学习testNG之报错-A JNI error has occurred

安装完testNG后，创建第一个程序hello，导入testng的jar包，新建hello类，如下：

> package com.shanghai.test;
> 
> public class Hello {
> 
>   public String mail() {      return "32423@qq.com";  } }

新建testng类TestHello测试hello类，代码如下

package com.shanghai.test;

import org.testng.Assert;
import org.testng.annotations.Test;

public class TestHello {
  @Test
  public void f() {
      Hello he = new Hello();
      String aa = he.mail();
      Assert.assertNotNull(aa);
      Assert.assertEquals(aa, "32423@qq.com");
  }
}

执行testng程序，报如下错误：

Exception in thread "main" java.lang.NoClassDefFoundError: com/beust/jcommander/ParameterException
    at java.lang.Class.getDeclaredMethods0(Native Method)
    at java.lang.Class.privateGetDeclaredMethods(Unknown Source)
    at java.lang.Class.privateGetMethodRecursive(Unknown Source)
    at java.lang.Class.getMethod0(Unknown Source)
    at java.lang.Class.getMethod(Unknown Source)
    at sun.launcher.LauncherHelper.validateMainClass(Unknown Source)
    at sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)
Caused by: java.lang.ClassNotFoundException: com.beust.jcommander.ParameterException
    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)
    ... 7 more

原因：没有添加jcommander jar包
maven下载jcommander-1.48.jar包Builder path后执行成功