Question

我有一个使用POM模型的框架，我使用了Utils文件夹结构，该文件夹结构包含配置和打开浏览器的DriverFactory，Constant和ReadConfigFile java文件。（以下代码）

在我这样做之前（介绍了Utils包），代码运行正常，在介绍了Utils包后，我得到了＃34;无法加载browsernull＆＃34;例外。

不确定导致问题的原因。我正在使用Mac机。

Constant.java 文件：

    package Utils;

    public class Constant {

    public final static String CONFIG_PROPERTIES_DIRECTORY = "properties/config.properties";

    public final static String GECKO_DRIVER_DIRECTORY = System.getProperty("user.dir")+"CucumberFramework/src/test/java/Resources/geckodriver";

    public final static String CHROME_DRIVER_DIRECTORY = System.getProperty("user.dir")+"CucumberFramework/src/test/java/Resources/chromedriver";


    }

DriverFactory.java 文件：

    package Utils;

    //import com.sun.java.util.jar.pack.Instruction;
    import com.sun.tools.javac.code.Attribute;
    import org.openqa.selenium.WebDriver;
    import org.openqa.selenium.chrome.ChromeDriver;
    import org.openqa.selenium.firefox.FirefoxDriver;
    import org.openqa.selenium.remote.DesiredCapabilities;
    import org.openqa.selenium.support.PageFactory;
    import pageObjects.AddIssuePage;
    import pageObjects.Login_Page;

    import java.util.concurrent.TimeUnit;

    public class DriverFactory {

        public static WebDriver driver;
        public static Login_Page login_page;
        public static AddIssuePage addIssuePage;


        public WebDriver getDriver() {        

            try        
            {        
                ReadConfigFile file = new ReadConfigFile();
                String browserName = file.getBrowser();
                switch (browserName) {

                    case "firefox":

                        if (null == driver) {
                            System.setProperty("webdriver.geckodriver", Constant.GECKO_DRIVER_DIRECTORY);
                            DesiredCapabilities capabilities = DesiredCapabilities.firefox();
                            capabilities.setCapability("marionette", true);
                            driver = new FirefoxDriver();

                        }
                        break;

                    case "chrome":

                        if (null == driver) {

                            System.setProperty("webdriver.chromedriver", Constant.CHROME_DRIVER_DIRECTORY);
                            driver = new ChromeDriver();

                        }
                        break;

                }
            } catch (Exception e)

            {
                System.out.println("Unable to load browser" + e.getMessage());

            } finally        
            {
                driver.manage().timeouts().pageLoadTimeout(60, TimeUnit.SECONDS);
                login_page = PageFactory.initElements(driver, Login_Page.class);
            }

            return driver;
        }
    }

ReadConfigFile.java 文件：

package Utils;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class ReadConfigFile {

    protected InputStream input = null;
    protected Properties prop = null;

    public ReadConfigFile () {

        try {
            ReadConfigFile.class.getClassLoader ().getResourceAsStream (Constant.CONFIG_PROPERTIES_DIRECTORY);
            prop = new Properties();
            prop.load(input);

        } catch (IOException e) {
            e.printStackTrace(); 
        }
    }

    public String getBrowser(){

        if (prop.getProperty("browser") == null)    
            return " ";

        return prop.getProperty("browser");

    }

}

堆栈跟踪：

java.lang.NullPointerException
    at Utils.DriverFactory.getDriver(DriverFactory.java:63)
    at Steps.MasterHooks.setup(MasterHooks.java:11)
    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 cucumber.runtime.Utils$1.call(Utils.java:40)
    at cucumber.runtime.Timeout.timeout(Timeout.java:16)
    at cucumber.runtime.Utils.invoke(Utils.java:34)
    at cucumber.runtime.java.JavaHookDefinition.execute(JavaHookDefinition.java:60)
    at cucumber.runtime.Runtime.runHookIfTagsMatch(Runtime.java:224)
    at cucumber.runtime.Runtime.runHooks(Runtime.java:212)
    at cucumber.runtime.Runtime.runBeforeHooks(Runtime.java:202)
    at cucumber.runtime.model.CucumberScenario.run(CucumberScenario.java:40)
    at cucumber.runtime.model.CucumberScenarioOutline.run(CucumberScenarioOutline.java:46)
    at cucumber.runtime.model.CucumberFeature.run(CucumberFeature.java:165)
    at cucumber.runtime.Runtime.run(Runtime.java:122)
    at cucumber.api.cli.Main.run(Main.java:36)
    at cucumber.api.cli.Main.main(Main.java:18)

java.lang.NullPointerException
    at Utils.DriverFactory.getDriver(DriverFactory.java:63)
    at Steps.MasterHooks.setup(MasterHooks.java:11)
    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 cucumber.runtime.Utils$1.call(Utils.java:40)
    at cucumber.runtime.Timeout.timeout(Timeout.java:16)
    at cucumber.runtime.Utils.invoke(Utils.java:34)
    at cucumber.runtime.java.JavaHookDefinition.execute(JavaHookDefinition.java:60)
    at cucumber.runtime.Runtime.runHookIfTagsMatch(Runtime.java:224)
    at cucumber.runtime.Runtime.runHooks(Runtime.java:212)
    at cucumber.runtime.Runtime.runBeforeHooks(Runtime.java:202)
    at cucumber.runtime.model.CucumberScenario.run(CucumberScenario.java:40)
    at cucumber.runtime.model.CucumberScenarioOutline.run(CucumberScenarioOutline.java:46)
    at cucumber.runtime.model.CucumberFeature.run(CucumberFeature.java:165)
    at cucumber.runtime.Runtime.run(Runtime.java:122)
    at cucumber.api.cli.Main.run(Main.java:36)
    at cucumber.api.cli.Main.main(Main.java:18)


