See full tutorial here : https://cedricleruth.com/how-to-fix-jbo-27200-jndi-failure-unable-to-lookup-data-source-in-oracle-adf/

OracleADFfixJbo27200.xml

<!-- In Oracle ADF, To fix JBO-27200: JNDI failure. Unable to lookup Data Source 
you need to ensure that your datasource name is the same in 3 places:
Note : This is case sensitive.
-->

<!-- In web.xml -->
<resource-ref>
  <res-ref-name>jdbc/YOUR_DATASOURCE_NAME</res-ref-name>
  <res-type>javax.sql.DataSource</res-type>
  <res-auth>Container</res-auth>
</resource-ref>

<!-- In your Model project Application Module > Configurations > Configuration File : -->
<Custom JDBCDataSource="java:comp/env/jdbc/YOUR_DATASOURCE_NAME"/>

<!-- In your weblogic console > Services > DataSources > Configuration > General > JNDI Name : -->
jdbc/YOUR_DATASOURCE_NAME