Java版本的Selenium异常记录
1. 没有找到类的异常（NoClassDefFoundError）
异常如下：
Exception in thread "main" java.lang.NoClassDefFoundError: com/google/common/base/Function
at com.yy.baidu.testBaidu.main(testBaidu.java:12)
Caused by: java.lang.ClassNotFoundException: com.google.common.base.Function
at java.net.URLClassLoader$1.run(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more
解决办法：
此问题通常的包引入的少了，少Selenium包，如下图，除了要引入selenium-java-2.52.0.jar包以外，还需要引入libs目录下的包。
2. 没有找到Firefox的路径
异常如下：
Exception in thread "main" org.openqa.selenium.WebDriverException: Cannot find firefox binary in PATH. Make sure firefox is installed. OS appears to be: WIN8_1
Build info: version: '2.52.0', revision: '4c2593c', time: '2016-02-11 19:03:33'
System info: host: 'DESKTOP-VFHU33A', ip: '192.168.3.115', os.name: 'Windows 8.1', os.arch: 'amd64', os.version: '6.3', java.version: '1.7.0_79'
Driver info: driver.version: FirefoxDriver
at org.openqa.selenium.firefox.internal.Executable.<init>(Executable.java:74)
at org.openqa.selenium.firefox.FirefoxBinary.<init>(FirefoxBinary.java:60)
at org.openqa.selenium.firefox.FirefoxBinary.<init>(FirefoxBinary.java:56)
at org.openqa.selenium.firefox.FirefoxDriver.<init>(FirefoxDriver.java:120)
at com.yy.baidu.testBaidu.main(testBaidu.java:12)
解决办法：
方法1. 重装Firefox，这个问题最简单的办法就是重新按照Firefox，稳稳的
方法2. 用System.setPropert方法设置webdriver.firefox.bin的值，如：
public class testBaidu {
public static void main(String[] args){
System.setProperty("webdriver.firefox.bin","D:\\Mozilla Firefox\\firefox.exe");
System.out.println("srart selenium ");
WebDriver driver = new FirefoxDriver();
driver.get("http://www.baidu.com");
WebElement txtbox = driver.findElement(By.id("kw"));
txtbox.sendKeys("selenium java");
WebElement btn = driver.findElement(By.id("su"));
btn.click();
System.out.println("end selenium");
}
}
方法3. 用FirefoxBinary类和public FirefoxDriver(FirefoxBinary binary, FirefoxProfile profile)这个构造方法，直接上代码:
public class testBaidu {
public static void main(String[] args){
File pathToFirefoxBinary = new File("D:\\Mozilla Firefox\\firefox.exe");
FirefoxBinary firefoxbin = new FirefoxBinary(pathToFirefoxBinary);
WebDriver driver = new FirefoxDriver(firefoxbin,null);
System.out.println("srart selenium ");
WebDriver driver = new FirefoxDriver();
driver.get("http://www.baidu.com");
WebElement txtbox = driver.findElement(By.id("kw"));
txtbox.sendKeys("selenium java");
WebElement btn = driver.findElement(By.id("su"));
btn.click();
System.out.println("end selenium");
}
}
注：有人可能会不知道webdriver.firefox.bin，可以看一下源码，其中
org.openqa.selenium.firefox.internal.Executable.locateFirefoxBinaryFromSystemProperty()
方法第一句
String binaryName = System.getProperty(FirefoxDriver.SystemProperty.BROWSER_BINARY);
说明默认的时候取的就是这个值，重新设置一下。
最后附上查看Selenium源码的方法
1. 右键selenium引入的jar包“selenium-java-2.52.0.jar”选择Properties
2. 点击External location -> External File... -> 找到“selenium-java-2.52.0-srcs.jar”
设置好了之后，就可以查看Selenium的源码了。
