FormDataParam not working in JAX-RS POST

I JAX-RS isn't working correctly. As illustrated in its websites, and other websites, it should be working correctly.

@POST
@Path("/foo")
@Produces("application/json")
@Consume("multipart/form-data")
public String foo(
        @FormDataParam("file") InputStream stream,
        @FormDataParam("file") FormDataContentDisposition fileDetail){

    return fileDetail.getFileName();        

}

The return is 404 Not Found. It seems like the file I was uploading didn't get recognized. Looking at examples at http://ift.tt/1tsCYip , it should have been working.

So, I tried another.

@POST
@Path("/foo")
@Produces("application/json")
@Consume("multipart/form-data")
public String foo(
        @FormDataParam("file") String display){

    return display;    

}

The result in this case is form's all data, not only file's data.

I had following html:

        <form name="Nirmal" action="webresources/gene" method="POST" enctype="multipart/form-data">

        <input type="file" name="file"/>

        <input type="submit" value="Submit" name="Submit" />
    </form>

I uploaded a simple text file "okay.txt" with content "it doesn't work!!".

The result was this.

404 Not Found

It has to do something with parameters that I think is not suitable How to make it work?