This is a simple java top (yet another...), using java management api
It's a toy rather than a serious tool, but may be useful sometimes to identify long running threads (eg. busy loops).
Attached bash script makes it easier to use with remote servers. In remote mode it connects through ssh first and then executes the script locally on remote host. Creating an ssh tunnel instead of sending the executable would be simpler, but less fun ;) Besides, I had a very slow ssh connection to the server and it saved a lot of bandwidth...
$ ./jtop --help
Show top threads of a java process, accessing the process through JMX. By default connects to localhost:8686
Usage: ./jtop [-t|-top] [-i|-interval] [-p|-port] [[user@]host]
-t|--top N show top N threads, default 10
-i|-intreval N refresh every N milliseconds, default 10000
-p|--port N JMX port, default 8686
-f|--stackFilter rgxp regexp to filter stack trace - shows first entry matching the regexp (increase maxStack if not found)
-m|--maxStack N number of stack trace elements to load/filter, default 50 if stackFilter is set, 1 otherwise, use less for less overhead
-r|--remote execute remotely, connecting to the host using ssh (useful when JMX port is firewalled or only exposed on localhost)
Examples:
./jtop --maxStack 0
connects to localhost:8686, disables stack
./jtop --stackFilter 'glassfish|org.felix|org.aorzecho'
connects to localhost:8686, looks for given keywords in stacktraces
./jtop -r aorzecho@myhost
ssh to myhost as user aorzecho lnd connect to ocalhost:8686 jvm