AJAX / JS Remoting Testing

AJAXRemoteController.java

global class AJAXRemoteController {

    webService static String getContextUserName() {
        return UserInfo.getFirstName();
   }

    
    webService static List<Contact> getAllMyContactsWS() {
        List<Contact> contacts = [SELECT ID, FirstName, LastName, Phone, MobilePhone, AssistantPhone from Contact];
        return contacts;
    }
    
    @RemoteAction
    static public List<Contact> getAllMyContacts() {
        List<Contact> contacts = [SELECT ID, FirstName, LastName, Phone, MobilePhone, AssistantPhone from Contact];
        return contacts;
    }   
    
    @RemoteAction
    static public List<BlueCategory> getClassExample() {
        List<BlueCategory> bc = new List<BlueCategory>();
        BlueCategory b = new BlueCategory('Test');
        bc.add(b);
        return bc;
    }
    
    
    
}

AJAXRemoteController.jsp

<apex:page showHeader="false" controller="AJAXRemoteController" >
    
<script type="text/javascript">
var __sfdcSessionId = '{!GETSESSIONID()}';
</script>
    <script src="/soap/ajax/21.0/connection.js"></script>
    <script src="/soap/ajax/21.0/apex.js"></script>
    <script>
    function getAJAX() {
        var contacts = sforce.connection.query('SELECT ID, FirstName, LastName, Phone, MobilePhone, AssistantPhone from Contact');
        console.log(contacts.records.length);
    }
        
    function getJSRemoting() {
            AJAXRemoteController.getAllMyContacts(function (results, message) { 
                console.log(results.length);
            });
    }
        
    function getAJAXWS() {
        var contacts = sforce.apex.execute("AJAXRemoteController", "getAllMyContactsWS", {});
        console.log(contacts.length);
    }
       
        
    function getJSRemotingClass() {
            AJAXRemoteController.getClassExample(function (results, message) { 
                console.log(results[0]);
            });
    }    
    </script>
    
    
    
    <div>
        <button onclick="getAJAX()">Get Contacts (AJAX Toolkit)</button> | 
        <button onclick="getJSRemoting()">Get Contacts (JS Remoting)</button> |
        <button onclick="getAJAXWS()">Get Contacts (AJAX w/ WS)</button> |
        <button onclick="getJSRemotingClass()">Get Class (JS Remoting)</button> 
    </div>
    
</apex:page>