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Bad Parameters Error using 5.0.0-BETA6 and Appium 1.6.3/1.6.4-beta

See original GitHub issue

The problem

I am getting the following error when I use the 5.0.0-BETA6 java client:

[Appium] Welcome to Appium v1.6.4-beta
[Appium] Appium REST http interface listener started on 0.0.0.0:4723
[HTTP] --> POST /wd/hub/session {"desiredCapabilities":{"app":"/Users/steven.zaluk/test/Digital Banking.app","appiumVersion":"1.6.4-beta","platformVersion":"10.2","automationName":"XCUITest","takesScreenshot":true,"autoWebview":true,"platformName":"iOS","deviceName":"iPhone 6"},"requiredCapabilities":{},"capabilities":{"desiredCapabilities":{"app":"/Users/steven.zaluk/test/Digital Banking.app","appiumVersion":"1.6.4-beta","platformVersion":"10.2","automationName":"XCUITest","takesScreenshot":true,"autoWebview":true,"platformName":"iOS","deviceName":"iPhone 6"},"requiredCapabilities":{}},"alwaysMatch":{"app":"/Users/steven.zaluk/test/Digital Banking.app","appiumVersion":"1.6.4-beta","platformVersion":"10.2","automationName":"XCUITest","takesScreenshot":true,"autoWebview":true,"platformName":"iOS","deviceName":"iPhone 6"},"firstMatch":[]}
[debug] [MJSONWP] Bad parameters: BadParametersError: Parameters were incorrect. We wanted {"required":["desiredCapabilities"],"optional":["requiredCapabilities","capabilities","sessionId","id"]} and you sent ["desiredCapabilities","requiredCapabilities","capabilities","alwaysMatch","firstMatch"]
[HTTP] <-- POST /wd/hub/session 400

Environment

Appium version (or git revision) that exhibits the issue: Appium version 1.6.3 and 1.6.4-beta and 5.0.0-BETA6 of the Java client
Last Appium version that did not exhibit the issue (if applicable): Works using the 4.1.2 version of the Java Client
Desktop OS/version used to run Appium: Max OS X El Capitan (10.11.6)
Node.js version (unless using Appium.app|exe): Node v7.7.4
Mobile platform/version under test: iOS 10.2
Real device or emulator/simulator: iOS Simulator
Appium CLI or Appium.app|exe: appium

Details

I am getting a BadParametersError when using the 5.0.0-BETA6 version of the Java client but am not getting this error using the 4.1.2 version.

Link to Appium logs

https://gist.github.com/szaluk/eabe36aa5103978078c37fcf7968d7bc

Code To Reproduce Issue [ Good To Have ]

This is how I am creating my XCUITest WebDriver instance:

    private WebDriver createiOSWebDriver() throws Exception {
        DesiredCapabilities desiredCapabilities = new DesiredCapabilities();

        desiredCapabilities.setCapability(MobileCapabilityType.APPIUM_VERSION, "1.6.4-beta");
        desiredCapabilities.setCapability(MobileCapabilityType.PLATFORM_NAME, "iOS");
        desiredCapabilities.setCapability(MobileCapabilityType.PLATFORM_VERSION, "10.2");
        desiredCapabilities.setCapability(MobileCapabilityType.DEVICE_NAME, "iPhone 6");
        desiredCapabilities.setCapability(MobileCapabilityType.APP, "/path/to/app");
        desiredCapabilities.setCapability(MobileCapabilityType.AUTOMATION_NAME, "XCUITest");
        desiredCapabilities.setCapability(MobileCapabilityType.AUTO_WEBVIEW, true);
        desiredCapabilities.setCapability(CapabilityType.TAKES_SCREENSHOT, true);

        RemoteWebDriver remoteWebDriver = new RemoteWebDriver(new URL("http://url-to-appium-server"), desiredCapabilities);

        return remoteWebDriver;
    }