java.lang.OutOfMemoryError: Java heap space." Could anyone help me understand what is causing this problem and how to remedy this problem? Copy of few lines from "output.log" file. "Executing command: /opt/opennms/bin/runjava -r -- -Dopennms.home=/opt/opennms -Xmx256m -jar /opt/opennms/lib/opennms_bootstrap.jar start Exception in thread "Timer-3411" java.util.ConcurrentModificationException      at java.util.Hashtable$Enumerator.next(Hashtable.java:1020)      at org.snmp4j.Snmp.close(Unknown Source)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker.close(Snmp4JWalker.java:223)      at org.opennms.netmgt.snmp.SnmpWalker.finish(SnmpWalker.java:149)      at org.opennms.netmgt.snmp.SnmpWalker.handleTimeout(SnmpWalker.java:143)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker.access$1000(Snmp4JWalker.java:58)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker$Snmp4JResponseListener.onResponse(Snmp4JWalker.java:163)

nabble.com | 6 months ago
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    OpenNMS - discuss - java.lang.OutOfMemoryError: Java heap space

    nabble.com | 6 months ago
    java.lang.OutOfMemoryError: Java heap space." Could anyone help me understand what is causing this problem and how to remedy this problem? Copy of few lines from "output.log" file. "Executing command: /opt/opennms/bin/runjava -r -- -Dopennms.home=/opt/opennms -Xmx256m -jar /opt/opennms/lib/opennms_bootstrap.jar start Exception in thread "Timer-3411" java.util.ConcurrentModificationException      at java.util.Hashtable$Enumerator.next(Hashtable.java:1020)      at org.snmp4j.Snmp.close(Unknown Source)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker.close(Snmp4JWalker.java:223)      at org.opennms.netmgt.snmp.SnmpWalker.finish(SnmpWalker.java:149)      at org.opennms.netmgt.snmp.SnmpWalker.handleTimeout(SnmpWalker.java:143)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker.access$1000(Snmp4JWalker.java:58)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker$Snmp4JResponseListener.onResponse(Snmp4JWalker.java:163)

    Root Cause Analysis

    1. java.lang.OutOfMemoryError

      Java heap space." Could anyone help me understand what is causing this problem and how to remedy this problem? Copy of few lines from "output.log" file. "Executing command: /opt/opennms/bin/runjava -r -- -Dopennms.home=/opt/opennms -Xmx256m -jar /opt/opennms/lib/opennms_bootstrap.jar start Exception in thread "Timer-3411" java.util.ConcurrentModificationException      at java.util.Hashtable$Enumerator.next(Hashtable.java:1020)      at org.snmp4j.Snmp.close(Unknown Source)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker.close(Snmp4JWalker.java:223)      at org.opennms.netmgt.snmp.SnmpWalker.finish(SnmpWalker.java:149)      at org.opennms.netmgt.snmp.SnmpWalker.handleTimeout(SnmpWalker.java:143)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker.access$1000(Snmp4JWalker.java:58)      at org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker$Snmp4JResponseListener.onResponse(Snmp4JWalker.java:163)

      at org.snmp4j.Snmp$PendingRequest.run()
    2. SNMP4J
      Snmp$PendingRequest.run
      1. org.snmp4j.Snmp$PendingRequest.run(Unknown Source)
      1 frame
    3. Java RT
      TimerThread.run
      1. java.util.TimerThread.mainLoop(Timer.java:512)
      2. java.util.TimerThread.run(Timer.java:462)
      2 frames