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Oracle® Fusion Middleware Understanding Oracle WebLogic Server
12c Release 1 (12.1.1)

Part Number E24446-03
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15 WebLogic Server Compatibility

Oracle attempts to support binary and source-level compatibility between the current version of WebLogic Server and all versions as far back as 9.2 in the areas of persistent data, generated classes, and API compatibility. In some cases, it is impossible to avoid incompatibilities. Where incompatibilities arise, they are fully documented in the Upgrade Guide for Oracle WebLogic Server.

Java EE 6 Compatibility

WebLogic Server 12c Release 1 (12.1.1) is Java EE 6 compatible. This compatibility allows a Java EE 6 compliant application to be developed on one operating system platform, and deployed for production on another, without requiring Java EE 6 application code changes. Oracle ensures this compatibility of Java EE 6 application portability within a WebLogic Server release level.

Generated Classes Compatibility

With one exception, upgrading to WebLogic Server 12c Release 1 (12.1.1) does not require you to recompile applications in order to create new generated classes.

The current version of the EJBGen utility recognizes only JDK 5.0 or later metadata annotation-style EJBGen tags and not the old Javadoc-style tags. This means that source files that use the Javadoc-style tags must be upgraded to use the equivalent annotation, and then recompiled using the updated version of EJBGen.

Compatibility Within a Domain

Persistent Data Compatibility

When moving from WebLogic Server 9.x to 12.1.1, there are changes required to configuration files. Upgrade tooling in WebLogic Server versions 9.0 and later automatically convert the configuration files for you.

API Compatibility

WebLogic Server 9.x, 10.0, and 10.3.x applications deployed on WebLogic Server 12c Release 1 (12.1.1) will function without modification. Exceptions to this rule include cases where API behavior was changed in order to conform to a specification or to fix incorrect behavior. In certain circumstances, a correction may cause your application to behave differently.

Protocol Compatibility

Interoperability between WebLogic Server 12c Release 1 (12.1.1) and WebLogic Server 9.x, 10.0, and 10.3.x is supported in the following scenarios: