One of my customer just raised a request to investigate Oracle web service performance. They found it is performing slowly.
One of my co-worker bring up a new tools called AD4j, which is also called JADE, Java Application Diagnostics Export.
Found from following blog post that it was a small .war utilities that Oracle bought over by acquiringi a company called www.Auptyma.com.
A Blogspot user shown how he uses this tools to diagnose JPA problem. This utilities require no modification in web application, so it can allow DBA and web developer to perform troubleshooting with simple installation