Question

I’m creating a general class that accepts as a parameter a list of exceptions it is willing to handle.

public class MyClass {
  public MyClass (List<Class<? extends RuntimeException>> exceptions) ...
  public execute() {
    try {
      justObj.call()
    } catch(RuntimeException e) {
      if exceptions.contains(e.getClass()) {...}
      else {throw e;}
    }

I want the thrown exception to be the original one I caught, e.g. if it was NullPointerException then I want the throw to be NullPointerException and not RuntimeException as it now.

Any idea how to achieve it ?

Answer 1

It works already:

public static void main(String[] args) {
    try {
            ((ArrayList) null).get(0);
    } catch (RuntimeException e) {
        throw e;
    }
}

throws:

Exception in thread "main" java.lang.NullPointerException
    at Test.main(Test.java:96)