This document discusses how to take thread dumps to troubleshoot Java applications. It describes when thread dumps are useful, such as for poor performance, hangs, or high CPU usage. It explains how to generate thread dumps in WebLogic, Oracle Application Server, and other environments. The document also covers analyzing thread dumps by examining thread states and stacks to diagnose issues like deadlocks, resource contention, and lack of available threads. Case studies demonstrate how to identify and address common problems using thread dumps.