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I want to run a Java jar file like this:
java -jar spider.jar How to run it on the background on Windows?
Like this on Linux:
nohup java -jar spider.jar > /var/tmp/spider.log 2>&1 & 
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The only way, in Windows, that you can have a process started by a user continue running after logoff (i.e. what "nohup" does) is to start it either through a "scheduled task" or as a Windows service. When the user logs off all processes in their logon session will be killed.
Nohup, short for no hang up is a command in Linux systems that keep processes running even after exiting the shell or terminal. Nohup prevents the processes or jobs from receiving the SIGHUP (Signal Hang UP) signal. This is a signal that is sent to a process upon closing or exiting the terminal.
If you want your running process to be continued without any interruption, then you need nohup command. Nohup (stands for no hangup) is a command that ignores the HUP signal. You might be wondering what the HUP signal is. It is basically a signal that is delivered to a process when its associated shell is terminated.
By default, that file is located in whichever directory you started the command in. nohup. out is somewhat unique because it contains both the standard output and the error output together. nohup redirects both to the same file by default.
You could use the Windows start command:
start /min java -jar spider.jar This command is not really the same as nohup; but it might be suitable if you're happy with the Java process running in a separate minimised window. See http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/ntcmds.mspx
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