Java XML中的外部实体在DocumentBuilder.parse（“文件”）期间导致空指针异常；

我试图使用DOM解析器解析XML文档

我在执行doc=builder.parse（xmlDataFile）时遇到空指针异常

XML数据文件中几乎没有实体。在删除特定实体时， 我成功地解析了这个文件

实体就是这样的东西

<!ENTITY SAMPLE.TIF SYSTEM "SAMPLE.TIF" NDATA TIF>

这是跟踪：

 at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.setChunkIndex(DeferredDocumentImpl.java:1944)
    at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.appendChild(DeferredDocumentImpl.java:644)
    at com.sun.org.apache.xerces.internal.parsers.AbstractDOMParser.characters(AbstractDOMParser.java:1191)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.characters(XMLDTDValidator.java:862)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:463)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:225)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:180)
    at XMLParser.Parse(XMLParser.java:89)
    at Main.main(Main.java:116)

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89行号指向->doc=builder.parse（xmlDataFile）

。但是错误的原因确实是未知的，因为解决方案从来没有说明出了什么问题（

这是Xerces中的一个bug，已在2.9.1版中修复

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需要一些示例代码和堆栈跟踪。

 at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.setChunkIndex(DeferredDocumentImpl.java:1944)
    at com.sun.org.apache.xerces.internal.dom.DeferredDocumentImpl.appendChild(DeferredDocumentImpl.java:644)
    at com.sun.org.apache.xerces.internal.parsers.AbstractDOMParser.characters(AbstractDOMParser.java:1191)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.characters(XMLDTDValidator.java:862)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:463)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:225)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:180)
    at XMLParser.Parse(XMLParser.java:89)
    at Main.main(Main.java:116)