Group name cannot be null or empty - Fixes #2332

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/models/GroupedOpenApi.java

@@ -36,9 +36,10 @@
 import org.springdoc.core.customizers.RouterOperationCustomizer;
 import org.springdoc.core.filters.OpenApiMethodFilter;
 
+import org.springframework.util.Assert;
 import org.springframework.util.CollectionUtils;
 
-import static org.springdoc.core.utils.Constants.GROUP_NAME_NOT_NULL;
+import static org.springdoc.core.utils.Constants.GROUP_NAME_NOT_NULL_OR_EMPTY;
 
 /**
  * The type Grouped open api.
@@ -117,7 +118,8 @@ public class GroupedOpenApi {
 	 * @param builder the builder
 	 */
 	private GroupedOpenApi(Builder builder) {
-		this.group = Objects.requireNonNull(builder.group, GROUP_NAME_NOT_NULL);
+		Assert.isTrue(StringUtils.isNotBlank(builder.group), GROUP_NAME_NOT_NULL_OR_EMPTY);
+		this.group =builder.group;
 		this.pathsToMatch = builder.pathsToMatch;
 		this.packagesToScan = builder.packagesToScan;
 		this.producesToMatch = builder.producesToMatch;

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/properties/AbstractSwaggerUiConfigProperties.java

@@ -32,7 +32,7 @@
 import com.fasterxml.jackson.annotation.JsonProperty;
 import org.apache.commons.lang3.StringUtils;
 
-import static org.springdoc.core.utils.Constants.GROUP_NAME_NOT_NULL;
+import static org.springdoc.core.utils.Constants.GROUP_NAME_NOT_NULL_OR_EMPTY;
 
 /**
  * Please refer to the swagger
@@ -724,7 +724,7 @@ public SwaggerUrl() {
 		 * @param displayName the display name
 		 */
 		public SwaggerUrl(String group, String url, String displayName) {
-			Objects.requireNonNull(group, GROUP_NAME_NOT_NULL);
+			Objects.requireNonNull(group, GROUP_NAME_NOT_NULL_OR_EMPTY);
 			this.url = url;
 			this.name = group;
 			this.displayName = StringUtils.defaultIfEmpty(displayName, this.name);

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/utils/Constants.java

@@ -243,7 +243,7 @@ public final class Constants {
 	/**
 	 * The constant GROUP_NAME_NOT_NULL.
 	 */
-	public static final String GROUP_NAME_NOT_NULL = "Group name can not be null";
+	public static final String GROUP_NAME_NOT_NULL_OR_EMPTY = "Group name can not be null or empty";
 
 	/**
 	 * The constant GET_METHOD.

springdoc-openapi-starter-webmvc-api/src/test/java/test/org/springdoc/api/v30/app210/SpringDocApp210Test.java

@@ -0,0 +1,47 @@
+/*
+ *
+ *  *
+ *  *  *
+ *  *  *  *
+ *  *  *  *  * Copyright 2019-2023 the original author or authors.
+ *  *  *  *  *
+ *  *  *  *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  *  *  *  * you may not use this file except in compliance with the License.
+ *  *  *  *  * You may obtain a copy of the License at
+ *  *  *  *  *
+ *  *  *  *  *      https://www.apache.org/licenses/LICENSE-2.0
+ *  *  *  *  *
+ *  *  *  *  * Unless required by applicable law or agreed to in writing, software
+ *  *  *  *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  *  *  *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  *  *  *  * See the License for the specific language governing permissions and
+ *  *  *  *  * limitations under the License.
+ *  *  *  *
+ *  *  *
+ *  *
+ *
+ */
+
+package test.org.springdoc.api.v30.app210;
+
+import org.junit.jupiter.api.Test;
+import org.springdoc.core.models.GroupedOpenApi;
+import test.org.springdoc.api.AbstractCommonTest;
+
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.test.context.SpringBootTest;
+
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+@SpringBootTest
+public class SpringDocApp210Test extends AbstractCommonTest {
+
+	@Test
+	public void testApp(){
+		assertThrows(IllegalArgumentException.class, () -> GroupedOpenApi.builder().group("").build());
+	}
+
+	@SpringBootApplication
+	static class SpringDocTestApp {}
+
+}