Ykhjuy

Why is this Exception not being caught?

I read that System.LimitException is not caught but didn't see anywhere about System.FinalException.

Non-Working Code

@AuraEnabled

public static List<RecordType> getRecordTypes() {



    try {



        String sObjectType = 'Task';



        List<RecordType> recordTypes = RecordTypeRepository.getBySObjectType(sObjectType);



        return removeGenericTaskRecordType(recordTypes);



    } catch (Exception e) {



        String message = ErrorMessage.formatExceptionMessage(e, 'There was an error running NewTaskFormController getRecordTypes.');

        System.debug(message);

        throw new AuraHandledException(message);

    }

}





public static List<RecordType> removeGenericTaskRecordType(List<RecordType> recordTypes) {



    RecordType genericTask = RecordTypeRepository.getById(RecordTypeRepository.GENERIC_TASK_ID);



    Integer genericTaskIndex = recordTypes.indexOf(genericTask);



    for (RecordType recordType: recordTypes) {

        recordTypes.remove(genericTaskIndex );

    }





    return recordTypes;

}

What I've Tried

• The same code structure (try-catch) just a different exception and it does get caught.
  "common.apex.runtime.impl.ExecutionException: List index out of bounds: -1
  

Working-Code Example

 public static List<RecordType> removeGenericTaskRecordType(List<RecordType> recordTypes) {



    RecordType genericTask = RecordTypeRepository.getById(RecordTypeRepository.GENERIC_TASK_ID);



    Integer genericTaskIndex = -1;



    recordTypes.remove(genericTaskIndex);



    return recordTypes;

}

Your exception is not being caught because FinalException is not catchable. Neither are LimitException nor AssertException.

You can quickly check for yourself if a given type of exception is catchable using an anonymous script like the following:

try

{

    throw new FinalException();

}

catch (Exception pokemon)

{

    system.debug('Cannot catch em all');

}

Note that in general:

• you should know what specific types of exception you are expecting and catch only those


• it is better to avoid the exception entirely if it is preventable, even if it can be caught

Answer from @Adrian is good, but on a different note the reason why you're getting this error was because your code attempts to modify a collection while it is being iterated in the for each loop, which is not allowed. Read about Read-only Collections

If you need to modify the List or Set while iterating over it, use a
simple for loop with a counter instead of the Set or List iteration.

for (Integer i = accts.size()-1;  i>=0 ; i--) {

    Account a = accts[i];

}