<s:form action="search" method="post">
    <s:textfield name="query" placeholder="Enter movie title..." cssClass="searchbox" />
    <s:submit type="image" src="images/btn_search.gif" />
</s:form>

<action name="search" class="ph.watchy.action.SearchAction">
    <result>/search-result.jsp</result>
    <result name="input">/index.jsp</result>
</action>

public class SearchAction extends ActionSupport implements RequestAware, Message {
    private static final long serialVersionUID = 1L;

    private Map<String, Object> request;

    private String query;

    @Override
    public String execute() throws Exception {
        // business logic
        request.put("searchResults", searchResults);

        return SUCCESS;
    }

    @Override
    public void validate() {
        if(new UserManager().isFieldBlank(getQuery())) {
            addFieldError("query", BLANK_SEARCH);
        }
    }

    @Override
    public void setRequest(Map<String, Object> request) {
        this.request = request;
    }

    public String getQuery() {
        return query;
    }

    public void setQuery(String query) {
        this.query = query;
    }
}