How to disable "Error: Invalid Data" in trigger error message?

Question

I have a trigger in which error message is getting displayed in a standrad page using adderror method.Which gives an error

Error: Invalid Data. Review all error messages below to correct your data.

I want to disable this message and only need to display my customize message.

Is it possible?

Answer 1

Try this

for(Session__c sNew : trigger.new)
{
   sNew.addError('Overlap Session');

}

Answer 2

Use a try/catch block around your DML:

try
{
  upsert someObj;
} catch (Exception e)
{
  ApexPages.addMessage(new ApexPages.Message('some custom message', WARNING);
}

The Syntax isn't 100% correct, but I believe it's somewhat close. If you are already posting messages to your page you should already know what to do.

Answer 3

This is a very simple solution to my question :)

if ( some condition) { String errStr ='Error message'; ac.addError(errStr); }