在部署Spring Boot Okta应用时，如果遇到SunCertPathBuilderException异常，可能是由于证书问题导致的。下面是解决该问题的一些方法。

方法1：导入缺失的根证书

import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import javax.net.ssl.SSLContext;
import javax.net.ssl.TrustManager;
import javax.net.ssl.TrustManagerFactory;
import javax.net.ssl.X509TrustManager;

public class CustomTrustManager implements X509TrustManager {

    private X509TrustManager defaultTrustManager;

    public CustomTrustManager() throws Exception {
        TrustManagerFactory factory = TrustManagerFactory.getInstance(TrustManagerFactory.getDefaultAlgorithm());
        factory.init((KeyStore) null);
        TrustManager[] trustManagers = factory.getTrustManagers();
        if (trustManagers.length == 0) {
            throw new Exception("Failed to initialize TrustManagerFactory");
        }
        defaultTrustManager = (X509TrustManager) trustManagers[0];
    }

    @Override
    public void checkClientTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
        defaultTrustManager.checkClientTrusted(arg0, arg1);
    }

    @Override
    public void checkServerTrusted(X509Certificate[] arg0, String arg1) throws CertificateException {
        try {
            defaultTrustManager.checkServerTrusted(arg0, arg1);
        } catch (CertificateException ce) {
            // Handle the exception as per your requirement
        }
    }

    @Override
    public X509Certificate[] getAcceptedIssuers() {
        return defaultTrustManager.getAcceptedIssuers();
    }

    public static void disableSSLValidation() throws Exception {
        SSLContext sslContext = SSLContext.getInstance("TLS");
        sslContext.init(null, new TrustManager[]{new CustomTrustManager()}, null);
        HttpsURLConnection.setDefaultSSLSocketFactory(sslContext.getSocketFactory());
    }
}

然后在Spring Boot应用的main方法中调用CustomTrustManager.disableSSLValidation()方法来禁用SSL验证。

方法2：添加缺失的根证书到证书存储库 将缺失的根证书添加到Java的证书存储库中，可以使用以下命令将证书导入到cacerts存储库中：

$ keytool -import -alias mycert -file mycert.cer -keystore cacerts

方法3：忽略SSL验证 如果不关心SSL验证，可以在应用的配置文件中添加以下配置：

server.ssl.enabled=false

这将禁用SSL验证。

请注意，以上方法中的代码示例是用于解决SunCertPathBuilderException异常的常见方法，具体的解决方法可能因应用的具体情况而异。