Use AddError() inside an Apex Class

Question

Is there any way that we can use addError() inside an apex class? I know it will work properly inside a trigger. But i would like to have a separate class for all validations instead writing them inside a trigger.

In the apex code it comes to the line and executes it but neither message will be displayed nor stop saving the record

Thanks, Lahiru

Answer 1

Apex classes have concept of Exception handling. This is similar to all other languages.

You can create an custom Exception class by extending the standard Exception class of the Apex.

You should go through following documentation: An Introduction to Exception Handling

By implementing your own Exception class class whenever you want to interrupt the code simply throw exception as:

throw new MyCustomException(' The Error Message');

Simple Example:

try
{
     // Own exception class extending the standard Exception class.
     throw new MyException('something bad happened!');
} 
catch (MyException e)
{
     ApexPages.Message myMsg = new ApexPages.Message(ApexPages.Severity.FATAL,'my error msg');
     futureCreateErrorLog.createErrorRecord(e.getMessage());
}

If you want to let the error come directly to user interface, do not cover statements with try-catch (this is not recommended).