http://www.bouncycastle.org/java.html: The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 to JDK 1.8. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.cmc;

public class CMCException
    extends Exception
{
    private final Throwable cause;

    public CMCException(String msg)
    {
        this(msg, null);
    }

    public CMCException(String msg, Throwable cause)
    {
        super(msg);
        this.cause = cause;
    }

    public Throwable getCause()
    {
        return cause;
    }
}