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Thread: Java land null point exception

  1. #1
    Junior Member
    Join Date
    Jun 2017
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    Default Java land null point exception


    I am a beginner of java. I wrote this code. When I run it in eclipse, I get an error: java lang null point exception. It does not tell me which line I have wrong code. Please advise on how to fix it.

                int  TotalCol;
                int  TotalRow;
                TotalCol = 0;
                TotalRow = sheet.getLastRowNum();
                TotalCol = sheet.getRow(0).getLastCellNum();
       	        System.out.println("row " + TotalRow +  " col " +  TotalCol);
                int resultcol = 0;
    	    	for(int col = 0;col<=TotalCol;col++){
    	    	     HSSFRow row1 = sheet.getRow(0);
    	    	     System.out.println("column names " + row1.getCell(col).toString() );
    	    	 		resultcol = col;
    		    	     System.out.println("result column number " + resultcol );
    Last edited by Norm; June 21st, 2017 at 04:51 PM. Reason: HTML tags changed to code

  2. #2
    Join Date
    May 2017
    Eastern Florida
    Thanked 4 Times in 4 Posts

    Default Re: Java land null point exception

    I get an error: java lang null point exception
    Please copy the full text of the error message and paste it here. It has important info about the error that is needed to fix it.

    Please wrap your code in code tags, not html tags.

  3. #3
    Senile Half-Wit Freaky Chris's Avatar
    Join Date
    Mar 2009
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    Thanked 105 Times in 90 Posts

    Default Re: Java land null point exception

    As Norm pointed out we really need the full error log. But at a quick glance, your for loop should probably only have a < symbol, not <=. It's probably causing your to try and retrieve a non existent cell which you are calling toString on.

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