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Thread: Java land null point exception

  1. #1
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    Default Java land null point exception

    Hello,

    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() );
    	    	 	if("result".equalsIgnoreCase(row1.getCell(col).toString().trim()))
    				{
    	    	 		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
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    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
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    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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