Error 500 when displaying a sevlet

[rodkun]

Hi guys. Please help me on this. Whenever I try to open a servlet in a browser it always display the error 500 and when I am displaying it in the Websphere application or WSAD it will just display "The Website cannot display the page". When I click the "More Information" link it will display "This error (HTTP 500 Internal Server Error) means that the website you are visiting had a server problem which prevented the webpage from displaying.
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I tried restarting the server which is "WebSphere v5.0 Test Environment" but it will still display the same messge.