limpid-kzonix / play-exception-handler

Custom exception handling

play-exception-handler

This is a demo application that demonstrates how you can do advanced error handling with Play.

Running

Run this using sbt.

sbt run

And then go to http://localhost:9000 to see the running web application.

Problem

There are multiple exceptions that will be thrown during apps runtime. There needs to be a mechanism that allows separate classes to handle these exceptions.

Solution

Using HandledBy annotation in combination with ExceptionHandler interface.

All exception handlers must implement ExceptionHandler, like this:

public class FirstExceptionHandler implements ExceptionHandler {
    @Override
    public void handleException() {
        System.out.println("Handling first exception");
    }
}

And the exception must be marked with HandledBy, like this:

@HandledBy(FirstExceptionHandler.class)
public class FirstException extends RuntimeException {
  ...
}