我刚刚将我的 Beans 转换为ViewScoped而不是RequestScoped. 但是，由于我必须添加Serialized这些 bean，所以我遇到了两个java.io.NotSerializableException例外。
这是我的web.xml：
<filter>
<filter-name>PrimeFaces FileUpload Filter</filter-name>
<filter-class>org.primefaces.webapp.filter.FileUploadFilter</filter-class>
</filter>
<filter>
<filter-name>loginFilter</filter-name>
<filter-class>com.company.rews.webclient.controller.LoginFilter</filter-class>
</filter>
<servlet>
<servlet-name>Faces Servlet</servlet-name>
<servlet-class>com.company.rews.webclient.controller.MyFacesServletWrapper</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
它报告此异常的第一个地方是内部的某个地方super.service(req, res)：
public class MyFacesServletWrapper extends MyFacesServlet
{
@Override
public void service(ServletRequest request, ServletResponse response)
throws IOException, ServletException
{
HttpServletRequest req = (HttpServletRequest) request;
HttpServletResponse res = (HttpServletResponse) response;
req.setCharacterEncoding("UTF-8");
res.setCharacterEncoding("UTF-8");
try
{
super.service(req, res);
}
catch (ServletException e)
{
e.printStackTrace();
LoginFilter.gotoLogin(e, req, res);
}
}
}
在这里chain.doFilter(request, response)：
public class LoginFilter implements Filter
{
private static final String SYSTEM_ERROR_URI = "/login.faces";
private static final String VIEWEX_ERROR_URI = "/login.faces";
@Override
public void doFilter( ServletRequest req, ServletResponse res, FilterChain chain ) throws IOException, ServletException
{
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
if ( isResourceRequest(request, response) )
{
chain.doFilter(request, response);
}
else if ( !isLoggedIn(request, response) && isLoginArea(request, response) )
{
gotoLogin(null, request, response);
}
else if( !isUserConnectedToREWS( request ) && isLoginArea(request, response) )
{
gotoLogin(null, request, response);
}
else
{
chain.doFilter(request, response);
}
}
这是完整的错误报告：
08.05.2013. 18:03:47 org.apache.myfaces.renderkit.ServerSideStateCacheImpl serializeView
SEVERE: Exiting serializeView - Could not serialize state: org.apache.myfaces.context.servlet.ServletExternalContextImpl
java.io.NotSerializableException: org.apache.myfaces.context.servlet.ServletExternalContextImpl
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
at java.util.HashMap.writeObject(HashMap.java:1001)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1346)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1154)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
at java.util.HashMap.writeObject(HashMap.java:1001)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1346)
at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1154)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
at org.apache.myfaces.renderkit.ServerSideStateCacheImpl.serializeView(ServerSideStateCacheImpl.java:390)
at org.apache.myfaces.renderkit.ServerSideStateCacheImpl.saveSerializedViewInServletSession(ServerSideStateCacheImpl.java:240)
at org.apache.myfaces.renderkit.ServerSideStateCacheImpl.saveSerializedView(ServerSideStateCacheImpl.java:872)
at org.apache.myfaces.renderkit.html.HtmlResponseStateManager.saveState(HtmlResponseStateManager.java:144)
at org.apache.myfaces.application.StateManagerImpl.saveView(StateManagerImpl.java:195)
at org.apache.myfaces.view.facelets.FaceletViewDeclarationLanguage.renderView(FaceletViewDeclarationLanguage.java:1971)
at org.apache.myfaces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:285)
at org.apache.myfaces.lifecycle.RenderResponseExecutor.execute(RenderResponseExecutor.java:115)
at org.apache.myfaces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:241)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:199)
at org.apache.myfaces.webapp.MyFacesServlet.service(MyFacesServlet.java:112)
at com.mainconcept.rews.webclient.controller.MyFacesServletWrapper.service(MyFacesServletWrapper.java:30)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.company.rews.webclient.controller.LoginFilter.doFilter(LoginFilter.java:54)
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:225)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:999)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:565)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
如果这是这里的问题，我如何排除 servlet-filters 必须被序列化？