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这篇文章记录了下载spring源码和在IDEA中打开运行的全过程，并且记录了过程中遇到的问题和解决方案，适合需要学习spring源码的同学阅读。
1.spring源码下载地址
通过Git下载spring-framework项目源码：
git clone https://github.com/spring-projects/spring-framework.git
2.使用IDEA构建spring-framework源码
笔者用的IDEA版本是社区版IDEA：IntelliJ IDEA 2020.34(Community Edition)，用IDEA打开源码后，IDEA会自动加载Gradle项目依赖。
然后这里就遇到了第一个问题：
2.1 SSL证书验证不通过（无该问题可跳过）
SunCertPathBuilderException: unable to find valid certification path to requested target - Mkyong.com
javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building_迷茫期。。。的博客-CSDN博客
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested targetat sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:439)at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:306)at sun.security.validator.Validator.validate(Validator.java:271)at sun.security.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:312)at sun.security.ssl.X509TrustManagerImpl.checkTrusted(X509TrustManagerImpl.java:221)at sun.security.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:128)at sun.security.ssl.CertificateMessage$T12CertificateConsumer.checkServerCerts(CertificateMessage.java:630)... 126 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested targetat sun.security.provider.certpath.SunCertPathBuilder.build(SunCertPathBuilder.java:141)at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:126)at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:280)at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:434)> Task :buildSrc:compileJava FAILED
1 actionable task: 1 executedA build scan was not published as you have not authenticated with server 'ge.spring.io'.
For more information, please see https://gradle.com/help/gradle-authenticating-with-gradle-enterprise.
The remote build cache was disabled during the build due to errors.2.1.1 新建InstallCert .java文件
/*- Copyright 2006 Sun Microsystems, Inc. All Rights Reserved.- - Redistribution and use in source and binary forms, with or without- modification, are permitted provided that the following conditions- are met:- - - Redistributions of source code must retain the above copyright- notice, this list of conditions and the following disclaimer.- - - Redistributions in binary form must reproduce the above copyright- notice, this list of conditions and the following disclaimer in the- documentation and/or other materials provided with the distribution.- - - Neither the name of Sun Microsystems nor the names of its- contributors may be used to endorse or promote products derived- from this software without specific prior written permission.- - THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS- IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,- THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR- PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR- CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,- EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,- PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR- PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING- NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS- SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.*/import java.io.*;
import java.net.URL;import java.security.*;
import java.security.cert.*;import javax.net.ssl.*;public class InstallCert {public static void main(String[] args) throws Exception {String host;int port;char[] passphrase;if ((args.length == 1) || (args.length == 2)) {String[] c = args[0].split(":");host = c[0];port = (c.length == 1) ? 443 : Integer.parseInt(c[1]);String p = (args.length == 1) ? "changeit" : args[1];passphrase = p.toCharArray();} else {System.out.println("Usage: java InstallCert <host>[:port] [passphrase]");return;}File file = new File("jssecacerts");if (file.isFile() == false) {char SEP = File.separatorChar;File dir = new File(System.getProperty("java.home") + SEP+ "lib" + SEP + "security");file = new File(dir, "jssecacerts");if (file.isFile() == false) {file = new File(dir, "cacerts");}}System.out.println("Loading KeyStore " + file + "...");InputStream in = new FileInputStream(file);KeyStore ks = KeyStore.getInstance(KeyStore.getDefaultType());ks.load(in, passphrase);in.close();SSLContext context = SSLContext.getInstance("TLS");TrustManagerFactory