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.openssl;

import java.io.IOException;

public class PEMException
    extends IOException
{
    Exception    underlying;

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

    public PEMException(
        String        message,
        Exception    underlying)
    {
        super(message);
        this.underlying = underlying;
    }

    public Exception getUnderlyingException()
    {
        return underlying;
    }


    public Throwable getCause()
    {
        return underlying;
    }
}