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我正在將我們的jsf項目遷移到Spring Webflow + JSF。我們使用ehcache來存儲有關聊天和用戶數據的信息。 Dpwb類（序列化）從ehcache中提取數據。只要Dpwb類是序列化的，它應該工作，爲什麼它正在尋找序列化ehcache，我無法對它做任何事情。java.io.NotSerializableException：Spring Webflow項目中的net.sf.ehcache.Cache
flow.xml
<flow xmlns="http://www.springframework.org/schema/webflow"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.springframework.org/schema/webflow
http://www.springframework.org/schema/webflow/spring-webflow-2.0.xsd">
<var name="wbIdentifiers" class="com.emyed.whiteboard.controller.WhiteboardIdentifiers" />
<view-state id="createWb" view="createdialog.xhtml">
<transition on="create" to="wboard">
<evaluate expression="generalCreateWhiteboard.create()"
result="wbIdentifiers" />
</transition>
</view-state>
<view-state id="wboard" view="/WEB-INF/views/D/whiteboard.xhtml">
<on-render>
<evaluate expression="generalCreateWhiteboard.setDisplayWhiteboard(wbIdentifiers)" result="viewScope.dpwb "></evaluate>
</on-render>
</view-state>
</flow>
異常
org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.webflow.execution.repository.snapshot.SnapshotCreationException: Could not serialize flow execution; make sure all objects stored in flow or flash scope are serializable
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:948)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
org.springframework.webflow.execution.repository.snapshot.SnapshotCreationException: Could not serialize flow execution; make sure all objects stored in flow or flash scope are serializable
org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.<init>(SerializedFlowExecutionSnapshot.java:75)
org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshotFactory.createSnapshot(SerializedFlowExecutionSnapshotFactory.java:70)
org.springframework.webflow.execution.repository.snapshot.AbstractSnapshottingFlowExecutionRepository.snapshot(AbstractSnapshottingFlowExecutionRepository.java:75)
org.springframework.webflow.execution.repository.impl.DefaultFlowExecutionRepository.putFlowExecution(DefaultFlowExecutionRepository.java:126)
org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:171)
org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
root cause
java.io.NotSerializableException: net.sf.ehcache.Cache
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1164)
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1483)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
java.util.HashMap.writeObject(HashMap.java:1001)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:422)
org.springframework.webflow.core.collection.LocalAttributeMap.writeObject(LocalAttributeMap.java:327)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
java.util.HashMap.writeObject(HashMap.java:1001)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1518)
java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:422)
org.springframework.webflow.core.collection.LocalAttributeMap.writeObject(LocalAttributeMap.java:327)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
org.springframework.webflow.engine.impl.FlowSessionImpl.writeExternal(FlowSessionImpl.java:160)
java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1429)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1398)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
java.util.LinkedList.writeObject(LinkedList.java:943)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:945)
java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1469)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1400)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
org.springframework.webflow.engine.impl.FlowExecutionImpl.writeExternal(FlowExecutionImpl.java:309)
java.io.ObjectOutputStream.writeExternalData(ObjectOutputStream.java:1429)
java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1398)
java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1158)
java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:330)
org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.serialize(SerializedFlowExecutionSnapshot.java:173)
org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshot.<init>(SerializedFlowExecutionSnapshot.java:70)
org.springframework.webflow.execution.repository.snapshot.SerializedFlowExecutionSnapshotFactory.createSnapshot(SerializedFlowExecutionSnapshotFactory.java:70)
org.springframework.webflow.execution.repository.snapshot.AbstractSnapshottingFlowExecutionRepository.snapshot(AbstractSnapshottingFlowExecutionRepository.java:75)
org.springframework.webflow.execution.repository.impl.DefaultFlowExecutionRepository.putFlowExecution(DefaultFlowExecutionRepository.java:126)
org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:171)
org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
org.springframework.faces.webflow.JsfFlowHandlerAdapter.handle(JsfFlowHandlerAdapter.java:48)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:925)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:856)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:936)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:827)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:812)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)