Exception handling in Smart-Cloud framework is implemented based on my article Exception Handling in Real-Life Java Applications published on DZone.com.

Exception Handing Bullet Points:

  1. Always have only one catch statement

  2. Never catch Runtime exception

  3. In the catch statement just call JK.handle(e); the framework will handle the rest.

  4. If you are handling an exception inside method that should return value, it is safe to return null, check the following example.

Example 1:

package com.app;

import com.jk.util.JK;

public class ExceptionExample1 {
	public static void main(String[] args) {
		//Throw nullpointer exception and handle with default handler, which log the error then through runtime exception
		try {
			String name = null;
			name.length();
		} catch (Exception e) {
			JK.handle(e);
		}
	}
}

Custom Exceptions Handling

  1. Create Custom Handler

package com.app;

import javax.swing.JOptionPane;

import com.jk.util.exceptions.handler.ExceptionHandler;
import com.jk.util.exceptions.handler.JKExceptionHandler;

@ExceptionHandler
public class ArrayIndexExceptionHandler implements JKExceptionHandler<ArrayIndexOutOfBoundsException> {

	@Override
	public void handle(ArrayIndexOutOfBoundsException throwable, boolean throwRuntimeException) {
		JOptionPane.showMessageDialog(null, "My ArrayIndexException Handler");
	}

}

  1. Register Handler:

package com.app;

import com.jk.util.JK;
import com.jk.util.exceptions.handler.JKExceptionHandlerFactory;

public class ExceptionExample2 {
	public static void main(String[] args) {
		JKExceptionHandlerFactory.getInstance().registerHandlers("com.app");
		//Throw nullpointer exception and handle with custom handler, which show the message in JOptionPane
		try {
			int arr[]=new int[0];
			int x=arr[1];
		} catch (Exception e) {
			JK.handle(e);
		}
	}
}

For more details, check the DZone article at: https://dzone.com/articles/exception-handling-in-real-life-applications