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.path;

public class CertPathValidationException
    extends Exception
{
    private final Exception cause;

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

    public CertPathValidationException(String msg, Exception cause)
    {
        super(msg);

        this.cause = cause;
    }

    public Throwable getCause()
    {
        return cause;
    }
}