How Can I Resolve This Problem While Running Web Application Its Getting Null Pointer Exception Or It Is Not Taking Any Parameter From Servlet

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HTTP Status 500 -

type Exception report

message

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

exception

java.lang.NullPointerException
ups.BookslotServlet.doPost(BookslotServlet.java:66)
javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.22 logs.

Apache Tomcat/8.0.22

Posted 29-May-15 0:00am

Member 11725186

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_Asif_ · Accepted Answer · 2015-05-29T00:31:00

NullPointerxception is the most simple exception to track because it simply means you are trying to access member methods/properties of an object which is unfortunately turned to be NULL.

In order to track these errors/exceptions software engineering have established a mechanism which we call LOGGING. There are plenty of free tools available (Log4J for example) which can help you identify a problem in minutes if you have used that tool correctly.

If you really want to be a good developer, you must use LOGGING to track your code activity. This is the best advice one give you if this situation.