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.tsp;

import java.io.IOException;

public class TSPIOException
    extends IOException
{
    Throwable underlyingException;

    public TSPIOException(String message)
    {
        super(message);
    }

    public TSPIOException(String message, Throwable e)
    {
        super(message);
        underlyingException = e;
    }

    public Exception getUnderlyingException()
    {
        return (Exception)underlyingException;
    }

    public Throwable getCause()
    {
        return underlyingException;
    }
}