1. JMAP & JCMD: Memory
The jmap command-line utility prints memory-related statistics for a running VM or core file.
It is suggested to use the latest utility, jcmd instead of the previous jmap utility for enhanced diagnostics and reduced performance overhead
If the jstack pid command does not respond because of a hung process, then the -F option can be used (on Oracle Solaris and Linux operating systems only) to force a stack dump
jmap -F [PID]
source : https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr014.html
2. JSTACK: Threads
The jstack command-line utility attaches to the specified process or core file and prints the stack traces of all threads that are attached to the virtual machine, including Java threads and VM internal threads, and optionally native stack frames. The utility also performs deadlock detection.
If the jstack pid command does not respond because of a hung process, then the -F option can be used (on Oracle Solaris and Linux operating systems only) to force a stack dump
jstack -F [PID]
#OR
kill -3 [PID]
source : https://docs.oracle.com/javase/8/docs/technotes/guides/troubleshoot/tooldescr016.html
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