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 | 4 months ago
  1. 0

    OpenNMS - discuss - java.lang.OutOfMemoryError: Java heap space

    nabble.com | 4 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)
  2. 0

    OpenNMS - discuss - java.lang.OutOfMemoryError: Java heap space

    nabble.com | 4 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) > at org.snmp4j.Snmp$PendingRequest.run(Unknown Source)
  3. 0

    OpenNMS - discuss - possible opennms problem

    nabble.com | 11 months ago
    java.lang.OutOfMemoryError: GC overhead limit exceeded > > java.lang.NullPointerException at > org.opennms.netmgt.snmp.snmp4j.Snmp4JWalker$Snmp4JResponseListener.onResponse(Snmp4JWalker.java:157)
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  5. 0

    Java running out of memory on VPS

    Stack Overflow | 3 years ago | user2789433
    java.lang.OutOfMemoryError: Java heap space</p> <p>I don't understand why such an error would occur after hours instead of few minutes if there is a memory leak. I used tools such as VisualVM to observe the behavior of the program and the memory runs constant throughout. </p> <p>Is anyone aware of any ways I can debug this and get to the bottom of this or how to avoid it?</p> <p>Is there a tool that requires no installation and can observe the memory usage of a process over ssh?</p> <p>Edit: There is no stack trace on all the exceptions which is weird. But the error happens in different threads for different classes. </p> <pre><code>at java.io.BufferedWriter.&lt;init&gt;(BufferedWriter.java:104) at java.io.BufferedWriter.&lt;init&gt;(BufferedWriter.java:87)
  6. 0

    Re: OutOfMenoryError in log4j-2.0-beta9

    logging-log4j-user | 3 years ago | Yiru Li
    java.lang.OutOfMemoryError: Java heap > space Exception in thread "pool-2-thread-1" java.lang.NullPointerException at org.apache.logging.log4j.core.async.AsyncLogger.log(AsyncLogger.java: > 223) at org.apache.logging.log4j.spi.AbstractLoggerWrapper.log(AbstractLogger Wrapper.java:55)

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    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