Incompatibilities in the Java EE 5 Platform (since the J2EE 1.4 release)

The Sun Java System Application Server 9 release is based on Java EE 5, Application Server 8 is based on J2EE 1.4, and Application Server 7 release is based on the J2EE 1.3.

Almost all existing programs should run on the Sun Java System Application Server 9 release without modification. However, there are some minor potential incompatibilities that involve rare circumstances and corner cases that we are documenting here for completeness.

• The java.net.Proxy class was added in 5.0, making two classes named Proxy — java.lang.reflect.Proxy and java.net.Proxy. The introduction of java.net.Proxy will cause a source-level incompatibility in existing code if a compilation unit has the following type-import-on-demand declarations:

  import java.lang.reflect.*;
  import java.net.*;

• Java Servlet Specification Version 2.5 ships with the Sun Java System Application Server 9 release, and can be downloaded from the following URL:

  http://java.sun.com/products/servlet/