MIME****.tmp file creation in Jersey Restful API

Question

I created a RESTfule webservice using Jersey2.0 API, which can produce and consume json MediaType.

@Path( "/PortfolioSummary" )

public class RESTWSService    
{

    public RESTWSService()
    {

    }

    @POST
    @Consumes( { MediaType.APPLICATION_JSON } )
    @Produces( { MediaType.APPLICATION_JSON } )
    public String getportfolioSummary( String req )
    {
         ----
    }
}

When I deploy the service or invoke the service, temp file like MIME43756487865.tmp is created in my AppData/local/Temp folder.

How to avoid this MIME****.tmp file creation in /Temp folder?