Java进程在Linux上崩溃（Ubuntu 14.04）

Question

I have a Java process ran from shell script on Ubuntu 14.04, that crashes abnormally without any visible reason and no logs. The Java program uses Twitter's Userstream API. I've been looking for traces in /var/log but did not find anything that could explicitly point to a problem. Please advise how approach this issue and find any useful log that could indicate the problem. Also, this is my Java version:

Java version "1.8.0_60"
Java(TM) SE Runtime Environment (build 1.8.0_60-b27)
Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

Answer 1

The first step in troubleshooting HotSpot crashes is to locate a crash log, alternatively called fatal error log. By default, these are named hs_err_pid%pid.log , with %pid being the process ID of the crashed VM, and can usually be found in the cwd where the process started. The name and location of said log can also be influenced through the -XX:ErrorFile -VM parameter. Example:

-XX:ErrorFile=/var/log/java/java_error%pid.log .

You can find more information about the crash logs themselves here .

The contents of that log can give an indication on what happened, and where approximately. Be prepared tho, that situations in which a HotSpot crash occurs, are usually not caused by mere bugs in the hosted Java program. An extensive guide to interpreting these crash logs can be found here here .

If no such log can be located after a crash, odds are the VM did not crash, but terminated normally. In that case, a remote debugging session might be in order. Remote debugging is detailed here and also has some topics on SO already.

(There's the very remote chance that circumstances do not permit the log to be written, ie no available file handles during the crash.)

Answer 2

The problem was that my process terminated when I disconnected SSH from the server. In order to run the process in background and prevent process termination when disconnected use 'nohup':

~$ nohup process_name &

I found the answer in this thread .