Java方法适用于1.5但不适用1.6

Question

I have an application which has been running happily under Java 1.5 for around a year. We've just had the boxes updated and had Java 1.6 installed.

After deploying the app to the new server we've found the application is throwing an exception when it tries to transform some XML. We couldn't understand why this was happening until we deployed it locally and the same happened. After changing the SDK to v1.5 the problem stopped and the application runs fine.

Here's the method's source:

import java.io.StringWriter;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Element;
import org.w3c.dom.Node;


   public static String xmlToString(Node node) {
    try {
        Source source = new DOMSource(node);
        StringWriter stringWriter = new StringWriter();
        Result result = new StreamResult(stringWriter);
        TransformerFactory factory = TransformerFactory.newInstance();
        Transformer transformer = factory.newTransformer();
        transformer.transform(source, result);
        return stringWriter.getBuffer().toString();
    } catch (TransformerConfigurationException e) {
        e.printStackTrace();
    } catch (TransformerException e) {
        e.printStackTrace();
    }
    return null;
   }

It's crashing on the "transformer.transform(source, result);" line with exception:

Exception in thread "main" java.lang.AbstractMethodError: org.apache.xerces.dom.DocumentImpl.getXmlStandalone()Z
    at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.setDocumentInfo(DOM2TO.java:373)
    at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(DOM2TO.java:127)
    at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(DOM2TO.java:94)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(TransformerImpl.java:662)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:708)
    at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(TransformerImpl.java:313)

Does anyone know of any changes made to Java between the two versions which would cause this? What would be the easiest fix?

Thanks for your help.

Answer 1

I don't remember if it was between 1.4 and 1.5 or 1.5 and 1.6, but the Xalan libraries that shipped with the JVM from Sun changed their package name. I ran into something similar about 2 years ago. I think what I had to do was explicitly ship my own xalan implementation to fix the problem.

UPDATE: This might have been what I was thinking of, though it still could be related to your problem link text

Answer 2

This problem is known to occur on JDK 1.6 with an older xerces.jar which, when on classpath, provides its own DocumentBuilderFactory.

The problem does not occur when using the platform default factory.

You may want to check your WEB-INF/lib or equivalent.

Answer 3

It is the problem because of jar(Xalan) version conflict. Remove the jars and give a try

Answer 4

I encounter this same java.lang.AbstractMethodError in my code.

At the time changing the version of any libraries was not an option, but I found a workaround by comparing with other code that mysteriously worked. Perhaps this might helps others out there.

It all had to do with the Document I passed into DOMSource(). Originally I had created a document in the standard way:

    private static Document documentFromInputStream(InputStream in) throws ParserConfigurationException, SAXException, IOException {
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    DocumentBuilder builder = factory.newDocumentBuilder();
    Document doc = builder.parse(new InputSource(in));
    return doc;
}

To work around this issue , I change the factory line as follows:

        DocumentBuilderFactory factory = new DocumentBuilderFactoryImpl();

Now I no longer get the exception.

Answer 5

I had the same problem & replaced the xercesImpl-2.0.2.jar file with xercesImpl-2.11.0.jar in class path of my application. Its working fine.

Answer 6

This worked for me.

 TransformerFactory factory = TransformerFactory.newInstance();
    Transformer transformer = factory.newTransformer();
            transformer.setOutputProperty(OutputKeys.METHOD, "xml");
    DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(sWout);
            transformer.transform(source, result);

Answer 7

您可能想要使用Xerces的最新版本（我相信它应该与JDK1.6兼容）