Categories:
.NET (357)
C (330)
C++ (183)
CSS (84)
DBA (2)
General (7)
HTML (4)
Java (574)
JavaScript (106)
JSP (66)
Oracle (114)
Perl (46)
Perl (1)
PHP (1)
PL/SQL (1)
RSS (51)
Software QA (13)
SQL Server (1)
Windows (1)
XHTML (173)
Other Resources:
Sharing an HttpSession between JSP and EJB
Is it possible to share an HttpSession between a JSP and EJB? What happens when I change a value in the HttpSession from inside an EJB?
✍: FYICENTER.com
You can pass the HttpSession as parameter to an EJB method, only if all objects in session are serializable. This has to be consider as "passed-by-value", that means that it's read-only in the EJB.
If anything is altered from inside the EJB, it won't be reflected back to the HttpSession of the Servlet Container. The "pass-byreference" can be used between EJBs Remote Interfaces, as they are remote references.
While it IS possible to pass an HttpSession as a parameter to an EJB object, it is considered to be "bad practice" in terms of object oriented design. This is because you are creating an unnecessary coupling between back-end objects (ejbs) and front-end objects (HttpSession). Create a higher-level of abstraction for your ejb's api. Rather than passing the whole, fat, HttpSession (which carries with it a bunch of http semantics), create a class that acts as a value object (or structure) that holds all the data you need to pass back and forth between front-end/back-end.
Consider the case where your ejb needs to support a non-http-based client. This higher level of abstraction will be flexible enough to support it.
2007-04-03, 4765👍, 0💬
Popular Posts:
How To Wirte a Simple JUnit Test Class? This is a common test in a job interview. You should be able...
Which one of the following statements is TRUE in regard to overloading the ++ operator? 1 You cannot...
.NET INTERVIEW QUESTIONS - What are Daemon threads and how can a thread be created as Daemon? Daemon...
How do we access attributes using “XmlReader”? Below snippets shows the way to access attributes. Fi...
How To Control Horizontal Alignment? - XHTML 1.0 Tutorials - Understanding Tables and Table Cells By...