public List<BlockChange> getChanges(QueryParams param){
    List<BlockChange> changes = null;
    try {
    changes = logger.getBlockChanges(param);
    } catch (SQLException e) {}
        return changes;
}

QueryParams param = new QueryParams(logger);
param.loc = block.getLocation();
List<BlockChange> placers = getChanges(param);
player.sendMessage(placers+"");


15:43:21 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'mspa
wn' in plugin MobSpawn v1.0
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46)
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:18
6)
        at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:5
02)
        at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.
java:985)
        at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:903)

        at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:858)
        at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
        at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
        at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
        at net.minecraft.server.ServerConnection.b(SourceFile:39)
        at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
        at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
        at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
        at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
        at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
        at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
Caused by: java.lang.NullPointerException
        at de.diddiz.LogBlock.config.Config.getWorldConfig(Config.java:245)
        at de.diddiz.LogBlock.QueryParams.getTable(QueryParams.java:125)
        at de.diddiz.LogBlock.QueryParams.getQuery(QueryParams.java:110)
        at de.diddiz.LogBlock.LogBlock.getBlockChanges(LogBlock.java:268)
        at com.TopicaRP.spenk.MobSpawn.MobSpawn.getChanges(MobSpawn.java:97)
        at com.TopicaRP.spenk.MobSpawn.MobSpawn.onCommand(MobSpawn.java:142)
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
        ... 15 more
>