thread-dump

When the Java application is hanging, you don't even know the use case that is leading to this and want to investigate, I understand that thread dumps can be useful. But how can we easily derive useful data from the thread dumps to find where the problem is? The server application that I've been working with produces very long thread dumps, because it is an EJB architecture and thread dumps contains many container threads that I'm not sure I should be looking at (i.e. threads that are not running my application code, but JBoss's code). Yesterday I tried the Thread Dump Analyzer tool. The tool

I am trying to understand more about java, especially about memory management and threads. For this reason I have recently found interest in looking at thread dumps. Here are few lines taken from a web app using VisualVM, a built-in tool for java: "Finalizer" daemon prio=8 tid=0x02b3d000 nid=0x898 in Object.wait() [0x02d0f000] java.lang.Thread.State: WAITING (on object monitor) at java.lang.Object.wait(Native Method) - waiting on <0x27ef0288> (a java.lang.ref.ReferenceQueue$Lock) at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:118) - locked <0x27ef0288> (a java.lang.ref

I have a Java application that I run from a console which in turn executes an another Java process. I want to get a thread/heap dump of that child process. On Unix, I could do a kill -3 <pid> but on Windows AFAIK the only way to get a thread dump is Ctrl-Break in the console. But that only gives me the dump of the parent process, not the child. Is there another way to get that heap dump? rkaganda You can use jmap to get a dump of any process running, assuming you know the pid . Use Task Manager or Resource Monitor to get the pid . Then jmap -dump:format=b,file=cheap.hprof <pid> to get the heap