Null returned from request.getSession( true )

It is my understanding that when you call getSession on an instance of
          HttpServletRequest with a parameter of true, it should return the existing
          session (if there is one) or a new session. It should never return null.
          Unfortunately, that is exactly what we are seeing. Has anybody else had a
          similar problem? We've seen it three times at this point. It only seems to
          happen after stress or extended usage of the WebLogic server (several days).
          After null is returned, it is always returned until you restart the server.
          We are running WebLogic 4.5.1 (service pack 2) with clustering and in-memory
          replication of session data. We use jview (Microsoft's VM) on Windows NT
          Server 4.0 (service pack 6).
          Thanks,
          Walter Bodwell
          Evity, Inc.

Copied from the API:
          getSession
          public HttpSession getSession(boolean create)
          Returns the current HttpSession associated with this request or, if
          necessary, creates a new session for the request. Use true for create to
          create a new session, or false to return the current HttpSession.
          If create is false and the request has no valid HttpSession, this method
          returns null.
          To make sure the session is properly maintained, you must call this method
          at least once before you write any output to the response. Newly created
          sessions (that is, sessions for which HttpSession.isNew returns true) do not
          have any application-specific state.
          Parameters:
          true - to create a new session for this request; false to return the current
          session
          Returns:
          the HttpSession associated with this request or null if create is false and
          the request has no valid session
          getSession
          public HttpSession getSession()
          Returns the current session associated with this request, or if the request
          does not have a session, creates one.
          Returns:
          the HttpSession associated with this request
          Hope that helps,
          -Andrew
          Walter Bodwell <[email protected]> wrote in message
          news:[email protected]...
          > The spec itself is not very clearly written, but seems to imply that
          > getSession( true ) only creates a session if there is not one already
          > associated with the request:
          >
          > getSession
          >
          > Returns the current valid session associated with this request. If this
          > method is called with no arguments, a session will be created for the
          > request if there is not already a session associated with the request. If
          > this method is called with a boolean argument, then the session will be
          > created only if the argument is true.
          >
          > The API documentation is much more clear (the important words being if
          > necessary):
          >
          > public abstract HttpSession getSession(boolean create)
          >
          > Gets the current valid session associated with this request, if create is
          > false or, if necessary, creates a new session for the request, if create
          is
          > true.
          >
          > Walter
          >
          > Andrew Robinson <[email protected]> wrote in message
          > news:[email protected]...
          > > In 2.1 getSession(true) ALWAYS creates a new session, getSession(false)
          > > returns the current session (or null).
          > > With getSession(), it returns the existing session, or creates a new one
          > if
          > > there is not one. Check out the API, very important difference.
          > >
          > > -Andrew
          > >
          > >
          > > Walter Bodwell <[email protected]> wrote in message
          > > news:[email protected]...
          > > > Doesn't getSession() just call getSession( true )? The descriptions
          for
          > > the
          > > > two sound identical.
          > > >
          > > > Thanks,
          > > > Walter
          > > >
          > > > Andrew Robinson <[email protected]> wrote in message
          > > > news:[email protected]...
          > > > > Try using getSession(), no arguments, it is in the 2.1 servlet spec
          > > > >
          > > > > Walter Bodwell <[email protected]> wrote in message
          > > > > news:[email protected]...
          > > > > > It is my understanding that when you call getSession on an
          instance
          > of
          > > > > > HttpServletRequest with a parameter of true, it should return the
          > > > existing
          > > > > > session (if there is one) or a new session. It should never
          return
          > > > null.
          > > > > > Unfortunately, that is exactly what we are seeing. Has anybody
          else
          > > had
          > > > a
          > > > > > similar problem? We've seen it three times at this point. It
          only
          > > > seems
          > > > > to
          > > > > > happen after stress or extended usage of the WebLogic server
          > (several
          > > > > days).
          > > > > > After null is returned, it is always returned until you restart
          the
          > > > > server.
          > > > > >
          > > > > > We are running WebLogic 4.5.1 (service pack 2) with clustering and
          > > > > in-memory
          > > > > > replication of session data. We use jview (Microsoft's VM) on
          > Windows
          > > > NT
          > > > > > Server 4.0 (service pack 6).
          > > > > >
          > > > > > Thanks,
          > > > > > Walter Bodwell
          > > > > > Evity, Inc.
          > > > > >
          > > > > >
          > > > >
          > > > >
          > > >
          > > >
          > >
          > >
          >
          >

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How do I handle NULL returns from prepared statement?

