Null pointer exception

[Stephenmak]

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!

[Fubarable]

The compiler never lies:

sb=null;

construct your StringBuilder before using it, and you should have no problems.

[masijade]

I'm sorry, but ROFL

StringBuffer sb = new StringBuffer();
sb=null;
...
sb.append(in.readLine());}

What did you expect?

[kbindumadhavi]

Comment following line:
sb=null;

[amt_asc]

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 ...

[CJSLMAN]

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