java.lang.OutOfMemoryError: GC overhead limit exceeded [duplicate]

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You’re essentially running out of memory to run the process smoothly. Options that come to mind:

  1. Specify more memory like you mentioned, try something in between like -Xmx512m first
  2. Work with smaller batches of HashMap objects to process at once if possible
  3. If you have a lot of duplicate strings, use String.intern() on them before putting them into the HashMap
  4. Use the HashMap(int initialCapacity, float loadFactor) constructor to tune for your case

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