1

我正在将我们的 jsf 项目迁移到 Spring Webflow + JSF。我们使用 ehcache 来存储有关聊天和用户数据的信息。Dpwb 类（序列化）从 ehcache 中提取数据。只要 Dpwb 类被序列化它就应该工作，为什么它正在寻找序列化 ehcache ，我对此无能为力。

流.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>

例外

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)
4

1 回答 1

2

异常表明 WebFlow 尝试序列化的对象之一具有类型为 的实例变量（或包含另一个具有实例变量的对象）net.sf.ehcache.Cache，该实例变量不可序列化。请注意，仅将对象标记为 是不够的，它的java.io.Serializable所有序列化成员也必须是可序列化的。

这个问题描述了一个测试，您可以使用它来检查某些东西是否真的可序列化（必须填充实例变量才能使测试有意义）：

如何在 Java 中测试一个类是否正确实现了 Serializable（不仅仅是 Serializable 的实例）

从您的流程定义来看，它看起来com.emyed.whiteboard.controller.WhiteboardIdentifiers必须是可序列化的，因为它存储在流程范围内。

据我所知，“Dpwb”类似乎不需要可序列化，因为它只存储在视图范围内，不需要可序列化。

于 2013-10-10T11:17:45.870 回答