Monthly Archives: March 2015


devnexusTaking in a good tech conference like JavaOne, Google I/O, or the WWDC usually means hopping a plane to the Valley for a week.  So it’s nice to know there are a couple of good local (Atlanta) and shorter conferences like DevNexus and GASS / NoFluffJustStuff

A colleague talked me into DevNexus this year, and I’m glad he did. This AJUG-sponsored conference has grown to the caliber and content of much larger conferences, includes tracks much broader than Java, and is well worth the low cost. So if, like me, you can’t usually break away for a week of JavaOne, take in DevNexus or NoFluff instead.


xrebelMy colleagues and I have plenty of Java profilers at our disposal, from the free ones included with every JDK to commercial suites. But while the best tool is the one you’ll use, heavyweight profiling tools often get shoved to the late stages of a project when tuning time is short.

XRebel is a lightweight profiler from our JRebel friends for ongoing use during code development. It doesn’t try to be an end-all monitor; rather, it targets a few of the most common trouble spots in Java web apps: SQL performance, session memory, and exceptions.  Installation is trivial: just add -javaagent to your container’s VM arguments. It injects an iframe to each of your served pages with a dashboard that flags any problems. From there, you can drill into stack traces and SQLs, and view execution counts and times.

I’ve used XRebel with several web apps, and have demo’ed it to others who have become fans. The new 2.0 Beta adds application code profiling, but I’ve encountered some UI hiccups with the initial beta version.  I’m sure those will be fixed fast, and I look forward to the upgrade.

If you haven’t yet tried XRebel, give it a run.  It’s so easy to download and enable, there’s no excuse not to try it.