CA Web Viewer 12.1 Check & Increase Java Heap Size

Document ID : KB000009663
Last Modified Date : 15/02/2019
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  • Having issues from multiple users unable to access CA OM Web viewer.
  • The web page is loading very slow, partially loading
  • Receive error....CA Output Management Web Viewer r12.1 error.
  • Users "Getting kicked out" of Web Viewer,
  • Getting unpredictable results
  • Seeing error 'java.lang.OutOfMemoryError: Java heap space' in the catalina.out file running Tomcat.
  • Error:  CA DRAS Server is not available for the security check function.

These parameters specify the Memory settings  (Java heap size) when launching Tomcat
ms – the initial heap size when the Java application is starting 
mx – the maximum heap size 

Apache Tomcat

If you are on a Windows server, before you change these settings, check these hardware recommendations for Windows server to make sure that you have enough RAM:
KB000091893 What are 12.1 Web Viewer and Windows Server Hardware requirements? 

Where to find and change these settings:
Web Viewer for Windows with Tomcat running as a Windows Service:
Stop the Tomcat service.
On the command line, go to the <installation dir>/tomcat/bin directory.
Enter the following command: service.bat remove
Open the <installation dir>/tomcat/bin/service.bat file in a text editor.
Locate the following entries and change the numbers to suitable memory values (in MB): 
    --JvmMs 512
    --JvmMx 4096    (or up to 8192) 
Save and close the file.
Enter the following command: service.bat install 

Web Viewer for Windows with Tomcat not running as a windows service:
In apache-tomcat/bin/catalina.bat:

             set "CATALINA_OPTS=-Xms1024m and Xmx2048m...

•Web Viewer for Windows with Tomcat running as Windows service:  In apache-tomcatxxxx\bin\service.bat (for example):

      find "--JvmMs1024


Other Operating Systems:
In apache-tomcat/bin/ 
     CATALINA_OPTS="-Xms1024m –Xmx2048m…" 

Running Tomcat as a started task,

The Java Heap size will be either in your STDENV (parameter) options, or the JCL, wherever your relevant definition is for:
IBM_JAVA_OPTIONS = -Xms256m -Xmx1024m
As noted below, the minimum recommendation for this setting is for:
IBM_JAVA_OPTIONS = -Xms1024m -Xmx4096m
..but if the System does not have that much available, you will get a startup error that notes the Java Heap size nnnnm could not be allocated. If that happens you should lower the -Xmx setting by 512m at a time until the System accepts that setting. If it ends up being at 2048m or lower, you should ask the System Administrators for more to be allocated if possible. 

What Amount to Specify
The amount of memory you specify for the maximum value is dependent on the amount of memory you have available.

  • Xmx4096m is the minimum recommended, and in cases of heavy usage, you may need to increase that to Xmx8192m.

You do not need to change the initial heap size setting even if it is lower than the value above.   


Additional Information:

Monitor the catalina.out file for java.lang.OutOfMemoryError: Java heap space errors to be sure that the setting you specified provides enough heap space.