対応しました。ありがとうございます！ははは。。。 <div>2007/10/10, Yasuo Higa <<a href="mailto:higa@isid.co.jp">higa@isid.co.jp</a>>: <blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">Hi, guys. > > Can't get params.. > > When i use "params.get("form:date") != null", it throws params is null. > > Is there anything else i should do? > Sorry, I was wrong. m(_ _)m "param" is correct. So, you should define your page class as follows: private Map param; public Map getParam() { return param; } public void setParam(Map param) { this.param = param; } public Validator getDateValidator() { ValidatorChain chain = new ValidatorChain(); TRequiredValidator validator = new TRequiredValidator(); if (param.get("TestForm:date") != null) {    chain.add(validator); } return chain; } -- Yasuo Higa <a href="mailto:higa@isid.co.jp">higa@isid.co.jp</a> _______________________________________________ Seasar-user mailing list <a href="mailto:Seasar-user@ml.seasar.org">Seasar-user@ml.seasar.org</a> <a href="https://ml.seasar.org/mailman/listinfo/seasar-user">https://ml.seasar.org/mailman/listinfo/seasar-user</a> </blockquote></div>