[byteit101]

Ok, i've narrowed it down a bit, and the crashing is due to Double.parseDouble("") throwing an exception because GetString is always returning "" (empty string)

public String GetString(String name)
    {
        Pointer ptr = Pointer.createStringBuffer(name);
        int retturn = getstringfnc.call1(ptr);
        Address adr = Address.fromPrimitive(retturn);
        String str = Pointer.NativeUnsafeGetString(adr);
        System.out.println("String:'"+str+"'");
        ptr.free();
        return str;
    }
    public double GetDouble(String name)
    {
        try
        {
            return Double.parseDouble(GetString(name));
        }
        catch(Throwable t) { }
        return 0;
    }

and

public void operatorControl() {
getWatchdog().setEnabled(false);
    while (isOperatorControl()) {

        if (z.CanSend()) {
            z.Add("taco", stick.getY());
            z.Add("val", z.GetDouble("ival"));
            z.Send();
        }
        Timer.delay(0.01);
    }
    }

produces

String:''
String:''
String:''
String:''
String:''
String:''
String:''
String:''
String:''
String:''
String:''
String:''