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The below exception, java.lang.IllegalStateExceptio actually thrown by the Session Manager if the session object is INVALID.

Stack Trace:
java.lang.IllegalStateException:
Session Object Internals:
id : B5z1QYCq0E9vRvMhAz1Ghqg
hashCode : 1067073434
create time : Tue Jan 17 09:12:59 GMT 2012
last access : Tue Jan 17 09:13:48 GMT 2012
max inactive interval : 1200
user name : anonymous
valid session : false
new session : false
overflowed : false
app name : CDWeb
non-serializable app specific session data : null
serializable app specific session data : []

at com.ibm.ws.webcontainer.httpsession.SessionData.getValueGuts(SessionData.java:856)
at com.ibm.ws.webcontainer.httpsession.SessionData.getValue(SessionData.java:1262)
at com.ibm.ws.webcontainer.httpsession.SessionData.getAttribute(SessionData.java:1148)
at com.ibm.ws.webcontainer.httpsession.HttpSessionFacade.getAttribute(HttpSessionFacade.java:120)
at org.apache.myfaces.context.servlet.SessionMap.getAttribute(SessionMap.java:47)
at org.apache.myfaces.context.servlet.AbstractAttributeMap.put(AbstractAttributeMap.java:107)
at com.sun.facelets.FaceletViewHandler.getResponseEncoding(FaceletViewHandler.java:426)
at com.sun.facelets.FaceletViewHandler.createResponseWriter(FaceletViewHandler.java:391)

From where do we get IllegalStateException

    SessionData.putValue
    SessionData.getValue
    SessionData.removeValue
    SessionData.isNew
    SessionData.getMaxInactiveInterval

Solution to Illegal State Exception

Basically there are two main reasons this exception:

1. When application invalidates the session and then tries to access it in the same request.
2. When two java threads within the JVM both gets access to the session object and One thread invalidates the session and then the other one thread attempts to use the session object

For example, Check the below code

    HttpSession cdSession = request.getSession();

    The cdSession.invalidate() method is called.

    One of the following methods is called on the session object:
        cdSession.putValue("codedairyTxtString", "is the session invalid");
        cdSession.getValue(codedairyTxtString);
        cdSession.removeValue(codedairyTxtString);
        cdSession .isNew();
        Any other attempted operation on the session object.

Check your servlet or JSP file that threw the exception to determine if the scenario described above applies to your situation and take necessary action.

This happens when two threads within the JVM gain access to the session object and
When one thread invalidates the session and then the other thread attempts to use the session object.

For example
Let’s say our code in Thread1 gains access to the session object by calling

HttpSession exSession= request.getSession();​

And Our Code in Thread2 could gains access to the same session object by calling:

HttpSession exSession= request.getSession();​

Let’s say Thread2 invalidates the session object and then if Thread1 attempts to use the session object by calling one of the following methods:

        mySession.putValue(codedairyTxtString, "is the session invalid");
        mySession.getValue(codedairyTxtString);
        mySession.removeValue(codedairyTxtString);
        mySession.isNew();