Fail.java

package com.example.jersey2;

import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.core.Response;

import org.springframework.stereotype.Component;

@Path("/fail")
@Component
public class Fail {

	@POST
	@Consumes(MediaType.APPLICATION_FORM_URLENCODED)
	public Response example(MultivaluedMap<String, String> values) {
		String body = "x"; // 1
		body = body + body; // 2
		body = body + body; // 4
		body = body + body; // 8
		body = body + body; // 16
		body = body + body; // 32
		body = body + body; // 64
		body = body + body; // 128
		body = body + body; // 256
		body = body + body; // 512
		body = body + body; // 1024
		body = body + body; // 2048
		body = body + body; // 4096
		body = body + body; // 8192
		body = body + 'x'; // 8193

		Response response = Response.status(Response.Status.BAD_REQUEST)
			.entity(body).build();

		return response;
	}
}