However, when I change this to contain an array of errors, I get an exception thrown on the server. For example, this does not work:
Code:

package com.danny;

public class CustomException extends Exception
{
private int[] errorCodes;

public CustomException( String message, int[] errorCodes )

{ super( message ); this.errorCodes = errorCodes; }

public int[] getErrorCodes()

{ return errorCodes; }

}

My deployment descriptors etc. should be fine since I don't change them when I go from the simple example to the one with the array. I just rebuild the generated files using wscompile and redeploy.