Differences between J2EE 1.3 and J2EE 1.4

Hello community,
we want to know the main differences between these j2ee-versions for our project at the university. We should implement new advantages of 1.4 in our old program which was developed for j2ee 1.3.
Possible topics could be e.g.: improofed security, faster runtime or decreasing complexity / difficulty in coding.
Maybe you can help us.
Greetings from Germany.
PS: The project we started with j2ee 1.3 was a server/client programm
using a webclient JSP + SessionBean + EntityBean + database

Please follow this link to find out what is new in J2EE 1.4: http://java.sun.com/developer/technicalArticles/J2EE/new1_4/
By the way, the next version Java EE 5 is out which adds a number of things to J2EE1.4. The main theme of Java EE 5 has been "ease of development". Please follow the link to find out what is new in Java EE 5.0: http://java.sun.com/javaee/overview/whatsnew.jsp
Since you are using EJBs, for your convenience I have listed below that new changes to EJB 3.0:
1. Session beans need not have home and component interfaces
2. Session beans need not implement the implement the javax.ejb.EnterpriseBean interfaces.
3. Simplification of APIs for access to a bean's environment: definition of a dependency injection facility and simpler look-up APIs.
4. Introduction of Java metadata annotations to be used as an alternative to deployment descriptors. This means that there is no need for creating ejb-jar.xml and sun-ejb-jar.xml
5. Simplification of object persistence by the definition of a light-weight object/relational mapping facility based on the direct use of Java classes rather than persistent components.

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