Make Sure Log Messages Show Up (Programmatically)

Here’s a quick snippet that shows how, using java.util.logging, to ensure that log messages actually show up on your console without the hassle of editing or specifying a logging.properties file somewhere.  This is useful particularly for unit tests featuring the javax.ejb.embeddable.EJBContainer class.

	final Logger topLogger = Logger.getLogger("");
	assert topLogger != null;
	Handler consoleHandler = null;
	final Handler[] handlers = topLogger.getHandlers();
	if (handlers != null && handlers.length > 0) {
	for (final Handler handler : topLogger.getHandlers()) {
	if (handler instanceof ConsoleHandler) {
	consoleHandler = handler;
	break;
	}
	}
	}
	if (consoleHandler == null) {
	consoleHandler = new ConsoleHandler();
	topLogger.addHandler(consoleHandler);
	}
	consoleHandler.setLevel(Level.FINEST);

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ConsoleHandlerActivation.java

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