POMモデルのNullPointerException

Question

以下のコードでNullPointerExceptionに直面しています。これはPOMモデルで作成されたプロジェクトです。 NullPointerExceptionに関連する他の投稿を読んでいましたが、Javaコードでエラーが見つかりませんでした。 助けてください。

テストクラス：

package pl.b2b.ProjectAutomationPractice; 

import static org.junit.Assert.assertEquals; 
import org.junit.Test; 

public class AutomationPracticeTest extends Utils { 

LoginPage LoginPage = new LoginPage(); 
DefaultPage DefaultPage = new DefaultPage(); 

@Test 
public void incorrectEmailLoginPage() { 
    DefaultPage.clickButtonSignIn(); 
    LoginPage.enterEmail("xxx"); 
    LoginPage.enterPassword("xxx"); 
    assertEquals("There is 1 error\n" + "Invalid email address.", LoginPage.getWarningIncorrectLoginDetails()); 
} 

@Test 
public void incorrectPasswordLoginPage() { 
    DefaultPage.clickButtonSignIn(); 
    LoginPage.enterEmail("xxx"); 
    LoginPage.enterPassword("xxx"); 
    assertEquals("There is 1 error\n" + "Authentication failed.", LoginPage.getWarningIncorrectLoginDetails()); 
} 
} 

ページクラス：

package pl.b2b.ProjectAutomationPractice; 

import org.openqa.selenium.WebElement; 
import org.openqa.selenium.support.FindBy; 

public class LoginPage { 

@FindBy(id = "email") 
private WebElement fieldEmailLogin; 

@FindBy(id = "passwd") 
private WebElement fieldPassword; 

@FindBy(xpath = "//*[@id=\\\"SubmitLogin\\\"]/span") 
private WebElement buttonSignInAfterEnteringLoginDetails; 

@FindBy(xpath = "//*[@id=\\\"searchbox\\\"]/button") 
private WebElement buttonSearchMagnifyingGlass; 

@FindBy(xpath = "//*[@id=\\\"center_column\\\"]/p") 
private WebElement messageSuccessfulLogin; 

@FindBy(xpath = "//*[@id=\\\"center_column\\\"]/div[1]") 
private WebElement warningIncorrectLoginDetails; 



public String enterEmail(String email) { 
    this.fieldEmailLogin.sendKeys(email); 
    return email; 
} 

public String enterPassword(String password) { 
    this.fieldPassword.sendKeys(password); 
    return password; 
} 

public void clickButtonSignInAfterEnteringLoginDetails() { 
    this.buttonSignInAfterEnteringLoginDetails.click(); 
} 


public String getMessageSuccessfulLogin() { 
    return this.messageSuccessfulLogin.getText().trim(); 
} 

public String getWarningIncorrectLoginDetails() { 
    return this.warningIncorrectLoginDetails.getText().trim(); 
} 

} 

別のページクラス：

package pl.b2b.ProjectAutomationPractice; 

import org.openqa.selenium.WebElement; 
import org.openqa.selenium.support.FindBy; 

public class DefaultPage { 

@FindBy(xpath = "//*[@id=\\\"header\\\"]/div[2]/div/div/nav/div[1]/a") 
private WebElement buttonSignIn; 

public void clickButtonSignIn() { 
    this.buttonSignIn.click(); 
} 

} 

の方法：

package pl.b2b.ProjectAutomationPractice; 

import org.junit.After; 
import org.junit.Before; 
import org.openqa.selenium.WebDriver; 
import org.openqa.selenium.chrome.ChromeDriver; 

public class Utils { 

private WebDriver driver; 

@Before 
public void createBrowserInstanceNavigateToURL() { 
    System.setProperty("webdriver.chrome.driver", "C:\\chromedriver.exe"); 
    driver = new ChromeDriver(); 
    driver.get("http://automationpractice.com/index.php"); 
} 

@After 
public void close() { 
    driver.close(); 
} 
} 

エラー：DefaultPageクラスの

java.lang.NullPointerException 
at pl.b2b.ProjectAutomationPractice.DefaultPage.clickButtonSignIn(DefaultPage.java:12) 
at pl.b2b.ProjectAutomationPractice.AutomationPracticeTest.incorrectEmailLoginPage(AutomationPracticeTest.java:13) 
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 
at java.lang.reflect.Method.invoke(Method.java:498) 
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) 
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) 
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) 
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) 
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26) 
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27) 
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78) 
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57) 
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) 
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) 
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) 
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) 
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) 
at org.junit.runners.ParentRunner.run(ParentRunner.java:363) 
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) 
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:539) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:761) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:461) 
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:207) 

Answer 1

private WebElement buttonSignInは今までインスタンス化されていないようです。あなたの正規表現が失敗している可能性があります

Answer 2

私のコードを編集しようとしていました - 私はxpathで行を入力すると完全に動作します。同じXpathをDefaultPageクラスにコピーしようとすると、エラーメッセージが表示されます。理由は分かりません。

public void incorrectEmailLoginPage() { 
    driver.findElement(By.xpath("//*[@id='header']/div[2]/div/div/nav/div[1]/a")).click(); 
    DefaultPage.clickButtonSignIn(); 
    LoginPage.enterEmail("incorrectEmail@test.com"); 
    LoginPage.enterPassword("n3tw0rk2017"); 
    assertEquals("There is 1 error\n" + "Invalid email address.", LoginPage.getWarningIncorrectLoginDetails());