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.cert.cmp;

public class CMPException
    extends Exception
{
    private Throwable cause;

    public CMPException(String msg, Throwable cause)
    {
        super(msg);

        this.cause = cause;
    }

    public CMPException(String msg)
    {
        super(msg);
    }

    public Throwable getCause()
    {
        return cause;
    }
}