tmf =TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());tmf.init(ks);X509TrustManager defaultTrustManager = (X509TrustManager)tmf.getTrustManagers()[0];SavingTrustManager tm = new SavingTrustManager(defaultTrustManager);context.init(null, new TrustManager[] {tm}, null);SSLSocketFactory factory = context.getSocketFactory();System.out.println("Opening connection to " + host + ":" + port + "...");SSLSocket socket = (SSLSocket)factory.createSocket(host, port);socket.setSoTimeout(10000);try {System.out.println("Starting SSL handshake...");socket.startHandshake();socket.close();System.out.println();System.out.println("No errors, certificate is already trusted");} catch (SSLException e) {System.out.println();e.printStackTrace(System.out);}X509Certificate[] chain = tm.chain;if (chain == null) {System.out.println("Could not obtain server certificate chain");return;}BufferedReader reader =new BufferedReader(new InputStreamReader(System.in));System.out.println();System.out.println("Server sent " + chain.length + " certificate(s):");System.out.println();MessageDigest sha1 = MessageDigest.getInstance("SHA1");MessageDigest md5 = MessageDigest.getInstance("MD5");for (int i = 0; i < chain.length; i++) {X509Certificate cert = chain[i];System.out.println(" " + (i + 1) + " Subject " + cert.getSubjectDN());System.out.println(" Issuer " + cert.getIssuerDN());sha1.update(cert.getEncoded());System.out.println(" sha1 " + toHexString(sha1.digest()));md5.update(cert.getEncoded());System.out.println(" md5 " + toHexString(md5.digest()));System.out.println();}System.out.println("Enter certificate to add to trusted keystore or 'q' to quit: [1]");String line = reader.readLine().trim();int k;try {k = (line.length() == 0) ? 0 : Integer.parseInt(line) - 1;} catch (NumberFormatException e) {System.out.println("KeyStore not changed");return;}X509Certificate cert = chain[k];String alias = host + "-" + (k + 1);ks.setCertificateEntry(alias, cert);OutputStream out = new FileOutputStream("jssecacerts");ks.store(out, passphrase);out.close();System.out.println();System.out.println(cert);System.out.println();System.out.println("Added certificate to keystore 'jssecacerts' using alias '"+ alias + "'");}private static final char[] HEXDIGITS = "0123456789abcdef".toCharArray();private static String toHexString(byte[] bytes) {StringBuilder sb = new StringBuilder(bytes.length * 3);for (int b : bytes) {b &= 0xff;sb.append(HEXDIGITS[b >> 4]);sb.append(HEXDIGITS[b & 15]);sb.append(' ');}return sb.toString();}private static class SavingTrustManager implements X509TrustManager {private final X509TrustManager tm;private X509Certificate[] chain;SavingTrustManager(X509TrustManager tm) {this.tm = tm;}public X509Certificate[] getAcceptedIssuers() {throw new UnsupportedOperationException();}public void checkClientTrusted(X509Certificate[] chain, String authType)throws CertificateException {throw new UnsupportedOperationException();}public void checkServerTrusted(X509Certificate[] chain, String authType)throws CertificateException {this.chain = chain;tm.checkServerTrusted(chain, authType);}}}
2.1.2 编译InstallCert .java
javac InstallCert.java2.1.3 运行InstallCert，生成jssecacerts文件
--输入命令（域名换成自己idea访问报错的域名或者ip）
java InstallCert ge.spring.io:443命令执行后，会要求输入数字1，生成证书文件
出现如下信息就代表安装成功
2.1.4 将同目录下生成的jssecacerts文件添加到$JAVA_HOME/jre/lib/security
2.1.5 重启IDEA（注意重启，不然可能不会生效）
这个问题这样就解决啦！
不过又出现了新的问题😂
2.2 KotlinConventions类编译失败
> Task :buildSrc:compileJava FAILED
D:\Users\project\spring-framework\buildSrc\src\main\java\org\springframework\build\KotlinConventions.java:44: ����: �Ҳ�������freeCompilerArgs.addAll(List.of("-Xsuppress-version-warnings", "-Xjsr305=strict", "-opt-in=kotlin.RequiresOptIn"));^����: ���� of(java.lang.String,java.lang.String,java.lang.String)λ��: �ӿ� java.util.List
1 ������2.2.1 问题原因
https://www.cnblogs.com/haoxianrui/p/16975079.html
笔者本地使用了jdk8，而spring源码现在已经使用了jdk 17，所以我本地的jdk不适用于spring-framework，需要重新下载jdk17
2.2.2 下载使用jdk 17
Java JDK下载与安装教程
安装之后，在Gradle设置里，使用我们下载的jdk17
问题解决
2.3 无法获取到依赖的jar包
Could not download reactor-netty5-http-2.0.0-M3.jar (io.projectreactor.netty:reactor-netty5-http:2.0.0-M3)
Could not get resource 'https://repo.spring.io/milestone/io/projectreactor/netty/reactor-netty5-http/2.0.0-M3/reactor-netty5-http-2.0.0-M3.jar'.
