>
> Method 1
>
> <jsp:forward page="page2.jsp" />
>         <jsp:param name="P_USERNAME" value="SUPER" />
>         <jsp:param name="P_PASSWORD" value="TOMCAT" />
> </jsp:forward>
>
> Error: /myexamples/page1.jsp:9: GNUJSP: illegal parameter tag
>

I think this might be due to the closing tag "/>" in the first line.

> Method 2
>
> <%
> String Username = "SUPER";
> String Password = "TOMCAT";
> %>
> <jsp:forward
> page="page2.jsp?P_USERNAME=<%=Username%>&P_PASSWORD=<%=Password%>" />
>
> Error: /myexamples/page1.jsp:8: runtime attribute: multiple
> expressions and mixing of expressions and string constants not permitted:

I seem to remeber a recent post about this "dynamic forward tag"...
Try building the "page" string outside the <jsp:forward>

Ex
<% String destination  = "page2.jsp?P_USERNAME=" + Username + "&P_PASSWORD="
+ Password; %>
<jsp:forward page="<%= destination %>" />

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