CustomErrorController.java

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package edu.ucsb.cs156.courses.controllers;
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import jakarta.servlet.RequestDispatcher;
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import jakarta.servlet.http.HttpServletRequest;
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import org.springframework.boot.web.servlet.error.ErrorController;
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import org.springframework.http.HttpStatus;
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import org.springframework.stereotype.Controller;
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import org.springframework.ui.Model;
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import org.springframework.web.bind.annotation.RequestMapping;
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/**
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 * Custom error controller that replaces the default white label error page with a more
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 * user-friendly error page.
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 */
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@Controller
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public class CustomErrorController implements ErrorController {
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  /**
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   * Handles error requests and returns a custom error page.
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   *
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   * @param request the HTTP request
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   * @param model the model to pass attributes to the view
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   * @return the name of the error view template
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   */
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  @RequestMapping("/error")
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  public String handleError(HttpServletRequest request, Model model) {
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    // Get error status
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    Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
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    int statusCode =
30 1 1. handleError : negated conditional → KILLED
 
        (status != null)
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            ? Integer.parseInt(status.toString())
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            : 500; // Default to internal server error
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    // Get error message
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    String message =
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        switch (statusCode) {
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          case 404 -> "The page you are looking for might have been removed or is temporarily unavailable";
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          case 403 -> "You don't have permission to access this resource";
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          case 500 -> "We're sorry, something went wrong on our end";
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          default -> "An unexpected error occurred";
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        };
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    // Get exception details for debugging
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    Throwable throwable = (Throwable) request.getAttribute(RequestDispatcher.ERROR_EXCEPTION);
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    // Add attributes to the model
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    model.addAttribute("status", statusCode);
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    model.addAttribute("error", HttpStatus.valueOf(statusCode).getReasonPhrase());
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    model.addAttribute("message", message);
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    model.addAttribute(
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        "exceptionMessage",
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        throwable != null ? throwable.getMessage() : "No exception details available");
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    model.addAttribute("stackTrace", throwable != null ? stackToString(throwable) : "");
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    model.addAttribute("timestamp", java.time.LocalDateTime.now());
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    model.addAttribute("path", request.getAttribute(RequestDispatcher.ERROR_REQUEST_URI));
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57 1 1. handleError : replaced return value with "" for edu/ucsb/cs156/courses/controllers/CustomErrorController::handleError → KILLED
 
    return "error";
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  }
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  /**
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   * Converts a Throwable's stack trace to a single string with line breaks.
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   *
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   * @param t the Throwable whose stack trace is to be converted
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   * @return a String representation of the stack trace
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   */
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  private String stackToString(Throwable t) {
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    StringBuilder sb = new StringBuilder();
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    for (StackTraceElement e : t.getStackTrace()) {
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      sb.append(e.toString()).append("\n");
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    }
71 1 1. stackToString : replaced return value with "" for edu/ucsb/cs156/courses/controllers/CustomErrorController::stackToString → KILLED
 
    return sb.toString();
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  }
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}

Mutations

30

1.1
Location : handleError
Killed by : edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests.[engine:junit-jupiter]/[class:edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests]/[method:testHandleError_DefaultStatus()] negated conditional → KILLED

52

1.1
Location : handleError
Killed by : edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests.[engine:junit-jupiter]/[class:edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests]/[method:testHandleError_DefaultStatus()] negated conditional → KILLED

53

1.1
Location : handleError
Killed by : edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests.[engine:junit-jupiter]/[class:edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests]/[method:testHandleError_DefaultStatus()] negated conditional → KILLED

57

1.1
Location : handleError
Killed by : edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests.[engine:junit-jupiter]/[class:edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests]/[method:testHandleError_DefaultStatus()] replaced return value with "" for edu/ucsb/cs156/courses/controllers/CustomErrorController::handleError → KILLED

71

1.1
Location : stackToString
Killed by : edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests.[engine:junit-jupiter]/[class:edu.ucsb.cs156.courses.controllers.CustomErrorControllerTests]/[method:testHandleError_500()] replaced return value with "" for edu/ucsb/cs156/courses/controllers/CustomErrorController::stackToString → KILLED

Active mutators

Tests examined


Report generated by PIT 1.17.0