Polish "Add support for cache2k in memory caching"

See gh-28498

spring-boot-project/spring-boot-docs/src/main/java/org/springframework/boot/docs/io/caching/provider/cache2k/MyCache2kDefaultsConfiguration.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright 2012-2022 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.boot.docs.io.caching.provider.cache2k;
+
+import java.util.concurrent.TimeUnit;
+
+import org.springframework.boot.autoconfigure.cache.Cache2kBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration(proxyBeanMethods = false)
+public class MyCache2kDefaultsConfiguration {
+
+	@Bean
+	public Cache2kBuilderCustomizer myCache2kDefaultsCustomizer() {
+		// @formatter:off
+		return (builder) -> builder.entryCapacity(200)
+				.expireAfterWrite(5, TimeUnit.MINUTES);
+		// @formatter:on
+	}
+
+}

spring-boot-project/spring-boot-docs/src/main/kotlin/org/springframework/boot/docs/io/caching/provider/cache2k/MyCache2kDefaultsConfiguration.kt

@@ -0,0 +1,18 @@
+package org.springframework.boot.docs.io.caching.provider.cache2k
+
+import org.springframework.boot.autoconfigure.cache.Cache2kBuilderCustomizer
+import org.springframework.context.annotation.Bean
+import org.springframework.context.annotation.Configuration
+import java.util.concurrent.TimeUnit
+
+@Configuration(proxyBeanMethods = false)
+class MyCache2kDefaultsConfiguration {
+
+	@Bean
+	fun myCache2kDefaultsCustomizer(): Cache2kBuilderCustomizer {
+		return Cache2kBuilderCustomizer { builder ->
+			builder.entryCapacity(200)
+				.expireAfterWrite(5, TimeUnit.MINUTES)
+		}
+	}
+}