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http://issues.apache.org/bugzilla/show_bug.cgi?id=44041

           Summary: WebappClassLoader duplicate class definition under high
                    Load if hasExternalRepositories is true
           Product: Tomcat 5
           Version: 5.5.25
          Platform: All
               URL: http://www.ubik-ingenierie.com
        OS/Version: All
            Status: NEW
          Severity: critical
          Priority: P2
         Component: Catalina
        AssignedTo: [EMAIL PROTECTED]
        ReportedBy: [EMAIL PROTECTED]


I am using Tomcat Sysdeo Plugin combined with their DevLoader.
This class extends Tomcat WebappClassLoader to add external repositories 
through:
WebappClassLoader#addRepository

Under high load this exception occurs if a Servlet or JSP calls:
                        Class clazz =
Thread.currentThread().getContextClassLoader().loadClass("<Class Name>");


java.lang.LinkageError: duplicate class definition:
com/ubikingenierie/bug/ClassLoadedDynamically
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$100(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at
org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:890)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1329)
        at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1208)
        at com.ubikingenierie.servlet.BasicServlet.service(BasicServlet.java:27)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174)
        at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
        at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
        at 
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:544)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
        at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151)
        at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:874)
        at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
        at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
        at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
        at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
        at java.lang.Thread.run(Thread.java:595)


Philippe.
http://www.ubik-ingenierie.com

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