javax.ejb.EJBException：javax.ejb.CreateException：Singleton Bean初始化失敗

Question

嗨，我在將我的EJB模塊項目部署到我的Glassfish Application Server時遇到異常：

它說未能初始化我的Singleton bean“ HibernateUtil”。 完整的堆棧跟蹤在這里：

Caused by: javax.ejb.EJBException: javax.ejb.CreateException: Initialization failed for Singleton HibernateUtil
    at com.sun.ejb.containers.AbstractSingletonContainer$SingletonContextFactory.create(AbstractSingletonContainer.java:656)
    at com.sun.ejb.containers.AbstractSingletonContainer.instantiateSingletonInstance(AbstractSingletonContainer.java:396)
    at org.glassfish.ejb.startup.SingletonLifeCycleManager.initializeSingleton(SingletonLifeCycleManager.java:219)
    at org.glassfish.ejb.startup.SingletonLifeCycleManager.initializeSingleton(SingletonLifeCycleManager.java:213)
    at org.glassfish.ejb.startup.SingletonLifeCycleManager.initializeSingleton(SingletonLifeCycleManager.java:180)
    at com.sun.ejb.containers.AbstractSingletonContainer.checkInit(AbstractSingletonContainer.java:368)
    at com.sun.ejb.containers.CMCSingletonContainer._getContext(CMCSingletonContainer.java:116)
    at com.sun.ejb.containers.BaseContainer.getContext(BaseContainer.java:2516)
    at com.sun.ejb.containers.BaseContainer.preInvoke(BaseContainer.java:1906)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:210)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandlerDelegate.invoke(EJBLocalObjectInvocationHandlerDelegate.java:88)
    at com.sun.proxy.$Proxy480.insert(Unknown Source)
    at dao.__EJB31_Generated__CourseDAO__Intf____Bean__.insert(Unknown Source)
    at service.CourseService.insert(CourseService.java:30)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.glassfish.ejb.security.application.EJBSecurityManager.runMethod(EJBSecurityManager.java:1081)
    at org.glassfish.ejb.security.application.EJBSecurityManager.invoke(EJBSecurityManager.java:1153)
    at com.sun.ejb.containers.BaseContainer.invokeBeanMethod(BaseContainer.java:4695)
    at com.sun.ejb.EjbInvocation.invokeBeanMethod(EjbInvocation.java:630)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
    at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:46)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.EjbInvocation.proceed(EjbInvocation.java:582)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.doCall(SystemInterceptorProxy.java:163)
    at com.sun.ejb.containers.interceptors.SystemInterceptorProxy.aroundInvoke(SystemInterceptorProxy.java:140)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at com.sun.ejb.containers.interceptors.AroundInvokeInterceptor.intercept(InterceptorManager.java:883)
    at com.sun.ejb.containers.interceptors.AroundInvokeChainImpl.invokeNext(InterceptorManager.java:822)
    at com.sun.ejb.containers.interceptors.InterceptorManager.intercept(InterceptorManager.java:369)
    at com.sun.ejb.containers.BaseContainer.__intercept(BaseContainer.java:4667)
    at com.sun.ejb.containers.BaseContainer.intercept(BaseContainer.java:4655)
    at com.sun.ejb.containers.EJBLocalObjectInvocationHandler.invoke(EJBLocalObjectInvocationHandler.java:212)
    ... 91 more

這是我的HibernateUtil bean：

@Singleton
@Startup
@LocalBean
public class HibernateUtil {

private SessionFactory sessionFactory;

public SessionFactory getSessionFactory() {
    return sessionFactory;
}

@PostConstruct
public void buildSessionFactory() {
    Configuration config = new Configuration();
    config.configure("hibernate.cfg.xml");
    StandardServiceRegistryBuilder ssrb = new StandardServiceRegistryBuilder().applySettings(config.getProperties());
    sessionFactory = config.buildSessionFactory(ssrb.build());
}

}


<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
    <!-- DataSource properties (begin) -->
    <property name="hibernate.connection.datasource">testdb</property>

    <!-- JTA transaction properties (begin) -->
    <property name="hibernate.current_session_context_class">jta</property>
    <property name="hibernate.transaction.factory_class">org.hibernate.transaction.CMTTransactionFactory</property>
    <property name="hibernate.transaction.manager_lookup_class">org.hibernate.transaction.SunONETransactionManagerLookup</property>

    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.show_sql">true</property>
    <property name="hibernate.hbm2ddl.auto">update</property>
    <property name="hibernate.cache.use_second_level_cache">false</property>
    <property name="hibernate.cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
    <property name="hibernate.connection.zeroDateTimeBehavior">convertToNull</property>
    <property name="hibernate.transaction.auto_close_session">true</property>

     <!--Names the annotated entity class--> 
    <mapping class="entity.Course"/>
</session-factory>
</hibernate-configuration>

誰能告訴我我的代碼是否遺漏了什么。 謝謝

Answer 1

如果StandardServiceRegistryBuilder的初始化沒有任何問題（例如，注釋掉仍會引發相同的異常），則以下提示可能會有所幫助：

重構大型項目后，我遇到了相同的異常，並且我100％確信@Singleton bean的初始化程序沒有問題。 在將項目模塊的各個部分逐位復制到新項目后，我發現該異常的原因是WAR模塊中的重復命名。 具有@Named批注的兩個bean與value參數具有相同的名稱（由於復制粘貼錯誤）。 例如：

Bean1：

@Named("duplicateBeanName")
public class Bean1 implements Serializable {
    ...
}

Bean2：

@Named("duplicateBeanName")
public class Bean2 implements Serializable {
    ...
}