Why am I getting "WARNING arguments left: 1"

If you are new to Akka Logging and are used to using Log4j, there is a good chance you will get the error "WARNING arguments left: 1", and not know where its coming from.

So, here it is:

In log4j, you maybe used to writing:

logger.warn("Exception caught: ", e);

This is perfectly valid and works fine. If you use this line in akka logging, you will get the error "WARNING arguments left: 1" because in the case of logback, the syntax assumes it is filling in params from the string, so it expects this:

logger.warning("Exception caught: {}", e);

Hope this will help all of us (including me) not to get caught by this again....

Spring's StringUtils -- Stuff we do with Strings all the time

The other day i was looking for a simple way to take some Strings and automatically capitalize the first character. I stumbled upon Springs StringUtils and as it turns out it has a lot of nice utility functions.

Check them out: http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/util/StringUtils.html

There are many nice simple things that we need to do all the time:

• capitalize (first characters)
• uncapitalize
• Lots of utilities for String arrays -- adding to them, sorting etc

Here is a really nice one: splitArrayElementsIntoProperties

Check them out!