Blog

Java Thread Dump Analyzer

Analyze thread dumps to identify performance issues and deadlocks



Please select a .txt file generated by the jstack command

Java Thread Dump Analyzer

What is a Thread Dump?

A Thread Dump is a snapshot of the Java virtual machine's threads at runtime, recording the state of all current threads. It's particularly useful for analyzing:

  • 🔍 Thread deadlocks
  • ⚠️ Thread blocking
  • ⏱️ Performance bottlenecks
  • 🔄 Resource contention

How to Get a Thread Dump?

Use the jstack command to capture a thread dump from a running Java program:

jstack [process-id] > thread-dump.txt

Or use the following command to find Java process IDs:

jps -l

Important Information in Thread Dumps

  • Thread States: RUNNABLE, BLOCKED, WAITING, TIMED_WAITING, etc.
  • Thread Names: Reflect the purpose and source of threads
  • Thread Priority: Affects thread scheduling
  • Stack Traces: Show the current execution path of threads
  • Lock Information: Display locks held and waited for by threads

Common Issue Analysis

  • Deadlock Detection: Find threads waiting for each other's resources
  • Resource Contention: Multiple threads waiting for the same lock
  • Thread Pool Analysis: Check thread pool usage patterns
  • Performance Issues: Identify time-consuming operations and blocking points