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.operator;

import java.io.IOException;

public class OperatorStreamException
    extends IOException
{
    private Throwable cause;

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

        this.cause = cause;
    }

    public Throwable getCause()
    {
        return cause; 
    }
}