Question

Do you know some good thread dump analyzer tool? Perfect would be :

• free
• can read a few thread dumps and compare them
• point out which threads took the longest, what are the classes that the thread is locked on etc.
• shows threads, locks, deadlocks and multiple threads waiting to acquire a single lock

Edit:

• offline analyze – load file with one or many thread dump and analyze it.

Edit:
My choice is: Samurai. It has all the features I need: Loads logfile, and compares few thread dumps. Analyze it and points:

• waiting threads
• blocked threads
• blocking threads
• deadlock

I’ll leave question as answered because TDA is the best answer that was given.

Answer 1

You could use TDA – Thread Dump Analyser, a plug-in for Visual VM.

Visual VM is free as well. I think this is your best choice.

If you are on Linux you could use kill -3 to get a thread dump and
look for deadlocks using using Thread Dump Analyzer.

VisualVM now ships as part of the JDK and can be used monitor memory
usage, threads and also includes a profiler.

jmap can be used to obtain heap histograms and heap dumps from Java
processes. You could then use a tool like Eclipse Memory Analyzer to
investigate it.

As another answer mentioned you could look into JMX and JConsole. For
each service in our application we have a MBean so we can view keys
stats such as queue sizes to check if anything seems out of the
ordinary.

From Tools and tips for Sun JVM troubleshooting on ServerFault.