The tomcat log file (Windows=stdout.log / Linux=catalina.out) in $SPECROOT/tomcat/logs folder grows quickly. The following message is shown frequently in the tomcat log file:
org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [/spectrum] threw exception [java.lang.NullPointerException] with root cause
java.lang.NullPointerException
LoadBalancer managing Spectrum OneClick Servers
Removing or altering this check is avoiding the exception message. For example this health check is not creating the log entries but is still checking if the OneClick Server is alive:
GET /spectrum/admin/index.jsp HTTP/1.1\r\nHost: localhost\r\nConnection: Close\r\n\r\n