 | | | DOMParser & Cannot Inherit from final class exception | DOMParser & Cannot Inherit from final class exception 2003-03-13 - By Sander Bos
Dear Neil,
I am not sure, but trying to get you on the right track.
Looking at the stacktrace, it seems to be a classloading problem with
NSContentDispatcher or ContentDispatcher. Now ContentDispatcher is a
non-final class in the latest Xerces, but final in earlier versions (I
checked versions 2.3.0 and 1.3.0). Since it is an inner class there
should be no change whatsoever that a ClassLoader could ever mistake
them, ever, but....
Maybe you should look whether you have multiple Xerces jars in your
Tomcat directories. Specifically, if you have a xercesImpl.jar in your
webapps/..../WEB-INF/lib directory, and a xerces.jar in common/lib,
replace the one in common/lib with xercesImpl.jar and xml-apis.jar from
elsewhere.
Hope this helps,
--Sander.
> -----Original Message-----
> From: Neil Sherman [mailto:nsherman@(protected)]
> Sent: 13 March, 2003 6:16 PM
> To: xerces-j-user@(protected)
> Subject: RE: DOMParser & Cannot Inherit from final class exception
>
>
> But which is the class that has been declared as final ?
>
> As far as I can see the only class I create (xtest) is declared as
> public, which extends the HttpServlet class which is declared
> as public
> abstract. So where am I trying to extend a final class ?
>
> Thanks
>
>
>
>
> -----Original Message-----
> From: Panos Konstantinidis [mailto:girionis@(protected)]
> Sent: 13 March 2003 14:22
> To: xerces-j-user@(protected)
> Subject: Re: DOMParser & Cannot Inherit from final class exception
>
>
> It's simple. You cannot extend a final class.
>
> --- Neil Sherman <nsherman@(protected)> wrote:
> > Hi all,
> >
> > I am having a problem creating a DOMParser within a
> > Java Servlet. I
> > have the following code
> >
> > import javax.servlet.*;
> > import javax.servlet.http.*;
> > import org.apache.xerces.parsers.DOMParser;
> >
> > public class xtest extends HttpServlet {
> >
> > /** Initializes the servlet.
> > */
> > public void init(ServletConfig config) throws ServletException
> > {
> > super.init(config);
> > xercestest();
> > }
> > public void xercestest()
> > {
> > DOMParser parser = new DOMParser();
> > }
> >
> > ..
> > .. Servlet doGet and doPost methods which do
> > nothing
> > ...
> > ...
> >
> > When the servlet starts its init method gets called.
> > In turn the
> > xercestest method is then called. I was hoping that
> > this would simply
> > create me a new DOMParser and do nothing with it but
> > instead I get the
> > exception below:
> >
> > Any ideas what is happening here ?
> >
> > Many thanks
> >
> > Neil
> >
> >
> > javax.servlet.ServletException: Servlet.init() for
> > servlet xtest threw
> > exception
> > at
> >
> org.apache.catalina.core.StandardWrapper.loadServlet(StandardW
> rapper.jav
> > a:962)
> > at
> >
> org.apache.catalina.core.StandardWrapper.allocate(StandardWrap
> per.java:6
> > 66)
> > at
> >
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardW
> rapperValv
> > e.java:214)
> > at
> >
> org.apache.catalina.core.StandardPipeline$StandardPipelineValv
> eContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipel
> ine.java:4
> > 80)
> > at
> >
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> > at
> >
> org.apache.catalina.core.StandardContextValve.invoke(StandardC
> ontextValv
> > e.java:191)
> > at
> >
> org.apache.catalina.core.StandardPipeline$StandardPipelineValv
> eContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipel
> ine.java:4
> > 80)
> > at
> >
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> > at
> >
> org.apache.catalina.core.StandardContext.invoke(StandardContex
> t.java:241
> > 5)
> > at
> >
> org.apache.catalina.core.StandardHostValve.invoke(StandardHost
> Valve.java
> > :180)
> > at
> >
> org.apache.catalina.core.StandardPipeline$StandardPipelineValv
> eContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
> org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDi
> spatcherVa
> > lve.java:170)
> > at
> >
> org.apache.catalina.core.StandardPipeline$StandardPipelineValv
> eContext.i
> > nvokeNext(StandardPipeline.java:641)
> > at
> >
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReport
> Valve.java
> > :172)
> > at
> >
> org.apache.catalina.core.StandardPipeline$StandardPipelineValv
> eContext.i
> > nvokeNext(StandardPipeline.java:641)
> > at
> >
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipel
> ine.java:4
> > 80)
> > at
> >
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> > at
> >
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEn
> gineValve.
