selenium - 执行功能文件时显示错误“空指针异常”

Question

我已经为同一个文件编写了一个功能文件和一个单独的步骤定义文件。这里的主要工作是我想验证“注册”页面的元素。

但是当我执行功能文件时，“空指针异常”错误可以在这里看到“。

我的功能文件是

Feature: Verify the Register page

            @TC2
            Scenario: Verify the Register link provided on Home Page

               Given user is on  HomePage
               When user clicks on register link
               Then user should be able to view  <fields> such as

               |fields|
               |First Name|
               |Last Name|
               |Address|
               |City|
               |State|
               |Zip code|
               |Phone|
               |SSN|
               |Username|
               |Password|
               |Confirm| 

我的 Test Runner 课程是：

            package runner;

            import org.junit.runner.RunWith;

            import cucumber.api.CucumberOptions;
            import cucumber.api.junit.Cucumber;

            @RunWith(Cucumber.class)
            @CucumberOptions(
            features="D:\\Para_Bank_Cucumber\\Cucumber_Framework\\src\\main\\java\\ParaBank\\Cucumber_Framework\\Para_bank_TC_01.feature"
            , glue= {"StepFiles"}
            , dryRun= false
            ,monochrome=true
            , strict=true
            ,tags= {"@TC2"}
            )


            public class Test_runner {

            }

我的步骤定义文件（代码）如下：

            package StepFiles;

            import java.util.List;
            import org.openqa.selenium.By;
            import org.openqa.selenium.JavascriptExecutor;
            import org.openqa.selenium.WebDriver;
            import org.openqa.selenium.WebElement;
            import org.openqa.selenium.support.FindBy;
            import org.openqa.selenium.support.ui.ExpectedConditions;
            import org.openqa.selenium.support.ui.WebDriverWait;

            import DataProvider.ConfigFileReader;
            import cucumber.api.DataTable;
            import cucumber.api.java.en.Then;
            import cucumber.api.java.en.When;



            public class ParaBank_TC_02_Step {

                public  WebDriver driver;
                ConfigFileReader configFileReader;



                @FindBy(xpath="//a[contains(text(),'Register')]")
                private WebElement register_link;

                  @When ("^user clicks on register link$")
                    public void click_register() throws InterruptedException
                    {
                         WebDriverWait wait=new WebDriverWait(driver,30);
                         wait.until(ExpectedConditions.visibilityOf(register_link));
                         //wait.until(ExpectedConditions.presenceOfElementLocated(By.xpath("//a[contains(text(),'Register')]")));
                         register_link.click();
                    }


                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.firstName']")
                    private WebElement first_name;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.lastName']")
                    private WebElement last_name;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.address.street']")
                    private WebElement Address;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.address.city']")
                    private WebElement city;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.address.state']")
                    private WebElement state;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.address.zipCode']")
                    private WebElement zip;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.phoneNumber']")
                    private WebElement phone;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.ssn']")
                    private WebElement SSN;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.username']")
                    private WebElement Username;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='customer.password']")
                    private WebElement password;

                    @FindBy(xpath="//table[@class='form2']/tbody/tr/td[2]/input[@id='repeatedPassword']")
                    private WebElement repeat_pass;

                    @Then ("^user should be able to view  <fields> such as$")
                    public void verify_fields(DataTable testData)
                    {
                        List<String> all_fields=testData.asList(String.class);  

                        for(String fields_links:all_fields)
                        {

                            WebDriverWait wait =new WebDriverWait(driver,30);
                            wait.until(ExpectedConditions.visibilityOf(first_name));
                            JavascriptExecutor js=(JavascriptExecutor)driver;
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", first_name);             

                            wait.until(ExpectedConditions.visibilityOf(last_name));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", last_name);          


                            wait.until(ExpectedConditions.visibilityOf(Address));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", Address);

                            wait.until(ExpectedConditions.visibilityOf(city));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", city);

                            wait.until(ExpectedConditions.visibilityOf(state));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", state);

                            wait.until(ExpectedConditions.visibilityOf(zip));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", zip);

                            wait.until(ExpectedConditions.visibilityOf(phone));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", phone);

                            wait.until(ExpectedConditions.visibilityOf(SSN));           
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", SSN);


                            wait.until(ExpectedConditions.visibilityOf(phone));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", phone);


                            wait.until(ExpectedConditions.visibilityOf(Username));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", Username);

                            wait.until(ExpectedConditions.visibilityOf(password));
                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", password);


                            wait.until(ExpectedConditions.visibilityOf(repeat_pass));

                            js.executeScript("arguments[0].setAttribute('style', 'color: blue; border: 2px solid Magenta;');", repeat_pass);



                        }
                    }

            }

预期结果 ：-

        1. it should click on Register link.
        2. It should highlight the elements described in javascript executor.

实际结果 ：-

NullPointerException error could be seen on a page.

请帮助我找到此错误的根本原因。找不到此错误的根本原因。我试过把 wait ie Web driver wait ，但无法解决错误。
为了进一步清晰，我还发布了我的 Test runner 课程。

请帮我解决这个错误。了解 NullPointerException 错误的存在需要帮助。

我是否应该增加 webdriver 的等待时间，以便它可以先跟踪元素然后执行所需的操作。

或者 javaScriptExecutor 中存在错误。

标签： seleniumcucumberbdd