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Thread: Null Pointer Exception. How to fix this problem?

  1. #1
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    Exclamation 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.

    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.

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


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    Default Re: Null Pointer Exception. How to fix this problem?

    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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    Default Re: Null Pointer Exception. How to fix this problem?

    Quote Originally Posted by Pratyush View Post
    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.
    Thanks.

    I'll get right on it.

    --- Update ---

    Quote Originally Posted by carbLoading2012 View Post
    Thanks.

    I'll get right on it.
    Wait, what exactly do you mean to print it?

    Here is my code where this is happening
    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 = "";
    				}				
    			}


    --- Update ---

    Alright...

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



    What do I do with this?

    The same thing that was recommended in a previous thread.

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