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Servlet sessions

Lou Pelagalli
Ranch Hand

Joined: Nov 11, 2003
Posts: 150
    
    1
Hi,

I'm following a tutorial I found and I'm having difficulty saving session information.

Here's the rundown, my code follows my signature.
http://localhost:8080/simpleweb/ParamServlet?param1=World&Param2=Hello
Gets the parameters, displays them, and saves them in the session.
Click on "Click here for target"

simpleweb/TargetServlet
Displays the session information saved in simpleweb/ParamServlet.

TargetServlet behaves as though there is no Session information, just displays this
Information in the session:

Session Exists!


Name: org.apache.catalina.ASYNC_SUPPORTED, Value: null
Done


All servlets appear to link fine so I don't think the problem is in web.xml. I remember to stop and restart Tomcat with each change.

Apache Tomcat 7.0.5 Server
javac -version = "javac 1.6.0_23"

Any help you provide would be greatly appreciated!

Thanks,

Lou


Here's the code
ParamServlet


TargetServlet


web.xml
Prasad Krishnegowda
Ranch Hand

Joined: Apr 25, 2010
Posts: 509


why this code is there in TargetServlet, it doesn't getany request attributes/parameters i guess, from what i see.. so subsequently, control doesn't go inside the while loop..


Regards, Prasad
SCJP 5 (93%)
Abhay Agarwal
Ranch Hand

Joined: Feb 29, 2008
Posts: 1086
    
    1

When you are invoking Target Servlet, there are no parameters in request. All parameters are present in HTTPSession. So get your parameters from session ( not from request)

Just replace



with



in Target Servlet doGet() and you will get your desired result as shown below.

Information in the session:

Session Exists!


Name: Param2, Value: Hello
Name: param1, Value: World
Done


~ abhay

Oracle Java Web Service Developer (1z0-897), Oracle certified Java 7 Programmer, SCJA 1.0, SCJP 5.0, SCWCD 5.0, Oracle SQL Fundamentals I
Lou Pelagalli
Ranch Hand

Joined: Nov 11, 2003
Posts: 150
    
    1
Thank you Abhay!

That was the problem. I copied ParamServlet as TargetServlet and made modifications, but I missed that one.

Spent a long time looking for it. I think the difference between Request and Session is burnt into memory now, and I'll quickly know what to look for (hopefully) if I see this again!
 
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subject: Servlet sessions