Java tutorial
/* * Copyright 2002-2018 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.core; import org.springframework.lang.Nullable; /** * Class that exposes the Spring version. Fetches the * "Implementation-Version" manifest attribute from the jar file. * * <p>Note that some ClassLoaders do not expose the package metadata, * hence this class might not be able to determine the Spring version * in all environments. Consider using a reflection-based check instead: * For example, checking for the presence of a specific Spring 5.0 * method that you intend to call. * * @author Juergen Hoeller * @since 1.1 */ public final class SpringVersion { private SpringVersion() { } /** * Return the full version string of the present Spring codebase, * or {@code null} if it cannot be determined. * @see Package#getImplementationVersion() */ @Nullable public static String getVersion() { Package pkg = SpringVersion.class.getPackage(); return (pkg != null ? pkg.getImplementationVersion() : null); } }