Feed the Beast

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I launch the server through the terminal like this:
java -Xms1024m -Xmx1024m -jar horizons.jar

and it starts to load up but once it gets to generating the spawning area and the world, it goes
"preparing spawn area 0%
"preparing spawn area 3%
"saving server
"stopping server

and it just stops on its own and doesn't even stop completely, the application stops responding and needs to be forced shutdown.

How can make my server work?