Setting Java Home in Linux

Edit the .bashrc or .bash_profile file and add the below line:

[$] vi .bashrc

export JAVA_HOME="Enter_the_Java_Home_Directory"

e.g: export JAVA_HOME=/app/JDK/jdk1.8

Here is the complete steps:

https://access.redhat.com/documentation/en-US/JBoss_Communications_Platform/5.0/html/Platform_Installation_Guide/sect-Configuring_Java.html

After updating it, just source the file so it would be effective immediately and you could verify with the below command

[$] source .bashrc

[$] echo $JAVA_HOME

Cheers!
Bose

Creating Impersonated User in OBIEE 12c

Here is the steps to create Impersonate Users:

Precheck:
Please create the user in console to which you want to apply impersonator 

Step1:

• From the Weblogic Domain menu, select Security.
• Click Application Policies.

Step2:

• Click Application Policies.
• Click Create to display the Create Application Grant page.

Step3:

• In the Permissions section, click + Add .
• Select Resource Types
• Select oracle.bi.user from the Resource Type list.
• Click Continue to display the Add Permission dialog.
• Enter an asterisk (*) in the Resource Name field and click Next

Step4:

• Select impersonate in the Permission Actions section.
• Click Select.

Step5:

• Now add a new grantee.
• In the Grantee section click + Add to display the Add Principal dialog.

Step6:

• We can choose to grant the newly created permission to either an application role or a user. In this example, we choose a user.
• Select User from the drop-down list.

Step7:

   Here I have selected the user BIImpersonatorUser that I have created in console. 

Cheers!
Bose