javax.net.ssl.SSLException: untrusted server cert chain issue

When reading the content from a HTTPS connection, a javax.net.ssl.SSLException: untrusted server cert chain can be thrown for untrusted servers. To force reading from such untrusted servers, this method installs a 'all-trustung' trust manager that returns 'true' for all servers. Just call this method and install a dummy host name verifier to read data from any uncertified server.

static public void trustHttpsCertificates() throws Exception {
       
        Security.addProvider(new com.sun.net.ssl.internal.ssl.Provider());
       
        //Create a trust manager that does not validate certificate chains:
        TrustManager[] trustAllCerts = new TrustManager[] {
                new X509TrustManager() {
                    public X509Certificate[] getAcceptedIssuers() {
                        return null;
                    }
                    public void checkServerTrusted(X509Certificate[] certs, String authType) throws CertificateException {
                        return;
                    }
                    public void checkClientTrusted(X509Certificate[] certs, String authType) throws CertificateException {
                        return;
                    }
                }//X509TrustManager
        };//TrustManager[]
       
        //Install the all-trusting trust manager:
        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, new SecureRandom());
        //SSLSocketFactory sf = sc.getSocketFactory();
        //System.out.println(sf.getClass());
        //System.out.println(HttpsURLConnection.getDefaultSSLSocketFactory().getClass());
        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
       
        //avoid "HTTPS hostname wrong: should be <myhostname>" exception:
        HostnameVerifier hv = new HostnameVerifier() {
            public boolean verify(String urlHostName, SSLSession session) {
                if (!urlHostName.equalsIgnoreCase(session.getPeerHost())) {
                    System.out.println("Warning: URL host '"+urlHostName+"' is different to SSLSession host '"+session.getPeerHost()+"'.");
                }
                return true; //also accept different hostname (e.g. domain name instead of IP address)
            }
           
        };
        HttpsURLConnection.setDefaultHostnameVerifier(hv);
    }//trustHttpsCertificates