 | | | DOMParser & Cannot Inherit from final class exception | DOMParser & Cannot Inherit from final class exception 2003-03-13 - By Panos Konstantinidis
Not sure... It could be a class from the XML parser
you are using. What version do you have?
--- Neil Sherman <nsherman@(protected)> wrote:
> 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(StandardWrapper.jav
> > a:962)
> > at
> >
>
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:6
> > 66)
> > at
> >
>
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
> > e.java:214)
> > at
> >
>
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
> > 80)
> > at
> >
>
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> > at
> >
>
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
> > e.java:191)
> > at
> >
>
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
> > 80)
> > at
> >
>
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> > at
> >
>
org.apache.catalina.core.StandardContext.invoke(StandardContext.java:241
> > 5)
> > at
> >
>
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
> > :180)
> > at
> >
>
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
>
org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherVa
> > lve.java:170)
> > at
> >
>
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
> > nvokeNext(StandardPipeline.java:641)
> > at
> >
>
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
> > :172)
> > at
> >
>
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
> > nvokeNext(StandardPipeline.java:641)
> > at
> >
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:4
> > 80)
> > at
> >
>
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995)
> > at
> >
>
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
> > java:174)
> > at
> >
>
org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
> > nvokeNext(StandardPipeline.java:643)
> > at
> >
>
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.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(Http11Processor.java:43
> > 2)
> > at
> >
>
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC
> > onnection(Http11Protocol.java:386)
> > at
> >
>
org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:53
> > 4)
> > at
> >
>
org.apache.tomcat.util.threads.ThreadPool$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
> >
>
=== message truncated ===
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