捕获未引发的检查异常

Question

I have a code that invokes an external API via EJB and that API occasionally leaks an exception that is not part of the client kit, therefore resulting in ClassNotFoundException .

I have a try-catch block surrounding the call:

    try {
      thirdPartyLibrary.finalInvokeMethod();
    } catch (SomeException exception) {
      //Do something
    } catch(
    ..
    } catch (Exception exception) {
      if (exception instanceof ClassNotFoundException) {
         log.error("....");
      }
    }

I want to avoid using instanceof in catch, but if I add a separate catch clause for ClassNotFoundException , the compiler produces an error "Unreachable catch block", since thirdPartyLibrary.finalInvokeMethod(); doesn't throw ClassNotFoundException .

Is there a better way to address the issue?

Answer 1

I've found a workaround. I've wrapped the thirdPartyLibrary.finalInvokeMethod(); in another method that throws the checked exception. So I got a dedicated catch clause without a compiler error.

private someMethod() {
  try {
    callExternalAPI();
  } catch (SomeException exception) {
    //Do something
  } catch(
  ..
  } catch (ClassNotFoundException exception) {
    log.error("....");
    //Do something
  } catch (Exception exception) {
    //Do something
  }
}

private void callExternalAPI() throws ClassNotFoundException {
  thirdPartyLibrary.finalInvokeMethod();
}