Right Jaikoz crashing is a temporary problem with Jaikoz on Mavericks. The story is that with the release of OSX Mavericks it was time to use Java 7 rather than Java 6 on OSX, but unlike Windows Java 6 ->Java 7 transferred control of Java on OSX from Apple to Oracle, and the first few releases of Java 7 on OSX are a bit buggy.
We have had to move Java 8 Pre-release to fix some issues with Java 7 on OSX, but being a prepreease there are a few cracks to iron out, however the full release of Java 8 is due in March, so not long to wait.