Whenever I type killall java -9 ,all java process is killed, even if i change the process name. So Is there an way to protect the java process being killed by 'killall java -9'

  • 2
    Making a program that cannot be terminated from command prompt seems kind of...dangerous – Jeffrey Aug 29 '12 at 1:33
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    -9 is SIGTERM, which I believe there is no way to ignore that. And, it is the PROCESS being killed instead of THREAD – Adrian Shum Aug 29 '12 at 1:34
  • @Jeffrey that's what I'm thinking too :/ – PicklishDoorknob Aug 29 '12 at 1:34
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    You could run another (non-Java) process to restart your Java process when it unexpectedly closes. – EthanB Aug 29 '12 at 1:45
  • I think that the best answer is "just don't do it". (Like you wouldn't run "rm -rf" in the root directory!) – Stephen C Aug 29 '12 at 1:49

The simple solution is to run the process with a different user. Then, you (as your current user) would not have permission to kill all processes called java, unless you were root.

I, deltik, do not have a java process running. top shows:

Processes: 80 total, 3 running, 1 stuck, 76 sleeping, 435 threads      21:22:54
Load Avg: 1.66, 1.47, 1.40  CPU usage: 33.49% user, 2.65% sys, 63.85% idle
SharedLibs: 7552K resident, 4480K data, 0B linkedit.
MemRegions: 15059 total, 1858M resident, 32M private, 372M shared.
PhysMem: 298M wired, 2332M active, 1289M inactive, 3918M used, 176M free.
VM: 164G vsize, 1041M framework vsize, 490174(73) pageins, 7225(0) pageouts.
Networks: packets: 1543452/932M in, 1286039/414M out.
Disks: 103231/3309M read, 218839/2343M written.

1159  java         108   02:28:38 45/2 1    somebody
1769  top          4.0   00:10.32 1/1  0    root
765   bash         0.0   00:00.00 1    0    deltik

So this is my output when I try killall -9 java:

Deltik-iMac:~ deltik$ killall -9 java
No matching processes belonging to you were found

I cannot kill a java process owned by somebody.

  • 1
    Nice,+1. @jilen you could also use kill instead of killall to kill only the specific processes that need to go. – terdon Aug 29 '12 at 2:42
  • @terdon there is another script that use killall, I think I should better not change it – jilen Aug 29 '12 at 4:08
  • By run java as another user , I cannot access the home folder of the user. – jilen Aug 29 '12 at 4:09
  • You would presumably know the password of that user, so you could su somebody. – Deltik Aug 29 '12 at 13:05

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