Oracle9iAS J2EE and Web Cache

Hi!
I'm using Oracle9iAS J2EE and Web Cache on my Sun Solaris 5.8 and when I try to Log on to Oracle Enterprise Manager on port 1810 from my Windows 2000 browser I have this error:
Servlet error: Renderer failed:
java.lang.NoClassDefFoundError
To correct I must do this:
$emctl stop
$emctl start
After that I'm able to log on to OEM but if I do some modifications or wait too long I will received the same error again:
Servlet error: Renderer failed:
java.lang.NoClassDefFoundError
Can you tell me what is the problem ?
Thank's

Do you have the DISPLAY environment variable set correctly? This error is typically seen if the EM Website is unable to connect to an X-Server.

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    Tnx a lot,
    Lokesh

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    Locations, Dates, and registration at:
    http://www.oracle.com/go/?&Src=1587968&Act=43
    Here is what some developers had to say about the events that ran last year:
    http://otn.oracle.com/events/otnworkshop/testimonials.html

    Here are the cities and dates for this developer roadshow. The workshops in Redwood Shores and New York are almost full, the others have more seats available, so check out http://otn.oracle.com/odd and register soon.
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  • J2EE and Web Services Workshops by Oracle and TheServerSide

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    Following the workshop, attendees will be treated to free pizza and beer and will have the opportunity to compete for additional prizes. Experts from TheServerSide will join the session to discuss SOA best practices.
    Oracle Developer Days are free, but space is limited, so register now.
    Locations, Dates, and registration at:
    http://www.oracle.com/go/?&Src=1587968&Act=43
    Here is what some developers had to say about the events that ran last year:
    http://otn.oracle.com/events/otnworkshop/testimonials.html

    Here are the cities and dates for this developer roadshow. The workshops in Redwood Shores and New York are almost full, the others have more seats available, so check out http://otn.oracle.com/odd and register soon.
    Redwood Shores, CA - 4 Aug
    New York, NY - 10 Aug
    Dallas, TX - 12 Aug
    Dearnborn, MI - 17 Aug
    Miami, FL - 19 Aug
    Denver, CO - 24 Aug
    Atlanta, GA - 26 Aug

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