java.lang.OutOfMemoryError

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    • 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(Unknown Source) at java.util.TimerThread.mainLoop(Timer.java:512) at java.util.TimerThread.run(Timer.java:462)
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