Parameters is passing default value in TestNG

I'm facing the strange problem. Before writing here, I have done some research on this, but unable to solve the issue.

I'm passing parameters but it is taking the default value for the parameter ie "no-Value".

Here is my code

package rough;


import org.testng.annotations.AfterMethod;
import org.testng.annotations.Optional;
import org.testng.annotations.Parameters;
import org.testng.annotations.Test;
import org.testng.annotations.BeforeMethod;
import org.testng.Assert;

import java.util.regex.Pattern;
import java.util.concurrent.TimeUnit;

import org.junit.*;

import static org.hamcrest.CoreMatchers.*;

import org.openqa.selenium.*;
import org.openqa.selenium.chrome.ChromeDriver;
import org.openqa.selenium.firefox.FirefoxDriver;
import org.openqa.selenium.ie.InternetExplorerDriver;
import org.openqa.selenium.support.ui.Select;

public class Browsers {
    private WebDriver driver;
    private String baseUrl;
    private boolean acceptNextAlert = true;
    private StringBuffer verificationErrors = new StringBuffer();

    @BeforeMethod
    public void tearDown1() throws Exception {
        System.out.println("Hello starting");

    }
    @Test
    @Parameters({ "BROWSER" })
    public void setUp(@Optional String BROWSER) throws Exception {

        if(BROWSER.equalsIgnoreCase("FF"))
        {   
            driver = new FirefoxDriver();
        }
        else
        if(BROWSER.equalsIgnoreCase("IE"))
        {    
            System.setProperty("webdriver.ie.driver", "g:/Selenium Jar Files/IEDriverServer.exe");
            driver = new InternetExplorerDriver();
        }

        baseUrl = "http://book.theautomatedtester.co.uk/";
        driver.manage().timeouts().implicitlyWait(30, TimeUnit.SECONDS);

        System.out.println("Hello starting1111");
        driver.get(baseUrl+"/chapter1");
        driver.findElement(By.id("radiobutton")).click();
        Select(driver.findElement(By.id("selecttype"))).selectByVisibleText("Selenium RC");
    }

    @AfterMethod
    public void tearDown() throws Exception {

        String verificationErrorString = verificationErrors.toString();
        if (!"".equals(verificationErrorString)) {
            Assert.fail(verificationErrorString);
        }
    }

    private boolean isElementPresent(By by) {
        try {
            driver.findElement(by);
            return true;
        } catch (NoSuchElementException e) {
            return false;
        }
    }

    private boolean isAlertPresent() {
        try {
            driver.switchTo().alert();
            return true;
        } catch (NoAlertPresentException e) {
            return false;
        }
    }

    private String closeAlertAndGetItsText() {
        try {
            Alert alert = driver.switchTo().alert();
            String alertText = alert.getText();
            if (acceptNextAlert) {
                alert.accept();
            } else {
                alert.dismiss();
            }
            return alertText;
        } finally {
            acceptNextAlert = true;
        }
    }
}

The XML used here is

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE suite SYSTEM "http://testng.org/testng-1.0.dtd">
<suite name="Suite" parallel="True">
  <test name="Test">
  <parameter name = "BROWSER" value="FF"/>
    <classes>
          <class name="rough.Browsers"/>
    </classes>
    <test name="Test">
    <parameter name = "BROWSER" value="IE"/>
    <classes>
       <class name="rough.Browsers"/>
    </classes>
  </test> <!-- Test -->
</suite> <!-- Suite -->

When I'm running the code getting this error:

[TestNG] Running:
  C:UsersAdministratorAppDataLocalTemptestng-eclipse-2137105747testng-customsuite.xml

Hello starting
FAILED: setUp("not-found")
java.lang.NullPointerException
    at rough.Browsers.setUp(Browsers.java:55)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:84)
    at org.testng.internal.Invoker.invokeMethod(Invoker.java:714)
    at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:901)
    at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1231)
    at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:127)
    at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:111)
    at org.testng.TestRunner.privateRun(TestRunner.java:767)
    at org.testng.TestRunner.run(TestRunner.java:617)
    at org.testng.SuiteRunner.runTest(SuiteRunner.java:334)
    at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329)
    at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291)
    at org.testng.SuiteRunner.run(SuiteRunner.java:240)
    at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
    at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
    at org.testng.TestNG.runSuitesSequentially(TestNG.java:1224)
    at org.testng.TestNG.runSuitesLocally(TestNG.java:1149)
    at org.testng.TestNG.run(TestNG.java:1057)
    at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:111)
    at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:204)
    at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:175)

---

From testng documentation, this is how @optional is used.

@Parameters("db")
@Test
public void testNonExistentParameter(@Optional("mysql") String db) { ... }

If no parameter named "db" is found in your testng.xml file, your test method will receive the default value specified inside the @Optional annotation: "mysql".

Try by correcting your code accordingly. I think that should resolve the issue. If it still doesn't then declare the parameters at the suite tag level in testng.xml and test it.

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