there were errors checking the update sites: sslhandshakeexception: sun.security.validator.validatorexception: pkix path building failed: sun.security.provider.certpath.suncertpathbuilderexception: unable to find valid certification path to requested target

更新站点检查时出现错误：sslhandshakeexception：sun.security.validator.validatorexception：pkix路径构建失败：sun.security.provider.certpath.suncertpathbuilderexception：无法找到请求目标的有效认证路径。

相关问题

sun.security.validator.ValidatorException: PKIX path building failed:

根据提供的引用内容，解决"sun.security.validator.ValidatorException: PKIX path building failed"的问题有两种方法：

方法一：在IDEA中配置参数
在IDEA中进行以下配置：
1. 打开项目的配置文件（例如pom.xml）。
2. 在配置文件中添加以下参数：

-Dmaven.multiModuleProjectDirectory=$MAVEN_HOME
-Dmaven.wagon.http.ssl.insecure=true
-Dmaven.wagon.http.ssl.allowall=true
-Dmaven.wagon.http.ssl.ignore.validity.dates=true

3. 保存配置文件并重新启动编译器。

方法二：生成证书文件
1. 确保你安装的JDK中的Java\jar 1.8.0_141\lib\ext目录下存在jssecacerts证书文件。
2. 如果该目录下没有该证书文件，可以通过运行以下类来生成证书：

import com.sun.net.ssl.internal.ssl.Provider;
import java.security.Security;
public class InstallCert {
    public static void main(String[] args) throws Exception {
        Security.addProvider(new Provider());
        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);
        }
    }
}

3. 运行以上类，生成的证书将会保存在当前目录下的jssecacerts文件中。
4. 将生成的证书文件放置在Java\jar 1.8.0_141\lib\ext目录下。
5. 重新启动编译器。

There were errors checking the update sites: ConnectException: Connection refused (Connection refused)

这个错误通常是由于Jenkins无法连接到更新站点引起的。有几种可能的原因：

1.更新站点URL不正确或无法访问。
2.Jenkins代理设置不正确。
3.Jenkins服务器防火墙阻止了对更新站点的访问。

以下是一些可能的解决方法：

1.检查更新站点URL是否正确，并确保可以从Jenkins服务器访问该URL。
2.如果您使用代理，请确保Jenkins代理设置正确，并且代理服务器可以访问更新站点。
3.如果您的Jenkins服务器受到防火墙保护，请确保防火墙允许对更新站点的访问。