Add and enforce spring checkstyle configurations

src/test/java/org/springframework/guice/SuperClassTests.java

@@ -1,3 +1,19 @@
+/*
+ * Copyright 2019-2022 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 org.springframework.guice;
 
 import com.google.inject.AbstractModule;
@@ -346,7 +362,7 @@ public class SuperClassTests {
 	static class DisableJITConfig {
 
 		@Bean
-		public AbstractModule disableJITModule() {
+		AbstractModule disableJITModule() {
 			return new AbstractModule() {
 				@Override
 				protected void configure() {
@@ -362,27 +378,27 @@ public class SuperClassTests {
 	static class ModulesConfig extends DisableJITConfig {
 
 		@Bean
-		public IGrandChild iGrandChild() {
+		IGrandChild iGrandChild() {
 			return new IGrandChildImpl();
 		}
 
 		@Bean
-		public IGrandChildWithType<String> iChildString() {
+		IGrandChildWithType<String> iChildString() {
 			return new IGrandChildString();
 		}
 
 		@Bean
-		public IGrandChildWithType<Integer> iChildInteger() {
+		IGrandChildWithType<Integer> iChildInteger() {
 			return new IGrandChildInteger();
 		}
 
 		@Bean
-		public SubFoo subFoo() {
+		SubFoo subFoo() {
 			return new SubFoo();
 		}
 
 		@Bean
-		public SubStringFoo stringFoo() {
+		SubStringFoo stringFoo() {
 			return new SubStringFoo();
 		}