> > java:174)
> > at
> >
> org.apache.catalina.core.StandardPipeline$StandardPipelineValv
> eContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
> org.apache.catalina.core.StandardPipeline.invoke(StandardPipel
> ine.java:4
> > 80)
> > at
> >
> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> > at
> >
> org.apache.coyote.tomcat4.CoyoteAdapter.service(CoyoteAdapter.
> java:223)
> > at
> >
> org.apache.coyote.http11.Http11Processor.process(Http11Process
> or.java:43
> > 2)
> > at
> >
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandle
> r.processC
> > onnection(Http11Protocol.java:386)
> > at
> >
> org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoi
> nt.java:53
> > 4)
> > at
> >
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(
> ThreadPool
> > .java:530)
> > at java.lang.Thread.run(Thread.java:536)
> > root cause
> > java.lang.VerifyError: Cannot inherit from final
> > class
> > at java.lang.ClassLoader.defineClass0(Native
> > Method)
> > at
> >
> java.lang.ClassLoader.defineClass(ClassLoader.java:502)
> > at
> >
> java.security.SecureClassLoader.defineClass(SecureClassLoader.
> java:123)
> > at
> >
> org.apache.catalina.loader.WebappClassLoader.findClassInternal
> (WebappCla
> > ssLoader.java:1664)
> > at
> >
> org.apache.catalina.loader.WebappClassLoader.findClass(WebappC
> lassLoader
> > .java:953)
> > at
> >
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappC
> lassLoader
> > .java:1394)
> > at
> >
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappC
> lassLoader
> > .java:1274)
> > at
> >
> java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
> > at
> >
> org.apache.xerces.impl.XMLNSDocumentScannerImpl.createContentD
> ispatcher(
> > Unknown Source)
> > at
> >
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.(XMLDocu
> mentFragme
> > ntScannerImpl.java:249)
> > at
> >
> org.apache.xerces.impl.XMLDocumentScannerImpl.(XMLDocumentScan
> nerImpl.ja
> > va:245)
> > at
> >
> org.apache.xerces.impl.XMLNSDocumentScannerImpl.(Unknown
> > Source)
> > at
> >
> org.apache.xerces.parsers.IntegratedParserConfiguration.create
> DocumentSc
> > anner(Unknown Source)
> > at
> >
> org.apache.xerces.parsers.DTDConfiguration.(DTDConfiguration.java:367)
> > at
> >
> org.apache.xerces.parsers.StandardParserConfiguration.(Standar
> dParserCon
> > figuration.java:198)
> > at
> >
> org.apache.xerces.parsers.IntegratedParserConfiguration.(Unknown
> > Source)
> > at
> >
> org.apache.xerces.parsers.IntegratedParserConfiguration.(Unknown
> > Source)
> > at
> >
> sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
> > Method)
> > at
> >
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeCo
> nstructorA
> > ccessorImpl.java:39)
> > at
> >
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Dele
> gatingCons
> > tructorAccessorImpl.java:27)
> > at
> >
> java.lang.reflect.Constructor.newInstance(Constructor.java:274)
> > at java.lang.Class.newInstance0(Class.java:306)
> > at java.lang.Class.newInstance(Class.java:259)
> > at
> >
> org.apache.xerces.util.ObjectFactory.newInstance(ObjectFactory
> .java:266)
> > at
> >
> org.apache.xerces.util.ObjectFactory.findJarServiceProvider(Ob
> jectFactor
> > y.java:360)
> > at
> >
> org.apache.xerces.util.ObjectFactory.createObject(ObjectFactor
> y.java:185
> > )
> > at
> >
> org.apache.xerces.util.ObjectFactory.createObject(ObjectFactor
> y.java:120
> >
> === message truncated ==>
>
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