java - How to feed appium with right parameters? -

i'm trying connect android emulator following capabilities:

public class simpleandroidcalctest {   webdriver driver;   @before public void setup() throws malformedurlexception {      desiredcapabilities capabilities = new desiredcapabilities();      capabilities.setcapability("platformname", "android");      capabilities.setcapability("platformversion", "7.1.1");      capabilities.setcapability("devicename", "android-7");      capabilities.setcapability("apppackage", "com.android.calculator2");      capabilities.setcapability("appactivity", "com.android.calculator2.calculator");      driver = new remotewebdriver(new url("http://127.0.0.1:4723/wd/hub"), capabilities);     driver.manage().timeouts().implicitlywait(15, timeunit.seconds);  } 

and keep getting following bad parameters error:

[http] --> post /wd/hub/session {"desiredcapabilities":{"apppackage":"com.android.calculator2","appactivity":"com.android.calculator2.calculator","platformversion":"7.1.1","platformname":"android","devicename":"android-7"},"requiredcapabilities":{},"capabilities":{"desiredcapabilities":{"apppackage":"com.android.calculator2","appactivity":"com.android.calculator2.calculator","platformversion":"7.1.1","platformname":"android","devicename":"android-7"},"requiredcapabilities":{}},"alwaysmatch":{"apppackage":"com.android.calculator2","appactivity":"com.android.calculator2.calculator","platformversion":"7.1.1","platformname":"android","devicename":"android-7"},"firstmatch":[]} [mjsonwp] bad parameters: badparameterserror: parameters incorrect. wanted {"required":["desiredcapabilities"],"optional":["requiredcapabilities","capabilities","sessionid","id"]} , sent ["desiredcapabilities","requiredcapabilities","capabilities","alwaysmatch","firstmatch"] [http] <-- post /wd/hub/session 400 4 ms - 243 

i've checked many times input capabilities, seem valid, far can tell, or should use else?

appium server: v1.6.4 selenium-java: v3.3.1

this error happens because using selenium-java : v3.3.1 without correct appium java client

please refer : https://github.com/appium/java-client

only latest appium java client 5.0.0-beta7 possible use selenium-java : v3.3.1.

or can revert selenium-java 2.53.1