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Problem :

I am new to Servlet programing, while running my Servlet code i am getting bellow error 
error 500 javax servlet servletexception java lang illegalstateexception
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1 Answer

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Solution :

It seems that your Servlets were precompiled for Tomcat,  you will have to clean the project then try to run it again, this should be easy fix for your problem.

Further Readings:

https://github.com/guikeller/jetty-runner/issues/47

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