Why do I get a null pointer exception in apex?
Critically, here you can see that Line 2 is the problem, and from there deduce that an attempt to de-reference notInstantiated is the probable cause. It would be a waste of time to try to demonstrate all the ways you can get a NullPointerException, as it is one of the most common errors in Apex code. But that is the basic principle.
When to catch an exception in Salesforce apex?
Never just catch Exception, instead catch the specific type of exceptions. For example, QueryException should be caught if you know it’s possible you might not have any records in the query. I commonly use a pattern like this for finding if there’s any associated tasks:
When to call the finally block in apex?
Apex also supports the finally block which is always called regardless of whether an exception has occurred. Finally is usually used to do some cleanup of resources. system.debug (‘Uh oh an error occurred!’); Never just catch Exception, instead catch the specific type of exceptions.
What’s the best way to throw an exception?
Moreover, you can use addError method for only those records that are avaliable in Trigger Context. e.setMessage (‘This is a constructed exception!’); Any implicit exception class can be used to throw a suitable exception. Following is the link to more of exception classes: You need to sign in to do that.
Why does second statement throw null pointer exception?
So how come the second statement to fetch the postal code from Account doesnt throw Null pointer exception but still prints as null. Is this because of the way I query the record??
How to get a null pointer in Salesforce?
To get the additional fields (ie AccountId) you will need to add those to your query. Any fields on records not in the trigger will need to be queried for. You only get the current records direct fields for “free”. Any other record fields on other similar object records or related (parent, child) records will need to be queried for.