Could not GET 'https://jfrog-prod-use1-shared-virginia-main.s3.amazonaws.com/aol-springsource/filestore/86/865933d3682c52611968163a012ff66b9872b71a?X-Artifactory-username=anonymous&X-Artifactory-repositoryKey=libs-milestone-local&X-Artifactory-artifactPath=io%2Fprojectreactor%2Fnetty%2Freactor-netty5-http%2F2.0.0-M3%2Freactor-netty5-http-2.0.0-M3.jar&X-Artifactory-projectKey=default&x-jf-traceId=4d07ec9a25940234&response-content-disposition=attachment%3Bfilename%3D%22reactor-netty5-http-2.0.0-M3.jar%22&response-content-type=application%2Fjava-archive&X-Amz-Security-Token=FwoGZXIvYXdzECIaDHVyEGk3w71HFKwaYiKlBFzfmjii%2Fj83al2YQhVAEsu3fvEqpDokpVyh7MRIlErCfyQgqa6VeIO5vFtEZjFWqd7hdrFH2xJHqfct1IFfzWuadfgyUIATPyd1fiAVGuTtqhuz3jn4rEPVgOkGZPYaOp9YGNXP7T5UB%2BYc8aftvD8ORRKbsNkaoB4EbWmpPRtGcSGnnQUPLpccRlDqpoIUKSyiEfwrpoeuWtaJp4Y%2FYQBG6UEpq9n2NYddnTaieE5t%2ByaipzZ3RRbJPteBcuud%2FMVxeWy%2BMR7mrezhQe6TRy7Au4AX7Dm1%2FFiboXC%2BLu06o82jTMLWHBx8uxXvrzhMJ6Rk0SlFEB2YhkHLy%2BJfSrRlrCfg3t0buTjeGosZ8W59yJXrHjKIQnTx04J2KlKUUHi6i7b%2BnyNlEwCEs61BnrWZsrd89QvCOgQ7I3yA4zFUii2ugr2gj0BGgvYTKjYO6PlwkDiYu2c5Tw8kUEmDLyOxqBaVH4tkrPBY0uu29ggvrBPTOgP6puhL45TsTW3MO6V9sHFQjJrIJ9rAuAc3tHK0CoN7aQ3MxCoezjvrUN6KB%2BXVxT7ZEia%2FP%2BNec%2BLL9b0CRM7tLnJ9ly6w59y5KrnmeeAQ6%2FjWgd6lmJqS2gknMXqvGTkIHu95RTHO7dSu2yaaeqqBGnQUc%2FmQG4d5tTQdvUOgAY2nVEzTe%2BVZhnUiVFMg%2F%2BmudQWCPKZxtAnNtxhgQelur%2FEe9eFd9oNta1DOCRlKVSj7s86fBjIrtSsd354CSxF%2FP23mYpHUuWchiZXrJzk6gk%2FsmBFsOA%2FfjApBVe1mZ3RB9Q%3D%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20230220T160636Z&X-Amz-SignedHeaders=host&X-Amz-Expires=60&X-Amz-Credential=ASIA6RUGCBMHDIGDGT7Q%2F20230220%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=eff0beab0b224964c11606d240a9ec4ce6aa4cbe60db666d5157c6dfafc1811d'.
Connection resetPossible solution:- Declare repository providing the artifact, see the documentation at https://docs.gradle.org/current/userguide/declaring_repositories.html
这个要排除下是网络问题还是代理问题
先使用ping命令看下网络是不是通的
这里看到，ping命令请求超时，但是直接浏览器访问，是没问题的，再看看是不是代理问题
打开IDEA设置setting，找到HTTP Proxy，选择Auto-detect proxy setting（自动发现代理设置），然后应用
重新刷新Gradle依赖，发现开始下载依赖包了，最后BUILD SUCCESSFUL，大功告成😁
接下来就可以愉快的阅读源码啦！
后续我将会边学习边写源码阅读笔记，并同步到博客，欢迎大家多互相交流！