As SOA Suite is a heavily multi-threaded Java application, where locks are used to synchronize resources. If the threads encounter issues sharing these locks, then the impact on performance can be severe.
jstack is a HotSpot JVM tool that allows you to view thread dumps, which can be a useful way of identifying locking problems in your application.
You will need SOA Suite installed for this recipe, and will need permission to execute the domain control scripts, as well as the JVM tools. This recipe assumes that your SOA Suite application is running, and under a normal load.
jstack are included with the HotSpot JVM. If you're using JRockit, then see the There's more.. section of ...