How can I loop through Exception getCause() to find root cause with detail message [duplicate]

Answer 1

In APACHE; the implementation is like below.

The highlight is list.contains(throwable) == false

public static Throwable getRootCause(final Throwable throwable) {
    final List list = getThrowableList(throwable);
    return list.size() < 2 ? null : (Throwable)list.get(list.size() - 1);
}

public static List getThrowableList(Throwable throwable) {
    final List list = new ArrayList();
    while (throwable != null && list.contains(throwable) == false) {
        list.add(throwable);
        throwable = ExceptionUtils.getCause(throwable);
    }
    return list;
}