在 jsf 2 中的 applicationscope bean 中初始化 jpa entitymanagerfactory

【问题标题】：initializing jpa entitymanagerfactory in applicationscope bean in jsf 2在 jsf 2 中的 applicationscope bean 中初始化 jpa entitymanagerfactory
【发布时间】：2013-03-17 06:33:13
【问题描述】：

这是我在stackoverflow上的第一篇文章

我想在 jsf 2 的 ApplicationScope bean 中创建 EntityManagerFactory。 这是我的豆子

@ApplicationScoped
@ManagedBean(eager = true)

public class ApplicationContext implements Serializable{

/**
 * 
 */
private static final long serialVersionUID = 1L;
private EntityManagerFactory entityManagerFactory = null;
private EntityManager entityManager = null;

public ApplicationContext(){

}

public EntityManagerFactory getEntityManagerFactory() {
    return entityManagerFactory;
}

public void setEntityManagerFactory(EntityManagerFactory entityManagerFactory) {
    this.entityManagerFactory = entityManagerFactory;
}

public EntityManager getEntityManager() {
    return entityManager;
}

public void setEntityManager(EntityManager entityManager) {
    this.entityManager = entityManager;
}

@PostConstruct
public void applicationInitialized(){
    System.out.println("application is being initialized");
    this.entityManagerFactory = Persistence.createEntityManagerFactory("PersonalProject");
    this.entityManager = this.entityManagerFactory.createEntityManager();
}

@PreDestroy
public void applicationDestroyed(){
    System.out.println("application being destroyed");

}

}

我得到了一个巨大的异常堆栈跟踪。

  com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection on managed bean applicationContext
    at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:229)
    at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:105)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:256)
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:255)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4779)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5273)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.faces.spi.InjectionProviderException
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:119)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokePostConstruct(WebContainerInjectionProvider.java:99)
    at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:223)
    ... 15 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:117)
    ... 17 more
Caused by: Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: WebappClassLoader
  context: /PersonalProject
  delegate: false
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@6d4c1103

Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [PersonalProject] failed.
Internal Exception: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:126)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:136)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:65)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60)
    at com.justme.web.gui.ApplicationContext.applicationInitialized(ApplicationContext.java:49)
    ... 22 more
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [PersonalProject] failed.
Internal Exception: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1014)
    at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:88)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:127)
    ... 26 more
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [PersonalProject] failed.
Internal Exception: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
    ... 29 more
Caused by: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.exceptions.ValidationException.invalidTypeForSerializedAttribute(ValidationException.java:1112)
    at org.eclipse.persistence.internal.jpa.metadata.converters.SerializedMetadata.process(SerializedMetadata.java:86)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processSerialized(MappingAccessor.java:1641)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processJPAConverters(MappingAccessor.java:1433)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processMappingConverter(MappingAccessor.java:1495)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processMappingValueConverter(MappingAccessor.java:1513)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.BasicAccessor.process(BasicAccessor.java:367)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor.processAccessors(MetadataDescriptor.java:1365)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.processAccessors(ClassAccessor.java:963)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processAccessors(EntityAccessor.java:876)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.process(EntityAccessor.java:691)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage2(MetadataProject.java:1531)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:474)
    at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:441)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:968)
    ... 28 more
Mar 17, 2013 11:40:24 AM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener
java.lang.RuntimeException: com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection on managed bean applicationContext
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:292)
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4779)
    at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5273)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1566)
    at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1556)
    at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
    at java.util.concurrent.FutureTask.run(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.faces.mgbean.ManagedBeanCreationException: An error occurred performing resource injection on managed bean applicationContext
    at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:229)
    at com.sun.faces.mgbean.BeanBuilder.build(BeanBuilder.java:105)
    at com.sun.faces.mgbean.BeanManager.createAndPush(BeanManager.java:409)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:269)
    at com.sun.faces.mgbean.BeanManager.create(BeanManager.java:256)
    at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:255)
    ... 10 more
Caused by: com.sun.faces.spi.InjectionProviderException
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:119)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokePostConstruct(WebContainerInjectionProvider.java:99)
    at com.sun.faces.mgbean.BeanBuilder.invokePostConstruct(BeanBuilder.java:223)
    ... 15 more
Caused by: java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.sun.faces.vendor.WebContainerInjectionProvider.invokeAnnotatedMethod(WebContainerInjectionProvider.java:117)
    ... 17 more
Caused by: Exception [EclipseLink-30005] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.PersistenceUnitLoadingException
Exception Description: An exception was thrown while searching for persistence archives with ClassLoader: WebappClassLoader
  context: /PersonalProject
  delegate: false
  repositories:
    /WEB-INF/classes/
----------> Parent Classloader:
org.apache.catalina.loader.StandardClassLoader@6d4c1103

