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Java：爲什麼我的對象實例有兩個serialVersionUID？

2012-11-29 81 views
0

我正在使用Glassfish 3.1.2.2，eclipse-link作爲JPA提供程序和Java JDK-6u31。我的應用程序是3層獨立的Swing客戶機，它運行在它自己的JVM上。通過JNDI查找和@Remote接口與EJB進行通信。Java：爲什麼我的對象實例有兩個serialVersionUID？

我有以下對象繼承結構：

我的超類 「文件」：

@Entity 
@Table(name = "Document") 
@Inheritance(strategy=InheritanceType.TABLE_PER_CLASS) 
public class Document implements IUpdateableEntity { 

    private static final long serialVersionUID = 1L; 

    @Id 
    @GeneratedValue(strategy = GenerationType.SEQUENCE) 
    private Long id; 

    @Basic(optional=false, fetch=FetchType.LAZY) 
    @Lob 
    private byte[] content; 

    @Transient 
    private transient File file; 

    public Document() { } 

    // getters and setters ... 

}

...和子類 「發票」：

@Entity 
@Table(name = "Dokument") 
public class Invoice extends Document implements IUpdateableEntity { 

    private static final long serialVersionUID = 1L; 

    // some additional relations and attributes ... 

    public Invoice() { } 

    // getters and setters ... 

}

現在我在調用我的ejb facade以獲取此異常以持久保存發票對象（調用persist（），flush（），refresh（）並將對象返回給客戶端以便爲客戶端提供auto-generat編輯ID）：

29.11.2012 20:21:25 com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator handleFullLogging 
WARNUNG: IOP00810011: Exception from readValue on ValueHandler in CDRInputStream 
org.omg.CORBA.MARSHAL: WARNUNG: IOP00810011: Exception from readValue on ValueHandler in CDRInputStream vmcid: OMG minor code: 11 completed: Maybe

