web client service crashes java.lang.OutOfMemoryError: PermGen space and java.lang.OutOfMemoryError

vSphere web client refused to start with memory errors
log location:

Windows: c:\programdata\VMware\vCenter\Logs\vsphere-client
Appliance: /var/log/vmware/vsphere-client

wrapper.log
	INFO | jvm 1 | 2018/04/03 15:34:25 | Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "org.springframework.scheduling.timer.TimerFactoryBean#0"
	INFO | jvm 1 | 2018/04/03 15:34:33 |
	INFO | jvm 1 | 2018/04/03 15:34:33 | Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "http-bio-9443-exec-10"
	INFO | jvm 1 | 2018/04/03 15:35:12 |
	INFO | jvm 1 | 2018/04/03 15:35:12 | Exception: java.lang.OutOfMemoryError thrown from the UncaughtExceptionHandler in thread "http-bio-9443-exec-6"
	vsphere_client_virgo.log
	[2018-04-03T15:28:45.855-04:00] [ERROR] http-bio-9090-exec-2 com.vmware.vise.util.concurrent.WorkerThread http-bio-9090-exec-2 terminated with exception: java.lang.OutOfMemoryError: PermGen space
	[2018-04-03T15:28:46.773-04:00] [ERROR] http-bio-9090-exec-5 com.vmware.vise.util.concurrent.WorkerThread http-bio-9090-exec-5 terminated with exception: java.lang.OutOfMemoryError: PermGen space

Cause: insufficient  Web-client heap size/Insufficient PermGen space?configuration change

Scenario 1:  Heap-size

Resolution:

• Ensure there is sufficient free memory on the vCenter

free -m

• Review and Increase (double) the heap size of the web client

Appliance:

cloudvm-ram-size -l vsphere-client

windows:

 C:\Program Files\VMware\vCenter Server\visl-integration\usr\sbin\cloudvm-ram-size.bat -l

To increase, use the below

cloudvm-ram-size.bat -C XXX 

• start vsphere-client and observe if this still crashes.

Scenario 2: PermGen

• Take a copy of the file service-layout.mfx as service-layout.mfx.bak
  Appliance path: /etc/vmware/
  Windows Path: C:\ProgramData\VMware\vCenterServer\cfg\
• Edit service-layout.mfx with a text editor
•  Change MaxPermMB size from 256 to 512 for the row vspherewebclientsvc. (increase accordingly depending on the number of plugins configured with vCenter_webclient)
• start vsphere-client service

Scenario 3: Problem persists even after increasing/maxing out scenario 1 and scenario 2.

• backup configuration file before you proceed
  

  cp      /usr/lib/vmware-vsphere-client/server/wrapper/bin/vsphere-client /usr/lib/vmware-vsphere-client/server/wrapper/bin/vsphereclient.bak

• Edit the file using a text editor

vi /usr/lib/vmware-vsphere-client/server/wrapper/bin/vsphere-client

• Look for the line  “RUN_AS_USER=vsphere-client” and hash this
  

Start vsphere-client service.