Hi, I've updated my server's spigot version from build #879 to #934 and also have updated a plugin I'm developping at about the same time, so I'm wondering what exactly is the cause of the problem. From time to time, the server seems to stop completely from responding and simply crashes. There is only a Thread Dump (http://pastebin.com/K4Ccq12Q) and no crash report. I have to kill the process and restart it. The active plugins on it are : NoSpawnChunks v0.3 de.bananaco.nospawnchunks.NoSpawnChunks [codename_B] PTweaks v6.0.5 me.devplugin.ptweaks.PerformanceTweaks  There is also my plugin I have developped. It contains an HSQLDB and a VertX server (which is using io.netty), so it might be a netty conflict or the HSQLDB (though, my plugin has been running with the HSQLDB for a while without any issues and only recently did I put the VertX server with WebSocket connections). It is running on a Raspberry Pi if it can help... Thanks!