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A Java event based WebSocket and HTTP server

There is a newer version: 0.4.15

package org.webbitserver.helpers;

public class Hex {
    public static String toHex(byte[] bytes) {
        StringBuilder sb = new StringBuilder(bytes.length * 2);
        for (byte b : bytes) {
            int v = b & 0xff;
            if (v < 16) {
                sb.append('0');
            }
            sb.append(Integer.toHexString(v));
        }
        return sb.toString().toUpperCase();
    }
}