Problem with ReEnterent lock

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Java

JavaSE

JavaSE6

JavaFX

When one thread acquire Interruptibly lock on one method and goes for sleep , And another thread run and try to lock the same method it should throw exception but i am not getting any exception.

import java.util.concurrent.locks.ReentrantLock;
import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
* Java program to show, how to use ReentrantLock in Java.
* Reentrant lock is an alternative way of locking
* apart from implicit locking provided by synchronized keyword in Java.
*
* @author Javin Paul
*/
public class ReentrantLockHowto implements Runnable {

public void run(){
ReadFile();
}

private final ReentrantLock lock = new ReentrantLock();

public void ReadFile() {

try {
lock.lockInterruptibly();
String line = "";
FileReader fileReader = new FileReader("D:\\TestFile1.txt");
BufferedReader reader = new BufferedReader(fileReader);
while ((line = reader.readLine()) != null) {
System.out.println("Thread read " + Thread.currentThread().getName() + " : "+ line);
Thread.sleep(10000);
}
System.out.println(Thread.currentThread().getName() + " : file read successfuly");
} catch (Exception e) {
System.out.println("Read" + e.getMessage());
} finally {
lock.unlock();
System.out.println(Thread.currentThread().getName() + " : finaly file read successfuly");
}
}


public static void main(String args[]) {
try{
ReentrantLockHowto counter = new ReentrantLockHowto();
Thread t1 = new Thread(counter);
Thread t2 = new Thread(counter);
t1.start();
t2.start();
}
catch (Exception e)
{
System.out.println("Main Exception " + e.getMessage());
}

}
}