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input value text field in jsp error

My index.jsp is as following:
<form action="FileUploadServlet" id="formSubmit" method="post" enctype="multipart/form-data">
<input type="text" id="txtFileName" value="${fname}"/>
<input type="file" name="fileName" id="selectedFile" style="display: none;">
<input type="button" id="btnBrowse" value="Browse..." onclick="document.getElementById('selectedFile').click();" />
<input type="submit" value="Upload" id="btnUpload">
</form>
with value=${fname} is get from dopost method in servlet when form summited
request.setAttribute("fname", fileName);
getServletContext().getRequestDispatcher("/index.jsp").forward(
request, response);
But it's weird that when I deployed index.jsp
My text field always show ${fname} in text area, even after form submitted, its still get that value (correctly it must show 'filename')
Does anyone meet this problem like me?

First thing is that, you are using wrong syntax to display value in JSP.
Below syntax is wrong.
value="${fname}"
We use expression tag fordisplaying value in JSP page. Expression tag convert into Java statement.
<%=request.getAttribute("fname")%>
When you first time open your index.jsp page, it will show you blank value and when request will come back from server side, then it will show you correct result.
Use below code.
<%if(request.getAttribute("fname")!=null){%>
<input type="text" value ="<%=request.getAttribute("fname") %>"/>
<%}else
{ %>
<input type="text"/>
<%} %>

In JSP, the correct syntax to retrieve the values is
<%=request.getAttribute("fname")%>
This is known as assignment OR expression tag (<%=%>).
Try this ...
<form action="FileUploadServlet" id="formSubmit" method="post" enctype="multipart/form-data">
<input type="text" id="txtFileName" value="<%=request.getAttribute("fname")%>"/>
<input type="file" name="fileName" id="selectedFile" style="display: none;">
<input type="button" id="btnBrowse" value="Browse..." onclick="document.getElementById('selectedFile').click();" />
<input type="submit" value="Upload" id="btnUpload">
</form>
More related to this, here.

How to access the html form data in java program

i have created a java project in eclipse,in this project i have an html form customer.html as shown below
<form>
Name :<input type="text" id="name"/>
Address: <input type="text" id="add"/>
Age:<input type="int" id="age"/>
<input type="submit" onclick="what should i call here in my program"/>
</form>
once the user fills the form and submits it i want to access the form field in java code is it possible.if so how or else is there anyother solution to create an xml file for this form

<input type="submit" onclick="only Javascript function can be called here"/>
if you want to access html form elements at java code you need to submit your form at some controller or another jsp. Like..
<form name="new_employee" method="post" action="../admin/newEmployee.do">
Name :<input type="text" name="employeeName"/>
Address: <input type="text" name="add"/>
Age:<input type="text" name="age"/>
<input type="submit" value="Submit"/>
</form>
form elements can be accessed from generated request by their names like..
request.getParameter("employeeName");

navigating through tab key not working properly

in my jsp, when i navigate through tab key it skips my Save and Reset button. and move to next component in my page. even though i have not used tabindex in my jsp files. please suggest what could be the reason. thanks
code is like:
<div>
<input type="hidden" name="_flowExecutionKey" value="${flowExecutionKey}"/>
<input type="submit" class="button" name="_eventId_search" value="Search"/>
<span class="save_button_common" onClick="submitForm('save')">Save</span>
<span class="reset_button_common" onClick="submitForm('reset')">Reset</span>
</div>

May be because it is not input type , you can explicitly try setting tabIndex

Try:
<div>
<input type="hidden" name="_flowExecutionKey" value="${flowExecutionKey}"/>
<input type="submit" class="button" name="_eventId_search" value="Search"/>
<input type="button" class="save_button_common" onClick="submitForm('save')">Save</input>
<input type="button" class="reset_button_common" onClick="submitForm('reset')">Reset></input>
</div>
Note if it's a form you need input type="button" rather than just using <button> which you can otherwise just for straight links that don't submit a form. This is particularly relevant with Internet Explorer that treats the button tag somewhat differently to other browsers (submitting the "value=" rather than the enclosed text or something like that)

PayPal sandbox Buy Now Problem

I have paypal sandbox test account. I want to create a 'buy Now' button. I am trying it with GWT.
But its even not working with simple HTML form. It displays a 'Buy Now' button on HTML page and after clicking on it redirects to PayPal site. Where it ask to login to buy product but after that it goes on displaying message: The email address or password you have entered does not match our records. Please try again. I am using buyer user to purchase product. I am pretty sure about the username and password.
Providing here the simple HTML form which I am trying:
<form action="https://www.paypal.com/cgi-bin/webscr" method="post" id="payPalForm">
<input type="hidden" name="item_number" value="1">
<input type="hidden" name="cmd" value="_xclick">
<input type="hidden" name="no_note" value="1"><br>
<input type="hidden" name="business" value="sellr1_1252495907_biz#gmail.com">
<input type="hidden" name="lc" value="US">
<input type="hidden" name="button_subtype" value="services">
<input type="hidden" name="cn" value="Add special instructions to the seller">
<input type="hidden" name="no_shipping" value="2">
<input type="hidden" name="rm" value="1">
<input type="hidden" name="bn" value="PP-BuyNowBF:btn_paynow_SM.gif:NonHosted">
<input type="hidden" name="variables" value="http://google.com">
<input type="hidden" name="cancel_return" value="http://google.com">
<input type="hidden" name="notify_url" value="http://google.com">
<input type="hidden" name="return" value="http://freelanceswitch.com/payment-complete /">
<input type="hidden" name="currency_code" value="USD">
<input name="item_name" type="hidden" value="Deal Name">
<input name="amount" type="hidden" value="500">
<input type="submit" name="Submit" value="Submit">
</form>
Please advice. Thank you.

As Lazarus has pointed out you are using the wrong address for your form action. You are posting to the live PayPal service - The sandbox is what it is, its a dev version of the live Paypal... why shouldn't the Sandbox environment ask you Credit Card details, how else would you test your check out process?
Obviously the sandbox environment uses dummy credit card numbers.
Anyway, I believe the address you need for your form action method is:
https://www.sandbox.paypal.com/cgi-bin/webscr
Your hidden fields look ok :)
Also please consider marking answers once you feel your questions have been answered - just click on the outline 'tick' for whichever answer you feel is best.

How can I tell which submit button was clicked

I have several different submit buttons on my JSP in one form tag that all point to the same servlet. I need to know which submit button was clicked. How can I find out which button was clicked?

if request.getParameter("button-name") is not null then this is the button that was pressed

Each Submit button should have a different name:
<input type="submit" value="This is a submit button" name="submit1">
<input type="submit" value="Another submit button" name="submit2">
<input type="submit" value="Yet another submit button!" name="submit3">
Then, the name of the input should appear in the parameters sent to wherever the form is posting to, something like
post.jsp?key=value&submit3=&....
http://www.w3schools.com/tags/tag_input.asp

This is kind of similar to the DispatchAction in Struts. What they do is to have a hidden field, and when you submit the form, have onClick() set the value to specify which action is taken.
<input type="hidden" name="dispatchAction"/>
<input type="submit" value="Edit" onClick="setDispatchAction('edit')">
<input type="submit" value="Delete" onClick="setDispatchAction('delete')">

<button type="submit" name="somename" value="button1">some text</button>
<button type="submit" name="somename" value="button2">some other text</button>
you will have the post variable "somename" set to the according value, no matter the dispalyed value.