Second request
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Similar Messages
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DoFilter() method is being called only at the second request
Hi,
I have implemented a simple Filter class
Here is the code
public class BasicFilter implements Filter
FilterConfig config;
public void init(FilterConfig config)
System.out.println("Filter Initialised");
this.config = config;
public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws ServletException,
IOException
System.out.println("In The doFilter() method");
ServletContext sc = config.getServletContext();
sc.setAttribute("Hello","Hell");
chain.doFilter(request,response);
public void destroy()
System.out.println("In the destroy method");
and a simple servlet
public class FilteredServlet extends HttpServlet
public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<HTML>");
out.println("<HEAD><TITLE>Filter Demo</TITLE></HEAD>");
out.println("<BODY>");
out.println(getServletContext().getAttribute("Hello"));
out.println("</BODY>");
out.println("</HTML>");
Now when i start the server (Tomcat 4.0) i find that the filter's init() method is being called which is fine. But when i request the servlet (FilteredServlet) the doFilter() method is not called and only when i "refresh" it or call it a second time that the doFilter() method is actually called. What could be the reason for this.
Help will be greatly appreciated.
Thank You,
Phani KanuriHi jleech,
Thanks for the reply. But deleting all the temporary internet files as also the history files does not seem to have an effect. the doFilter is being called only at the second request. or did i miss anything??
Please help. unable to complete the assignment because of this.
Thank You,
Phani Kanuri -
When a second request is made to the JSP page, is the request sent to the servlet directly or is it handled by the JSP page. The question comes bcos when the JSP page is requested for a second time, a copy of the .class file is already available in the servlet container.
hello,
Even the first "request" is handled by the generated servlet! On to point, The JSP page GETS COMPILED ONLY ONCE after you install/modify it ,or on restart of server.Once a request is send to the jsp page ,the server checks for the time flag of the JSP file,and if it finds that the jsp page is modified,it recompiles the page,and send the request to the generated servlet for processing.Else it handles over the request to new servlet instance of precompiled servlet class.Note the diff in latency when you first call the JSP page and subsequent calls.This is because of foresaid reason.
Just 4 fun try deleting the .class files in works folder,if u work on a tomcat.
cheers
[email protected] -
Getting general error on second request
Hi sir
I have developed one review page using jsp and servlet. On first request it displays the data in jsp page. but when i submit the form second time, it gives the general error.
Plz tell me why it happens, am i missing something, then tell what?
Regards
Inamhi sir,
The code i have written in jsp cum servlet as follows:-
review.jsp
<%@ page language="java" import="java.util.*" %>
<form action="review" method="get">
<input name="name" type="text" size="40" />
<input name="email" type="text" size="40" />
<textarea name="query" cols="32" rows="5" ></textarea>
<input name="submit" type="submit" value="Submit " />
</form>
<%
try
ArrayList arr= (ArrayList)request.getAttribute("review");
Iterator<String> it=arr.iterator();
while(it.hasNext())
String cust_name=(String)it.next();
String cust_query=(String)it.next();
%>
Name:
<%
out.println(cust_name);
%>
Query:
<%
out.println(cust_query);
%>
<%
catch(Exception e)
e.printStackTrace();
%>
ReviewServlet.java
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
import java.io.*;
import java.util.*;
public class ReviewServlet extends HttpServlet
Connection con=null;
PreparedStatement pst=null;
ResultSet rs=null;
public void init(ServletConfig sc)throws ServletException
try
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
con=DriverManager.getConnection("jdbc:odbc:rdsn");
catch(Exception e)
e.printStackTrace();
}//init
public void doGet(HttpServletRequest req, HttpServletResponse res)throws ServletException,IOException
PrintWriter pw=res.getWriter();
String name1=req.getParameter("name");
String query=req.getParameter("query");
try
ArrayList<String> arr=new ArrayList<String>();
pst=con.prepareStatement("insert into Review values (?,?)");
pst.setString(1,name1);
pst.setString(2,query);
int ins=pst.executeUpdate();
pst=con.prepareStatement("select * from Review");
rs=pst.executeQuery();
while(rs.next())
arr.add(rs.getString(1));
arr.add(rs.getString(2));
req.setAttribute("review",arr);
RequestDispatcher rd=req.getRequestDispatcher("/review.jsp");
rd.forward(req,res);
rs.close();
pst.close();
con.close();
catch(Exception e)
pw.println(e.getMessage());
e.printStackTrace();
pw.close();
}//doGet()
}//ReviewServlet
When i submit the form and clisk first time, it displays all rows. but successively when i submit the form second time it doesnot work.
