Hi,
the only thing I can tell is that I know Tomcat creates a new class
loader instance per session, though this may be configurable.
Probably you should better cross-post this question to the Tomcat
list.
Cheers
Markus
Abel Wang wrote:
> Hi people,
>
> I'm trying to use the org.apache.bcel.util.JavaWrapper to create a proxy to
> use the class loader org.apache.bcel.util.ClassLoader on tomcat version
> 3.2.1 and am getting an error:
>
>
>
> java.lang.reflect.InvocationTargetException: java.lang.LinkageError: loader
> constraints violated when linking org/xml/sax/HandlerBase class at
> org.apache.tomcat.util.xml.XmlMapper.readXml(XmlMapper.java:325) at
> org.apache.tomcat.startup.Tomcat.execute(Tomcat.java:187) at
> org.apache.tomcat.startup.Tomcat.main(Tomcat.java:235) at
> StartTomcat.main(StartTomcat.java:9) at
> java.lang.reflect.Method.invoke(Native Method) at
> org.apache.bcel.util.JavaWrapper.runMain(JavaWrapper.java:127) at
> org.apache.bcel.util.JavaWrapper.main(JavaWrapper.java:149)
>
>
>
>
> I've traced the exception into the class
> org.apache.tomcat.util.xml.XmlMapper.readXml(File xmlFile, Object root)
> method. Here's the code snippit of that particular method. Any clue as to
> what this error means, why it's happening, and how I can get rid of it so
> tomcat will run under the JavaWrapper?
>
> Is this the right group to post to?
>
> Any help will be GREATLY appreciated.
>
> --Abel
>
>
>
> public Object readXml(File xmlFile, Object root)
> throws Exception
> {
> if(root != null)
> {
> Stack st = getObjectStack();
> this.root = root;
> st.push(root);
> }
> try
> {
>
> SAXParser parser = null;
> SAXParserFactory factory = SAXParserFactory.newInstance();
> factory.setNamespaceAware(false);
> factory.setValidating(validating);
> parser = factory.newSAXParser();
>
> // THIS IS THE LINE THAT CAUSES THE EXCEPTION!!!!!!!!!!!!!!!!!!!!!
> parser.parse(xmlFile, this);
> return root;
> }
> catch(IOException ioe)
> {
> ioe.printStackTrace();
> String msg = "Can't open config file: " + xmlFile + " due to: "
> + ioe;
> throw new Exception(msg);
> }
> catch(SAXException se)
> {
> System.out.println("ERROR reading " + xmlFile);
> System.out.println("At " + se.getMessage());
> System.out.println();
> Exception ex1 = se.getException();
> if(ex1 != null)
> throw ex1;
> else
> throw se;
> }
> }
>
>
>
> on the offending line (i've added comments above the offending line), i've
> traced it into the class loader where it trys to load the class
> javax.xml.parsers.SAXParser. Everything goes fine until the last line.
> When the method loadClass trys to return class, it throws the exception.
>
>
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