我创建了一个通用的无状态EJB(LoadEntityEJBImpl)，用于我的所有JPA事务。我使用ejb-jar.xml注入不带注释的entityManager，这样我就可以控制每个应用程序使用哪个持久资源。
我遇到的问题是，在我使用过这个EJB的所有web应用程序中，当我调用一个页面上的一个事务，然后打开另一个页面的新选项卡时。EJB有时会发生冲突并引发异常。
我认为可能发生的情况是，当我到达第一个页面时，EJB被创建(如果不存在或不可用)然后，当它完成使用时，它会返回到EJB池(可用于其他请求)。然后，我打开我的新选项卡，EJB被从EJB池中取出，并对其设置了以前的参数
returnedToPark是我的订单实体中的一列，但我没有以任何形式为该表进行选择，包括懒惰和egar加载。
例外情况如下：
java.lang.IllegalArgumentException: Unable to resolve attribute [returnedToPark] against path
at org.hibernate.ejb.criteria.path.AbstractPathImpl.unknownAttribute(AbstractPathImpl.java:120)
at org.hibernate.ejb.criteria.path.AbstractPathImpl.locateAttribute(AbstractPathImpl.java:229)
at org.hibernate.ejb.criteria.path.AbstractPathImpl.get(AbstractPathImpl.java:200)
at au.com.xxx.ejb.LoadEntityEJBImpl.generateFilterPredicates(LoadEntityEJBImpl.java:317)
at au.com.xxx.ejb.LoadEntityEJBImpl.generateFilterPredicatesWithDates(LoadEntityEJBImpl.java:157)
at au.com.xxx.ejb.LoadEntityEJBImpl.createCriteriaQuery(LoadEntityEJBImpl.java:123)
at au.com.xxx.ejb.LoadEntityEJBImpl.buildEntityObjectsQuery(LoadEntityEJBImpl.java:110)
at au.com.xxx.ejb.LoadEntityEJBImpl.getEntityObjectsByRange(LoadEntityEJBImpl.java:806)
at sun.reflect.GeneratedMethodAccessor184.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:182)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:164)
at org.apache.openejb.monitoring.StatsInterceptor.record(StatsInterceptor.java:180)
at org.apache.openejb.monitoring.StatsInterceptor.invoke(StatsInterceptor.java:99)
at sun.reflect.GeneratedMethodAccessor144.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext$Invocation.invoke(ReflectionInvocationContext.java:182)
at org.apache.openejb.core.interceptor.ReflectionInvocationContext.proceed(ReflectionInvocationContext.java:164)
at org.apache.openejb.core.interceptor.InterceptorStack.invoke(InterceptorStack.java:80)
at org.apache.openejb.core.stateless.StatelessContainer._invoke(StatelessContainer.java:212)
at org.apache.openejb.core.stateless.StatelessContainer.invoke(StatelessContainer.java:181)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler.synchronizedBusinessMethod(EjbObjectProxyHandler.java:268)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler.businessMethod(EjbObjectProxyHandler.java:263)
at org.apache.openejb.core.ivm.EjbObjectProxyHandler._invoke(EjbObjectProxyHandler.java:86)
at org.apache.openejb.core.ivm.BaseEjbProxyHandler.invoke(BaseEjbProxyHandler.java:303)
at com.sun.proxy.$Proxy98.getEntityObjectsByRange(Unknown Source)
at org.apache.jsp.operations.container.schedule.containerScheduleIndex_jsp._jspService(containerScheduleIndex_jsp.java:1584)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.tomee.catalina.OpenEJBValve.invoke(OpenEJBValve.java:45)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:611)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
以下是ejb-jar.xml的内容：
<?xml version="1.0" encoding="UTF-8"?>
<ejb-jar xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns="http://java.sun.com/xml/ns/javaee" xmlns:ejb="http://java.sun.com/xml/ns/javaee/ejb-jar_3_0.xsd"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd"
version="3.1">
<module-name>PKWebapp</module-name>
<enterprise-beans>
<session id="PKWebappID">
<ejb-name>LoadEntityEJBPKWebapp</ejb-name>
<mapped-name>LoadEntityEJBPKWebappMapped</mapped-name>
<business-remote>au.com.xxx.ejb.LoadEntityEJB</business-remote>
<ejb-class>au.com.xxx.ejb.LoadEntityEJBImpl</ejb-class>
<session-type>Stateless</session-type>
<persistence-context-ref id="PKIDWebapp">
<description>PKWebapp reference</description>
<persistence-context-ref-name>LoadEntityEJBImplRefNamePKWebapp/entityManager</persistence-context-ref-name>
<persistence-unit-name>PKWebappDS</persistence-unit-name>
<persistence-context-type>Transaction</persistence-context-type>
<injection-target>
<injection-target-class>au.com.xxx.ejb.LoadEntityEJBImpl</injection-target-class>
<injection-target-name>entityManager</injection-target-name>
</injection-target>
</persistence-context-ref>
</session>
</enterprise-beans>
</ejb-jar>
由于隐私原因，我不能给出LoadEntityEJBImpl的完整代码示例，但我可以提供一个小示例。
@Stateless
public class LoadEntityEJBImpl<T> implements LoadEntityEJB<T>, Serializable {
private static final long serialVersionUID = -6359834805546452108L;
private static final Logger log = Logger.getLogger(LoadEntityEJBImpl.class.getName());
private EntityManagerFactory factory;
private EntityManager entityManager;
private Class<T> entityClass;
@Resource
private EJBContext context;
@Override
public EntityManager getEM() {
if (entityManager == null) {
entityManager = getFactory().createEntityManager();
}
return entityManager;
}
@Override
public EntityManagerFactory getFactory() {
return factory;
}
public void setFactory(EntityManagerFactory factory) {
this.factory = factory;
}
...
提前感谢你能给我的任何帮助。
在您的堆栈跟踪中，我看到一些容器调度程序(位于org.apache.jsp.operation.container.schedule.connerScheduleIndex_jsp._jspService(containerScheduleIndex_jsp.java:1584))运行方法getEntityObjectsByRange(位于com.sun.prox.$Proxy98.getEntityObjects ByRange(未知源))。检查你在glassfish中的部署，并从中清除可能的旧部署。