Chris,
        The stack trace at the error moment

requestURI-/TempContext/jsp/QuickLoginAction
Exception-Servlet execution threw an exception
Exception Cause-java.lang.NoClassDefFoundError:
com/XXXXX/hcare/actions/QuickLoginModel
javax.servlet.ServletException: Servlet execution threw an exception
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:313)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
com.xxxxxxxx.hcare.design.RequestContextFilter.doFilter(RequestContextFilter.java:75)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:630)
        at
org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:436)
        at
org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:374)
        at
org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:302)
        at
com.xxxxxxxx.ForwardServlet.yyyyyForward.performAction(yyyyyForward.java:51)
        at
com.xxxxxxxx.ForwardServlet.yyyyyForward.doPost(yyyyyForward.java:32)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
        at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
        at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
        at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
        at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
        at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
        at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
        at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
        at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
        at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
        at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
        at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.NoClassDefFoundError:
com/xxxxxxxx/hcare/actions/QuickLoginModel
        at
com.xxxxxxxx.hcare.actions.QuickLoginActionNew.performAction(QuickLoginActionNew.java:120)
        at
com.xxxxxxxx.hcare.actions.QuickLoginActionNew.doPost(QuickLoginActionNew.java:57)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
        at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
        ... 25 more


Arvind S

"Many of lifes failure are people who did not realize how close they were to
success when they gave up."
-Thomas Edison


On Thu, Apr 14, 2011 at 4:11 PM, S Arvind <arvindw...@gmail.com> wrote:

> Hi Chris/All,
>
>        Actually we are getting
>
> Exception-Servlet execution threw an exception
> Exception Cause-java.lang.NoClassDefFoundError:
>
> We are running tomcat in centos.
> Web app initially running fine, and in the high load time this error is
> happeningo some of the class files randomly.
> Is there any relation between max-open-files in linux
> and NoClassDefFoundError in runtime.
>
>
> Arvind S
>
> "Many of lifes failure are people who did not realize how close they were
> to success when they gave up."
> -Thomas Edison
>
>
> On Mon, Apr 11, 2011 at 8:24 PM, Christopher Schultz <
> ch...@christopherschultz.net> wrote:
>
>> -----BEGIN PGP SIGNED MESSAGE-----
>> Hash: SHA1
>>
>> Arvind,
>>
>> On 4/11/2011 2:04 AM, S Arvind wrote:
>> > Attached the screenshot of the stacktrace for additional details.
>>
>> This list strips most attachments, including screenshots. How about
>> copy/paste the text?
>>
>> To my knowledge, Tomcat will not unload any classes other than possibly
>> JSPs. If you are talking about a standard POJO, then Tomcat should not
>> be interfering with them at all.
>>
>> Are you using RMI or some other process that involves object
>> serialization? If you have mismatched object class versions, you can
>> have weird things like this happen.
>>
>> - -chris
>> -----BEGIN PGP SIGNATURE-----
>> Version: GnuPG v1.4.10 (MingW32)
>> Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/
>>
>> iEYEARECAAYFAk2jFjQACgkQ9CaO5/Lv0PBQswCcCjygCcMGHa2icXbMuW/gPMrH
>> W5IAnjaevcBw4w1dWJqJfch5kOcIJW6Y
>> =3Ndh
>> -----END PGP SIGNATURE-----
>>
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>

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