Error in accessing pageContext or current session for JSP/servlet in frames

I am creating a web application on iPlanet application server (ver 6.0 SP4) and display a page
consists of frames in web browser (IE6). The framset and the content of each frames are
JSPs or servlets. There where no problem to display each content frames individually at all.
However, when the overall page (the frame set and the 3 frames) is displayed, the following
problem occurs.
Only the outermost frameset and just one or two of the frame contents displayed successfully
in browser. Others have either 1 of the following errors:
1. When accessing pageContext object in _jspService routine when displaying the JSP page, Null
Pointer Exception occurs:
java.lang.NullPointerException
Exception Stack Trace:
java.lang.NullPointerException
at jsp.APPS.intl.acct_type_option._jspService(acct_type_option.java:653)
2. When calling the req.getSession method in doGet() method for servlets, the following
exception occurs:
Exception in doGet(): This session has already been invalidated
The occurance of error is random among all the frames. With the frame on top or left size
having the most chance to be displayed successfully.
It seems that the Application server cannot entertain 3 or 4 requests simultaneously (which
happens when displayed a page consists of frames), having some of them throw an exception.
Are they any tuning or setting for iPlanet server to overcome this problem?

I'll give you the same advice as I have been given regarding the use of frames.
Don't use them at all. Use scrollable DIV's instead.
The use of frames is such that you would have different JSP's who cannot collaborate together since each is in his own frame and does not know about the others.
In case I'm mistaken, I'd like to hear about it, but the combination of JSP's and frames is an unhappy one.

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Hi Saptak Kulkarni ,
<<<
org.apache.jasper.JasperException: Unable to compile class for JSPNote: sun.tools.javac.Main has been deprecated.
C:\Program Files\SAP Mobile Infrastructure\work\localhost_8080%2FCRMHHSALES\_0002fsystem_0002fError_0002ejspError_jsp_0.java:15: Class com.sap.crm.handheld.logic.gui.Skin not found in import.
import com.sap.crm.handheld.logic.gui.Skin;
^
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import com.sap.crm.handheld.core.utils.EncodingHelper;
^
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import com.sap.crm.handheld.logic.gui.Skin;
^
>>>
Check whether u have imported these classes or not,,
import com.sap.crm.handheld.logic.gui.Skin;
import com.sap.crm.handheld.core.utils.EncodingHelper;
import com.sap.crm.handheld.logic.gui.Skin;
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