Regards
Inam -
Avoid second request for list in dataTable
Hi, I'm using a dataTable to display a productlist. The name of each product can be clicked to show product details, e.g.
<h:dataTable value="#{productList.list}" var="var">
<h:column>
<f:facet name="header">
<h:outputText value="Product" />
</f:facet>
<h:commandLink action="#{productList.showProduct}" immediate="true" >
<h:outputText value="#{var.name}" />
<f:param name="id" value="#{var.id}" />
</h:commandLink>
</h:column>
</h:dataTable>
When the page is loaded for the first time productList.getList() is called. But when a user clicks on a commandlink productList.getList() is called again, even before productList.showProduct() !
This means that, since the action is immediate, either the Restore View or the Apply Request Values phase somehow needs productList.list (but I don't see why...).
Since productList.getList() can be rather time consuming I would like to avoid this second call. Does anybody know how ?
ps. And I DON'T want to use a session scope bean to keep a copy of the product list !I have a very similar piece of functionality in my application. I have a dynamic list of issues to display based on results that are retrieved from a database - so the number of items in my array is dynamic. I am able to write out the links in the datatable, but when I click on them nothing happens.
Here's my jsp:
<h:dataTable id="issuesList" value="#{topicList.issueList}" var="issue" >
<h:column>
<h:commandLink id="issue" value="#{issue.issueDesc}" actionListener="#{billList.findBillsByIssue}" action="#{billList.displayBills}">
<f:param value="#{issue.ID}" id="issueID" name="issueID"/>
</h:commandLink>
</h:column>
</h:dataTable>
My topicList.getIssueList() is never being called after I submit the request. I don't think that my array is initialized correctly. Can you tell me how you are initializing your product list? Is it dynamic?
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How to handle second request for addition to same AD group at code level?
I am using custom java code for adding group memberships to users based on multiple multi-valued attributes.
Example: Location Code is a comma separated multi-valued field in OIM User Form and I need to kick off my code each time the attribute is updated.
If only 1 value in the LocationCode changes, I want to only add users to the group for this value not the older values that have not changed.
How do I handle this scenario where the code adds the user to the same group twice in OIM. In AD the user is only added once. Do I need to write additional code to read all existing groups of the user, compare them with the new requests and then add new groups?Not a big deal.
Create a trigger in Xellerate users process defn. There u'l get option for old and new value. take both values and compare both values using stringtokenizer and update the child form or group membership. -
JTable (yes, again) with TableSorter - exception in the second request.
While using the TableSorter the data is populated correctly and I manage to sort the items (beautiful)
say I ask for a list of items and the return result is 20 and the second time I'll ask for a list of items where the return result is greater than 20 items an error will occur with reference to: java.lang.ArrayIndexOutOfBoundsException : 10
com.softme.jtable.Renderer.TableSorter.modelIndex(TableSorter.java:207)
com.softme.jtable.Renderer.TableSorter.getValueAt(TableSorter.java:249)
public int modelIndex(int viewIndex)
return getViewToModel()[viewIndex].modelIndex;
}any idea why this happens?I am also getting this same Exception... I have tried various things to prevent this from happening. I can state that in my case I am running table model updates in a SwingWorker Thread to create a visual effect on the screen (rows are being processed and updated as the user watches)
Could this be a problem of the JTable object accessing the getValue method to update the screen at the same time as the Thread is accessing it for the test value locking the model index object?
Just a thought.
This problem is very annoying to the user as it only happens once-in-a-while. Thanks for any help on this problem.
