Hi All,

I just installed the tomcat 5.5.9 and then I add my
program to  upload a file in my server. I set
everything ok from html to my servlet code and I
didn't add any jar or third party file in the library.
But, when I execute my program, sometimes the tomcat
find the HttpServlet and my program works ok and then
the file(only < 400bytes) uploaded to my server. But
most of my attempt the tomcat didn't find the
HttpServlet "see error below". It's a kind a weird
behavior the way the tomcat works.

any idea?

Thanks,
John

javax.servlet.ServletException: Error allocating a
servlet instance
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)

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:856)

org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)

org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)

org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        java.lang.Thread.run(Thread.java:595)

root cause

java.lang.NoClassDefFoundError:
javax/servlet/http/HttpServlet
        java.lang.ClassLoader.defineClass1(Native Method)

java.lang.ClassLoader.defineClass(ClassLoader.java:620)

java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)

java.net.URLClassLoader.defineClass(URLClassLoader.java:260)

java.net.URLClassLoader.access$100(URLClassLoader.java:56)

java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        java.security.AccessController.doPrivileged(Native
Method)

java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        java.lang.ClassLoader.loadClass(ClassLoader.java:306)

sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:268)
        java.lang.ClassLoader.loadClass(ClassLoader.java:251)

org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1247)

org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)

org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:407)

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:856)

org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)

org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)

org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)

org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        java.lang.Thread.run(Thread.java:595)



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