Page Objects erro (java.lang.NullPointerException) - selenium-webdriver

Question

I did a basic project to training about Page Objects using selenium WebDriver with java and Junit. So, I make a page object class and Junit class too. I Make a call of method and pass the parameters to method but, the eclipse show a message that say: java.lang.NullPointerException
public class LogarBkoMaisPage {
static WebDriver driver;
By campoNome = By.id("matricula_I");
By campoSenha = By.id("senha_I");
By btnLogin = By.id("bt_entrar");
public LogarBkoMaisPage(WebDriver driver) {
this.driver = driver;
}
public void logar(String usuario, String senha) {
driver.findElement(campoNome).sendKeys(usuario);
driver.findElement(campoSenha).sendKeys(senha);
driver.findElement(btnLogin).click();
}
}
public class LogarBkoMaisTest {
static WebDriver driver;
#Before
public void setUp() throws Exception {
SelecionarNavegador nav = new SelecionarNavegador();
nav.iniciarNavegador("ie","http://10.5.9.45/BkoMais_Selenium/");
}
#Test
public void logarAplicacao() {
try {
LogarBkoMaisPage login = new LogarBkoMaisPage(driver);
login.logar("844502","Bcc201707");
}catch(Exception e) {
System.out.println("Mensagem de erro: " +e);
}
}
#After
public void tearDown() throws Exception {
}
}
public class SelecionarNavegador {
static WebDriver driver;
public static WebDriver iniciarNavegador(String nomeNavegador, String url) {
if(nomeNavegador.equalsIgnoreCase("firefox")) {
System.setProperty("webdriver.gecko.driver", "E:\\workspace_BCC_QA_BKOMAIS\\"
+ "FireFoxGeckodriver64\\geckodriver.exe");
driver = new FirefoxDriver();
}
else if(nomeNavegador.equalsIgnoreCase("chrome")){
System.setProperty("webdriver.chrome.driver", "E:\\workspace_BCC_QA_BKOMAIS"
+ "\\chromedriver_win32\\chromedriver.exe");
driver = new ChromeDriver();
}else if(nomeNavegador.equalsIgnoreCase("IE")) {
System.setProperty("webdriver.ie.driver", "E:\\workspace_BCC_QA_BKOMAIS"
+ "\\IE Plugin\\IEDriverServer.exe");
driver = new InternetExplorerDriver();
}
driver.manage().window().maximize();
driver.get(url);
return driver;
}
}
Exception:

Answer 1

You are getting a null pointer exception because iniciarNavegador method inside SelecionarNavegador class is the one which initializes the driver and it returns the driver which has to be assigned to a vairable. You need to do this in your setUp()method
#Before
public void setUp() throws Exception {
SelecionarNavegador nav = new SelecionarNavegador();
driver=nav.iniciarNavegador("ie","http://10.5.9.45/BkoMais_Selenium/");
}