Installing and Verifying the JDK Version
Oracle WebLogic Server 12.1.3 supports Oracle JDK 1.7.0+ and JDK 1.8.0+ versions. Oracle JDK can be downloaded from the Oracle Software Delivery Cloud at this link:
Note: A plus sign '+' after the fourth
digit in the version number indicates that this and its subsequent versions are
supported.
Caution: For Oracle WebLogic
Server 12.1.3, no version of JDK 1.6.x from any vendor is supported.
To verify your version of an installed JDK, use this command from the command prompt:

Note: Verify the returned
result indicates that a 64-bit version of the JDK is installed. JD Edwards
EnterpriseOne requires that a 64-bit JDK be installed so that the \bin directory of
the JDK is located at the beginning of the PATH variable definition.
Note: You must have a
valid value for the JAVA_HOME in your system path.