When we use Semaphore in the consumer and producer buffer

I am working on a BoundedBuffer class for consumer and producer, we want to use Semaphore in this class, we did it, but there is an error every time we use acquire () rerror:

unregistered exception java.lang.InterruptedException; must be caught or declared abandoned

Here is the code:

import java.util.concurrent.Semaphore;

public class BoundedBuffer implements Buffer { 
    private static final int   BUFFER_SIZE = 4;

    /**
     * volatile does not appear in the printed text. A discussion of
     * volatile is in chapter 7.
     */
    private volatile int count;
    private Object[] buffer;
    private int in;   // points to the next free position in the buffer
    private int out;  // points to the next full position in the buffer

    private Semaphore  mutex;
    private Semaphore  empty;
    private Semaphore full;

    public BoundedBuffer() { //constractur
        // buffer is initially empty
        //count = 0;
        in = 0;
        out = 0;

        buffer = new Object[BUFFER_SIZE];

        mutex = new Semaphore(1);
        empty = new Semaphore(BUFFER_SIZE);
        full = new Semaphore(0);
    }

    // producer calls this method
    public void insert(Object item) {
        //while (count == BUFFER_SIZE) 
        // ; // do nothing the brach full

        // add an item to the buffer
        // ++count;

        empty.acquire();
        mutex.acquire();
        buffer[in] = item;
        in = (in + 1) % BUFFER_SIZE;//that to do cyrcle or to go to the begining againe
/*
        if (count == BUFFER_SIZE)
            System.out.println("Baker put " + item + " Shelf FULL");
        else
            System.out.println("Baker put " + item + " Shelf Size = " +  count);
*/


        mutex.release();
        full.release();

    }

    // consumer calls this method
    public Object remove() {
        //Object item;
        full.acquire();
        mutex.acquire();

        //while (count == 0) 
            ; // do nothing the buffer is empty

        // remove an item from the buffer
        //--count;

        Object item = buffer[out];
        out = (out + 1) % BUFFER_SIZE;
        mutex.release();
        empty.release();
        return item;
    }
}