setting place of heap memory of Java 1.8

Document ID : KB000127057
Last Modified Date : 14/02/2019
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Using Portal 3.5 with JDK 1.8. 
Want to configure the following java heap in API Portal 3.5 

API Portal 3.5
JDK 1.8
It is possible by the following procedure.

01. edit /opt/Deployments/lrs/server/bin/
02. add the options to the JAVA_OPTS variable in 
03. Restart Portal Service.