Here is the changes I made to the code and the error I get... As you can see I test for NULL before running the line, it passes and then STILL gives a NullPointerExcpetion... this is why I am thinking Thread issue...
public int modelIndex(int viewIndex) {
Row[] row = getViewToModel();
if (row == null) System.out.println("?: " +viewIndex);
if (row != null) {
return row[viewIndex].getModelIndex(); //this line is throwing the NPE
else
return -1;
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at com.adriansteel.rpg.rpgSubfileSorter.modelIndex(rpgSubfileSorter.java:323)
at com.adriansteel.rpg.rpgSubfileSorter.getValueAt(rpgSubfileSorter.java:363)
at javax.swing.JTable.getValueAt(Unknown Source)
at javax.swing.JTable.prepareRenderer(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintCell(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paintCells(Unknown Source)
at javax.swing.plaf.basic.BasicTableUI.paint(Unknown Source)
at javax.swing.plaf.ComponentUI.update(Unknown Source)
at javax.swing.JComponent.paintComponent(Unknown Source)
at javax.swing.JComponent.paint(Unknown Source)
at javax.swing.JComponent.paintWithOffscreenBuffer(Unknown Source)
at javax.swing.JComponent.paintDoubleBuffered(Unknown Source)
at javax.swing.JComponent._paintImmediately(Unknown Source)
at javax.swing.JComponent.paintImmediately(Unknown Source)
at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source) -
Hi
Am posting this again as i did not get any replies.. any help will be highly appreciated..
i have an issue with AR. The customer has made a payament of $20000. The total payment that was due has been made. If we want the payment to be spread over the next 10 months as against immediate clearing, how do we go about it?
In short, how do we post the receipt of payment over a particular period after it being received in full.thanks a lot for the reply. Even i thought about the same option. But there is no partial payment happening. The payment has been received in full but for the internal purpose the company wants it to be accounted over 10 months.
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Second request; How canyou remove a power line with PS CC?
Hi,
I konw there is a terrific new feature in PS CC (I have used it before!) but I just can't find any explanation on how to to do it!
The question is how do you remove, from an imge, a power line, or a telephone line by symply clicking on both ends of those lines in order to remove them?
Thanks
SergeHi,
Thanks to you and others on this.
They all finally brought me to the solution even by haphazard ways.
It turns out the the feasture was able under PS CS5 (which I didn't have).
However the feature under cc is slightly different and here it is FWIW.
1) Use the Spot healing brush tool
2) Make sure the content awareness is checked.
3) I checked also "sample all layers"
4) clik on one end
5) clic on the other end with shift-click
and the nasty little wire is gone.
I don't understand why such a neat feature like this is still not much advertised.
Regarss
Serge -
Since I loaded v 5: 1) The system hangs if I open multiple internet tabs. 2) The system intermittently hangs when I try to write a message. 3) It takes forever to close when it hangs - sometimes requiring a hard shut down. 4) Often, when I close Mozilla and attempt to reopen, it tells me it is already open. If I open the task window, there is nothing there but sometimes that does the trick and I can reopen - sometimes not. 5) Sometimes when I open Firefox, it automatically opens the last tabs. 6) My entire system has slowed. I am operating on XP. I use Norton 360 as a firewall and anti-virus so I think I am clean. HELP
Since I loaded v 5: 1) The system hangs if I open multiple internet tabs. 2) The system intermittently hangs when I try to write a message. 3) It takes forever to close when it hangs - sometimes requiring a hard shut down. 4) Often, when I close Mozilla and attempt to reopen, it tells me it is already open. If I open the task window, there is nothing there but sometimes that does the trick and I can reopen - sometimes not. 5) Sometimes when I open Firefox, it automatically opens the last tabs. 6) My entire system has slowed. I am operating on XP. I use Norton 360 as a firewall and anti-virus so I think I am clean. HELP
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Second Request On C4780 Wireless Printing
Hi. Doesn't anyone have a probable solution to this issue? Thanks.
I have a C4780 that I've installed and uninstalled the software twice for already. The computer is a Dell laptop. The printer was previously printing wirelessly with a Mac, no problems. Now at the completion of the software installation, the printer congratulates me for a clean setup and prints a nice color test page. When I look in Printers And Devices, the printer is there with a green check mark all ready to go as the default printer.
