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Spring REST Request method 'DELETE', 'POST', 'PUT' not supported [duplicate]

I have the following method in my controller
#RequestMapping(value = "processPurchase/{poid}", method = RequestMethod.DELETE)
public String processOrder(#PathVariable int poid) {
// do some processing
return acceptPurchaseForm;
}
My HTML
<form id="purchase-list-form" class="form-horizontal" action="/MyNewApp/processPurchase/" method="post">
<input type="hidden" name="_method" value="delete">
<input type="hidden" name="poid" value="">
With the above I still get the following error
WARN : org.springframework.web.servlet.PageNotFound - Request method 'DELETE' not supported
Any help appreciated.

First of all, I assume you have the HiddenHttpMethodFilter configured in your web.xml. It is required to convert your _method with value delete to the DELETE RequestMethod
Secondly, the poid is being passed in the body of the request but in your controller, you are expecting it to be passed in the URL itself. This might explain why Spring is unable to map the request.
EDIT 1:
To pass poid in URL, you will have to include in your form action when your HTML is generated. It depends on your view technology (I use Freemarker) but you would be required to do something like this:
<form action="/MyNewApp/processPurchase/${poid}" method="post">
Assuming that the poid is written to the model that is binded to your view.

Can I tell spring to ignore query parameters?

If I submit this form:
<form id="confirmForm" method="POST">
<input type="hidden" name="guid" value="guidval"/>
</form>
to this url:
/AltRT?guid=guidval
mapped to this controller method:
#RequestMapping(method = RequestMethod.POST)
public String indexPost(#RequestParam String guid)
I am getting both values for my guid. So the value of guid is guidval,guidval. I would like to only get the value from the form.
Is there any way tell Spring to ignore query string parameters?
EDIT for more clarification: The query string is left over from another (get) request. So, if I could clear the query string that would work as well. Also, I do not want edit the name of the form input because I want this post endpoint to be available to other services without having to change them as well.

You cannot do so because the query string will be sent in the HTTP message body of a POST request, http://www.w3schools.com/tags/ref_httpmethods.asp
There are two ways I could think of now
set the form attribute action
<form id="confirmForm" method="POST" action="AltRT">
<input type="hidden" name="guid" value="guidval" />
</form>
convert the form data into JSON object to send it over and then catch it with #RequestBody in Spring if you have to use the original URL.

Passing parameter back from JSP in a portlet app

In my Liferay 6 app I'm able to pass parameter from java to jsp via:
final PortletRequestDispatcher rd = getPortletContext().getRequestDispatcher("view");
request.setAttribute("description", "some description");
rd.include(request, response);
Then I want user to change the description and pass it back to back-end:
<form method="POST" action="${addItem}">
<input name="description"
type="text"
value="${description}"/>
<button type="submit">UPDATE</button>
</form>
Nevertheless when I call then System.out.println("request.getAttribute("description")); , I'm getting null. What am I doing wrong?

Youre passing in the parameter but checking the request attribute (assuming that the outer quotes are a question typo). Based on the information you provided, the initial request attribute was only available in the JSP but not any subsequent servlet. Try
System.out.println(request.getParameter("description"));

JSP pass hidden input value to servlet when the page load

I should be using getRemoteUser functionality to get the logged in user. Until the authentication part get created I am trying to hard code the user in the jsp page and pass that in the my servlet. But when I try to print out the value its null:
<input type="hidden" name="userId" id="userId" value="123456789" />
Here is how I tried to get the user:
String fakeUser = request.getParameter("userId");
PrintWriter out = response.getWriter();
out.println(fakeUser);
System.out.println(fakeUser)
I also tried the solution mentioned following Stackoverflow post but that didn't work either.
passing value from jsp to servlet

As you are trying to use hidden-form field I assume that you are trying to do some sort of state management.
try something like this
<form action="urlOfYourServlet" method="post">
Enter your name : <input type ="text" name = "name">
<input type="hidden" name="hidden" value="Welcome">
<input type="submit" value="submit">
</form>
In servlet
String getHiddenValue=request.getParameter("hidden");
String name=request.getParameter("name");
System.out.println(name+" Hidden field Value is :"+getHiddenValue);
Disadvantage :
Only textual information can be persisted between request.
This method works only when the request is submitted through input form
Instead try url-redirecting or HttpSession

Do Spring MVC controller look for ids or names?

If I have the following HTML form:
<form id="myForm" action="/myFormHandler" method="post">
<input type="hidden" id="fizz-id" name="fizz" value="3" />
<input type="hidden" id="buzz-id" name="buzz" value="6" />
</form>
(Notice no submit button). And then I have the following jQuery:
$("#someButton").click(function() {
$("#myForm").submit();
});
Then on the server-side (Spring MVC controller), do the hidden field ids or names get sent to the handler method?
#RequestMapping(value = "/myFormHandler.html", method = RequestMethod.POST)
public ModelAndView handleMyForm(
#RequestParam("fizz-id") String fizz,
#RequestParam("buzz-id") String buzz) {
// Should I be looking for "fizz-id" or "fizz"???
}
Thanks in advance.

Its the name attribute that is sent to the server, so in this case you should look for "fizz".
The id attribute is just used for client side interaction, it is not sent in the request to the server.

with a post request ,it is the name attribute of a HTML element that is used to access it using request.getParameter.