transactionManager() {
logger.info("Loading Transaction Manager...");
final JpaTransactionManager txManager = new JpaTransactionManager();
txManager.setEntityManagerFactory(entityManagerFactory());
return txManager;
}
}
我已经测试了Persistence.createEntityManagerFactory("transactions-optional");
看看应用程序是否可以继续使用此EMF,可以,因此,我确定此EMF可以正常工作。 问题在于Spring Data JPA的“接线”,有人可以帮忙吗?
您是说这个问题http://www.datanucleus.org/servlet/jira/browse/NUCJPA-250,因为这似乎已经很久以前解决了。 显然,您必须获得一个适用于您的JPA提供程序版本的GAE版本。
另一个解决方法是切换回Spring Data 1.3.0。
如果您不想浪费一天配置Spring上下文和依赖项,那么我建议您这样做。
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