Hi there,
Pls try the below approach : It worked for me.
WebDriver driver = DriverFactory.getWebDriver();
WebElement LocatorFrom = driver.findElement(By.xpath("//drag")); // draggable
WebElement LocatorTo = driver.findElement(By.xpath("//drop")); // droppable
String xto=Integer.toString(LocatorTo.getLocation().x);
String yto=Integer.toString(LocatorTo.getLocation().y);
((JavascriptExecutor)driver).executeScript('function simulate(f,c,d,e){var b,a=null;for(b in eventMatchers)if(eventMatchers[b].test(c)){a=b;break}if(!a)return!1;document.createEvent?(b=document.createEvent(a),a==\'HTMLEvents\'?b.initEvent(c,!0,!0):b.initMouseEvent(c,!0,!0,document.defaultView,0,d,e,d,e,!1,!1,!1,!1,0,null),f.dispatchEvent(b)):(a=document.createEventObject(),a.detail=0,a.screenX=d,a.screenY=e,a.clientX=d,a.clientY=e,a.ctrlKey=!1,a.altKey=!1,a.shiftKey=!1,a.metaKey=!1,a.button=1,f.fireEvent(\'on\'+c,a));return!0} var eventMatchers={HTMLEvents:/^(?:load|unload|abort|error|select|change|submit|reset|focus|blur|resize|scroll)$/,MouseEvents:/^(?:click|dblclick|mouse(?:down|up|over|move|out))$/}; ' +
'simulate(arguments[0],\'mousedown\',0,0); simulate(arguments[0],\'mousemove\',arguments[1],arguments[2]); simulate(arguments[0],\'mouseup\',arguments[1],arguments[2]); ', LocatorFrom,xto,yto);