Null Pointer Exception. How to fix this problem?

I'm a newbie coder, programmer, computer science student.

My project just received this error called null pointer exception.

Code :

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java.lang.NullPointerException
	servlet.AddRewardsPages.doPost(AddRewardsPages.java:119)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
 
 
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.34 logs.

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How to get rid of this, so that my project works well?

Go to line number 119 (as clearly mentioned in the stacktrace) of your servlet class named AddRewardsPages.java and check for the variable in that line which is used. That variable must be null. Try printing the variable and run the application again so as to see what it is returning.

Quote:

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Originally Posted by Pratyush

Go to line number 119 (as clearly mentioned in the stacktrace) of your servlet class named AddRewardsPages.java and check for the variable in that line which is used. That variable must be null. Try printing the variable and run the application again so as to see what it is returning.

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Thanks.

I'll get right on it.

--- Update ---

Quote:

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Originally Posted by carbLoading2012

Thanks.

I'll get right on it.

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Wait, what exactly do you mean to print it?

Here is my code where this is happening

Code :

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if (valid) {
 
					Reward reward = new Reward(new Integer(pledgeAmount), rewardDescription, request.getSession(true).getAttribute("USER").toString());
 
			Line	119. -->  project.addReward(reward);
 
					request.getSession(true).setAttribute("PROJECT", project);
 
					pledgeAmount = "";
 
					rewardDescription = "";
				}				
			}

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--- Update ---

Alright...

I received the error on a different part of the application...

Code :

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ava.lang.NullPointerException
	servlet.Projects.doGet(Projects.java:171)
	servlet.Projects.doPost(Projects.java:201)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
	servlet.AddReward.doPost(AddRewardsPages.java:68)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:722

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What do I do with this?

The same thing that was recommended in a previous thread.