Oracle WebLogic Server Patch Set Update 10.3.6.0.180417 or similar patch was incorrectly installed.
Partial requirements for patch:
1. Minimum JDK version:
Java™ SE Development Kit 8, Update 121 (JDK 8u121)
Java™ SE Development Kit 7, Update 131 (JDK 7u131)
Java™ SE Development Kit 6, Update 141 (JDK 6u141)
2. If you are running with a security manager and experience java.io.SerializablePermission "serialFilter" permission exceptions, then you will need to update the weblogic policy file to include the following line:
permission java.io.SerializablePermission "serialFilter";
in the coherence.jar section of the weblogic policy file:
grant codeBase "file:@WL_HOME/../coherence/lib/coherence.jar"
Once these changes are made to the WebLogic environment:
1. Restart the WebLogic Server
2. Rerecord the Virtual Service using the DevTest Agent.