I have ATT Uverse service, broadband internet, TV, phone, 2-wire162 broadband wireless router, windows 7 home premium...WPA_PSK authentication, TKIP encryption, and the encryption key. I have a Brother MFC-6890CDW all-in-one that works perfectly as a stand-alone wireless device. Norton Anti-Virus is my anti-virus software.
Problem: As soon as I hit print for any document, I get a "Printer Error" and I can't print anything. Can someone help me with this?
JoeDocDid you download and run this utility?
Say thanks by clicking "Kudos" "thumbs up" in the post that helped you.
I am employed by HP -
Help with getting values from request. Very Strange!!
Hello,
My very strange problem is the following.
I have created three dynamic list boxes. When the user select
the first list box, the second becomes populated with stuff
from a database. The third becomes populated when the second
is selected. Now, I have used hidden values in order for
me to get the selected value from the first listbox. The
following code is my first listbox:
<SELECT NAME="resources" onChange="document.hiddenform.hiddenObject.value = this.option [this.selectedIndex].value; document.hiddenform.submit();">
<OPTION VALUE =""> Resource</OPTION>
<OPTION VALUE ="soil"> Soil </OPTION>
<OPTION VALUE ="water"> Water </OPTION>
<OPTION VALUE ="air"> Air </OPTION>
<OPTION VALUE ="plants"> Plants </OPTION>
<OPTION VALUE ="animals"> Animals </OPTION>
</SELECT>
I use the getRequest method to get the value of hiddenObject.
At this time I am able to get the value of hiddenObject to populate
the second list box.
But, when the user selects an item from the second list box
and the second form is also submitted,
I lose the value of hiddenObject. Why is this??
The code to populate my second listbox is the following:
<SELECT NAME ="res_categories" onChange="document.hiddenform2.hiddenObject2.value = this.options[this.selectedIndex].value; document.hiddenform2.submit(); ">
<OPTION VALUE ="" SELECTED> Category</OPTION>
Here I access a result set to populate the list box.
Please help!!Form parameters are request-scoped, hence the request.getParameter("hiddenObject"); call after the submission of the second form returns a null value because the hiddenObject parameter does not exist within the second request.
A solution would be to add a hiddenObject field to your second form and alter the onChange event for res_categories to read
document.hiddenform2.hiddenObject.value=document.1stvisibleformname.resources.option[document.1stvisibleformname.resources.selectedIndex].value;
document.hiddenform2.hiddenObject2.value = this.options[this.selectedIndex].value;
document.hiddenform2.submit();You will then come across a similar problem with your third drop-down if indeed you need to resubmit the form...
A far better approach would be to create a session scoped bean, and a servlet to handle these requests. Then when the servlet is called, it would set the value of the bean property, thus making it available for this request, and all subsequent requests within the current session. This approach would eliminate the need for the clunky javascript, making your application far more stable. -
Want to get request number to BPEL process in an interval
Hi All,
I have two applications A and B.I need to receive request message from A to B through BPEL process. BPEL process receives the request data(through schema- Source of transform activity) from A and updates that data into B(Target -request schema of B).BPEL process is the middleware between two applications
My requirement is :
I want to analize request data in an interval of 24 hours. I have one parameter('sequence') in the request schema of B which has to indicate the request number to BPEL process.
Clear explanation to requirement details:
Application A starts pushing data at 12 'o clock(0:00 hrs midnight) and then parameter 'sequence' should be integer 1 or 0.Like that 'Sequence' should be increased by 1 for every request to BPEL process.
I want the sequence values like below(for 24 hrs cycle):
First request :
Reuqest push time - 0:00 hrs
Sequence - 1
BPEL process instance(which will be created automaically in EM console) - Instance1
Second Request :
Reuqest push time - 1:30 hrs
Sequence - 2
BPEL process instance(which will be created automaically in EM console) - Instance2
1
Third Request:
Reuqest push time - 4:00 hrs
Sequence - 3
BPEL process instance(which will be created automaically in EM console) - Instance3
Like that
last request in 24 hrs cycle should be :
Reuqest push time - 23:00 hrs
Sequence - Some number according to number of requests at that time.
