CA Spectrum Oneclick webserver runs into memory allocation issue when reading big "client log" data table. Normally to reduce the size of the client log data table, please use the OC administration web page "Client Log" to "Clear Log" function, but this is not possible as the issue comes up again.
The workaround is to delete file named "client.log", saved per each OC-server component install under $SPECROOT/OCLogs.
The file "client.log" is a XML formated ASCII file and should be deleted, when the CA Spectrum OneClick Tomcat service is in stopped state.
After a CA Spectrum OneClick Tomcat service restart the file is create automatically again - now covering new logon info. Now configure the Client Log purge functionality to purge ie. log-entries older then 30 days.