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好的，我很茫然。我有這條線一個空指針：JAXB內容沒有實例化
JAXBContext context = JAXBContext.newInstance(X3D.class);
這裏是輸出錯誤的事情：
Exception in thread "main" java.lang.NullPointerException
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.checkOverrideProperties(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementProperty.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.ArrayElementNodeProperty.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.SingleElementNodeProperty.<init>(Unknown Source)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.property.PropertyFactory.create(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getOrCreate(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(Unknown Source)
at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(Unknown Source)
at com.sun.xml.internal.bind.v2.ContextFactory.createContext(Unknown Source)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
at javax.xml.bind.ContextFinder.newInstance(Unknown Source)
at javax.xml.bind.ContextFinder.find(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at javax.xml.bind.JAXBContext.newInstance(Unknown Source)
at com.prim.esaa.gui.x3d.MyXmlWriter.myWriteFile(MyXmlWriter.java:159)
at com.prim.esaa.gui.x3d.MyXmlWriter.myWrite(MyXmlWriter.java:199)
at com.prim.esaa.gui.x3d.Sim3DAnimator.writeXMLoutput(Sim3DAnimator.java:266)
at com.prim.esaa.gui.x3d.Sim3DAnimator.initModels(Sim3DAnimator.java:212)
at com.prim.esaa.gui.x3d.Sim3DAnimator.main(Sim3DAnimator.java:141)
我意識到，並非所有的代碼是存在的，我可以添加更多的，但如果我的理解正確地說，這個命令設置的東西，並不完全依賴於我的任何其他變量。它正在工作，然後停下來。我不知道爲什麼。
它一遍又一遍地說「未知來源」，但我包括路徑和類X3D，以便它應該沒問題。
謝謝。
X3D是什麼樣的？它是否正確註釋？ – Reimeus 2012-08-05 16:49:14
X3D文件爲空。 X3D類文件看起來很好。然後我在另一個文件中實例化，並將該X3D創建的變量傳遞給此函數，稍後在編組時使用。但是在這條線上，如果我理解正確，那只是設置和失敗。 – 2012-08-05 17:00:12