EventServiceBean.java 文件源码

/**
 * Tests whether this exception or any nested exception is a
 * {@link EntityExistsException}. Unfortunately {@link EJBException}
 * sometimes nests cause exception in {@link Throwable#getCause()},
 * sometimes in {@link EJBException#getCausedByException()}. Arrrrg.
 */
private boolean isEntityExistsException(final Throwable e) {
    if (e == null) {
        return false;
    }
    if (e instanceof PersistenceException) {
        return true;
    }
    if (e instanceof EJBException) {
        final EJBException ejbex = (EJBException) e;
        if (isEntityExistsException(ejbex.getCausedByException())) {
            return true;
        }
    }
    return isEntityExistsException(e.getCause());
}