How to trace a JSP

Question

Is there any way to trace a JSP to determine where it's giving me an error. I get a java.lang.NullPointerException, but I have no idea which part of the code is causing it. Is there any statement I can use to trace where the error occurs?

can you give whole errortrace ? – Hemant Metalia Feb 08 '12 at 10:27 — Hemant Metalia, Feb 08 '12 at 10:27

score 0 · Answer 1 · edited May 23 '17 at 11:48

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Look at these links.

http://www.eclipse.org/webtools/initial-contribution/IBM/evalGuides/ServerToolsEval.html

debug JSP from eclipse

edited May 23 '17 at 11:48

Community

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answered Feb 08 '12 at 10:29

Jayy

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I'm using it with oracle, plsql, etc. so I don't think that will be possible – Superdooperhero Feb 08 '12 at 10:45
using jsp with oracle, plsql? What is your app server to render your jsp? – Jayy Feb 08 '12 at 11:12

score 0 · Answer 2 · answered Feb 08 '12 at 10:30

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Look for the corresponding .java file and set a break point in that at the line throwing the NPE.

A JSP gets compiled to a .java file, before being passed to javac for compilation.

answered Feb 08 '12 at 10:30

npellow

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The oracle process does not seem to keep the .java files. I can find the .class file but not the .java. So no luck there. – Superdooperhero Feb 08 '12 at 11:01
Which Servlet Container are you using ? – npellow Feb 08 '12 at 22:38
Ok - so you need to work out how to ensure that the intermediary .java files are not deleted. This will be setting you can set on the web server. BTW - Apache is not a servlet container. I am not sure what iAS is. – npellow Feb 10 '12 at 07:30

How to trace a JSP

2 Answers2