If I have a class called 'exceptions' and it has only static classes, is this breaking Java standards?

If I have class like this, which is essentially just a package object, is it breaking standards to have it follow the package naming conventions? I thought I remembered reading this in the OCJP study guides. Seems logical but my co-worker called this out and I'm not sure if there is any official stance from oracle on this.

public class exceptions {

    public static class TemplateRenderException extends Exception {
        public TemplateRenderException(String message, Throwable e) {
            super(message, e);
        }
    }

    public static class UnmarshallingException extends Exception {
        public UnmarshallingException(String message, Throwable e) {
            super(message, e);
        }
    }
}