Put the summary of the bug you're having here

When I open my Bukkit server, I expect it to run properly and not run out of memory. I already looked into it and its not a Bukkit problem. Also, I re-added Java to my system path and dedicated 1.5 GB of RAM to it.

When I open my Bukkit server, I can play on it for a maximum of 5 minutes and then the "Minecraft has run out of memory" screen appears. After this, I have to restart my computer for Minecraft to even load the title screen without the "out of memory" message.

Ummm...... I don't know how to explain this....