Passing parameter to a portal page that display a WSRP portlet ?

I have created, deployed and regisered a WSRP portlet to Portal 10.1.4. I also create a portal page used to render this portlet. I would like to pass in a parameter xx (thru the HTTPRequest) when calling this page and have it visible to the portlet inside the page. Something like http://host:port/portal/page/portal/myPortlets/portletA?xx=123 where
"http://host:port/portal/page/portal/myPortlets/portletA" represented my portal page and "xx=123" is what I want my page to see.
Is it even possible/support by Portal 10.1.4 ?
Thanks.
Kim

HI Alejandro,
Did the same what you have told me. I am getting the following error
oracle.jbo.JboException: JBO-29114 ADFContext is not setup to process messages for this exception. Use the exception stack trace and error code to investigate the root cause of this exception. Root cause error code is JBO-29000. Error message parameters are {0=java.io.EOFException, 1=null}
at oracle.adf.model.bc4j.DCJboDataControl.setCurrentRowWithKey(DCJboDataControl.java:1554)
at oracle.adf.model.binding.DCIteratorBinding.setCurrentRowWithKey(DCIteratorBinding.java:3829)
at oracle.jbo.uicli.binding.JUCtrlActionBinding.doIt(JUCtrlActionBinding.java:1588)
at oracle.adf.model.binding.DCDataControl.invokeOperation(DCDataControl.java:2189)
at oracle.jbo.uicli.binding.JUCtrlActionBinding.invoke(JUCtrlActionBinding.java:751)
at oracle.adf.controller.v2.lifecycle.PageLifecycleImpl.executeEvent(PageLifecycleImpl.java:407)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlActionBinding._execute(FacesCtrlActionBinding.java:255)
at oracle.adfinternal.view.faces.model.binding.FacesCtrlActionBinding.execute(FacesCtrlActionBinding.java:213)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at com.sun.el.parser.AstValue.invoke(AstValue.java:254)
at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:302)
Thanks

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