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I would suggest you to have a look at the below links which would surely help and also would give you a better idea how to avoid such situations.
Topic: WebLogic Heap Dump Genration Using Jmap
Topic: Heap Dump Using Jhat for WebLogic Server Heap Analysis
Topic:OutOfMemory Causes and First Aid Steps?
Topic: Causes and First Aid of JVM Crash Issues?
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This options works only when we restart the server and again when the server goes out of memory we can get the heapdump as per the arguments which you mentioned.
But how to collect a heapdump of a server which ran out of memory and which did not have those arguments of "-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath="