How to solve this error "HTTP Status 500"?

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type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.NullPointerException
org.apache.catalina.manager.HTMLManagerServlet.list(HTMLManagerServlet.java:423)
org.apache.catalina.manager.HTMLManagerServlet.doGet(HTMLManagerServlet.java:161)
javax.servlet.http.HttpServlet.service(HttpServlet.java:743)
javax.servlet.http.HttpServlet.service(HttpServlet.java:856)

note The full stack trace of the root cause is available in the Tomcat logs.

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Apache Tomcat/5.0.14

mythilikumar
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Mar 31st, 2006
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Editorial / Best Answer

Answered by: murali

May 17th, 2006

NullPointer Exception is a typical exception thrown when you tries to set incompatible datatypes without casting them

Showing Answers 1 - 3 of 3 Answers

murali

May 17th, 2006

NullPointer Exception is a typical exception thrown when you tries to set incompatible datatypes without casting them

Saroj

Aug 24th, 2006

I m getting so many times "this" error along with "The server encounter an error() that prevented it from fulfilling this requirement...So would u please tell how to solve this.

Mikin R Patel

Jul 20th, 2011

you r absolutely right bro......Murali
it may sometimes happen that time "When you connect text file to retrieve data from it..sometimes connection could not established or may not open" and can not initialize CONTEXT PARAMETER from file in Servlet programing