Error: Null (String Tokenizer)

[yasarqamar]

I have spent quite some time to figure out the null error the compiler returns. I think (though i'm not sure) its because st.nextToken at the end of the line doesnot points to any object. Can anybody suggest how to fix this? Thanks

import java.io.*;
import java.util.StringTokenizer; 
class FileReadEncrypt 
{
 public static void main(String args[])
  {
  try{
  
  // Open and Read the file 
  FileInputStream f1stream = new FileInputStream("Geo Tagger v2_2012-06-28_03-46-08.xml");
  // Get the object of DataInputStream
  DataInputStream in = new DataInputStream(f1stream);
  BufferedReader br = new BufferedReader(new InputStreamReader(in));
  
  Writer output = null;
  File file = new File("SampleTest.xml");
  output = new BufferedWriter(new FileWriter(file));
  
  String strLine = null;
  while ((strLine = br.readLine()) != null)
  {
	  String outputLine1 = "";
	  String outputLine2 = "";
	  StringTokenizer st = new StringTokenizer(strLine, "<>", true);
	  while(st.hasMoreTokens()) 
	  {
		  String key = st.nextToken();System.out.println(key);
		  //String val = st.nextToken();
		  if(key.equals(">") && !st.nextToken().equals("<")){
			  outputLine1 += key;
			  outputLine2 += key;
			  String val = st.nextToken();//System.out.println(val);
			  for ( int i = 0; i < val.length(); ++i )
		  		{
				  char c = strLine.charAt(i);
				  int j = (int) c;
				  int k = j+1;
				  char d = (char) k;
				  outputLine1 += c;
				  outputLine2 += d;
		  		}
		  }
		  //else if(key.equals(">"))
			  outputLine1 += key;
			  outputLine2 += key;
		  //}
	  }System.out.println("yasar");
	  output.write(outputLine2);
	  //System.out.println(outputLine1);
	  System.out.println(outputLine2);
  }
 
  
 
  
  //Close the input and output stream
  in.close();
  output.close();
    }
  
  //Catch exception if any
  catch (Exception e){
  System.err.println("Error: " + e.getMessage());
  }
  }
}

[yasarqamar]

For reference, its the st.nextToken() in line #29

[yasarqamar]

I tried using a check with st.hasMoreTokens() but it didn't resolve the error either

Edit: problem resolved. Should have spent some more time debugging it :)

[Tolls]

What does the code look like with that check, as that is the solution to the problem.

[Tolls]

Oh and:

if(key.equals(">") && !st.nextToken().equals("<")){
...
    String val = st.nextToken();//System.out.println(val);

That first nextToken is lost.
Are you sure you want to do that?

[yasarqamar]

No, i changed my code a little bit and then the earlier check worked. plus i spotted the same error too. but thanks anyways :)