Drag and Drop is not working in my selenium code below, can anyone help me?
package selenium;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Bas         
        Find your own working code block with some simple tweaks in it:
//BasicConfigurator.configure();
System.setProperty("webdriver.gecko.driver", "C:\\Utility\\BrowserDrivers\\geckodriver.exe");
WebDriver driver=new FirefoxDriver();
driver.get("http://jqueryui.com/droppable/");
driver.manage().timeouts().implicitlyWait(5,TimeUnit.SECONDS);
driver.switchTo().frame(driver.findElement(By.xpath("//iframe[@class='demo-frame']")));
WebElement  from = driver.findElement(By.id("draggable"));
WebElement  to = driver.findElement(By.id("droppable"));
new Actions(driver).dragAndDrop(from, to).build().perform();
                                                                        Few things I observed in your code that
You need to first replace
WebElement  from= driver.findElementByXPath("html/body/div[1]");
with
 WebElement from = driver.findElement(By.xpath("html/body/div[1]"))
And
WebElement  to=driver.findElementByXPath("html/body/div[2]");
with
WebElement  to = driver.findElement(By.xpath("html/body/div[2]"));
You can use following code to work out:
driver.navigate().to("http://jqueryui.com/droppable/");
//Wait for the frame to be available and switch to it
WebDriverWait wait = new WebDriverWait(driver, 5);
wait.until(ExpectedConditions.frameToBeAvailableAndSwitchToIt(By.cssSelector(".demo-frame")));
WebElement Sourcelocator = driver.findElement(By.cssSelector(".ui-draggable"));
WebElement Destinationlocator = driver.findElement(By.cssSelector(".ui-droppable"));
dragAndDrop(Sourcelocator,Destinationlocator);
                                                                        Your drag and drop element present under iFrame tag. So first you need to switch into frame and then perform drag and drop.
Use below code :
System.setProperty("webdriver.chrome.driver","D:/Application/chromedriver.exe");
driver = new ChromeDriver();        
driver.manage().window().maximize();
driver.get("http://jqueryui.com/droppable/");               
driver.manage().timeouts().implicitlyWait(45, TimeUnit.SECONDS);
driver.switchTo().frame(0); // either use index or frame element
WebElement  from= driver.findElement(By.id("draggable"));
WebElement  to=driver.findElement(By.id("droppable"));
new Actions(driver).dragAndDrop(from, to).build().perform();
Please note : if element id is there then please use id selector instead of xpath
You can surely do it using below code. Just ensure that your xpath is correct or else you can't do it using any of the options.  
WebElement from = driver.findElement(By.xpath("html/body/div[1]"));
WebElement  to = driver.findElement(By.xpath("html/body/div[2]"));
Actions action1 = new Actions(driver);
action1.clickAndHold(from).moveToElement(to).release(from).build().perform();
Let me know in case of any issues but try this one it will work :)