我已經通過網絡梳理，發現指向的serialVersionUID問題，因爲CORBA編組顯然在這個例子中失敗的提示。

然後我打開我的Netbeans IDE中調試器和反思的對象的狀態，然後發送到服務器端的EJB bean。

我意識到，在調試器窗口中打開靜態域節點時，有一個重複的serialVersionUID（與下面的圖片對比）：

enter image description here

- 有人任何線索如何解決這個問題呢？

我在我的項目中有這樣的其他繼承結構，它們構造得非常類似（沒有@Lob），我沒有這個問題......可能@Lob字段以某種方式引發這種行爲？

任何幫助，高度讚賞&預先感謝您！

編輯：下面是完整的堆棧跟蹤：

29.11.2012 20:21:25 com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator handleFullLogging 
WARNUNG: IOP00810011: Exception from readValue on ValueHandler in CDRInputStream 
org.omg.CORBA.MARSHAL: WARNUNG: IOP00810011: Exception from readValue on ValueHandler in CDRInputStream vmcid: OMG minor code: 11 completed: Maybe 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) 
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39) 
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27) 
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513) 
    at com.sun.corba.ee.spi.orbutil.logex.corba.CorbaExtension.makeException(CorbaExtension.java:248) 
    at com.sun.corba.ee.spi.orbutil.logex.corba.CorbaExtension.makeException(CorbaExtension.java:95) 
    at com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator.handleFullLogging(WrapperGenerator.java:387) 
    at com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator.access$400(WrapperGenerator.java:107) 
    at com.sun.corba.ee.spi.orbutil.logex.WrapperGenerator$2.invoke(WrapperGenerator.java:511) 
    at com.sun.corba.ee.spi.orbutil.proxy.CompositeInvocationHandlerImpl.invoke(CompositeInvocationHandlerImpl.java:99) 
    at $Proxy24.valuehandlerReadException(Unknown Source) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1022) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1123) 
    at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:531) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:2162) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2404) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1224) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:425) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:308) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:274) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1015) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1123) 
    at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:531) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:2162) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2404) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1224) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:425) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:308) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:274) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1015) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1123) 
    at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:531) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:2162) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2404) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1224) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:425) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:308) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:274) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1015) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1123) 
    at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:531) 
    at com.sun.corba.ee.impl.presentation.rmi.ExceptionHandlerImpl$ExceptionRWRMIImpl.read(ExceptionHandlerImpl.java:180) 
    at com.sun.corba.ee.impl.presentation.rmi.ExceptionHandlerImpl.readException(ExceptionHandlerImpl.java:290) 
    at com.sun.corba.ee.impl.presentation.rmi.DynamicMethodMarshallerImpl.readException(DynamicMethodMarshallerImpl.java:502) 
    at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.privateInvoke(StubInvocationHandlerImpl.java:205) 
    at com.sun.corba.ee.impl.presentation.rmi.StubInvocationHandlerImpl.invoke(StubInvocationHandlerImpl.java:152) 
    at com.sun.corba.ee.impl.presentation.rmi.codegen.CodegenStubBase.invoke(CodegenStubBase.java:227) 
    at ch.lawsuite.control.__DokumentFacadeRemote_Remote_DynamicStub.create(ch/lawsuite/control/__DokumentFacadeRemote_Remote_DynamicStub.java) 
    at ch.lawsuite.control._DokumentFacadeRemote_Wrapper.create(ch/lawsuite/control/_DokumentFacadeRemote_Wrapper.java) 
    at ch.lawsuite.gui.misc.unterlagen.ModDocumentUI.btnSpeichernActionPerformed(ModDocumentUI.java:631) 
    at ch.lawsuite.gui.misc.unterlagen.ModDocumentUI.access$300(ModDocumentUI.java:52) 
    at ch.lawsuite.gui.misc.unterlagen.ModDocumentUI$6.actionPerformed(ModDocumentUI.java:384) 
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) 
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) 
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) 
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) 
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) 
    at java.awt.Component.processMouseEvent(Component.java:6290) 
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) 
    at java.awt.Component.processEvent(Component.java:6055) 
    at java.awt.Container.processEvent(Container.java:2039) 
    at java.awt.Component.dispatchEventImpl(Component.java:4653) 
    at java.awt.Container.dispatchEventImpl(Container.java:2097) 
    at java.awt.Component.dispatchEvent(Component.java:4481) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575) 
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236) 
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166) 
    at java.awt.Container.dispatchEventImpl(Container.java:2083) 
    at java.awt.Window.dispatchEventImpl(Window.java:2482) 
    at java.awt.Component.dispatchEvent(Component.java:4481) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648) 
    at java.awt.EventQueue.access$000(EventQueue.java:84) 
    at java.awt.EventQueue$1.run(EventQueue.java:607) 
    at java.awt.EventQueue$1.run(EventQueue.java:605) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) 
    at java.awt.EventQueue$2.run(EventQueue.java:621) 
    at java.awt.EventQueue$2.run(EventQueue.java:619) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:618) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178) 
    at java.awt.Dialog$1.run(Dialog.java:1044) 
    at java.awt.Dialog$3.run(Dialog.java:1096) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.awt.Dialog.show(Dialog.java:1094) 
    at java.awt.Component.show(Component.java:1584) 
    at java.awt.Component.setVisible(Component.java:1536) 
    at java.awt.Window.setVisible(Window.java:841) 
    at java.awt.Dialog.setVisible(Dialog.java:984) 
    at ch.lawsuite.gui.misc.unterlagen.ModDocumentUI.showFrame(ModDocumentUI.java:118) 
    at ch.lawsuite.gui.dateneinheit.akte.AkteUI.btnImportFestplatteActionPerformed(AkteUI.java:5877) 
    at ch.lawsuite.gui.dateneinheit.akte.AkteUI.access$3300(AkteUI.java:75) 
    at ch.lawsuite.gui.dateneinheit.akte.AkteUI$126.actionPerformed(AkteUI.java:4170) 
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) 
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) 
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) 
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) 
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) 
    at java.awt.Component.processMouseEvent(Component.java:6290) 
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) 
    at java.awt.Component.processEvent(Component.java:6055) 
    at java.awt.Container.processEvent(Container.java:2039) 
    at java.awt.Component.dispatchEventImpl(Component.java:4653) 
    at java.awt.Container.dispatchEventImpl(Container.java:2097) 
    at java.awt.Component.dispatchEvent(Component.java:4481) 
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575) 
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236) 
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166) 
    at java.awt.Container.dispatchEventImpl(Container.java:2083) 
    at java.awt.Window.dispatchEventImpl(Window.java:2482) 
    at java.awt.Component.dispatchEvent(Component.java:4481) 
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:648) 
    at java.awt.EventQueue.access$000(EventQueue.java:84) 
    at java.awt.EventQueue$1.run(EventQueue.java:607) 
    at java.awt.EventQueue$1.run(EventQueue.java:605) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) 
    at java.awt.EventQueue$2.run(EventQueue.java:621) 
    at java.awt.EventQueue$2.run(EventQueue.java:619) 
    at java.security.AccessController.doPrivileged(Native Method) 
    at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) 
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:618) 
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) 
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) 
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) 
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) 
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) 
Caused by: java.lang.NullPointerException 
    at com.sun.corba.ee.impl.orbutil.ClassInfoCache$ClassInfo.<init>(ClassInfoCache.java:156) 
    at com.sun.corba.ee.impl.orbutil.ClassInfoCache.get(ClassInfoCache.java:281) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.read_value(CDRInputStream_1_0.java:1097) 
    at com.sun.corba.ee.impl.encoding.CDRInputObject.read_value(CDRInputObject.java:531) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObjectField(IIOPInputStream.java:2162) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputClassFields(IIOPInputStream.java:2404) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.inputObject(IIOPInputStream.java:1224) 
    at com.sun.corba.ee.impl.io.IIOPInputStream.simpleReadObject(IIOPInputStream.java:425) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValueInternal(ValueHandlerImpl.java:308) 
    at com.sun.corba.ee.impl.io.ValueHandlerImpl.readValue(ValueHandlerImpl.java:274) 
    at com.sun.corba.ee.impl.encoding.CDRInputStream_1_0.readRMIIIOPValueType(CDRInputStream_1_0.java:1015) 
    ... 121 more