After 24 hrs ,Sequence again should become as 1 to indicate the starting point of the 24 hrs next day.(like data in above table)
Can you help me in this regard? I am using transform activity in which I have 'sequence' parameter .
Thanks in advance
Edited by: 899283 on Aug 25, 2012 7:16 AMCreate a "While" activity.
Create a variable named seq of type int.
In the while condition check the current time.
xp20:current-time() < <counter reset time>
Create a pick activity to receive the message inside while loop.
Create assign activity in the while loop. Assign the value of variable seq to the payload and increment it by one.
Outside while loop , reset seq back to 0 by using another assign activity.
In case the composite has to run continuously after first submission, use another outer while loop to check the condition while seq = 0.
Hope it helps.
Regards. -
How to get useful data from request?
Hello.
I am looking for creating a management tool for a web site. All I want is that is there any ready to use API or package or open source project for retrieving user�s information? I just mean that is there any easy to use way in java to get useful data from a client (for example location, his or her system configuration and information �).
Thanks.If you dump all the data from request (see the javadoc, and especially the "header methods" ) you'll see the data you can get are quite simple.
The only thing you can try to rely on are ;
- the IP address from the sender (when reversed to DNS, you can sometime use the tld to locate the country it comes from. Yet, you'll get many .com name, so it's not that significant. it may also give you the IAP used). Note that if the user is using a proxy, it's the proxy IP that you'll collect
- the User-Agent header : from this, you can guess the OS and the browser used
- the Referer header : usefull to get where your user comes from (where they found a link to your site)
- the Cookie header : if you're using a servlet container with session id stored in cookie, you should see the Cookie header appear on the second request to your site. That helps finding out wether your user accep cookie or not (from a server point).
Besides these, i don't think you can get any other useful data without asking your users on a form. Note that it's the client that decides to send Referer, User-Agent or Cookie headers. Those are not mandatory to the Http Protocole and some browser allow their user to fool their content (butmore than 90% of the widespread browsers don't) -
Calling a method after 10 seconds
Hello,
I need to call a method after 10 seconds. That is to make sure that if one particular field is updated, say 3 times in a window of 10 seconds, I should just be able to take the last value and process it, in my ajax app. I am so far using the Timer class, but the problem is, it ticks off a thread for every single request to be processed after 10 seconds and processes all the 3 requests, where as I should just be running that method once for the last request. Could you please help me with this ?
Cant do this at the client level, for the page may be closed within those 10 seconds of the event and the setTimeout wont work then.
This is what I made so far.:
final Map<String, Object> mp = new HashMap<String, Object>();
if(form.getEmpId() != null )
mp.put(form.getEmpId().toString(), form);
new java.util.Timer().schedule(new java.util.TimerTask()
public void run()
EmpForm form1 = (EmpForm)mp.get(empId.toString());
String empId = form1.getempId().toString();
String value1Changed = form1.getValue1Changed().toString();
String value2Changed = form1.getValue2Changed().toString();
myService.changeData(empId, value1Changed, value2Changed),
}, 10000);
}Thanks for replying
tjacobs01 wrote:
My recommendation is that you share an AtomicReference between your timer and the listener that is receiving the updates. This way, the listener can just update the value, and the timer uses the latest one when it wakes upOk, out of my limited understanding, I looked up AtmoicReference and found it a class. I think I cant use that since I am maintaining a list of empIds against the object that holds their data in a hashmap, expecting the map to override the empId on the second request. So, I made a final map and thought Id just push the timer scheduler method in another method, but the problem is, for me to ask that thread (which I expect to run after 10 seconds of my calling) to run, I need to call it somewhere, and as soon as I get a request I am calling the method which runs/ticks off the thread.
I was thinking that since I am passing and using a final map (that I declared as a class level variable), I will be able to put update the map object and whenever the thread runs, will fetch the latest value (of the empId) in the map. But I guess I am doing it wrong. :(
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