Internal Exception: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [PersonalProject] failed.
Internal Exception: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.exceptions.PersistenceUnitLoadingException.exceptionSearchingForPersistenceResources(PersistenceUnitLoadingException.java:126)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:136)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:65)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83)
    at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60)
    at com.justme.web.gui.ApplicationContext.applicationInitialized(ApplicationContext.java:49)
    ... 22 more
Caused by: javax.persistence.PersistenceException: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [PersonalProject] failed.
Internal Exception: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:1014)
    at org.eclipse.persistence.internal.jpa.deployment.JPAInitializer.callPredeploy(JPAInitializer.java:88)
    at org.eclipse.persistence.jpa.PersistenceProvider.createEntityManagerFactory(PersistenceProvider.java:127)
    ... 26 more
Caused by: Exception [EclipseLink-28018] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.EntityManagerSetupException
Exception Description: Predeployment of PersistenceUnit [PersonalProject] failed.
Internal Exception: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.exceptions.EntityManagerSetupException.predeployFailed(EntityManagerSetupException.java:210)
    ... 29 more
Caused by: Exception [EclipseLink-7155] (Eclipse Persistence Services - 2.1.3.v20110304-r9073): org.eclipse.persistence.exceptions.ValidationException
Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.
    at org.eclipse.persistence.exceptions.ValidationException.invalidTypeForSerializedAttribute(ValidationException.java:1112)
    at org.eclipse.persistence.internal.jpa.metadata.converters.SerializedMetadata.process(SerializedMetadata.java:86)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processSerialized(MappingAccessor.java:1641)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processJPAConverters(MappingAccessor.java:1433)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processMappingConverter(MappingAccessor.java:1495)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.MappingAccessor.processMappingValueConverter(MappingAccessor.java:1513)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.mappings.BasicAccessor.process(BasicAccessor.java:367)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataDescriptor.processAccessors(MetadataDescriptor.java:1365)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.ClassAccessor.processAccessors(ClassAccessor.java:963)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.processAccessors(EntityAccessor.java:876)
    at org.eclipse.persistence.internal.jpa.metadata.accessors.classes.EntityAccessor.process(EntityAccessor.java:691)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProject.processStage2(MetadataProject.java:1531)
    at org.eclipse.persistence.internal.jpa.metadata.MetadataProcessor.processORMMetadata(MetadataProcessor.java:474)
    at org.eclipse.persistence.internal.jpa.deployment.PersistenceUnitProcessor.processORMetadata(PersistenceUnitProcessor.java:441)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.predeploy(EntityManagerSetupImpl.java:968)
    ... 28 more

根本原因是因为 Post 类没有实现可序列化。 但它已经实现如下。

public class Post implements Serializable {}

我仅在 ApplicationScoped ManagedBean 中遇到此问题。 如果我尝试使用 ServletContextListener 创建 EntityManagerFactory，那么它的创建就很好了。

可能是什么问题？ 我是否缺少有关 ApplicationScoped bean 的一些知识？

【问题讨论】：

    标签： jsf-2 persistence jpa-2.0 managed-bean servletcontextlistener


    【解决方案1】：

    看起来 Post 类有一个名为 content 的 Object 类型的字段：

    Exception Description: The type [class java.lang.Object] for the attribute [content] on the entity class [class com.justme.model.entities.Post] is not a valid type for a serialized mapping. The attribute type must implement the Serializable interface.

    JPA 不知道如何将 Object 转换为数据库中的列类型。

    还有一件事。您正在使用 EntityManager 作为 ApplicationContext 中的字段。 EntityManager 类不是线程保存类，因此在应用程序范围的类中使用它会导致很多问题。

    你最好去掉EntityManager字段，去掉setEntityManager方法，重写getEntityManager

    public EntityManager getEntityManager() {
    return entityManagerFactory.getEntityManager();
}

    EntityManagerFactory 是线程保存。

    【讨论】：

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