Exception when deploying a JSR 286 portlet into WebLogic+WebCenter 11g - oracle

Question

I get the following exception when deploying a JSR 286 portlet into Oracle WebLogic Server 11g (to deploy it later in Oracle WebCenter 11g):
<19-ene-2010 13H32' CET> <Error> <oracle.portlet.server.containerimpl.PortletApplicationImpl> <BEA-000000> <Error al procesar el archivo "/WEB-INF/portlet.xml" en la lÝnea 6 columna 68.
org.xml.sax.SAXParseException: cvc-elt.1: Cannot find the declaration of element 'portlet-app'
The error message is in spanish. It means:
"Error processing the file "/WEB-INF/portlet.xml at line 6 column 68"
The portlet.xml of my portlet seems to be correct and I've deployed it in other portal servers. So I don't understand the error message.
This is the portlet.xml of my portlet (eclipse XML validator said it was a valid XML)
<?xml version="1.0" encoding="UTF-8"?>
<portlet-app version="2.0"
xmlns="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd
http://java.sun.com/xml/ns/portlet/portlet-app_2_0.xsd"
xmlns:dnd="http://www.denodo.com/widget/portlet/portletjsr286">
<portlet>
<description>Test Inter Portlet Communication (JSR286)</description>
<portlet-name>Test IPC</portlet-name>
<display-name>Test IPC</display-name>
<portlet-class>com.denodo.ipc.TestIPCPortlet</portlet-class>
<supports>
<mime-type>text/html</mime-type>
<portlet-mode>VIEW</portlet-mode>
</supports>
<supported-locale>en</supported-locale>
<resource-bundle>PortletMessages</resource-bundle>
<portlet-info>
<title>Test IPC</title>
<short-title>Test IPC</short-title>
<keywords>Test IPC,Denodo</keywords>
</portlet-info>
</portlet>
</portlet-app>
How do I deploy my portlet
I convert my portlet into to a WSRP portlet by executing
java -jar wsrp-predeploy.jar source EAR target EAR
as explained in http://download.oracle.com/docs/cd/E12839_01/webcenter.1111/e12405/wcadm_portlet_prod.htm#CHDECJHI)
I try to deploy it into WebLogic with the WebLogic Console and I get this exception.
My Environment
WebCenter Suite (11.1.1.2.0) + WebLogic Server (10.3.2) downloaded from the oracle.com. Default configuration
S.O: Windows XP SP3
Thanks in advance for your time.

Answer 1

Have you tried using the openPortal portlet-container? The doc says it will install onto weblogic: https://portlet-container.dev.java.net/public/Download.html
Update: I just installed the portlet-container into the weblogic container and successfully deployed one of the sample portlets from this page: \http://portlet-container.dev.java.net/public/Samples.html