This question may came up when you try to build a JSR 168 portlet or attempt to open one in JDeveloper 11g R1 PS3. In the latter case what happens is that your portlet gets automatically upgraded to a JSR 286 portlet. Given that JSR 286 supersedes JSR 168, most of the time this doesn’t cause problems. However, if for some reason you HAVE to create or edit a JSR 168 portlet without upgrading it, you’ll need to use a Patch Set 2 or earlier JDeveloper for it (or any other tool supporting JSR 168 portlets).
Despite the fact that JDeveloper automatically upgrades your portlets, deploying JSR 168 portlets to the Fusion Middleware 11g Patch Set 3 is fully supported.
This topic is covered by the Oracle Fusion Middleware Upgrade Guide for Oracle SOA Suite, WebCenter, and ADF:
18.104.22.168 About Upgrading JSR168 Portlet Producers to JSR286
Oracle WebCenter 10g supports Java portlets based on the Java Portlet Specification, JSR 168; Oracle WebCenter 11g supports Java portlets based on Java Portlet Specification version 2, or JSR 286. JSR 286 is an extension of JSR 168, and is backward compatible with JSR 168.
In Oracle WebCenter 10g, Oracle JSF Portlet Bridge is based on and conforms to JSR 301, whereas in Oracle WebCenter 11g, Oracle JSF Portlet Bridge conforms to JSR 329.
In JDeveloper 11g, when you open for the first time an existing portlet producer application containing JSR 168 portlets, portlets are automatically upgraded to be JSR 286 compliant. If the application is a portlet bridge application, it is further automatically upgraded to be JSR 329-compliant.
In most cases, the upgraded portlets continue to work exactly as they did before. However, there are a few cases in which JSR 168 portlets function differently when upgraded to JSR 286; these portlets must invoke a JSR 168 compatibility mode to run under JSR 286.
In Oracle WebCenter 10g, a portlet producer application contains the
oracle-portlet.xmlfiles. When you upgrade a portlet producer application, the
oracle.portlet.xmlfile is deleted, and all its details are moved to
portlet.xml. The navigation parameters stored in
oracle.portlet.xmlare converted into public render parameters and are added to
portlet.xml. For information about how JSR 168 parameters are handled in an upgraded JSR 286-compliant portlet producer application, see Section 16.4, “Migration of JSR 168 Portlet Producers to JSR 286: Handling of Portlet Elements.”