Thanks in advance to all those who respond. As a beginner with Java/JSP/JDBC, I need all the help I can get!
Here's the problem...
I'm using a prepared statement in JSP to query a MySQL database.
If there is a value to return, everything works properly.
If the query returns a NULL (empty set) value, I get the following error:
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<%
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Thanks for the help!!!

I think I have a better handle on what's occurring here. To cut to the heart of the problem, I'm going to give a very simple example that illustrates what type of error handling I need.
HERE'S THE EXAMPLE:
Let's say that I have a database of users. There are only two columns in the database: user_id and lastname. There are only 2 users, user_id "1" has lastname "Jones" and user_id "2" has lastname "Smith".
I built a very simple web interface that let's a user enter a number to see if there's a lastname associated with that record. The user has no way of knowing if the user_id exists or not, so they may or may not enter a valid number.
If the user enters a valid user_id (in this case "1" or "2"), then the correct lastname is displayed. If the user enters an invalid user_id (in this case, anything other than "1" or "2") then I get the same "Before start of result set" error that I'm getting in my real application.
So, the question is: WHERE IN THIS CODE WOULD I HANDLE THE RETURN OF AN EMPTY SET?
The goal here is to have the sentence say "The user's lastname is .", basically returning null. If there has to be a value, then have the last sentence say "The user's lastname is unknown."
If you can solve this simple example, you'll have also solved the problem with my main application!!!! :-)
Here's the example code:
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<%@ include file="Connections/example.jsp" %>
<%
String Recordset1__MMColParam = "1";
if (request.getParameter("user_id") !=null) {Recordset1__MMColParam = (String)request.getParameter("user_id");}
%>
<%
Driver DriverRecordset1 = (Driver)Class.forName(MM_example_DRIVER).newInstance();
Connection ConnRecordset1 = DriverManager.getConnection(MM_example_STRING,MM_example_USERNAME,MM_example_PASSWORD);
PreparedStatement StatementRecordset1 = ConnRecordset1.prepareStatement("SELECT * FROM test_table WHERE user_id = " + Recordset1__MMColParam + "");
ResultSet Recordset1 = StatementRecordset1.executeQuery();
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Object Recordset1_data;
int Recordset1_numRows = 0;
%>
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
<form action="test.jsp" method="get" enctype="application/x-www-form-urlencoded" name="form1" target="_self">
<p> Submit a user id and a lastname will be displayed.</p>
<p>
<input type="text" name="user_id">
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</p>
</form>
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</body>
</html>
<%
Recordset1.close();
StatementRecordset1.close();
ConnRecordset1.close();
%>
A huge "THANK YOU!!!!" to all those who've helped me here!!!

Geting null values from request

hi!
i m producing this code through out.println() method in my page and then using java script
i am submiting this page to another page
<td width="56%"><textarea name="question_no_1"></textarea></td>
<input name="question_no_1_radio1" type="radio" value="radio"></td>
<td width="59%"> <textarea name="question_no_1_ans1"></textarea></td>
<input type="radio" name="question_no_1_radio2" value="radio"></td>
<td><textarea name="question_no_1_ans2"></textarea></td>
<input type="radio" name="question_no_1_radio3" value="radio"></td>
<td><textarea name="question_no_1_ans3"></textarea></td>
<input name="question_no_1_radio4" type="radio" value="radio"></td>
<td><textarea name="question_no_1_ans4"></textarea></td>
but when i submit it to the other page and try to retrieve value of parameter "question_no_1"
through the bellow statement it shows a null value but i have given a value previously by
typing a question in it
System.out.println("the Body Of The First Question Is "+request.getParameter("question_no_1"));
can anybody help me what is going on here.
also if i try to normaly submit first page (ie <form="form1" method="post" action="other_jsp_page.jsp"> ) then the statement in the next page gives me the correct value but
i have to submit the first paper through java script.
if u want to see full detail of my code then go to the following link
http://forum.java.sun.com/thread.jsp?thread=309254&forum=45&message=1237097
thanx in advance

