java - why jstack not working when the /tmp/.java_pid<num> socket file has been deleted -

usually, use jstack check if java process working normally. while found, when /tmp/java_pid<num> (the num pid of java process) socket file has been deleted, jstack not work. this:

[xxx]$ jstack -l 5509  5509: unable open socket file: target process not responding or hotspot vm not loaded -f option can used when target process not responding 

(ps. didn't want use "-f", there may other problems)

is there way change socket file location(not /tmp)? or generate socket file again when found not existed? did restart java process again, bad solution.

thanks!

/tmp/.java_pid socket used hotspot dynamic attach mechanism. way how jstack , other utilities communicate jvm.

you cannot change path - hardcoded in jvm source code. neither can force jvm regenerate it, because attach listener initialized once in hotspot lifetime.

jstack -f works in quite different way.

in order check whether java process works fine, suggest using jmx remote.