org.omnifaces.taghandler.ImportConstants$ConstantsMap，：java.io.NotSerializableException:使用OmniFaces o:OmniFaces OmniFaces

Question

我们用，

• JSF 2.1
• RichFaces 4
• OmniFaces 1.5.

我们得到了以下例外：

 java.io.NotSerializableException: org.omnifaces.taghandler.ImportConstants$ConstantsMap

当使用<o:importConstants>和javax.faces.STATE_SAVING_METHOD作为客户端时，就会出现这种情况。

有人见过这个吗？解决办法是什么？

感谢为解决这一问题提供的任何帮助。

Answer 1

修复很简单，让org.omnifaces.util.MapWrapper也实现Serializable。我已经已承诺了，它在今天最新的1.8快照上有售。不过，原因很奇怪。我没想到它会保存到JSF状态，因为它是一个EL表达式。所以我看了看得更远一些，只是为了学习。

为了完整起见，下面是我在Tomcat 7.0.47上遇到的mojarra2.1.28的堆栈跟踪，它保存了客户端状态，并使用了一个<f:event>，它将一个常量作为方法参数传递，如下所示：

<o:importConstants type="com.example.Constants" />
<f:event type="preRenderView" listener="#{bean.method(Constants.SOME)}" />

当只打开页面时，已发生异常，不需要回发。

java.io.NotSerializableException: org.omnifaces.taghandler.ImportConstants$ConstantsMap
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1181)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at org.apache.el.ValueExpressionLiteral.writeExternal(ValueExpressionLiteral.java:109)
    at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1456)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1427)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at java.util.HashMap.writeObject(HashMap.java:1100)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at org.apache.el.lang.VariableMapperImpl.writeExternal(VariableMapperImpl.java:59)
    at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1456)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1427)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at org.apache.el.MethodExpressionImpl.writeExternal(MethodExpressionImpl.java:308)
    at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1456)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1427)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at com.sun.faces.facelets.el.TagMethodExpression.writeExternal(TagMethodExpression.java:152)
    at java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1456)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1427)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1541)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1506)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1541)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1506)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1375)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1171)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1375)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1171)
    at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1541)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1506)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at java.util.ArrayList.writeObject(ArrayList.java:710)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1375)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1171)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1375)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1171)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1375)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1171)
    at java.io.ObjectOutputStream.writeArray(ObjectOutputStream.java:1375)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1171)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at java.util.HashMap.writeObject(HashMap.java:1100)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:988)
    at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493)
    at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1429)
    at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1175)
    at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:347)
    at com.sun.faces.renderkit.ClientSideStateHelper.doWriteState(ClientSideStateHelper.java:424)
    at com.sun.faces.renderkit.ClientSideStateHelper.writeState(ClientSideStateHelper.java:210)
    at com.sun.faces.renderkit.ResponseStateManagerImpl.writeState(ResponseStateManagerImpl.java:122)
    at com.sun.faces.application.StateManagerImpl.writeState(StateManagerImpl.java:113)
    at com.sun.faces.application.view.WriteBehindStateWriter.flushToWriter(WriteBehindStateWriter.java:225)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:464)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:125)
    at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:286)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    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.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    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:724)

还有..。ValueExpressionLiteral出现在画面中。Enum值被解析为EL文本。ValueExpressionLiteral将序列化用于状态保存的文本值(求值值本身)，而不是具体表达式#{Constants.SOME}。这毕竟是有道理的，反正枚举都是常量。