bug in managing the office process leads to execution of kill -KILL -1 under linux about jodconverter HOT 2 CLOSED

Duplicate of issue #101

I'm still not clear how it can get to a state where it kills a process that 
wasn't started properly. If you have more details on this please do let me know.

If it is still actual problem - I think it may be helpful to extend code 
provided above.

This problem occurs when jvm or server-process was killed (for example by the 
console - pkill -9 -f java), without stopping soffice process. So, when we 
start it again and OfficeProcess starts -existingPid != PID_UNKNOWN = true, and 
OfficeProcess throws exception in line 67. Because of it - long pid = 
PID_UNKNOWN. And when method forciblyTerminate(..) executes than fires 
processManager.kill(process, -1);
This was said in the first comment.

But if we only retrurns -1 when pid=PID_UNKNOWN, then all of the subsequent 
executions will not work.

So you can do something like this in forciblyTerminate(..) method:

if(pid!=PID_UNKNOWN) {
            processManager.kill(process, pid);
            return getExitCode(retryInterval, retryTimeout);
        } else {
            long blockedPid = processManager.findPid(new ProcessQuery("soffice.bin", unoUrl.getAcceptString()));
            logger.info(String.format("blocking process found: '" + blockedPid));
            if (blockedPid > -1) {
                processManager.kill(process, blockedPid);
            }
            return -1;
        }

I do not know if this is correct decision, but it works for me.