Everything worked fine without Tile, then I decided to go further.
This is my problem: one layout page, several tiles, one of the tiles has the form, with struts-html tags. I'm using Validator too, but I don't think that is the problem.
When the tile with the form is going to be loaded into the layout, it fails, and layout stops loading. This is part of the exception message:
2004-12-16 00:46:55 StandardWrapperValve[action]: Servlet.service() for servlet action threw exception javax.servlet.jsp.JspException: ServletException in '/loginBar.jsp': org.apache.struts.taglibl.MessagesTei at org.apache.struts.taglib.tiles.InsertTag$InsertHandler.doEndTag(InsertTag.java:921) at org.apache.struts.taglib.tiles.InsertTag.doEndTag(InsertTag.java:460) at org.apache.jsp.auxLayout_jsp._jspx_meth_tiles_insert_2(auxLayout_jsp.java:198) at org.apache.jsp.auxLayout_jsp._jspService(auxLayout_jsp.java:114) at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94) at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)