The Currently Running Servlet is showing some Previously run Servlet's Output

The Currently Running Servlet is showing some Previously run Servlet's Output

My question is clearly stated in the Title part of this page. Suppose for example, I have executed the ParameterServlet servlet where the output was Hallo! <1st parameter> <2nd parameter>!

After the above whenever I am executing another different servlet, It is showing the same output. But instead of parameter value it is showing null when a different output should have been shown.

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