android mqtt ssl connection not working in android 7 -


i working on mqtt ssl connection using paho(https://github.com/eclipse/paho.mqtt.android). connection not working in android nougat , working bellow android 7.

i getting following exception:

mqttjavax.net.ssl.sslhandshakeexception: java.security.cert.certpathvalidatorexception: trust anchor certification path not found.

i using bellow code connect mqtt. 

final mqttandroidclient mqttandroidclient = new mqttandroidclient(mainactivity.this, "ssl://" + pref.getmqtturl(), clientid, persistence);      try {          string clientid = mqttclient.generateclientid();           mqttconnectoptions connectionoptions = new mqttconnectoptions();          connectionoptions.setcleansession(true);          log.e("test", "ssl://" + pref.getmqtturl());          try {             inputstream truststoresis = context.getresources().openrawresource(r.raw.ca_key);               string truststoretype = keystore.getdefaulttype();             keystore truststore = keystore.getinstance(truststoretype);             truststore.load(truststoresis, context.getstring(r.string.bks_password).tochararray());              string tmfalgorithm = trustmanagerfactory.getdefaultalgorithm();             trustmanagerfactory tmf = trustmanagerfactory.getinstance(tmfalgorithm);             tmf.init(truststore);              inputstream keystorestream = context.getresources().openrawresource(r.raw.user_cer_key);             keystore keystore = null;             keystore = keystore.getinstance("bks");             keystore.load(keystorestream, context.getstring(r.string.bks_password).tochararray());              keymanagerfactory keymanagerfactory = null;             keymanagerfactory = keymanagerfactory.getinstance(keymanagerfactory.getdefaultalgorithm());             keymanagerfactory.init(keystore, context.getstring(r.string.bks_password).tochararray());              sslcontext context = sslcontext.getinstance("ssl");             context.init(keymanagerfactory.getkeymanagers(), tmf.gettrustmanagers(), null);              sslsocketfactory sslsocketfactory = (sslsocketfactory) context.getsocketfactory();             connectionoptions.setsocketfactory(sslsocketfactory);          } catch (keymanagementexception | certificateexception | keystoreexception | ioexception | nosuchalgorithmexception | unrecoverablekeyexception e) {             // todo auto-generated catch block             e.printstacktrace();         }          mqttandroidclient.connect(connectionoptions, null, new imqttactionlistener() {             @override             public void onsuccess(imqtttoken asyncactiontoken) {                 log.e("mqtt","connection success!");              }              @override             public void onfailure(imqtttoken asyncactiontoken, throwable exception) {                 log.e("mqtt","connection failure!");              }         });          mqttandroidclient.setcallback(new mqttcallback() {             @override             public void connectionlost(throwable cause) {                 log.e("mqtt","connection lost!");              }              @override             public void messagearrived(string topic, mqttmessage message) throws exception {                }              @override             public void deliverycomplete(imqttdeliverytoken token) {                 system.out.println("mqtt delivery complete!");             }          });       } catch (exception ex) {         ex.printstacktrace();      }


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