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我正在使用 Oracle JDK 1.7 (xjc 2.2.4-2) 中的 JAXB，在 JDK 的 Unix 版本上运行时有时会出现此错误（不确定它在 Windows 上也不会发生）。知道它可能是什么吗？

java.lang.ClassCastException: [... my - class ... ] cannot be cast to com.sun.xml.internal.bind.v2.runtime.unmarshaller.DomLoader$State
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.DomLoader.startElement(DomLoader.java:104)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.ProxyLoader.startElement(ProxyLoader.java:45)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext._startElement(UnmarshallingContext.java:486)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallingContext.startElement(UnmarshallingContext.java:465)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.InterningXmlVisitor.startElement(InterningXmlVisitor.java:60)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.SAXConnector.startElement(SAXConnector.java:135)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:229)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:266)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:235)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:266)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:235)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:266)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.visit(DOMScanner.java:235)
    at com.sun.xml.internal.bind.unmarshaller.DOMScanner.scan(DOMScanner.java:112)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:309)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:288)
    at com.sun.xml.internal.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:238)
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