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Method Not Allowed REST Java when trying to do POST

I just want to create a simple REST service and it uses #GET and #POST.
for the #GET function, everything is ok but for #POST, when I want to create a new user on my server the browser just keeps sating (METHOD NOT ALLOWED).
I read so many articles about how to fix this error but I haven't got anything yet.
My code for #POST :
#Path("/hello")
public class HelloResource(){
#POST
#Produces(MediaType.APPLICATION_JSON)
#Path("/post")
public Response createUser(#PathParam("name") String name,#PathParam("address") String address,#PathParam("birthYear") String birth,#PathParam("ps") String password) throws NotAllowedException,MethodNotFoundException,Exception {
DataStore.getInstance().putPerson(new Person(name, address, Integer.parseInt(birth), password));
String json = "{\n";
json += "\"status\": " + '"'+"CREATED" +'"'+ ",\n";
json+="}";
return Response.status(200).entity(json).build();
}}
I also tried adding #Consumes function with (MediaType.APPLICATION.JSON) and (MediaType.TEXT_PLAIN) but nothing changed.
Also the URL I enter for posting is :
http://localhost:8080/HelloREST/rest/hello/post?name=PouYad&address=mustbejsonlater&birthYear=2005&ps=12345
As you see I also tried so many exception handlers.
Can someone please help?

if you enter your URL in the browser URL address field, it won't work because the browser will send a "GET" request. So you must use a client that will allow you to send a "POST" like PostMan. Or write your own small httpConnection function that sends a "POST"
You also have to change the #PathParam to #FormParam for it to work (#QueryParam will also work, but because it is POST, it is best to use #FormParm).

Access URL directly through browser can only create Get Request, not POST Request
You should
Create HTML Form, set the action to your service url with POST method, and then submit it.
Use Rest Client like postman to access your service with POST method.
Write your own Http Client using java.net.http api or just simply use
one of the handy libraries/frameworks (Like Spring has RestTemplate).

GET call with request body - request body not accessible at controller

I am trying to do a get call with request body(JSON) as the request parameter list exceeds the limit. I am able to send the request via postman/insomnia and request is reaching till controller without any error. But the "requstBody" is empty at controller. What i am missing here?
#GET
#Path("\path")
#Consumes(APPLICATION_JSON)
#Produces(APPLICATION_JSON)
public Response getResponse(String requestBody) throws IOException { }
When I replaced #GET with #POST, requestBody has value. For GET call do we need to add anything more?

I am trying to do a get call with request body(JSON) as the request parameter list exceeds the limit. I am able to send the request via postman/insomnia and request is reaching till controller without any error. But the "requstBody" is empty at controller. What i am missing here?
One thing you are missing is the fact that the semantics of a request body with GET are not well defined.
RFC 7231, Section 4.3.1:
A payload within a GET request message has no defined semantics; sending a payload body on a GET request might cause some existing implementations to reject the request.

There are two ways for sending parameters in an Http Get method. PathVariable and RequestParam. In this way, sent parameters are visible in the request URL. for example:
www.sampleAddress.com/countries/{parameter1}/get-time?city=someValues
In the above request, parameter1 is a path variable and parameter2 is a request parameter. So an example of a valid URL would be:
www.sampleAddress.com/countries/Germany/get-time?city=berlin
To access these parameters in a java controller, you need to define a specific name for the parameters. For example the following controller will receive this type of requests:
#GetMapping(value = "/countries/{parameter1}/get-time", produces = "application/json; charset=utf-8")
public String getTimeOfCities(
#PathVariable(value = "parameter1") String country,
#RequestParam(value = "city") String city
){
return "the method is not implemented yet";
}
You are able to send RequestBody through a Get request but it is not recommended according to this link.
yes, you can send a body with GET, and no, it is never useful
to do so.
This elaboration in elasticsearch website is nice too:
The HTTP libraries of certain languages (notably JavaScript) don’t allow GET requests to have a request body. In fact, some users are suprised that GET requests are ever allowed to have a body.
The truth is that RFC 7231—the RFC that deals with HTTP semantics and
content—does not define what should happen to a GET request with a
body! As a result, some HTTP servers allow it, and some—especially
caching proxies—don’t.
If you want to use Post method, you are able to have RequestBody too. In the case you want to send data by a post request, an appropriate controller would be like this:
#PostMapping(value = "/countries/{parameter1}/get-time", produces = "application/json; charset=utf-8")
public String getTimeOfCitiesByPost(
#PathVariable(value = "parameter1") String country,
#RequestParam(value = "city") String city,
#RequestBody Object myCustomObject
){
return "the method is not implemented yet";
}
myCustomObject could have any type of data you defined in your code. Note that in this way, you should send request body as a Json string.

