I'm getting a NullPointerException when I pass a custom component as a
parameter to another custom component.
The files are:
test_fail.jsp (throws NPE):
<%@ page contentType="text/html; charset=ISO-8859-1"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<s:component template="myComponent.jsp">
<s:param name="body">
<s:component template="myComponent_nested.jsp" />
</s:param>
</s:component>
test_work.jsp (works ok):
<%@ page contentType="text/html; charset=ISO-8859-1"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<s:component template="myComponent_nested.jsp" />
myComponent.jsp:
<%@ page contentType="text/html; charset=ISO-8859-1" %>
<%@ taglib uri="/struts-tags" prefix="s" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd";>
<html>
<body>
<s:property value="%{parameters.body}" escape="false" />
</body>
</html>
myComponent_nested.jsp:
<%@ page contentType="text/html; charset=ISO-8859-1"%>
<%@ taglib uri="/struts-tags" prefix="s"%>
<p>Some text...</p>
<s:form namespace="/" action="index" method="post">
</s:form>
As you can see I'm passing the component myComponent_nested.jsp as a
parameter to the component myComponent.jsp. That fails if any struts2 tag is
used in myComponent_nested.jsp (if I don't use any struts2 tag it works).
The component myComponent.jsp works ok if I pass a string instead of a
myComponent_nested.jsp.
The stack trace follows:
2008-06-23 16:49:24,703 [ERROR]
org.apache.struts2.components.template.JspTemplateEngine - Could not render
JSP template /template/xhtml/myComponent.jsp
2008-06-23 16:49:24,703 [ERROR] org.apache.struts2.components.UIBean - error
when rendering
java.lang.NullPointerException
at org.apache.struts2.components.Include.include(Include.java:241)
at
org.apache.struts2.components.template.JspTemplateEngine.renderTemplate(JspTemplateEngine.java:55)
at org.apache.struts2.components.UIBean.mergeTemplate(UIBean.java:530)
at org.apache.struts2.components.UIBean.end(UIBean.java:484)
at
org.apache.struts2.views.jsp.ComponentTagSupport.doEndTag(ComponentTagSupport.java:43)
at
org.apache.jsp.paginas.test_fail_jsp._jspx_meth_s_005fcomponent_005f0(test_fail_jsp.java:118)
at
org.apache.jsp.paginas.test_fail_jsp._jspService(test_fail_jsp.java:68)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
at
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:831)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:413)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
at
org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
at java.lang.Thread.run(Thread.java:619)
Is this a bug or I'm doing something wrong?
Many thanks
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