小贝子编程

Spring Data Gemfire存储java.lang.Class字段



在我的代码中，我有一个通用的"Value" POJO，它包含值本身和它的类:

public class Value<T extends Serializable> implements Serializable {
    private T value;
    private Class<T> type;
    ...
}

我正在使用Spring Data GemFire和Spring Data的"存储库"特性(dao是从接口自动创建的)。当Spring为这个bean创建DAO时，我得到:

FactoryBean threw exception on object creation; nested exception is java.lang.SecurityException: Can not make a java.lang.Class constructor accessible:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'conditionProcessor': Injection of resource dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'globalStatusElementDAO': FactoryBean threw exception on object creation; nested exception is java.lang.SecurityException: Can not make a java.lang.Class constructor accessible
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:307) ~[spring-context-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1185) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:475) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:304) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:300) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:195) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:700) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:760) ~[spring-context-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) ~[spring-context-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:403) ~[spring-web-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) ~[spring-web-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:106) [spring-web-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4973) [tomcat-embed-core-7.0.52.jar:7.0.52]
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5467) [tomcat-embed-core-7.0.52.jar:7.0.52]
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) [tomcat-embed-core-7.0.52.jar:7.0.52]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559) [tomcat-embed-core-7.0.52.jar:7.0.52]
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549) [tomcat-embed-core-7.0.52.jar:7.0.52]
    at java.util.concurrent.FutureTask.run(FutureTask.java:262) [na:1.7.0_51]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) [na:1.7.0_51]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) [na:1.7.0_51]
    at java.lang.Thread.run(Thread.java:744) [na:1.7.0_51]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'globalStatusElementDAO': FactoryBean threw exception on object creation; nested exception is java.lang.SecurityException: Can not make a java.lang.Class constructor accessible
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:151) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.getObjectFromFactoryBean(FactoryBeanRegistrySupport.java:103) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getObjectForBeanInstance(AbstractBeanFactory.java:1514) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.autowireResource(CommonAnnotationBeanPostProcessor.java:445) ~[spring-context-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.getResource(CommonAnnotationBeanPostProcessor.java:419) ~[spring-context-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor$ResourceElement.getResourceToInject(CommonAnnotationBeanPostProcessor.java:544) ~[spring-context-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata$InjectedElement.inject(InjectionMetadata.java:155) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.context.annotation.CommonAnnotationBeanPostProcessor.postProcessPropertyValues(CommonAnnotationBeanPostProcessor.java:304) ~[spring-context-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    ... 22 common frames omitted
Caused by: java.lang.SecurityException: Can not make a java.lang.Class constructor accessible
    at java.lang.reflect.AccessibleObject.setAccessible0(AccessibleObject.java:139) ~[na:1.7.0_51]
    at java.lang.reflect.AccessibleObject.setAccessible(AccessibleObject.java:129) ~[na:1.7.0_51]
    at org.springframework.util.ReflectionUtils.makeAccessible(ReflectionUtils.java:444) ~[spring-core-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.data.mapping.PreferredConstructor.<init>(PreferredConstructor.java:57) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.model.PreferredConstructorDiscoverer.buildPreferredConstructor(PreferredConstructorDiscoverer.java:106) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.model.PreferredConstructorDiscoverer.<init>(PreferredConstructorDiscoverer.java:74) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.model.BasicPersistentEntity.<init>(BasicPersistentEntity.java:79) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.model.BasicPersistentEntity.<init>(BasicPersistentEntity.java:62) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.gemfire.mapping.GemfirePersistentEntity.<init>(GemfirePersistentEntity.java:40) ~[spring-data-gemfire-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.data.gemfire.mapping.GemfireMappingContext.createPersistentEntity(GemfireMappingContext.java:38) ~[spring-data-gemfire-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.data.gemfire.mapping.GemfireMappingContext.createPersistentEntity(GemfireMappingContext.java:29) ~[spring-data-gemfire-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:246) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.context.AbstractMappingContext$PersistentPropertyCreator.doWith(AbstractMappingContext.java:398) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.util.ReflectionUtils.doWithFields(ReflectionUtils.java:579) ~[spring-core-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    at org.springframework.data.mapping.context.AbstractMappingContext.addPersistentEntity(AbstractMappingContext.java:260) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:171) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:140) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.mapping.context.AbstractMappingContext.getPersistentEntity(AbstractMappingContext.java:66) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.gemfire.repository.support.GemfireRepositoryFactory.getEntityInformation(GemfireRepositoryFactory.java:81) ~[spring-data-gemfire-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.data.gemfire.repository.support.GemfireRepositoryFactory.getTargetRepository(GemfireRepositoryFactory.java:97) ~[spring-data-gemfire-1.3.3.RELEASE.jar:1.3.3.RELEASE]
    at org.springframework.data.repository.core.support.RepositoryFactorySupport.getRepository(RepositoryFactorySupport.java:136) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:153) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.data.repository.core.support.RepositoryFactoryBeanSupport.getObject(RepositoryFactoryBeanSupport.java:43) ~[spring-data-commons-1.5.3.RELEASE.jar:na]
    at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.doGetObjectFromFactoryBean(FactoryBeanRegistrySupport.java:144) ~[spring-beans-4.0.2.RELEASE.jar:4.0.2.RELEASE]
    ... 32 common frames omitted

我如何在GemFire中存储java.lang.Class与Spring数据?

乌利希期刊指南: 

public interface GlobalStatusElementDAO
  extends CrudRepository<GlobalStatusElement, String>
{
}
@Region("xxx")
public class GlobalStatusElement<T extends Serializable>
  extends Value<T>
{
  public GlobalStatusElement( final Class<T> type )
  {
    super( type );
  }
}

类对象通常不允许通过反射进行序列化。简单地存储完整的类名，并在需要时根据类名实例化类对象，这要容易得多。

你可以通过改变你的Value类来存储类名作为String而不是类对象，或者通过改变Value被序列化的方式来实现这一点。

对于第二个选项，这可以通过让Value实现DataSerializable来完成，或者通过为Value注册DataSerializer

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