[Jakarta-cactus Wiki] Update of "GeneralDiscussions/Maven2Migration" by ZhongZheng

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The following page has been changed by ZhongZheng:
http://wiki.apache.org/jakarta-cactus/GeneralDiscussions/Maven2Migration

The comment on the change is:
Added problem and proposals.

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- Discussion about [http://maven.apache.org/maven2  maven 2] migration.
+ This wiki page discusses the [http://maven.apache.org/maven2  maven 2] migration of Cactus.
  
+ ~+ '''Table of Contents''' +~
+ 
+ [[TableOfContents(3)]]
+ 
+ = Problem =
+ 
+ The current Cactus codebase is not maven-friendly. Since Cactus aims to support different versions of servlet spec (2.2, 2.3, 2.4), there are circular dependencies among subprojects, which make the maven migration difficult.
+ 
+ 
+ = Proposals =
+ 
+  * To decouple the subprojects.
+  * To re-organize the project structure in a maven-friendly way.
+  * It will be great if Cactus was intellegent enough to detect automatically the servlet version. Take `HttpServletRequestWrapper` as an example. Maybe we don't need to provide one `HttpServletRequestWrapper` per servlet spec version. We may try to implement a generic `HttpServletRequestWrapper` that supports all versions. For methods which are not supported by the servlet spec (for example, `getRequestURL()` is not supported by version 2.2), just throw out an `UnsupportedOperationException`. Thus we may make a codebase that is cleaner and easier to maintain.
+ 

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