Question

I am looking for suggestion on how to handle exception in java in a scenario, where

Class A.test() 
{
    ClassB.test1()
}


test1()
{
   Map listOfExceptions = new HashMap();
   for()
   {
      try{
      }
      catch(custException e){
       // I want the for loop to continue even if there is an exception
       //So I am not throughing now rather adding the exception message to map with 
       //the field name for which for loop is running as key and message as value
      {
   }

// at some point if map has >0 records I want to throw an exception to classA.
}

So the question here is how can I add the Map data to the exception thrown ? basically I need the list of exceptions to be sent to the calling method, as part of exception handling.
Is there a way we can do this ?
It might be a very silly question if the answer is wellknown but I dint find the exact answer anywhere.

Answer 1

Why not just build a List<Exception> as you iterate ? Then upon completion throw a CustomException (derived from Exception) if that list is not empty, and provide the List<Exception> as a field in that CustomException.

You may prefer not to store a List<Exception> but a List<Info> where Info represents the data resulting in the exception. That would likely be more lightweight.

Better still, create an ErrorCollator object that you can add Exceptions to as they occur. Once you’re done, call ErrorCollator.throwExceptionIfReqd(), and that object itself can determine whether to throw the exception (simply, if the List is not empty). That way you have a reusable component/pattern that you can use consistently. Perhaps worth working towards, if not doing immediately.