How to Set ORACLE_HOME environment variable to [MW_HOME]/jdeveloper directory.
12.2. Checked readme of patch 9905685. find below information.
2 Pre-Installation Instructions
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1. Set ORACLE_HOME environment variable to [MW_HOME]/jdeveloper directory.
2. Shutdown JDeveloper and make sure that the Embedded/Integrated WLS Server is also stopped.
How to Set ORACLE_HOME environment variable to [MW_HOME]/jdeveloper directory.