output: #fixed code
                               @Test
  	public void testMinusWorkdaysFromFriday() {
  
  		Calendar startDate = Calendar.getInstance();
  		// adjust to FRIDAY
  		startDate.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
  		System.out.println("Startdate=" + startDate.getTime());
  
  		// adjust -3 Workdays -> THUSEDAY
  		Assert.assertEquals(Calendar.THURSDAY,
  				workflowSchedulerService.addWorkDays(startDate, -1).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.WEDNESDAY,
  				workflowSchedulerService.addWorkDays(startDate, -2).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.MONDAY,
  				workflowSchedulerService.addWorkDays(startDate, -4).get(Calendar.DAY_OF_WEEK));
  		// friday - 5
  		Assert.assertEquals(Calendar.FRIDAY,
  				workflowSchedulerService.addWorkDays(startDate, -5).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.MONDAY,
  				workflowSchedulerService.addWorkDays(startDate, -9).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.FRIDAY,
  				workflowSchedulerService.addWorkDays(startDate, -10).get(Calendar.DAY_OF_WEEK));
  
  	}
input: #vulnerable code 
                               @Test
  	public void testMinusWorkdaysFromFriday() {
  
  		Calendar startDate = Calendar.getInstance();
  		// adjust to FRIDAY
  		startDate.set(Calendar.DAY_OF_WEEK, Calendar.FRIDAY);
  		System.out.println("Startdate=" + startDate.getTime());
  
  		// adjust -3 Workdays -> THUSEDAY
  		Assert.assertEquals(Calendar.THURSDAY,
  				WorkflowSchedulerService.addWorkDays(startDate, -1).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.WEDNESDAY,
  				WorkflowSchedulerService.addWorkDays(startDate, -2).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.MONDAY,
  				WorkflowSchedulerService.addWorkDays(startDate, -4).get(Calendar.DAY_OF_WEEK));
  		// friday - 5
  		Assert.assertEquals(Calendar.FRIDAY,
  				WorkflowSchedulerService.addWorkDays(startDate, -5).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.MONDAY,
  				WorkflowSchedulerService.addWorkDays(startDate, -9).get(Calendar.DAY_OF_WEEK));
  		Assert.assertEquals(Calendar.FRIDAY,
  				WorkflowSchedulerService.addWorkDays(startDate, -10).get(Calendar.DAY_OF_WEEK));
  
  	} 
                              #location 13 
                              #vulnerability type NULL_DEREFERENCE