Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certific

应用程序客户端访问https服务时报错。直接给出解决方案：

package http;


import java.net.MalformedURLException;
import java.net.URL;


public class HttpClientTest3 {
public static void main(String[] args) throws MalformedURLException {
AbstractCasProtocolUrlBasedTicketValidator validator = new AbstractCasProtocolUrlBasedTicketValidator();
String url = "https://localhost:8443/tms/service/domain/getDomains.action?domainID=1000_1456217771733";
URL hahaUrl = new URL(url);
String content = validator.retrieveResponseFromServer(hahaUrl, null);
System.out.println(content);
}
}

package http;


import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;


import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLSession;




/**
 * Abstract class that knows the protocol for validating a CAS ticket.
 * 
 * @author Scott Battaglia
 * @version $Revision$ $Date$
 * @since 3.1
 */
public class AbstractCasProtocolUrlBasedTicketValidator {


protected AbstractCasProtocolUrlBasedTicketValidator() {

}


HostnameVerifier hv = new HostnameVerifier() {
        public boolean verify(String urlHostName, SSLSession session) {
            System.out.println("Warning: URL Host: " + urlHostName + " vs. "
                               + session.getPeerHost());
            return true;
        }
    };

/**
* Retrieves the response from the server by opening a connection and merely
* reading the response.
*/
protected final String retrieveResponseFromServer(final URL validationUrl,
final String ticket) {
HttpURLConnection connection = null;

//System.out.println("============================================================");


try {
trustAllHttpsCertificates();
HttpsURLConnection.setDefaultHostnameVerifier(hv);


connection = (HttpURLConnection) validationUrl.openConnection();
final BufferedReader in = new BufferedReader(new InputStreamReader(
connection.getInputStream()));


String line;
final StringBuffer stringBuffer = new StringBuffer(255);


synchronized (stringBuffer) {
while ((line = in.readLine()) != null) {
stringBuffer.append(line);
stringBuffer.append("\n");
}
return stringBuffer.toString();
}


} catch (final IOException e) {
return null;
} catch (final Exception e1){
return null;
}finally {
if (connection != null) {
connection.disconnect();
}
}
}

private static void trustAllHttpsCertificates() throws Exception {
javax.net.ssl.TrustManager[] trustAllCerts = new javax.net.ssl.TrustManager[1];
javax.net.ssl.TrustManager tm = new miTM();
trustAllCerts[0] = tm;
javax.net.ssl.SSLContext sc = javax.net.ssl.SSLContext
.getInstance("SSL");
sc.init(null, trustAllCerts, null);
javax.net.ssl.HttpsURLConnection.setDefaultSSLSocketFactory(sc
.getSocketFactory());
}


static class miTM implements javax.net.ssl.TrustManager,
javax.net.ssl.X509TrustManager {
public java.security.cert.X509Certificate[] getAcceptedIssuers() {
return null;
}


public boolean isServerTrusted(
java.security.cert.X509Certificate[] certs) {
return true;
}


public boolean isClientTrusted(
java.security.cert.X509Certificate[] certs) {
return true;
}


public void checkServerTrusted(
java.security.cert.X509Certificate[] certs, String authType)
throws java.security.cert.CertificateException {
return;
}


public void checkClientTrusted(
java.security.cert.X509Certificate[] certs, String authType)
throws java.security.cert.CertificateException {
return;
}
}


}