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DOMParser & Cannot Inherit from final class exception

DOMParser & Cannot Inherit from final class exception

2003-03-13       - By Neil Sherman
Reply:     1     2     3     4     5     6  

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
org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappCla
ssLoader.java:1664)
  at
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader
.java:953)
  at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader
.java:1394)
  at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader
.java:1274)
  at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:315)
  at
org.apache.xerces.impl.XMLNSDocumentScannerImpl.createContentDispatcher(
Unknown Source)
  at
org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.(XMLDocumentFragme
ntScannerImpl.java:249)
  at
org.apache.xerces.impl.XMLDocumentScannerImpl.(XMLDocumentScannerImpl.ja
va:245)
  at org.apache.xerces.impl.XMLNSDocumentScannerImpl.(Unknown
Source)
  at
org.apache.xerces.parsers.IntegratedParserConfiguration.createDocumentSc
anner(Unknown Source)
  at
org.apache.xerces.parsers.DTDConfiguration.(DTDConfiguration.java:367)
  at
org.apache.xerces.parsers.StandardParserConfiguration.(StandardParserCon
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(NativeConstructorA
ccessorImpl.java:39)
  at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingCons
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(ObjectFactor
y.java:360)
  at
org.apache.xerces.util.ObjectFactory.createObject(ObjectFactory.java:185
)
  at
org.apache.xerces.util.ObjectFactory.createObject(ObjectFactory.java:120
)
  at org.apache.xerces.parsers.DOMParser.(DOMParser.java:153)
  at org.apache.xerces.parsers.DOMParser.(DOMParser.java:137)
  at xtest.xercestest(xtest.java:22)
  at xtest.init(xtest.java:18)
  at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.jav
a:934)
  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)



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