added custom error controller

Author: open-schnick

src/main/java/de/filefighter/rest/rest/RestErrorController.java

@@ -0,0 +1,24 @@
+package de.filefighter.rest.rest;
+
+import org.springframework.boot.web.servlet.error.ErrorController;
+import org.springframework.hateoas.EntityModel;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+import springfox.documentation.annotations.ApiIgnore;
+
+@ApiIgnore
+@RestController
+public class RestErrorController implements ErrorController {
+
+    private static final String DEFAULT_PATH = "/error";
+
+    @RequestMapping(value = DEFAULT_PATH)
+    public EntityModel<ServerResponse> error() {
+        return new ServerResponse("denied", "This endpoint does not exist.").toModel();
+    }
+
+    @Override
+    public String getErrorPath() {
+        return DEFAULT_PATH;
+    }
+}

src/main/java/de/filefighter/rest/rest/ServerResponse.java

@@ -0,0 +1,19 @@
+package de.filefighter.rest.rest;
+
+import lombok.Data;
+import org.springframework.hateoas.EntityModel;
+
+@Data
+public class ServerResponse {
+    private String message;
+    private String status;
+
+    public ServerResponse(String status, String message) {
+        this.status = status;
+        this.message = message;
+    }
+
+    public EntityModel<ServerResponse> toModel() {
+        return EntityModel.of(this);
+    }
+}