Override BasicErrorController in spring boot to disable whitelabel page and to remove the default error return

CustomErrorController.class

import java.util.Map;

import jakarta.servlet.RequestDispatcher;
import jakarta.servlet.http.HttpServletRequest;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

/**
 * Hide spring boot internals and exceptions which the client should not see.
 *
 * Example:
 * CURL/Postman to unknown path -> Empty body via error() with 404 status
 * Browser call to unknown path -> Empty body via errorHtml() with 404 status
 */
@Controller
@RequestMapping("${server.error.path:${error.path:/error}}")
public class CustomErrorController implements ErrorController {

    /**
     * Disables default spring error resource with list of attributes
     */
    @RequestMapping
    public ResponseEntity<Map<String, Object>> error(HttpServletRequest request) {
        HttpStatus status = getStatus(request);
        return new ResponseEntity<>(status);
    }

    /**
     * Disables whitelist label page
     */
    @RequestMapping(produces = MediaType.TEXT_HTML_VALUE)
    public ResponseEntity<Map<String, Object>> errorHtml(HttpServletRequest request) {
        HttpStatus status = getStatus(request);
        return new ResponseEntity<>(status);
    }

    protected HttpStatus getStatus(HttpServletRequest request) {
        Integer statusCode = (Integer) request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
        if (statusCode == null) {
            return HttpStatus.INTERNAL_SERVER_ERROR;
        }
        try {
            return HttpStatus.valueOf(statusCode);
        }
        catch (Exception ex) {
            return HttpStatus.INTERNAL_SERVER_ERROR;
        }
    }
}

CustomErrorControllerIntegrationTest

import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
import org.hamcrest.Matchers;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.context.junit.jupiter.SpringExtension;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.result.MockMvcResultMatchers;

@ExtendWith(SpringExtension.class)
@SpringBootTest
@AutoConfigureMockMvc
class CustomErrorControllerITest {

    @Autowired
    private MockMvc mockMvc;

    @Test
    void getRequestWithunmappedPathForJSONReturnsCorrectly404WithEmptyBody() throws Exception {
        mockMvc.perform(
                get("/not-mapped-path").accept(MediaType.APPLICATION_JSON)
            )
            .andExpect(MockMvcResultMatchers.status().isNotFound())
            .andExpect(MockMvcResultMatchers.content().string(Matchers.blankString()));
    }

    @Test
    void getRequestWithUnmappedPathForHTMLReturnsCorrectly404WithEmptyBody() throws Exception {
        mockMvc.perform(
                get("/not-mapped-path").accept(MediaType.TEXT_HTML)
            )
            .andExpect(MockMvcResultMatchers.status().isNotFound())
            .andExpect(MockMvcResultMatchers.content().string(Matchers.blankString()));
    }
}