Why java.lang.nullpointerexception occurs in jsp

Active 6 years, 6 months ago. Viewed 11k times. This is my jsp page dataTable. JSONArray ; ja. NullPointerException at org. Improve this question. Jens Varun Varun 5, 18 18 gold badges 75 75 silver badges bronze badges.

It will be under work folder if you are running it via tomcat server. Add a comment. Active Oldest Votes. You better put this test : if!

Improve this answer. RPresle RPresle 2, 1 1 gold badge 21 21 silver badges 27 27 bronze badges. I am not using controller class. What is your workflow at the moment. Do you have a form that you validate and come to dataTable. Or do you come on dataTable.

I want to use data table to display data from db so I followed this link datatables. By the way, you should look at HTML 5 which will become the standard.

JSP is quite an old technology now and there are lots of ways to improve what you want to do. Maybe you should consider having a controller to get your data then then forward the data to the JSP. Here is an example in French but code block are in English. Don't forget to accept the answer — RPresle.

Then following code will produce a nullpointer exception. NullPointerException on a jsp page. Ann Enzen. Optional 'thank-you' note:. Hi, I m getting an error when I try to run the jsp below.

NullPointerException] with root cause java. NullPointerException at org. Please let me know the possible causes of this error. Thank You. Vicky Vijay. Check your web descriptor file. Provide your server details..

Server details: Tomcat v7. Stefan Evans. I don't see anything obvious in the jsp you posted that would cause this. Asked 4 years, 6 months ago. Active 4 years, 6 months ago. Viewed 3k times. NullPointerException org. Improve this question. Ahmad Fraz. Ahmad Fraz Ahmad Fraz 49 1 1 silver badge 10 10 bronze badges. Have you checked your logs? Actually, i am new in JSP.

Thanks in Advance. That is nothing specific to JSP, it is generic Java code logic. If getConnection throws an exception it is caught by your catch and prepareStatement is not executed thus selectActors remains null and getActors calls executeQuery on a null instance causing a NullPointerException. Debug your application, see why it throws an exception. Dont catch exceptions that leave your class in a state where it is no longer usable. ServletException: java.