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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.
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.
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?).
Any workarounds?
Here is a test with my Problem:
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:
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)
854
After you declare the prefix, you can use it to qualify elements and attributes in an XML document and associate them with the namespace URI. Because the namespace prefix is used throughout a document, it should be short in length. This example defines two BOOK elements.
Managing namespaces. The XmlNamespaceManager class stores a collection of namespace URIs and their prefixes, and lets you look up, add, and remove namespaces from this collection. In certain contexts, this class is required for better XML processing performance. For example, the XsltContext class uses XmlNamespaceManager for XPath support.
Nov 27 '12 at 16:19 The reason this works in XMLStarlet is a feature: "In order to handle namespaces with greater ease, XMLStarlet (versions 1.2.1+) will use the namespace prefixes declared on the root element of the input document." – Tanz87
A namespace must be declared before it can be used, but it doesn't have to appear at the top of the XML document. When you use multiple namespaces in an XML document, you can define one namespace as the default namespace to create a cleaner looking document. The default namespace is declared in the root element...
You're attempting to parse a namespaced document with a non-namespace-aware parser.
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:
SAXParserFactory spf = SAXParserFactory.newInstance();
spf.setNamespaceAware(true);
final SAXParser saxParser = spf.newSAXParser();
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