Why is Java consuming 100% CPU on my machine?
I don't know either, but here's how to find out more

In cases of entirely unknown binaries, strings(1) is often helpful in getting a hint about what the file might be

strings /tmp/ics29586 | less


Have a look through the output and see if it's anything familiar.

Failing that, find out which launchd job it is being launched from:

launchctl list|awk '{id=$3; print "### " id; system("launchctl list " id)}'|awk '/^###/ {id=$2} /.*ics29586.*/ {print id}'


This should output one or more job tags in the form of (for example) com.apple.scrod (and a few errors, which you can ignore).

Once you have the job tag(s), get the launchd config for a job by running:

launchctl list com.apple.scrod    # insert your tag instead


This (and the tag itself, which often contains an internet domain name in reverse notation) should give you some more information about what this process is. Feel free to post it here if you need further help.

Update: Forgot to mention this, but since it's a jar file, you can copy it somewhere and unzip it (jar files are really just zip files) and have a look at what sort of Java classes are in there.