I have spent almost 8 hours trying to figure out why my test class isn't working but to no avail. I have simplified and de-bulkfifed the test class to insert only 1 record each for the relevant objects and it still doesn't work. My trigger is the culprit and I can't debug why it isn't allowing my test class to run. The issue occurs when my test class tries to create a case.

I fail to understand that why I can't insert a simple case using my test class. Why is my apex trigger isn't allowing it? Any input would be much appreciated!

Main trigger: It will prevent each user from creating more than certain cases in the current month (Specified by custom setting- MaxCases ). The trigger runs fine and does what it's supposed to do on the UI.


trigger LimitCases on Case (before insert) {

//Extract the custom setting value into a variable
Max_Cases__c maxCase = Max_Cases__c.getInstance('maxcasesetting');
Integer maxNoCases   = Integer.valueof(maxCase.MaxCases__c);

    System.debug('The max no. of cases setting is:' + maxNoCases);

/*1. Create a set of all Owner Id's whose cases are being fed for import
     Also, Add all userIds to a map with 0 number of cases as initial values */

if(maxNoCases!=null) {
Map<Id,Integer> ownerCasesMap = new Map<Id,Integer>();
Set<String> ownerIds = new Set<String>();

    for(Case newCase: Trigger.new) {
            System.debug('Creating a set of Owner Ids');


/*2. Create a user Map just to obtain the Owner Name using their Id
     Salesforce doesn't allow doing Owner.name for some incomprehensible reason! */

       Map<Id,User> userMap = new Map<Id,User>();
       List<User> userM =[SELECT Id, Name FROM User WHERE Id IN: ownerIds];
       for(User ownerUser:userM) {
       userMap.put(ownerUser.Id, ownerUser);

     //3. Use AggregateResults to get a count of all Cases pertaining to the           above owners

System.debug('Creating a list of grouped results[AggregateResults] now');
List<AggregateResult> groupedResults= [SELECT OwnerId , count(Id) FROM Case
                                       WHERE OwnerId IN:ownerIds 
                                       AND CreatedDate= THIS_MONTH     
                                       GROUP BY OwnerId];

//4. Use the previously created Map to store Owner Id and the number of Cases from above

for(AggregateResult countCase: groupedResults) {

System.debug('Entered the AggregateResult For loop');

    if(countCase!=null) {     

    System.debug('Owner Id:' + countCase.get('OwnerId'));
    System.debug('Count is' + countCase.get('expr0'));

    //Map now has key-> Owner Id, value-> Case count
    //This will replace the owners previous put in the Map with new values and not put anything for NULL
    //This way users who didn't create any cases this month are retained in the previously created map

   ownerCasesMap.put((Id)countCase.get('OwnerId'), (Integer)countCase.get('expr0'));

   //Go through every Case being inserted , find the case count from above and compare to maxCases

   for(Case newCase: Trigger.new) {

       System.debug('Entered the main Case Trigger.new!');

       //Get the number of cases associated with the Owner Id of this case    
       Integer numCases  = ownerCasesMap.get(newCase.OwnerId);

       System.debug('Number of Cases created so far by this owner:'+ numCases);

       //Do not allow the user to create a case if the limit is reached
       if(numCases>=maxNoCases) {
       System.debug('Entered the if loop in order to show the error since numCases>=maxNoCases' );
       newCase.addError('Too many cases created this month for user' + ' ' + userMap.get(newCase.OwnerId).Name + '(' + newCase.OwnerId + '):' + ' ' + maxNoCases);

           else {
           System.debug('Entered the else loop in order to let the user create the case' );

           ownerCasesMap.put(newCase.OwnerId, ownerCasesMap.get(newCase.OwnerId) + 1);
           System.debug('Number of cases for this owner has been incremented in the map' );
           System.debug('Number of cases for this owner: ' + userMap.get(newCase.OwnerId).Name + 'is: ' +ownerCasesMap.get(newCase.OwnerId));



      System.debug('Case has been inserted' );

**Test class*:*

Error Message System.DmlException: Insert failed. First exception on row 0; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, LimitCases: execution of BeforeInsert caused by: System.NullPointerException: Attempt to de-reference a null object Trigger.LimitCases: line 5, column 1: []

Stack Trace Class.TestLimitCases1.testLimitCases1: line 49, column 1

Line 49 is where I do insert newCase;

Line 5, column 1 is Integer maxNoCases = Integer.valueof(maxCase.MaxCases__c);

  public class TestLimitCases1 {
  static testMethod void testLimitCases1() {

//Principle #1: Create records from scratch

//1. Create the custom setting 

Max_Cases__c maxcasesetting = new Max_Cases__c();
maxcasesetting.MaxCases__c  = 10;
maxcasesetting.Name         = 'maxcases';
insert maxcasesetting;
System.debug('Max number of cases:' + maxcasesetting.MaxCases__c);

//2. Insert 1 user

User owner= new User();
owner.Alias = 'sriv123';
owner.UserName = '[email protected]';
owner.CommunityNickname = 'mangu';
owner.Email ='[email protected]';
owner.TimeZoneSidKey    = 'GMT';
owner.LocaleSidKey      = 'en_US';
owner.EmailEncodingKey  = 'UTF-8';
owner.LanguageLocaleKey = 'en_US';

  insert owner;

   System.debug('Inserted users Id is: ' + owner.Id);

  //3. Insert Case

   System.runas(owner) {

      Case newCase          = new Case();
      newCase.Subject       = 'Issue';
      newCase.Description   = 'Issue Description';
      newCase.Status        = 'Open';

  //  try {
      insert newCase;
   //   } catch (Exception e) {
    //      System.debug('Why is this happening?');
    //      }

   //Principle #2: Test things that should work

     Integer newCasesu1Count = [SELECT count() FROM Case];
     System.assertEquals(1, newCasesu1Count);

   //Principle #3: Test things that shouldn't work

      Case newCase1          = new Case();
      newCase1.Subject       = 'Issue';
      newCase1.Description   = 'Issue Description';
      newCase1.Status        = 'Open';

      insert newCase1;

      Integer newCount = [SELECT count() fROM Case];
      System.assertEquals(10, newCount);


  • did you give an attempt by putting @isTest(SeeAllData=true) .
    – Suresh
    Mar 3, 2015 at 21:18

1 Answer 1


It looks like the null pointer exception is from your custom setting. In your trigger, you have maxcasesetting as the setting name, while in the test class you are using maxcases. Change your test class to use maxcasesetting and it should work better.

  • 1
    Thank you Sire! I can't thank you enough for helping me with something that I had spent so much time on. Gracias!! Mar 3, 2015 at 21:37
  • You're most welcome! You can use the 'tick' to 'accept' the answer, though there might be a minimum amount of time the question has to be open.
    – metadaddy
    Mar 3, 2015 at 21:46

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