Out of Memory Error Minecraft Java

Usually, out of memory errors (and other errors that are similar) is due to your server running out of memory. The cause can be a bit more difficult to determine.

How Does My Server Use Memory and Why Is It Running Out?

Every Minecraft package we sell has a set amount of memory (RAM). The use of plugins will use up this RAM in addition to each user in your server taking up a chunk of that RAM themselves. Thus, if you have many plugins or mods, you may find that the server lagging more or crashes if there are a lot of players online at the same time. You will need to either lower the max player slots on your server, upgrade the RAM of your server, or decrease the amount of plugins or mods on your server.

Using multi-world plugins is notorious for causing out of memory crashes because each world you add uses up quite a lot of memory even if no players are on that world.

Other Causes of Out of Memory Errors

Out of memory errors can be caused by out of date plugins or incompatible plugins with the version of CraftBukkit your server uses. It is always best to ensure that everything on your server is up to date to reduce the chances of this occurring.

Your server can also run out of memory by things in your world such as mobs, lava, water, redstone, pistons, entities etc. These can cause memory leaks and may have to be manually removed.

It is worth nothing that a 100% stable server is nearly impossible to have due to the nature of Minecraft/CraftBukkit servers and plugins