put #RequestBody on String requestBody parameter

#RequestMapping("/path/{requestBody}")
public Response getResponse(#PathVariable String requestBody) throws IOException { }

How to pass a json object as a parameter in a REST request URL with Springboot

I have looked at the various answers and they do not resolve my issue. I have a very specific client need where I cannot use the body of the request.
I have checked these posts:
Trying to use Spring Boot REST to Read JSON String from POST
Parsing JSON in Spring MVC using Jackson JSON
Pass JSON Object in Rest web method
Note: I do encode the URI.
I get various errors but illegal HTML character is one. The requirement is quite simple:
Write a REST service which accepts the following request
GET /blah/bar?object=object11&object=object2&...
object is a POJO that will come in the following JSON format
{
"foo": bar,
"alpha": {
"century": a,
}
}
Obviously I will be reading in a list of object...
My code which is extremely simplified... as below.
#RequestMapping(method=RequestMethod.GET, path = "/test")
public Greeting test(#RequestParam(value = "object", defaultValue = "World") FakePOJO aFilter) {
return new Greeting(counter.incrementAndGet(), aFilter.toString());
}
I have also tried to encapsulate it as a String and convert later which doesnt work either.
Any suggestions? This should really be extremely simple and the hello world spring rest tut should be a good dummy test framework.
---- EDIT ----
I have figured out that there is an underlying with how jackson is parsing the json. I have resolved it but will be a write up.. I will provide the exact details after Monday. Short version. To make it work for both single filter and multiple filters capture it as a string and use a json slurper

If you use #RequestParam annotation to a Map<String, String> or MultiValueMap<String, String> argument, the map will be populated with all request parameters you specified in the URL.
#GetMapping("/blah/bar")
public Greeting test(#RequestParam Map<String, String> searchParameters) {
...
}
check the documentation for a more in depth explanation.

Dynamically passing JSON/XML to REST web services

I have created a REST web services. Now the application which calls my web services says that will send a Header as RESPONSETYPE with value as JSON or XML. Based on this, I need to produce the response in json/xml. I understand that the Accept header can be used by sending the value as application/xml or application/json. But how can I achieve the dynamic response based on the custom header RESPONSETYPE?
Thanks in advance.

You should be able to do this by setting the MediaType explicitly in your Response object.
#GET
#Produces({MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML})
public Response getSomething(#HeaderParam("your-customer-header") String customHeaderType) {
return Response.ok(thingYouWantToReturn, mediaTypeFrom(customHeaderType)).build();
}
mediaTypeFrom is a method you'll need to determine what the actual MediaType to return is

java restful service client accepting list of response

I am trying to write a java client for restful resource. The response for my request is a list of objects. I have the following code for the request. BUt i get some unmarshall exception. Could anyone let me know how to solve this ?
GenericType<List<Response>> genType = new GenericType<List<Response>>() {};
GenericType<List<Response>> response = (GenericType<List<Response>>)resource.path(paramPath).accept(MediaType.APPLICATION_JSON).get(genType);
my resource has the following code
#GET
#Path("/app/{Id}")
#Produces(MediaType.APPLICATION_JSON)
public List<Response> getAllKeyValuesByAppId(#PathParam("Id") Long Id){
...
...
}

Can you test you REST method without unmarshaling?
Are you sure that the message body contains exactly what you expect?