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From "Martin Gainty" <mgai...@hotmail.com>
Subject Re: "Error allocating a servlet instance" after editing web.xml.
Date Mon, 07 May 2007 23:24:05 GMT
Please display the web.xml for the webapp

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----- Original Message ----- 
From: "Riyaz Shaikh" <riyaz2u@gmail.com>
To: <users@tomcat.apache.org>
Sent: Monday, May 07, 2007 7:07 PM
Subject: "Error allocating a servlet instance" after editing web.xml.


> Problem: If I make any change to my application's web.xml (even as
> small as a single space), I can't access any of Tomcat's
> pages/servlets.
>
> Info to narrow things down (hopefully):
> - I think Tomcat reloads things whenever a change is made to web.xml.
> But I haven't been able to find some good information on this yet.
>
> - The application is located under CATALINA_HOME\webapps. I tried
> creating a context file under conf/catalina/localhost and set
> reloadable="false", but it didn't help.
>
> - Since this problem isn't seen if I edit the web.xml of any of
> Tomcat's example applications, it might have something to do with how
> my application initializes. But nothing shows up in the logs anywhere,
> other than the stack trace I get when I try to access any page. Would
> anyone know which tomcat elements I should enable the debugging info
> for, to get more info about the re-initialization.
>
> - This is the stack trace I get if I try to access anything, after the
> web.xml editing:
>
> exception
>
> javax.servlet.ServletException: Error allocating a servlet instance
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
> org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
> org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
> org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:135)
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:706)
> java.lang.Thread.run(Thread.java:595)
>
> root cause
>
> java.lang.NullPointerException
> org.eclipse.osgi.framework.internal.core.FrameworkProperties.getProperty(FrameworkProperties.java:58)
> org.eclipse.osgi.framework.internal.core.FrameworkProperties.getProperty(FrameworkProperties.java:51)
> org.eclipse.osgi.framework.util.SecureAction.getProperty(SecureAction.java:49)
> org.eclipse.osgi.framework.internal.protocol.StreamHandlerFactory.createURLStreamHandler(StreamHandlerFactory.java:85)
> java.net.URL.getURLStreamHandler(URL.java:1104)
> java.net.URL.<init>(URL.java:393)
> java.net.URL.<init>(URL.java:283)
> java.net.URL.<init>(URL.java:306)
> java.io.File.toURL(File.java:594)
> org.apache.catalina.loader.WebappClassLoader.getURL(WebappClassLoader.java:2292)
> org.apache.catalina.loader.WebappClassLoader.findResourceInternal(WebappClassLoader.java:1966)
> org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1749)
> org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:866)
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1319)
> org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1198)
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
> org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
> org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
> org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:135)
> org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:706)
> java.lang.Thread.run(Thread.java:595)
>
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> 


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