Migration of Web applications deployed in WebSphere Application Server Version 5.x is usually not necessary; version 2.2 and 2.3 of the Java Servlet specification and version 1.2 and 1.4 of the JavaServer Pages (JSP) specification are still supported unless the behavior was changed in Servlet 2.4 or JSP 2.0 Specifications.
Servlet migration might be a concern if your application:
JSP migration might be a concern if your application references JSP page implementation classes in unnamed packages, or if you install WebSphere Application Server Version 4.x EAR files (deployed in Version 4.x with the JSP Precompile option), in Version 5.x. You need to recompile all JSP pages when migrating from WebSphere Application Server Version 5.x.
JSP migration might be a concern if your application references
JSP page implementation classes in unnamed packages, or if you install WebSphere
Application Server Version 4.0.1 EAR files (deployed in Version 4.0.1 with
the JSP Precompile option), in Version 5.x. You need to recompile
all JSP pages when migrating from WebSphere Application Server Version 5.x.
Follow these steps if migration issues apply to your Web application:
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