來源

2012-11-29 salocinx

+2

有兩個serialVersionUIDs預計在這種情況下 - 這是在基類中聲明，然後再在子類 - 這是正常的，並建議 - 見最後一段在http://docs.oracle.com/javase/6 /文檔/ API/JAVA/IO/Serializable接口。鑑於這一點，我懷疑serialVersionUID字段是你的問題的原因。堆棧跟蹤中是否有更多細節？ – GreyBeardedGeek

+0

CORBA不使用serialVersionUID。你的問題在別處。 – EJP

+0

@EJB：我忘了提及我有一個3層安裝，它有一個獨立的客戶端運行在它自己的JVM中。通信是通過JNDI（IIORB）和遠程接口完成的。你確定serialVersionUIDs不用於序列化嗎？ – salocinx

回答

1

static領域屬於類。您有一個發票實例，它既是發票也是文檔。所以有兩個名爲serialVersionUID是相關的，Document.serialVersionUID和Invoice.serialVersionUID靜態字段。在正常使用中，由於超類被屏蔽，所以只能看到最上面的一個。加倍，因爲它們是private，因此禁止使用子類訪問。調試器不受可視性規則的約束，顯然會向您顯示兩者。

這似乎是正常的，並沒有任何其他證據，很可能是你的問題的不是原因。

你可能會增加一倍通過改變其中一個值是不同的檢查這一目的（例如2），那麼你應該更清楚地看到在調試器中不同的值。

來源

2012-11-29 23:03:14

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