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  1. #1
    Stephenmak is offline Member
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    Default Null pointer exception

    Hi all,

    I'm confused with the runtime NullPointerException occured at the arrow line of the following code segment.

    BufferedReader in;
    String line;
    StringBuffer sb = new StringBuffer();
    sb=null;
    byte[] result;
    try {
    FileReader fileReader = new FileReader(this.filename);
    System.out.println("filename is "+this.filename);
    in = new BufferedReader(fileReader);

    do{line=in.readLine();
    if (line != null){
    --> sb.append(in.readLine());}
    }while (line != null);
    String str=new String(sb.toString());
    result = mac.doFinal(str.getBytes());
    System.out.println(filename+" :"+result);
    }

    Please help!

  2. #2
    Fubarable's Avatar
    Fubarable is offline Moderator
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    Default

    The compiler never lies:

    Java Code:
    sb=null;
    construct your StringBuilder before using it, and you should have no problems.

  3. #3
    masijade is offline Senior Member
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    Default

    I'm sorry, but ROFL
    Java Code:
    StringBuffer sb = new StringBuffer();
    sb=null;
    ...
    sb.append(in.readLine());}
    What did you expect?

  4. #4
    kbindumadhavi is offline Member
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    Default

    Comment following line:
    sb=null;

  5. #5
    amt_asc is offline Member
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    Default

    Hi Folks,

    I just joined this Forum ...I am stuck up with a problem related with 2 phase commit in case of Distributed transactions...I have decided to go for JBoss JTA for achieving that..but I am getting two errors XA error -4 and SQL exception 24756...can somebody help me on this ...

  6. #6
    CJSLMAN's Avatar
    CJSLMAN is offline Moderator
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    Default

    amt asc... it is not considered good taste to post on somebody else's post (it's called hijacking). Please start your own post, make sure you're in the correct sub-forum and list all errors (complete stack dumps) along with associated code.

    Luck,
    CJSL
    Last edited by CJSLMAN; 04-01-2009 at 02:26 PM. Reason: typo
    Chris S.
    Difficult? This is Mission Impossible, not Mission Difficult. Difficult should be easy.

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