Passing parameter from custom java application to birt report viewer(WebViewerExample)

Hi, 
 
i have put the whole WebViewExample war-files in a spring application, and changed the web.xml file and so on.. Now i can deploy the whole thing as one web application. And use spring security on urls. 
 
I have a dashboard in my application, where i have used iFrames to show different reports. Works good. 
 
But now i want to pass a string parameter from my spring application to birt report viewer, as i want to send the loggedin-username to the birt report when a report is called. I dont want to set the username as an GET-parameter to the report, as the users then can see in the html-code and change the username-variables to fake their userids. I dont want to use this: 
<a class='bbc_url' href='http://localhost:8080/reports/run?__report=report/test.rptdesign'>http://localhost:8080/reports/run?__report=report/test.rptdesign</a>&username=myusername 
 
(I dont neither want to use the taglib option to specify the report in my jsp, as i i love the ajax functionality and the "please wait"-message when the report is loading.) 
 
How can i set the username/variables in the report-viewers applicationcontext/reportcontext or session (or any other ways for that matter?) from a custom java application/jsp? 
 
in the report viewer, i want to catch this userid-variable, to do further processing and validate. I was thinking catching the variable in for example the "onPageStart". Is this possible ? any example. 
 
i really appreciate all help.

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CBR

If the webviewer is part of your web application war you can simply add a session variable to the HTTPSession (there should a a open session anyways).

In BIRT initialize you can grab the session variable with script

reportContext.getHttpServletRequest().getSession().getAttribute("myVariableName)

This is the easiest way to do it. If you want seamless integration you need to integrate the viewing mechanism deeper into your application by writing your own viewer.

shazia

great Cbrell, i have been trying to find example scripts, can i ask another question: 
 
i need to access the session-attribute to set my max-limit, in my data set, as i have specified this sql: 
<pre class='_prettyXprint _lang-auto _linenums:0'>
select productname, sum(transamount)
from agg_trans
group by productname
limit 0,?
</pre>
 
if i set a "Data"-column item, i can see the value by choosing "Java Object" and expression: <pre class='_prettyXprint _lang-auto _linenums:0'>reportContext.getHttpServletRequest().getSession().getAttribute("max-limit")</pre>
 
but if i create a "new parameter" and "Java Object" as "Data Type", the limit does not get set by my parameter ? 
 
 
- another question: 
how can i stop a report running, if i have a condition in a script ?

CBR

What's the type of max-limit at the time you put it into the session? Is it a integer? If yes you should choose integer as the datatype.

Query parameter can only be of a native type.

What do you mean by stopping the report? Do you want to throw an exception to abort the process?

shazia

great help cbrell. 
 
yes the integer-definition fixed the problem

yes with stopping the report i mean aborting it. 
 
 
<blockquote class='ipsBlockquote' data-author="'cbrell'" data-cid="107590" data-time="1343315101" data-date="26 July 2012 - 08:05 AM">
What's the type of max-limit at the time you put it into the session? Is it a integer? If yes you should choose integer as the datatype. 
 
Query parameter can only be of a native type. 
 
What do you mean by stopping the report? Do you want to throw an exception to abort the process? </blockquote>