Process finished with exit code 1

MasterHooks

package Steps;

import Utils.DriverFactory;
import cucumber.api.java.After;
import cucumber.api.java.Before;

public class MasterHooks extends DriverFactory {

    @Before
    public void setup() {
        driver = getDriver();

    }

    @After
    public void tearDown() {

        if (driver != null) {
            driver.quit();
        }
    }
}

Answer 1

这里的问题是，在Read config file class中，Input Stream类型的输入实例变量被赋值为null。应将其分配给输入流，如下所示。

package Utils;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

public class ReadConfigFile {

    protected InputStream input = null;
    protected Properties prop = null;

    public ReadConfigFile () {

        try {
            input = ReadConfigFile.class.getClassLoader ().getResourceAsStream (Constant.CONFIG_PROPERTIES_DIRECTORY);
            prop = new Properties();
            prop.load(input);

        } catch (IOException e) {
            e.printStackTrace(); 
        }
    }

    public String getBrowser(){

        if (prop.getProperty("browser") == null)    
            return " ";

        return prop.getProperty("browser");

    }

}

Answer 2

此错误消息......

Unable to load browsernull

...意味着函数getBrowser()正在返回 null 。

我会建议改变：

在 ReadConfigFile.java ：

中

变化：

ReadConfigFile.class.getClassLoader ().getResourceAsStream (Constant.CONFIG_PROPERTIES_DIRECTORY);

要：

File src = new File(Constant.CONFIG_PROPERTIES_DIRECTORY);
FileInputStream fis = new FileInputStream(src);
Properties prop = new Properties();
prop.load(fis);

变化：

public String getBrowser(){

    if (prop.getProperty("browser") == null)    
        return " ";

    return prop.getProperty("browser");

}

要：

public String getBrowser(){

    return prop.getProperty("browser");
}

在 Constant.java

中

变化：

public final static String CONFIG_PROPERTIES_DIRECTORY = "properties/config.properties";

要：

public final static String CONFIG_PROPERTIES_DIRECTORY = "./src/main/java/properties/config.properties";

在 DriverFactory.java

中

变化：
```
"webdriver.geckodriver"
```
要：
```
"webdriver.gecko.driver"
```
变化：
```
"webdriver.chromedriver"
```
要：
```
"webdriver.chrome.driver"
```

Answer 3

你能分享你的properties / config.properties文件吗？

在你分享的信息中，我正在思考：

当你在DriverFactory中调用

时

            ReadConfigFile file = new ReadConfigFile();
            String browserName = file.getBrowser();

在getBrowser（）中有：

   public String getBrowser(){

    if (prop.getProperty("browser") == null)    
        return " ";

    return prop.getProperty("browser");

}

因此，如果prop.getProperty("browser")为空，则您将在browserName中返回" "。

在开关中：

switch (browserName) {

                    case "firefox":

                        if (null == driver) {
                            System.setProperty("webdriver.geckodriver", Constant.GECKO_DRIVER_DIRECTORY);
                            DesiredCapabilities capabilities = DesiredCapabilities.firefox();
                            capabilities.setCapability("marionette", true);
                            driver = new FirefoxDriver();

                        }
                        break;

                    case "chrome":

                        if (null == driver) {

                            System.setProperty("webdriver.chromedriver", Constant.CHROME_DRIVER_DIRECTORY);
                            driver = new ChromeDriver();

                        }
                        break;

                }
            } catch (Exception e)

            {
                System.out.println("Unable to load browser" + e.getMessage());

            } finally        
            {
                driver.manage().timeouts().pageLoadTimeout(60, TimeUnit.SECONDS);
                login_page = PageFactory.initElements(driver, Login_Page.class);
            }

我没有看到任何检查案例browserName是" " ，或者在另一种情况下（我的意思是，没有＆＃39; ta 默认情况下）< / strong>即可。因此，如果browserName是＆＃34; ＆＃34;或其他不同的＆＃34; firefox＆＃34;或＆＃34; chrome＆＃34;你直接进入finally语句（最后总是执行）。在这种情况下，由于未实例化驱动程序，因此在

中将出现nullpointer异常
driver.manage().timeouts().pageLoadTimeout(60, TimeUnit.SECONDS);

无法在selenium中打开浏览器，抛出＆＃34; null＆＃34;信息

3 个答案: