Facing NullPointerException in Selenium - selenium

Question

I have created three files: one is index file, other is configuration file and last the last one is the property file. While executing the code I'm getting NULLPointerException.
I am not able to solve this issue. Please help me to rectify this code.
index.java:
package main;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.chrome.ChromeDriver;
import org.testng.annotations.Test;
import config.Configuration;
public class Index
{
WebDriver driver;
#Test(priority = 1)
public void handling_multiple_windows() throws Exception
{
Configuration obj = new Configuration();
System.setProperty("webdriver.chrome.driver", obj.path());
driver = new ChromeDriver();
driver.manage().window().maximize();
driver.get(obj.handling_window_url());
}
}
Configuration.java:
package config;
import java.io.File;
import java.io.FileInputStream;
import java.util.Properties;
import org.openqa.selenium.WebDriver;
public class Configuration
{
Properties pro;
WebDriver driver;
public Configuration() throws Exception
{
File f = new File("./Config/config.property");
FileInputStream fis = new FileInputStream(f);
Properties pro = new Properties();
pro.load(fis);
}
public String path()
{
String url = pro.getProperty("ChromeDriverPath");
return url;
}
public String handling_window_url()
{
return pro.getProperty("URL");
}
}
config.property:
ChromeDriverPath = G:\\Selenium Webdriver\\chromedriver\\chromedriver.exe
URL = https://www.naukri.com

Answer 1

The reason you get a NullPointerException is because in the Configuration.java Class you have declared Properties pro; globally but again within the Configuration() constructor you have again initiated another instance of Properties as Properties pro = new Properties();. Hence the NullPointerException.
Change the line:
Properties pro = new Properties();
to:
pro = new Properties();
Your code will work fine.

Answer 2

Remove Properties from Properties pro = new Properties(); from this code and make it:
pro = new Properties();
You already declare it above, so need to declare it again