How to get a boolean variable DEBUG in a Thymeleaf?

Question

How to find out if a project is in debug mode and get a variable of a logical type in the thymeleaf template.

<h1 th:if="${DEBUG}">...</h1>

Answer 1

You can achieve this while injecting the Environment bean to your contorller:

@Controller
@RequestMapping("/public")
public class PublicController {

  private final Environment environment;

  public PublicController(Environment environment) {
    this.environment = environment;
  }

  @GetMapping("/debug")
  public String returnFoo(Model model) {

    String envValue = environment.getProperty("debug");
    boolean isDebugMode = (envValue != null && !envValue.equals("false"));
    model.addAttribute("DEBUG", isDebugMode);

    System.out.println(isDebugMode);

    return "yourView";
  }
}

This is implementation is working for every possible way you might set the debug flag to your application (How can I tell whether my Spring boot application is in debug mode?)