Error when signing up to my web application java

Question

I have a java web application that allows users to search contents, when i try to sign-up a new user i get the following message!

HTTP Status 500 – Internal Server Error

Type Exception Report

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

java.lang.NullPointerException
    DBConnector.queries.selectUserNamePass(queries.java:30)
    Users.signupS.processRequest(signupS.java:42)
    Users.signupS.doPost(signupS.java:109)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

any one has an idea how to solve it?

*"any one has an idea how to solve it?"* hard to help you without seeing even a bit of code. Are we supposed to guess? — Federico klez Culloca, Oct 01 '20 at 12:20

score 1 · Answer 1 · answered Oct 01 '20 at 12:26

You have:

java.lang.NullPointerException
    DBConnector.queries.selectUserNamePass(queries.java:30)

So open this class. Put a breakpoint on line 30, or before it. Then run your application in debug mode, step by step (F8 key). And you will find what cause NullPointerException.

Error when signing up to my web application java

1 Answers1