如何解决javax.net.ssl.SSLHandshakeException

Question

如何使用HttpClient创建HTTPS获取请求？我做了很多搜索，似乎没有什么对我有用 - 网上很多解决方案也取决于弃用的api调用:(

目前，我已按照以下链接中的代码（章节：获取服务器证书）：http://memorynotfound.com/apache-httpclient-get-server-certificates/

我的代码如下：

HttpResponseInterceptor certificateInterceptor = new HttpResponseInterceptor() {
    @Override
    public void process(HttpResponse httpResponse, HttpContext context) throws HttpException, IOException {
        ManagedHttpClientConnection routedConnection = (ManagedHttpClientConnection)context.getAttribute(HttpCoreContext.HTTP_CONNECTION);
        SSLSession sslSession = routedConnection.getSSLSession();
        if (sslSession != null) {

            // get the server certificates from the {@Link SSLSession}
            Certificate[] certificates = sslSession.getPeerCertificates();

            // add the certificates to the context, where we can later grab it from
            this.context.setAttribute(PEER_CERTIFICATES, certificates);
        }
    }
};

   this.httpClient = HttpClients
            .custom()
            .addInterceptorLast(certificateInterceptor)
            .build();

然而，这会导致以下错误：

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target

为什么我会收到此异常，如何解决？任何帮助将不胜感激！