http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.crypto.tls;


RFC 5246 7.2

/**
 * RFC 5246 7.2
 */
public class AlertLevel
{
    public static final short warning = 1;
    public static final short fatal = 2;

    public static String getName(short alertDescription)
    {
        switch (alertDescription)
        {
        case warning:
            return "warning";
        case fatal:
            return "fatal";
        default:
            return "UNKNOWN";
        }
    }

    public static String getText(short alertDescription)
    {
        return getName(alertDescription) + "(" + alertDescription + ")";
    }
}