web容器中，JPA+JSF，
改了后台Bean一下后，在重新访问，就这样。。
重启服务器后又可以了，会不会是什么东西忘记关了导致一直留在容器里啊？？

后来每次执行完方法把emf也close掉就没问题了，是不是就是emf一直留在web容器内存中导致线程冲突，强制stop，导致ThreadDeath，这个原因呢？






正在对上下文“/JPAtest”初始化 Sun 的 JavaServer Faces 实现 (1.2_04-b20-p03)
PWC1635：访问非法：此 Web 应用程序实例已被停止（最终得到的以下堆栈追踪由一个错误导致，抛出该错误是出于调试目的，以及尝试终止导致非法访问的线程，并且该堆栈追踪对功能没有影响）
PWC1635：访问非法：此 Web 应用程序实例已被停止（最终得到的以下堆栈追踪由一个错误导致，抛出该错误是出于调试目的，以及尝试终止导致非法访问的线程，并且该堆栈追踪对功能没有影响）
StandardWrapperValve[Faces Servlet]: PWC1406：Servlet Faces Servlet 的 Servlet.service() 抛出异常
java.lang.ThreadDeath
        at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1333)
        at java.beans.Introspector.instantiate(Introspector.java:1438)
        at java.beans.Introspector.findExplicitBeanInfo(Introspector.java:410)
        at java.beans.Introspector.(Introspector.java:359)
        at java.beans.Introspector.getBeanInfo(Introspector.java:159)
        at javax.el.BeanELResolver$BeanProperties.(BeanELResolver.java:121)
        at javax.el.BeanELResolver.getBeanProperty(BeanELResolver.java:542)
        at javax.el.BeanELResolver.getValue(BeanELResolver.java:249)
        at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:143)
        at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:64)
        at com.sun.el.parser.AstValue.getValue(AstValue.java:138)
        at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:206)
        at javax.faces.component.UIOutput.getValue(UIOutput.java:173)
        at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getValue(HtmlBasicInputRenderer.java:189)
        at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.getCurrentValue(HtmlBasicRenderer.java:320)
        at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeEnd(HtmlBasicRenderer.java:200)
        at javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:836)
        at com.sun.faces.renderkit.html_basic.HtmlBasicRenderer.encodeRecursive(HtmlBasicRenderer.java:279)
        at com.sun.faces.renderkit.html_basic.TableRenderer.encodeChildren(TableRenderer.java:307)
        at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:812)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:886)
        at javax.faces.component.UIComponent.encodeAll(UIComponent.java:892)
        at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:245)
        at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:176)
        at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:106)
        at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251)
        at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:144)
        at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
        at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:411)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:317)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:390)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:230)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:198)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:288)
        at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:271)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:202)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:206)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:150)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:632)
        at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:577)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:571)
        at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1080)
        at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:272)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:637)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:568)
        at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:813)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
        at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
        at com.sun.enterprise.web.portunif.PortUnificationPipeline$PUTask.doTask(PortUnificationPipeline.java:380)
        at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
        at com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)