JON Server with high CPU usage continuously performing JVM Garbage Collection and eventually failing with OutOfMemoryError: Java heap space

Solution Unverified - Updated -


  • Excessive GC time
  • Server is experiencing out of memory issues and finally down
  • Issue with excessive Garbage Collection (GC) times on our servers
  • Each server is spending 15 to over 40 seconds per minute doing GC
  • GC and CPU usage went up and have both stayed high for a few days
  • CPU is now averaging 40% for server over several hours


  • JBoss Operations Network (JON) 2.4.0, 2.4.1
  • Multiple alert conditions occurring every minute (with or without dampening rules)
  • Depending on number of alerts being evaluated per minute, issue seems to occur within a week to a few months of continued operation

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