OK, your problem is that you are not submmiting the values to the other page. When you do the
--> document.forms[0].submit();
in JavaScript, the form has to action defined
--> <form name="form1" method="" action="">
So, the page does nothing. The line following the submit just changes the location of the page, IT DOES NOT POST the values.
One solutions is the following:
1.- define an action for your form:
<form name="form1" method="POST" action="'save_paper.jsp">
2.- Then create a JavaScript function that validates the fields and simply return "true" if the form is correct, and false if there is a problem (just a little modification of the one you have).
3.- Then modify your submit button:
Instead of:
<input type="button" name="Save" value="Save" onClick="validateField()">
Try:
<input type="SUBMIT" value="Save" onclick="validateField();">

Reading Null Values From Request Object

For a proof-of-concept, I wrote a mini program that has 2 files. File #1 is main.html. There's a javascript function called addNewRowToThisTable that isn't displayed but it basically allows the user to create as many rows in the table as user desires. When the "Submit" button is clicked the file ReadIt.jsp is called and it's supposed to display on the first and last names of the people who had the checkbox for that row checked. The best way to illustrate the problem I'm having is through an example. Let's say there are 3 rows:
[x] Alan Anderson [Add New Row]
[ ] Bob Brady [Add New Row]
[x] Carl Chadwick [Add New Row]
[Submit]
Let's assume that only rows 1 and 3 are clicked. After the form is submitted the JSP will print...
firstNameArr .length = 3
lastNameArr .length = 3
isSelectedArr.length = 2
firstNameArr[0] = Alan
lastNameArr[0] = Anderson
firstNameArr[1] = Bob
lastNameArr[1] = Brady
Unfortunately firstNameArr[1] and lastNameArr[1] should be "Carl", and "Chadwick" respectively. I know the reason why it's failing is because my program relies on the array index of the "isSelected" field to perfectly match up with the "firstName" and "lastName" fields. It's unreliable because if the checkbox for a row is not checked then it won't show up in the JSP String array isSelectedArr. I'm not really sure how to get around this problem. I have 2 ideas at the beginning of solutions but I'm not sure how to follow through on either and I'm also not sure if either is the proper approach to take. My guesses are...
1) There's some way in JSP to use "getParameterValues('isSelected')" to retrieve the full array of "isSelected" items regardless of whether or not they're checked. That would guarantee that my arrays would match up correctly. Unfortunately, I haven't been able to find this.
2) Maybe I can put in some sort of ID in the "isSelected" field that would relate the checkbox to the rest of the data in the row. The problem with this is that I've got a dynamic # of rows due to my addNewRowToThisTable method.
So the bottom line is that I'm thoroughly stumped. If anyone can offer advice I'd be very grateful.
main.html
<html><head><title></title></head><body>
<form method="get" action="ReadIt.jsp">
<table>
<tr>
     <td><input type="checkbox" name="isSelected" /></td>
     <td><input type="text" name="firstName" /> </td>
     <td><input type="text" name="lastName" /></td>
     <td><input type="button" value="Add New Row" onClick="addNewRowToThisTable(this)" />
</tr>
<tr>
     <td colspan=4><input type="submit" value="submit"></input></td>
</tr>
</table>
</form>
</body></html>
ReadIt.jsp
<%
String[] isSelectedArr = request.getParameterValues("isSelected");
String[] firstNameArr = request.getParameterValues("firstName");
String[] lastNameArr = request.getParameterValues("lastName");
if (firstNameArr != null) System.out.println("firstNameArr .length = " + firstNameArr .length);
if (lastNameArr != null) System.out.println("lastNameArr .length = " + lastNameArr .length);
if (isSelectedArr != null) {
     System.out.println("isSelectedArr.length = " + isSelectedArr.length);
     for (int i=0; i < isSelectedArr.length; i++) {
          System.out.println("firstNameArr["+i+"] = " + firstNameArr);
          System.out.println("lastNameArr["+i+"] = " + firstNameArr[i]);
%>

it's sort of a kludge, but try this:
your javascript function adds new for fields that get submitted to the servlet. name the checkboxes uniquely with a patterm with said function, say isSelected-1, isSelected-2, isSelected-3... now also name the first and last name fields the same way. fname-1, fname-2, fname-3... lname-1,lname-2,lname-3.
when you get to the page that is supposed to match them up, go through all the request parameters looking for those that start with "isSelected-" take the last char (the index), convert it to an int, and then from your request do:
String first = request.getParameter("fname-" + indexThatWasFound);
          String last = request.getParameter("lname-" + indexThatWasFound);in looping over the request for each index recovered from the searching of the request for the isSelected-n values, you will get the matching first and last name.
I TOLD you it was a kludge.

