Best Ways to Collect Thread Dumps for WebLogic Server
Overview
Thread dumps are essential diagnostic tools used to troubleshoot performance issues in WebLogic Server, such as:
✅ Server hangs
✅ Deadlocks
✅ Slow-running applications
✅ Database interaction delays
Below is a graphical representation of the different ways to collect thread dumps and their recommended use cases.
1️⃣ Process for Collecting Thread Dumps
📌 Find the Process ID (PID) of the WebLogic Java Process
ps -ef | grep java
📌 Use One of the Following Methods to Collect Thread Dumps
2️⃣ Recommended Methods for Collecting Thread Dumps
🔹 Using JCMD Utility (Preferred for Oracle JDK)
✅ Captures multiple thread dumps at regular intervals
✅ Outputs data into a single file
JDK_HOME/bin/jcmd [JVM pid] Thread.print > wls_thread_dumps.txt
📌 Repeat every 30 seconds to capture multiple dumps
🔹 Using JStack Utility (For Java SE)
✅ Prints Java stack traces for a given Java process
✅ Helps in debugging stuck threads
JDK_HOME/bin/jstack -l [JVM pid] > wls_thread_dumps_jstack.txt
📌 Repeat every 30 seconds for multiple thread dumps
🔹 Using OS Commands (Universal for Linux/Unix/Windows)
✅ Simple method for generating thread dumps
Windows:
<Ctrl> + <Break>
Linux/Unix:
kill -3 <PID>
📌 Output is stored in the WebLogic Server logs
3️⃣ Alternative Methods for Collecting Thread Dumps
🔹 Using WLST (WebLogic Scripting Tool)
✅ Generates thread dumps via WebLogic Console
connect("admin", "password", "t3://localhost:7001")
threadDump()
📌 Stores output in Thread_Dump_AdminServer.txt
🔹 Using WebLogic Administration Console
- Navigate to Servers → Monitoring → Threads
- Click Dump Threads Stack
📌 May produce incomplete thread dumps
Graphical Flowchart: WebLogic Thread Dump Collection Methods
+-------------------------------------+
| Identify JVM Process ID (PID) |
+------------------+-----------------+
|
+----------------------------------------+
| Choose Preferred Thread Dump Method |
+------------------+--------------------+
|
+--------------------------------------------------+
| Recommended Methods for Thread Dumps |
+-------------------+----------------------------+
| JCMD | JStack |
|------------------|----------------------------|
| Fast & Easy | Debugging Stuck Threads |
|------------------|----------------------------|
| Command: | Command: |
| jcmd Thread.print | jstack -l PID |
+-------------------+--------------------------+
+----------------------------------------------+
| Alternative Methods |
+----------------------------------------------+
| - kill -3 <PID> (Linux/Unix) |
| - <Ctrl> + <Break> (Windows) |
| - WLST Script (threadDump()) |
| - WebLogic Admin Console |
+----------------------------------------------+
Final Thoughts
Choosing the right method for collecting thread dumps depends on your platform and debugging needs.
✔ Use JCMD for best results in Oracle JDK
✔ Use JStack for debugging Java thread issues
✔ Use OS commands (kill -3 or Ctrl + Break) for quick and easy thread dumps
✔ Use WLST or WebLogic Console when managing from the WebLogic Admin interface
🚀 Pro Tip: Always collect multiple thread dumps at 30-second intervals for better analysis!
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