Need explanation

hi,i have 3 jsp pages a login.jsp, authenticate.jsp and portal.jsp.
authenticate checks the users name and password and if correct forwards to the portal page with details.
so if i am in the portal page, and i hit the back button, and return to the login page, the username field contains the username i entered at the login initally and the password field is blank, if i then hit the login button it forwards to the portal page and contains the data i was just viewing, i.e i dont get my login errors, why is this??its really bugging me
authenticate.jsp<%@ page contentType="text/html" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ page language="java" %>
<jsp:useBean id="checkUser" class="com.jsp.beans.AuthenticateBean" scope="session">
<jsp:setProperty name="checkUser" property="usrName" value="${param.userName}" />
<jsp:setProperty name="checkUser" property="pssWrd" value="${param.psswrd}" />
</jsp:useBean>
<% checkUser.checkUserCredentials(); %>
<c:set var="isValid" value="true" />
<% if(!checkUser.isUserMember()) { %>
<c:set var="loginError" scope="request"
value="Invalid Login, Please Re-enter Your User Name And Password" />
<jsp:forward page="login.jsp" />
<% } else%>
<% checkUser.getPageContentForUser(); %>
<c:set var="fname" scope="request"
value="<%= checkUser.getFirstName() %>" />
<c:set var="lname" scope="request"
value="<%= checkUser.getLastName() %>" />
<c:set var="address" scope="request"
value="<%= checkUser.getAddress() %>" />
<c:set var="points" scope="request"
value="<%= checkUser.getMemPoints() %>" />
<c:redirect url="portal.jsp" />--------------------------------------------------------------------------------------
portal.jsp --><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions" %>
<html>
<body bg="clouds2.jpg">
<c:out value="${fn:escapeXml(fname)}" />
<c:out value="${fn:escapeXml(lname)}" />
<c:out value="${fn:escapeXml(address)}" />
<c:out value="${fn:escapeXml(points)}" />
<jsp:useBean id="checkUser" class="com.jsp.beans.AuthenticateBean" scope="session" />
<% String[] userGifts = checkUser.getGifts(); %>
<%= userGifts[0] %>
<%= userGifts[1] %>
</body>
</html>

<jsp:useBean ...>
//Body
</jsp:useBean>indicates that the Body portion should be executed only when the bean is first instantiated, not everytime the bean is retrieved . And if that bean has session scope, the Body part will be called only once in the session.
In authenticate.jsp, you're setting the user/passwd properties inside the jsp:useBean tag.
This means that those properties will be set only the first time the page is accessed, i.e the first time the checkUser bean is instantiated at session scope.
So you login once, and since it is the first time authenticate.jsp is accessed, the checkUser bean is created and the 2 props user/passwd are set from the request.
You hit the back button. The second time you're coming to authenticate.jsp, the passwd will not be set to the new value (empty), but will keep the value it had the first time, because the checkUser bean has already been instantiated (so the checkUser bean is simply retrieved from the session scope and the jsp:setProperty are not executed).
That first value being valid, the login is valid and you get to the portal page.
So set the props outside of the useBean, i.e :
<jsp:useBean ..../> // close the tag
<jsp:setProperty.../>
<jsp:setProperty.../>

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Please i need explanation...

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I am new to Threads and need an explanation on the
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I executed this program below :
/*================================================
MultiThreadDemo.sqlj
===============================================*/
import java.sql.SQLException;
import java.util.Random;
import sqlj.runtime.ExecutionContext;
import oracle.sqlj.runtime.Oracle;
class MultiThreadDemo extends Thread
double raise;
static Random randomizer = new Random();
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try
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double avgStart = calcAvgSal();
MultiThreadDemo t1 = new MultiThreadDemo(250.50);
MultiThreadDemo t2 = new MultiThreadDemo(150.50);
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double avg;
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MultiThreadDemo(double raise)
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System.out.println(" Executing try block in run() ");
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int updateCount = execCtx.getUpdateCount();
System.out.println("Give raise of "+ raise+"to "+updateCount+" employees");
catch(SQLException e)
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private void delay()
System.out.println(" Executing delay() ");
try
sleep((long)Math.abs(randomizer.nextInt()/10000000));
catch(InterruptedException e)
==========================================================
===========
Output
============
$ java MultiThreadDemo
Executing run()
Executing try block in run()
Executing run()
Executing try block in run()
Give raise of 250.5 to 7 employees
Give raise of 150.5 to 7 employees
Avg Sal Change : 402.0
=============================
Shouldn't the Output be ??:
=============================
executing run()
executing try block in run()
Give raise of 250.5 to 7 employees
executing run()
executing try block in run()
Give raise of 150.5 to 7 employees
Avg Sal Change : 402.0
================================================
Can anyone explain the Output clearly, as I am
new to Using Threads.
Thanks
Sharath

