PhoneGap getJSON to call REST Service not working

I am creating a PhoneGap application that should call some REST web service methods to get some data and to send some data to the server. Somewhere in my program I have got the following code: ``` $.getJSON("https://mgeowiki4.iwvi.uni-koblenz.de/API/UniKoblenz/validateCredentials/SampleUser/Password", function(data){ echo("data: " + data); }) .success(function() { alert("second success"); }) .error(function() { alert("error"); }) .complete(function() { alert("complete"); }); ``` Unfortunately when I execute this nothing happens. I am using Eclipse with the android emulator to test this. None of the alert messages are displayed. Even the error message is not displayed. If I call the service in browser I get the following if the password was not correct: ``` {"passwordIsValid": "false"} ``` and the following if the password is correct: ``` {"passwordIsValid": "true"} ``` How can I get those results in my PhoneGap application? I kind of have no clue what to do :-(