Use Selenium JUnit Java + JMeter for Load testing.

In Eclipse started the test, everything is ok, after make a JAR file and put it in apache/lib/junit directory, starting JMeter choose this JAR file, and it's crashed with error. I was reading a lot of answer on stackoverflow and other siter, but nothing find that can help me.

Here's log: 

```
2015/06/10 18:10:41 INFO  - jmeter.threads.JMeterThread: Thread started: Thread Group 1-1 
2015/06/10 18:10:49 ERROR - jmeter.protocol.java.sampler.JUnitSampler: Error instantiating class:class LoadTestGuppy.LoadTestGuppy.AppTest:null java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)

```

and code:

```
package LoadTestGuppy.LoadTestGuppy;

import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.firefox.FirefoxDriver;

import java.util.concurrent.TimeUnit;

import junit.framework.TestCase;

public class AppTest extends TestCase {
    private WebDriver driver = new FirefoxDriver();

    public AppTest(){}

    public AppTest(String text){
        super(text);
    }

    @Before
    public void setUp() throws Exception {
        driver.get("http://barracuda-qa.ko.kodak.com/d2l/faces/Login.jsp");
        driver.manage().window().maximize();
    }

    @Test
    public void testTestLoad() throws Exception {
        driver.findElement(By.id("loginForm:authLogin")).sendKeys("some222");
        driver.findElement(By.id("loginForm:authPassword")).sendKeys("222");
        driver.manage().timeouts().implicitlyWait(60, TimeUnit.SECONDS);
        driver.findElement(By.id("loginForm:btnLogin")).click();
        driver.manage().timeouts().implicitlyWait(2000, TimeUnit.SECONDS);
        driver.findElement(By.xpath("//a[@class='log']")).click();
        driver.manage().timeouts().implicitlyWait(2000, TimeUnit.SECONDS);
        driver.findElement(By.xpath("//a[@class='logout']")).click();

    }

    @After
    public void tearDown() throws Exception {
        driver.close();
    }

}

```

What it can be?