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Hi All,
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<?xml version="1.0" encoding="UTF-8"?>
<ns0:MT_Matmvmt_Jdbc_Request_response xmlns:ns0="http://esag.com/xi/bat/MatMovementRead">
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My requirement is that if there are no records matching the select condition then my response message should look like below.
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Regards,
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Hi Sandeep,
you can not expect structure like <?xml version="1.0" encoding="UTF-8"?>
<ns0:MT_Matmvmt_Jdbc_Request_response xmlns:ns0="http://esag.com/xi/bat/MatMovementRead">
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         <MATERIAL/>
         <UOM/>
         <SOLDQTY/>
         <SAPUPD/>
      </row>
   </StatementSelect_response>
</ns0:MT_Matmvmt_Jdbc_Request_response>
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thanks,
madhu

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Hi,
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          Prasad
          vlad wrote:
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          > Any ideas why this might be happening?
          >
          > Thanks a lot.
          >
          > Vlad.

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I am new to servlets. I couldn't find any difference between request.getSession()
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Thanks.

I am new to servlets. I couldn't find any difference
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any one help me plese.
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Hi Guys !
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Hi SP,
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http://stackoverflow.com/questions/10911610/ssrs-webpage-error-status-code-500
http://srinivasbn.blogspot.in/2013/09/syswebformspagerequestmanagerservererro.html
http://connect.microsoft.com/SQLServer/feedback/details/782155/ssrs-2012-failed-with-win32-error-0x03e3
If you have more questions about the SSRS error logs related to this issue, you can post in the SSRS forum for a better assistance with more experts.
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/home?forum=sqlreportingservices
Thanks
We are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Sys.WebForms.PageRequestManagerServerErrorException : An unknown error occured while processing the request on the server.The status code returned from server is 12019 in report viewer

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SP

Hi SP,
Please check if the following web config appSettins value settings from SSRS server could fix the issue (Note, back up your original web config file before any modification).
http://stackoverflow.com/questions/10911610/ssrs-webpage-error-status-code-500
http://srinivasbn.blogspot.in/2013/09/syswebformspagerequestmanagerservererro.html
http://connect.microsoft.com/SQLServer/feedback/details/782155/ssrs-2012-failed-with-win32-error-0x03e3
If you have more questions about the SSRS error logs related to this issue, you can post in the SSRS forum for a better assistance with more experts.
http://social.msdn.microsoft.com/Forums/sqlserver/en-US/home?forum=sqlreportingservices
Thanks
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How to trap null return values from getters when using Method.invoke()?

Hi,
I am using Method.invoke() to access getters in an Object. I need to know which getters return a value and which return null. However, irrespective of the actual return value, I am always getting non-null return value when using Method.invoke().
Unfortunately, the API documentation of Method.invoke() does not specify how it treats null return values.
Can someone help?
Thanks

What do you get as a result?I think I know what the problem is.
I tested this using following and it worked fine:
public class TestMethodInvoke {
public String getName() {
return null;
public static void main(String args[]) throws SecurityException, NoSuchMethodException, IllegalArgumentException, IllegalAccessException, InvocationTargetException {
Object o = new TestMethodInvoke();
Class cls = o.getClass();
Method m = cls.getMethod("getName", (Class[]) null);
Object result = m.invoke(o, (Object[])null);
if (result == null) {
System.err.println("OK: Return value was null as expected");
else {
System.err.println("FAILED: Return value was NOT null as expected");
However, when I use the same technique with an EJB 3.0 Entity class, the null return value is not returned. Instead, I get a String() object. Clearly, the problem is the the EJB 3.0 implementation (Glassfish/Toplink) which is manipulating the getters.
Regards
Dibyendu

Null returned from request.getSession( true )

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