Added Global Exception Handling

Author: MarcelCoding

admin-panel/src/main/java/net/cryptic_game/backend/admin/Bootstrap.java

@@ -1,22 +1,35 @@
 package net.cryptic_game.backend.admin;
 
+import java.security.Principal;
+import java.util.stream.Collectors;
+
+import net.getnova.framework.core.GlobalErrorWebExceptionHandler;
 import net.getnova.framework.core.NovaBanner;
 import org.springdoc.core.GroupedOpenApi;
+import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.autoconfigure.web.ResourceProperties;
+import org.springframework.boot.autoconfigure.web.ServerProperties;
+import org.springframework.boot.autoconfigure.web.WebProperties;
+import org.springframework.boot.autoconfigure.web.reactive.error.AbstractErrorWebExceptionHandler;
 import org.springframework.boot.builder.SpringApplicationBuilder;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.web.reactive.error.ErrorAttributes;
+import org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler;
+import org.springframework.context.ApplicationContext;
 import org.springframework.context.annotation.Bean;
+import org.springframework.core.annotation.Order;
 import org.springframework.http.HttpHeaders;
 import org.springframework.http.MediaType;
+import org.springframework.http.codec.ServerCodecConfigurer;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RestController;
 import org.springframework.web.reactive.function.client.WebClient;
+import org.springframework.web.reactive.result.view.ViewResolver;
 import org.springframework.web.server.WebSession;
 
-import java.security.Principal;
-
 @SpringBootApplication
 @RestController
 @EnableConfigurationProperties(Config.class)
@@ -61,4 +74,27 @@ GroupedOpenApi serverApi() {
                 .pathsToMatch("/server_management/**")
                 .build();
     }
+
+    @Bean
+    @Order(-2)
+    public ErrorWebExceptionHandler errorWebExceptionHandler(
+            final ErrorAttributes errorAttributes,
+            final ResourceProperties resourceProperties,
+            final WebProperties webProperties,
+            final ApplicationContext applicationContext,
+            final ServerProperties serverProperties,
+            final ObjectProvider<ViewResolver> viewResolvers,
+            final ServerCodecConfigurer serverCodecConfigurer
+    ) {
+        final AbstractErrorWebExceptionHandler exceptionHandler = new GlobalErrorWebExceptionHandler(
+                errorAttributes,
+                resourceProperties.hasBeenCustomized() ? resourceProperties : webProperties.getResources(),
+                applicationContext,
+                serverProperties.getError()
+        );
+        exceptionHandler.setViewResolvers(viewResolvers.orderedStream().collect(Collectors.toList()));
+        exceptionHandler.setMessageWriters(serverCodecConfigurer.getWriters());
+        exceptionHandler.setMessageReaders(serverCodecConfigurer.getReaders());
+        return exceptionHandler;
+    }
 }