/** Override toString method to provide information on nested exceptions. */
public synchronized String toString() {
String s = super.toString();
Exception n = next;
if (n == null) return s;
StringBuffer sb = new StringBuffer(s == null ? "" : s);
while (n != null) {
sb.append(";\n nested exception is:\n\t");
if (n instanceof MessagingException) {
MessagingException mex = (MessagingException) n;
sb.append(mex.superToString());
n = mex.next;
} else {
sb.append(n.toString());
n = null;
}
}
return sb.toString();
}
