Java 使用没有前缀的命名空间解析 XML：NAMESPACE_ERR
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时间：2020-08-13 02:13:29 来源:igfitidea点击:
Parse XML with namespace without prefix: NAMESPACE_ERR
提问by yankee
I try to parse two XML documents: <root/>and <root xmlns="hallo"/>. The first case works fine, but the later case throws an exception (xalan/xerces used is the one shiped with OpenJDK 1.6/1.7). Some googling around suggests that this happens because of the usage of an XML namespace without a prefix. Parsing such a document feels rather normal than exotic to me so I wonder how to work around the problem.
我尝试解析两个 XML 文档：<root/>和<root xmlns="hallo"/>. 第一种情况工作正常，但后一种情况会引发异常（使用的 xalan/xerces 是 OpenJDK 1.6/1.7 附带的那个）。一些谷歌搜索表明，这是因为使用了没有前缀的 XML 命名空间。解析这样的文档对我来说感觉很正常而不是异国情调，所以我想知道如何解决这个问题。
All the other people I found reporting the problem had the problem in the context of a SOAP application and tried to do some sophisticated stuff, but I could not find anyone with a simple setup such is mine.
我发现报告该问题的所有其他人都在 SOAP 应用程序的上下文中遇到了问题，并试图做一些复杂的事情，但我找不到任何像我这样的简单设置的人。
Some people suggested that upgrading xalan to v2.7 solves the problem. I don't know which version is shipped with OpenJDK, but I tried to explicitly putting v2.7.1 on the classpath and nothing changed. (How can I verify that this is the version actually used?).
有人建议将xalan升级到v2.7即可解决问题。我不知道 OpenJDK 附带的是哪个版本，但我尝试将 v2.7.1 明确地放在类路径上，但没有任何改变。（如何验证这是实际使用的版本？）。
Any workarounds?
任何解决方法？
Here is a test with my Problem:
这是我的问题的测试：
public class DemoTest {
@Test(dataProvider = "provide_xml")
public void transform_doesNotThrowException(final String xml) throws Exception {
final SAXParser saxParser = SAXParserFactory.newInstance().newSAXParser();
final SAXSource saxSource = new SAXSource(saxParser.getXMLReader(), new InputSource(new StringReader(xml)));
final Transformer transformer = TransformerFactory.newInstance().newTransformer();
final Document document = DocumentBuilderFactory.newInstance().newDocumentBuilder().newDocument();
final DOMResult result = new DOMResult(document);
transformer.transform(saxSource, result);
}
@DataProvider
public Object[][] provide_xml() {
return new Object[][]{
{"<root/>"}, // works
{"<root xmlns=\"hello\"/>"} // broken
};
}
}
Here is the exception thrown:
这是抛出的异常：
ERROR: 'NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces.'
javax.xml.transform.TransformerException: org.w3c.dom.DOMException: NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces.
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:720)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:317)
at de.smotive.server.resource.ResourceManagerTest.testName(ResourceManagerTest.java:36)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.testng.internal.MethodHelper.invokeMethod(MethodHelper.java:641)
at org.testng.internal.Invoker.invokeMethod(Invoker.java:677)
at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:850)
at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1154)
at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:137)
at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:121)
at org.testng.TestRunner.runWorkers(TestRunner.java:1108)
at org.testng.TestRunner.privateRun(TestRunner.java:737)
at org.testng.TestRunner.run(TestRunner.java:596)
at org.testng.SuiteRunner.runTest(SuiteRunner.java:315)
at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:310)
at org.testng.SuiteRunner.privateRun(SuiteRunner.java:272)
at org.testng.SuiteRunner.run(SuiteRunner.java:221)
at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
at org.testng.TestNG.runSuitesSequentially(TestNG.java:1027)
at org.testng.TestNG.runSuitesLocally(TestNG.java:964)
at org.testng.TestNG.run(TestNG.java:896)
at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:89)
at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:144)
at org.testng.RemoteTestNGStarter.main(RemoteTestNGStarter.java:111)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: org.w3c.dom.DOMException: NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces.
at com.sun.org.apache.xerces.internal.dom.AttrNSImpl.setName(AttrNSImpl.java:108)
at com.sun.org.apache.xerces.internal.dom.AttrNSImpl.<init>(AttrNSImpl.java:77)
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.createAttributeNS(CoreDocumentImpl.java:2142)
at com.sun.org.apache.xerces.internal.dom.ElementImpl.setAttributeNS(ElementImpl.java:659)
at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.startElement(SAX2DOM.java:213)
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.closeStartTag(ToXMLSAXHandler.java:208)
at com.sun.org.apache.xml.internal.serializer.ToSAXHandler.flushPending(ToSAXHandler.java:281)
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.endElement(ToXMLSAXHandler.java:247)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:604)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:183)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.emptyElement(XMLDTDValidator.java:814)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1320)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDriver.scanRootElementHook(XMLDocumentScannerImpl.java:1293)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3080)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:899)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:819)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:748)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:640)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:711)
... 32 more
---------
org.w3c.dom.DOMException: NAMESPACE_ERR: An attempt is made to create or change an object in a way which is incorrect with regard to namespaces.
at com.sun.org.apache.xerces.internal.dom.AttrNSImpl.setName(AttrNSImpl.java:108)
at com.sun.org.apache.xerces.internal.dom.AttrNSImpl.<init>(AttrNSImpl.java:77)
at com.sun.org.apache.xerces.internal.dom.CoreDocumentImpl.createAttributeNS(CoreDocumentImpl.java:2142)
at com.sun.org.apache.xerces.internal.dom.ElementImpl.setAttributeNS(ElementImpl.java:659)
at com.sun.org.apache.xalan.internal.xsltc.trax.SAX2DOM.startElement(SAX2DOM.java:213)
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.closeStartTag(ToXMLSAXHandler.java:208)
at com.sun.org.apache.xml.internal.serializer.ToSAXHandler.flushPending(ToSAXHandler.java:281)
at com.sun.org.apache.xml.internal.serializer.ToXMLSAXHandler.endElement(ToXMLSAXHandler.java:247)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:604)
at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:183)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.emptyElement(XMLDTDValidator.java:814)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1320)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$ContentDriver.scanRootElementHook(XMLDocumentScannerImpl.java:1293)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:3080)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:899)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:625)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:488)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:819)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:748)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:123)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1208)
at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:525)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:640)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:711)
at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:317)
at de.smotive.server.resource.ResourceManagerTest.testName(ResourceManagerTest.java:36)
采纳答案by kdgregory
You're attempting to parse a namespaced document with a non-namespace-aware parser.
您正在尝试使用非命名空间感知解析器解析命名空间文档。
By default, the SAX and DOM parsers are not namespace-aware, you need to explicitly call setNamespaceAware()on the factory. Change your code to look like the following and you should be good to go:
默认情况下，SAX 和 DOM 解析器不是命名空间感知的，您需要在工厂上显式调用setNamespaceAware()。将您的代码更改为如下所示，您应该很高兴：
SAXParserFactory spf = SAXParserFactory.newInstance();
spf.setNamespaceAware(true);
final SAXParser saxParser = spf.newSAXParser();
