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Spectrum Webapp client OutOfMemory heap errors in tomcat log.


Article ID: 237184


Updated On:


CA Spectrum DX NetOps


In the webTomcat catalina.out we see the following errors:

[oneclickwebapp_anonym_2938b5c942b2_1646378038150] Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space

2022-03-04 09:01:55,055 INFO  [Webswing Process Handler] ( [oneclickwebapp_anonym_2938b5c942b2_1646378038150] WARNING: Application is not responding for 10 seconds. Thread dump generated . 


The default WebApp client memory is set at 1GB.  Larger OneClick environments will have a higher demand on webApp client memory.  

In a OneClick environment with over 10,000 active alarms, we see a bases client memory usage of 70% in the GUI.  It can easily spike to greater than 80% which causes the application to dump Java heaps and register errors to the tomcat log, without any performance issue seen by the client.


DX NetOps Spectrum 21.2


For OneClicks with up to 1,500 active alarms, the default should be sufficient.  For larger environments we recommend increasing the maximum webapp client memory to up to 4GB.  This is the maximum that it can be set to.  This does not mean that every client that connects will reserve 4GB each, it is the maximum that it can use.

To increase the memory, change the setting in webswing.config under:


Find the line:

    "vmArgs" : "-Xmx1024m -Djavaws.cfg.jauthenticator=true -DbrowserIp=${clientIp} -Dsun.awt.noerasebackground=true -Duser.timezone=${clientTimeZone}${SPECROOT}/custom/keystore/cacerts",

Change the Xmx setting from 1024m to 4096m:

    "vmArgs" : "-Xmx4096m -Djavaws.cfg.jauthenticator=true -DbrowserIp=${clientIp} -Dsun.awt.noerasebackground=true -Duser.timezone=${clientTimeZone}${SPECROOT}/custom/keystore/cacerts",

Then restart webTomcat:

cd $SPECROOT/webtomcat/bin


Additional Information

TechDocs : DX NetOps 21.2 Spectrum : Memory Requirements for OneClick WebApp Web Server