在执行selenium脚本时获取“java.lang.NullPointerException”

Question

好心的，谁能帮助关于以下例外的根本原因。

test_automation.tc_invoice_printing.tc_input_fields_validation(tc_invoice_printing.java:37)在java.base/jdk.internal.reflect.nativeMethodAccessorImpl.Invoke0（本机方法）在java.base/jdk.internal.reflect.nativeMethodAccessorImpl.Invoke（未知源）在java.base/jdk.internal.reflect.nativeMethodAccessorImpl.Invoke（未知源）在.suiterunner.runtest（suiterunner.java:455)在org.testng.suiterunner.runsequency（suiterunner.java:450)在org.testng.suiterunner.privaterun（suiterunner.java:415)在org.testng.suiterunner.java:364)在org.testng.suiterunner.runsuite（suiterunner.java:52)在org.testng.suiterunner.runsuite（

脚本：

@Test
public void TC_input_fields_validation() {

        int default_input_fields_count = Invoke_Test_Instance.driver.findElements(By.xpath("//input[contains(@class,'input-lg form-control')]")).size();
        System.out.println("default field count" + default_input_fields_count);
        System.out.println(Invoke_Test_Instance.driver.findElement(By.xpath("/html/body/div[1]/div/div[2]/div[2]/div/div[2]/div/form/div/div/div[2]/div/div/a")).isDisplayed());
        Invoke_Test_Instance.driver.findElement(By.xpath("/html/body/div[1]/div/div[2]/div[2]/div/div[2]/div/form/div/div/div[2]/div/div/a")).click();
        Invoke_Test_Instance.driver.findElement(By.xpath("/html/body/div[1]/div/div[2]/div[2]/div/div[2]/div/form/div/div/div[2]/div/div/a")).click();
        Invoke_Test_Instance.driver.findElement(By.xpath("/html/body/div[1]/div/div[2]/div[2]/div/div[2]/div/form/div/div/div[2]/div/div/a")).click();
}

Answer 1

通过在@BeforeClass下定义的方法中插入与web驱动程序初始化相关的方法，我的问题得到了解决