Null Pointer Exception when trying to take a screenshot with selenium [duplicate]

Answer 1

You are making a new reference for WebDriver in your Screenshot class. This WebDriver is never instantiated, thus will give you a NullPointerException. Instead you should pass the WebDriver instance as a parameter to the method.

public class Screenshot {

File source;

public void takeScreenshot(WebDriver webDriver) {

    try {
        source = ((TakesScreenshot) webDriver).getScreenshotAs(OutputType.FILE);


    FileUtils.copyFile(source, new File ("/Users/joshuadunn/Desktop/claimsScreenShot.png"));
    System.out.println("Screenshot Taken!!!!");

    } catch (IOException e) {
        e.printStackTrace();
    } 
}

}

And the test case:

@Test
public void testClaimsTestToCalcNode() throws Exception {
    driver.get(baseUrl + "/");
    driver.findElement(By.id("becsStartCalculator")).click();
    driver.findElement(By.id("MARITAL_STATUS_false")).click();
    driver.findElement(By.id("btn_next")).click();
    driver.findElement(By.id("HOME_ABROAD_false")).click();

    *** This is where the null pointer is ***
    *******************************
    screenshot.takeScreenshot(driver);
    *******************************


    driver.findElement(By.id("btn_next")).click();
    driver.findElement(By.id("DETAILS_STUDENT_YOU_false")).click();

Edit: Alternatively you could set the WebDriver in the constructor of Screenshot

public void Screenshot(WebDriver webDriver){
    this.webDriver = webDriver;
}