Reply to my own post:
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hai Mr.Venkat,
Tahnks for your reply.
yes i downloaded the "com.sap.portal..layouts.framework.par.bak" only.but i am not using all the jsps available in that.
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{Heap before gc invocations=174:
PSYoungGen      total 9728K, used 9666K [0x18220000, 0x18d30000, 0x24a20000)
eden space 8640K, 99% used [0x18220000,0x18a8fa58,0x18a90000)
from space 1088K, 94% used [0x18a90000,0x18b910f0,0x18ba0000)
to   space 1344K, 0% used [0x18be0000,0x18be0000,0x18d30000)
PSOldGen        total 51200K, used 21113K [0x0ba20000, 0x0ec20000, 0x18220000)
object space 51200K, 41% used [0x0ba20000,0x0cebe540,0x0ec20000)
PSPermGen       total 32768K, used 12611K [0x03a20000, 0x05a20000, 0x0ba20000)
object space 32768K, 38% used [0x03a20000,0x04670fa0,0x05a20000)
26968.748: [GC [PSYoungGen: 9666K->1271K(9920K)] 30780K->22465K(61120K), 0.0025274 secs]
Heap after gc invocations=174:
PSYoungGen      total 9920K, used 1271K [0x18220000, 0x18d50000, 0x24a20000)
eden space 8576K, 0% used [0x18220000,0x18220000,0x18a80000)
from space 1344K, 94% used [0x18be0000,0x18d1dd00,0x18d30000)
to   space 1408K, 0% used [0x18a80000,0x18a80000,0x18be0000)
PSOldGen        total 51200K, used 21194K [0x0ba20000, 0x0ec20000, 0x18220000)
object space 51200K, 41% used [0x0ba20000,0x0ced29e0,0x0ec20000)
PSPermGen       total 32768K, used 12611K [0x03a20000, 0x05a20000, 0x0ba20000)
object space 32768K, 38% used [0x03a20000,0x04670fa0,0x05a20000)
{Heap before gc invocations=23195:
PSYoungGen      total 1536K, used 1372K [0x18220000, 0x18440000, 0x24a20000)
eden space 896K, 100% used [0x18220000,0x18300000,0x18300000)
from space 640K, 74% used [0x183a0000,0x184173e8,0x18440000)
to   space 640K, 0% used [0x18300000,0x18300000,0x183a0000)
PSOldGen        total 6272K, used 4627K [0x0ba20000, 0x0c040000, 0x18220000)
object space 6272K, 73% used [0x0ba20000,0x0bea4d70,0x0c040000)
PSPermGen       total 32768K, used 12930K [0x03a20000, 0x05a20000, 0x0ba20000)
object space 32768K, 39% used [0x03a20000,0x046c0aa0,0x05a20000)
71908.146: [GC [PSYoungGen: 1372K->533K(1536K)] 6000K->5423K(7808K), 0.0107964 secs]
Heap after gc invocations=23195:
PSYoungGen      total 1536K, used 533K [0x18220000, 0x18460000, 0x24a20000)
eden space 896K, 0% used [0x18220000,0x18220000,0x18300000)
from space 640K, 83% used [0x18300000,0x18385438,0x183a0000)
to   space 704K, 0% used [0x183b0000,0x183b0000,0x18460000)
PSOldGen        total 6272K, used 4890K [0x0ba20000, 0x0c040000, 0x18220000)
object space 6272K, 77% used [0x0ba20000,0x0bee6868,0x0c040000)
PSPermGen       total 32768K, used 12930K [0x03a20000, 0x05a20000, 0x0ba20000)
object space 32768K, 39% used [0x03a20000,0x046c0aa0,0x05a20000)
The (relevant) JVM parameters used are as follows :
-server
-Xms600m
-Xss256k
-XX:+UseParallelGC
-XX:+PrintHeapAtGC
-XX:+HeapDumpOnOutOfMemoryError
-Xloggc:verbose_gc.log
-Djavax.net.debug=none
-XX:+PrintGCDetails
-XX:+PrintTenuringDistribution
-XX:+PrintClassHistogram
-Xmx800m
-XX:NewRatio=1
-XX:CompileThreshold=1500
-XX:PermSize=32m
-XX:MaxPermSize=128m
Any help would be welcome.
-R

From what has been looked into further - it appears to be an issue with the threads.
The issue is reproducible if threads are simply created and allowed to run for some time and then complete.
The issue is reproducible on JDK 1.5.14 but not with JDK 1.6.37.
The use of thread pools likely masked the issue leading to the above mentioned gc sample.
Update #1:
A plausible solution for 1.5 as determined is to include '-XX:NewSize' in the parameters (the eden does not reduce below that) however it is not known if this will resolve the issue (memory reclaimed but not accounted for) or if there will be out of memory issues (memory not reclaimed)
Additional links:
https://bugs.openjdk.java.net/browse/JDK-7118202 (Relates to JDK-7 : for possible explanations so as to what can cause it)
https://www.java.net//node/662483

Need explanation/help with NoPermissionException

I recently configured WebLogic 9.2 to run an existing application on my PC. The application consists of a servlet and an EJB all running inside the same WebLogic environment (this is a test enviroment; operationally they would run in separate JVMs.).
I can run a stand-alone "toy" application that can connect and talk to the EJB and get data. I can verify that my web browser can connect to the servlet. However, when the servlet attempts to call the EJB to get data to return to the browser, I get the following exception:
javax.naming.NoPermissionException: User XXX does not have permission on ejb to perform lookup operation.
This particular configuration worked before on WebLogic 8.1.4 on a Unix server.
What does this mean and what do I need to do to get this to work? As you may deduce, I am new to a lot of this so any suggestions or insights you may have would be appreciated.

Did you get any resolution to this one? I am also getting this error and have tried a lot but could not get it working as yet. Does anyone have any clue on why this could be happening?

Need explanation on isUsageThresholdSupported() in jconsole

Hi,
I was looking at the jconsole memory monitoring and managing tool and found that isUsageThresholdSupported() for the edenspace is true, but what I understand from
http://java.sun.com/javase/6/docs/technotes/guides/management/mxbeans.html
is that it should be false. Can you please let me know if what I understand is correct.
Also I would like to know how to conncet to a remote JVM through jconsole, the problem is that I do not know what the port number is on the remote jvm. Is there a way I can get to know what the port number is?
Thanks,
Samanth.

You need to configure your application for remote connection; otherwise you will get connection failure.
http://java.sun.com/javase/6/docs/technotes/guides/management/agent.html describes how to set the port for remote connection.
The complete Java SE Monitoring and Management User Guide is at:
http://java.sun.com/javase/6/docs/technotes/guides/management/
Mandy

Need explanation

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