无法从命令行运行Java单元测试代码

Question

I'm a Java newbie. I want to run a Java Unit test on the command line and eventually run it from a PHP script. A snippet of my code follows

package com.src.test;

import java.io.File;
import java.io.FileWriter;
import java.util.concurrent.TimeUnit;
import org.junit.*;

import static org.junit.Assert.*;

import org.openqa.selenium.*;
import org.openqa.selenium.firefox.FirefoxDriver;
import com.thoughtworks.selenium.Selenium;

public class First {
......
}

The full path to the above file on Windows is D:\\Users\\XXX\\workspace\\SeleniumTest\\bin\\com\\src\\test

When I change directories into bin and run java com.src.test.First I get an error message:

Exception in thread "main" java.lang.NoClassDefFoundError: org/openqa/selenium/WebDriver
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
        at java.lang.Class.getMethod0(Unknown Source)
        at java.lang.Class.getMethod(Unknown Source)
        at sun.launcher.LauncherHelper.getMainMethod(Unknown Source)
        at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.openqa.selenium.WebDriver
        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)
        ... 6 more

What am I doing wrong? I've tried running java com.src.test.First.class and I get an error Error: Could not find or load main class com.src.test.First.class

Answer 1

You should compile your code using the -d option, to specify where to place the compiled files.

If you had already done that, you need to be behind .\\com . If you are not, you should run with the -cp option, showing where are your files. If you are behind .\\bin it should look like this:

java -cp .\bin com.src.test.First

Also, you should not write the .class after your class name.

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Edit :

When I say you need to be behind .\\something , I mean you should be in the directory that contains the folder "something". Also, you only need to specify extra class paths with -cp when the directory is not in the java classpath. You could always add it to the environment variable CLASSPATH . More info on this subject here

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