![]() This error can be easily reproduced by continuously creating java thread objects which will, in turn, create native threads until the system limit is reached. Stack Trace with Native Method: Whenever this error is thrown then it means an allocation failure has occurred during native method execution. One simple solution for this issue will be to check if there is sufficient swap space in your system and increase the same if needed, also monitor the memory used by other processes in the system. Out Of Swap Space Error: This error will occur when by the native method during the because of the failure of allocation of an object. Below image shows a pie chart which shows all the leak suspects. This is a fantastic tool to analyze all the leaked suspects by following the hierarchy of the objects. once you have the heap dump file(*.hprof) you can analyze the same via Memory Analyzer Tool(MAT). You can add this option -XX:+HeapDumpOnOutOfMemoryError in the java arguments which will generate a heap dump after OutOfMemoryError is thrown. One might think that simply increasing the heap space would solve the problem but before doing that one should make sure that all the objects that were present in the memory before the error was thrown were the required objects and not the leaked objects. This usually means that most of the objects in the heap are not ready to be released and the max heap limit is reached. GC overhead limit exceeded: If your java process is spending 98% of the time in the garbage collection and less than 2% memory is released. Now coming back to reasons for the OutOfMemoryError. You have to track those objects which survives after continuous GC events and are not required by the application at that point of time. Similarly once the old generation area limit is reached it will trigger a GC event but in this case, the event is a major GC event which is much more expensive than the minor GC event. Once its size limit is reached it will trigger a minor garbage collection event in which all the objects which don't have any references will be removed from the heap and all the objects that survive after the GC event are passed into the old generation area. This area will keep on taking new objects until its size limit is reached. All new objects being created will initially go to the young generation area. Each area in the heap is alotted different size limits by default which can be overridden by specifying their size before starting the java process. This above image represents different areas in the java heap.
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