Spring 源码调试问题 ( List.of(“bin“, “build“, “out“)； )

Spring 源码调试问题

一、问题描述

错误：springframework\buildSrc\src\main\java\org\springframework\build\CheckstyleConventions.java:68: 错误: 找不到符号
List<String> buildFolders = List.of("bin", "build", "out");
^
符号：方法 of(java.lang.String,java.lang.String,java.lang.String)

位置：接口 java.util.List

源码错误文件如下

/*
 * Copyright 2002-2024 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.build;

import java.io.File;
import java.nio.file.Path;
import java.util.List;

import io.spring.javaformat.gradle.SpringJavaFormatPlugin;
import io.spring.nohttp.gradle.NoHttpExtension;
import io.spring.nohttp.gradle.NoHttpPlugin;
import org.gradle.api.Plugin;
import org.gradle.api.Project;
import org.gradle.api.artifacts.DependencySet;
import org.gradle.api.plugins.JavaBasePlugin;
import org.gradle.api.plugins.quality.Checkstyle;
import org.gradle.api.plugins.quality.CheckstyleExtension;
import org.gradle.api.plugins.quality.CheckstylePlugin;

/**
 * {@link Plugin} that applies conventions for checkstyle.
 *
 * @author Brian Clozel
 */
public class CheckstyleConventions {

	/**
	 * Applies the Spring Java Format and Checkstyle plugins with the project conventions.
	 * @param project the current project
	 */
	public void apply(Project project) {
		project.getPlugins().withType(JavaBasePlugin.class, (java) -> {
			if (project.getRootProject() == project) {
				configureNoHttpPlugin(project);
			}
			project.getPlugins().apply(CheckstylePlugin.class);
			project.getTasks().withType(Checkstyle.class).forEach(checkstyle -> checkstyle.getMaxHeapSize().set("1g"));
			CheckstyleExtension checkstyle = project.getExtensions().getByType(CheckstyleExtension.class);
			checkstyle.setToolVersion("10.14.2");
			checkstyle.getConfigDirectory().set(project.getRootProject().file("src/checkstyle"));
			String version = SpringJavaFormatPlugin.class.getPackage().getImplementationVersion();
			DependencySet checkstyleDependencies = project.getConfigurations().getByName("checkstyle").getDependencies();
			checkstyleDependencies.add(
					project.getDependencies().create("io.spring.javaformat:spring-javaformat-checkstyle:" + version));
		});
	}

	private static void configureNoHttpPlugin(Project project) {
		project.getPlugins().apply(NoHttpPlugin.class);
		NoHttpExtension noHttp = project.getExtensions().getByType(NoHttpExtension.class);
		noHttp.setAllowlistFile(project.file("src/nohttp/allowlist.lines"));
		noHttp.getSource().exclude("**/test-output/**", "**/.settings/**",
				"**/.classpath", "**/.project", "**/.gradle/**");
		List<String> buildFolders = List.of("bin", "build", "out"); // 错误位置
		project.allprojects(subproject -> {
			Path rootPath = project.getRootDir().toPath();
			Path projectPath = rootPath.relativize(subproject.getProjectDir().toPath());
			for (String buildFolder : buildFolders) {
				Path innerBuildDir = projectPath.resolve(buildFolder);
				noHttp.getSource().exclude(innerBuildDir + File.separator + "**");
			}
		});
	}

}

二、解决方案

Gradle JVM 版本过低，需要在 Java 8 版本以上，建议 Java 17，因为官方 Spring 版本用的就是 Java 17

将 Settings 里面的 gradle JVM 配置设置为 Java 17 即可