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https://issues.apache.org/struts/browse/WW-2762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=44846#action_44846
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John Norvell commented on WW-2762:
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This appears to be a show-stopper issue with no apparent work around.
What seems to be happening is that the NPE is thrown from the UrlHelper
whenever a tile JSP page defines a s:form, and one of it's subtile JSP files
has one or more of the form's fields.
Here is a simplified test case:
/tiles-test-defs.xml
<!DOCTYPE tiles-definitions PUBLIC
"-//Apache Software Foundation//DTD Tiles Configuration 2.0//EN"
"http://tiles.apache.org/dtds/tiles-config_2_0.dtd";>
<tiles-definitions>
<definition name="MainTile" template="/test/main.jsp">
<put-attribute name="app_title" value="WW-2762" />
<put-attribute name="subtile" value="/test/subtile.jsp" />
</definition>
</tiles-definitions>
/main.jsp
<!DOCTYPE html PUBLIC "~//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd";>
<%@ page contentType="text/html;charset=cp1252" language="java"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib uri="http://tiles.apache.org/tags-tiles"; prefix="tiles"%>
<html>
<head>
<title><tiles:insertAttribute name="app_title" />
</title>
</head>
<body>
<div id="content_tile">
<s:form namespace="/vpn" action="vpnManagement">
<tiles:insertAttribute name="subtile" />
</s:form>
</div>
</body>
</html>
/subtile.jsp
<%@ page contentType="text/html;charset=cp1252" language="java"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<%@ taglib uri="http://tiles.apache.org/tags-tiles"; prefix="tiles"%>
<s:textfield name="selectedAction" size="12" />
> struts2 nested tiles
> --------------------
>
> Key: WW-2762
> URL: https://issues.apache.org/struts/browse/WW-2762
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - Tiles
> Affects Versions: 2.0.6
> Environment: Windows XP Professional, MyEclipse 6.0.1, Struts2, Tiles
> 2.0.6, J2EE 1.4, JDK 5.0, JBoss 4.2.2
> Reporter: Bips Sadhwani
>
> I have this wierd issue with tiles. Probably its a bug.
> I am trying to insert a tile (a jsp page) into another tile (a jsp page) and
> so this is my config (simplified):
>
> tiles.xml
> ---------
>
> <definition name="rootPage.index" template="layout.jsp">
> <put-attribute name="pagetitle" value="Page Body Title" />
> <put-attribute name="header" value="header.jsp" />
> <put-attribute name="footer" value="footer.jsp" />
> </definition>
>
> <definition name="searchEmployee.index" extends="rootPage.index">
> <put-attribute name="body" value="searchEmpBody.index" />
> <definition name="searchEmpBody.index"
> template="/searchEmployee.jsp"/>
> </definition>
>
> <definition name="status.index" template="/status.jsp">
> </definition>
>
> layout.jsp
> -----------
>
> <body>
> <div class="container">
> <div id="header">
> <tiles:insertAttribute name="header" />
> </div>
>
> <div id="mainContent">
> <tiles:insertAttribute name="body" />
> </div>
> </div>
> </body>
> Now following are the things I try on my searchEmployee.jsp
>
> searchEmployee.jsp - This works
> <%@ taglib prefix="tiles" uri="http://tiles.apache.org/tags-tiles"%>
> <%@ taglib prefix="s" uri="/struts-tags" %>
>
> <tiles:insertDefinition name="status.index"/>
> searchEmployee.jsp - This also works
> <%@ taglib prefix="tiles" uri="http://tiles.apache.org/tags-tiles"%>
> <%@ taglib prefix="s" uri="/struts-tags" %>
>
> <s:form action="listEmployees">
> <tiles:getAsString name="pagetitle"/>
> </s:form>
> searchEmployee.jsp - This does work (only if I use tiles:insertDefinition
> below s:form)
> <%@ taglib prefix="tiles" uri="http://tiles.apache.org/tags-tiles"%>
> <%@ taglib prefix="s" uri="/struts-tags" %>
>
> <s:form action="listEmployees">
> </s:form>
> <tiles:insertDefinition name="status.index"/>
> searchEmployee.jsp - This does NOT work (if I use tiles:insertDefinition
> above or within s:form things don't work)
> <%@ taglib prefix="tiles" uri="http://tiles.apache.org/tags-tiles"%>
> <%@ taglib prefix="s" uri="/struts-tags" %>
>
> <s:form action="listEmployees">
> <tiles:insertDefinition name="status.index"/>
> </s:form>
> I get a long exception stack trace which basically says nullptrexception.
> I've done the same thing using tiles1.x and it has always worked.
> Tks
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