Foglight Management Server error "java.lang.OutOfMemoryError: Java heap space" occurs (4246690)

The Foglight Management Server (FMS) is unresponsive or the service is intermittently stopped.

When trying to login to the console or display any dashboard, it can take several minutes to open.

Messages similar to the following appear in the FMS logs ([FMS_HOME]/logs/ManagementServer_yyyy-mm-dd_hhmmss_nnn.log):

FATAL   [http-exec-7] com.quest.nitro.util.DefaultExceptionHandler - An unexpected error occurred which may cause undesired behavior. You may want to contact Quest Software customer support if you see this error again: Unhandled exception in thread "http-exec-7": java.lang.OutOfMemoryError: Java heap space

The java.lang.OutOfMemoryError: Java heap space error on the Foglight Management Server (FMS) occurs when the Java heap allocated to FMS is insufficient for the current workload.

Resolving the issue typically requires increasing the FMS Java heap size.

Ensure the underlying system has sufficient physical memory to support any increase in heap size.

Steps to increase the FMS JVM heap memory:

1. Go to the FMS configuration directory [FOGLIGHT_HOME]/config.
2. Make a backup copy of the configuration file server.config.
3. Edit the existing configuration file (see above).
4. Locate the Java options containing the minimum -Xms and maximum -Xmx heap sizes and update accordingly.

   As an example of allocating 6GB to the JVM heap.

   server.vm.option0 = "-Xms6g";
   server.vm.option1 = "-Xmx6g";

   Note: If the options are not present, they will need to be added and follow the next number in the sequence of VM options.

5. Restart the FMS