Update: Since lots of people keep asking for it, here's some example code that shows this behavior in action. This can happen for a number of subtle reasons and is often hard to debug and/or fix. It was even worse in many JVM implementations, especially prior to Java 7, because classes and ClassLoaders were allocated straight into permgen and were never garbage-collected at all.)Ī variation on this pattern is why application containers (like Tomcat) can leak memory like a sieve if you frequently redeploy applications which happen to use ThreadLocals that in some way point back to themselves. (The ClassLoader doesn't really play a role in creating the leak, it just makes the leak worse because of this additional reference chain: example class → ClassLoader → all the classes it has loaded. Thread object → threadLocals map → instance of example class → example class → static ThreadLocal field → ThreadLocal object. In this example, the chain of strong references looks like this: But each value is a strong reference, so when a value (directly or indirectly) points to the ThreadLocal object that is its key, that object will neither be garbage-collected nor removed from the map as long as the thread lives.Each key in this map is a weak reference to a ThreadLocal object, so after that ThreadLocal object is garbage-collected, its entry is removed from the map.Ark was a military student under the service of the High Flora military and Gerand Darmoor.During his time in the academy, he befriended Albaire.He and Albaire swore to protect each other, no matter what had happened. Each Thread has a private field threadLocals, which actually stores the thread-local values. He is a Pirate-type class who uses a Knuckle as a primary weapon and Abyssal Path as a secondary weapon.The application clears all references to the custom class or the ClassLoader it was loaded from.ĭue to the way ThreadLocal is implemented in Oracle's JDK, this creates a memory leak:.Allocating the extra memory is optional (leaking the class instance is enough), but it will make the leak work that much faster. new byte), stores a strong reference to it in a static field, and then stores a reference to itself in a ThreadLocal. The class allocates a large chunk of memory (e.g. Level 10-25: Golem’s Temple (Mixed flaming Golems) Level 25-30: Curse Eye ( Ellinia) Level 30-40: Violet Clam Slime.The thread loads a class via an (optionally custom) ClassLoader.The application creates a long-running thread (or use a thread pool to leak even faster).This is due to the fact that the system checks the status of DPI ( eq 9), which is set to 9 every time a batch split happens. Once picking is complete, Auto PGI PPF of the ODO is triggered every single time a picking quantity is confirmed.
Maplestory auto queue for performance how to#
Here's a good way to create a true memory leak (objects inaccessible by running code but still stored in memory) in pure Java: This blog post explains how to deal with Auto PGI being triggered too early in cases of batch splits during picking.
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