Why EL doesn't work with custom tags ?!
I don't know why expression lang. doesn't work with me.
here's an example, and please tell me why :
--- the jsp page with EL ==> doesn't work :
<%-- In the name of ALLAH most gacious most merciful --%>
<%@ page language="java" %>
<%@ taglib uri="/cartlib" prefix="cart" %>
<html>
<jsp:useBean id="product" class="ch16.cart.ProductCatalog" scope="application" />
<cart:showCatalog productCatalog="${product}" addToShoppingCartUri="<%= response.encodeURL("AddToShoppingCart.jsp") %>" />
</html>
when using expressions instead, the page works .
the new page is :
<%-- In the name of ALLAH most gacious most merciful --%>
<%@ page language="java" %>
<%@ taglib uri="/cartlib" prefix="cart" %>
<html>
<jsp:useBean id="product" class="ch16.cart.ProductCatalog" scope="application" />
<cart:showCatalog productCatalog="<%= product %>"
addToShoppingCartUri="<%=
response.encodeURL("AddToShoppingCart.jsp") %>" />
</html>
The error was :
HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
org.apache.jasper.JasperException: jsp.error.beans.property.conversion
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper
.java:512)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:377)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
root cause
org.apache.jasper.JasperException: jsp.error.beans.property.conversion
org.apache.jasper.runtime.JspRuntimeLibrary.getValueFromPropertyEditorManager(Js
pRuntimeLibrary.java:885)
org.apache.jsp.ShowProductCatalog_jsp._jspService(ShowProductCatalog_jsp.java:77
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:97)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:334)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:314)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:264)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.20 logs.
Regarding setup, see this post reply #6
http://forum.java.sun.com/thread.jspa?threadID=629437&tstart=0
Other potential things to check: make sure you are getting the right value passed in
productCatalog="${applicationScope.product}"
${product} by preference would take a pageContext, request or session attribute before the application level one (it uses pageContext.findAttribute).
What do you get if you just print out ${product} on the screen?
It should call a toString() on it for rendering purposes.
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