Thanks, Mark. Your explanation was good but the code didn't do it.
On Mon, Feb 10, 2020 at 12:10 PM Mark Thomas <ma...@apache.org> wrote:
> On 10/02/2020 18:03, Richard Monson-Haefel wrote:
> > Hi Simon,
> >
> > Thanks for the response but I don't think that is the issue. I can use
> the
> > <context-param> instead, but I want to use the initParam for the JSP page
> > which is named and mapped in the <servlet> element. Perhaps I'm still
> > missing something.
>
> The EL implicit object initParam holds the *ServletConext*'s init
> params, not the Servlet's.
>
> You probably want something like (untested)
>
> ${ pageContext.servletConfig.initParameter("greeting_color") }
>
> Mark
>
>
> >
> > On Mon, Feb 10, 2020 at 12:00 PM Simon Funnell <simonfunn...@gmail.com>
> > wrote:
> >
> >> In your web.xml you want:
> >>
> >> <context-param>
> >> <param-name>greeting_color</param-name>
> >> <param-value>green</param-value>
> >> </context-param>
> >>
> >> I think you have defined an initialization parameter for the servlet,
> not
> >> the context.
> >>
> >> On Mon, 10 Feb 2020 at 17:54, Richard Monson-Haefel <
> >> monsonhae...@gmail.com>
> >> wrote:
> >>
> >>> Hi,
> >>>
> >>> Tomcat version: 9.0.30
> >>> Operating System: macOS 10.15.2
> >>>
> >>> While I can access my initParam vis a JSP scriptlet I cannot access the
> >>> same initial paramter EL expression.
> >>>
> >>> Here is the JSP code I'm using
> >>>
> >>> <HTML>
> >>> <BODY>
> >>> <H1>
> >>> <font color="<%= config.getInitParameter("greeting_color")
> >>> %>">Hello</font><font color="black"> ${param.name} from
> hello.jsp</font>
> >>>
> >>> </H1>
> >>> color is ${initParam["greeting_color"]}
> >>> </BODY>
> >>> </HTML>
> >>>
> >>> Here is my web.xml declaring the initial parameters
> >>>
> >>> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee";
> >>> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> >>> xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee
> >>>
> http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd
> >> "
> >>> version="4.0"
> >>> metadata-complete="true">
> >>>
> >>>
> >>> <!-- JSP Mapping -->
> >>> <servlet>
> >>> <servlet-name>HiJsp</servlet-name>
> >>> <jsp-file>/hello.jsp</jsp-file>
> >>> <init-param>
> >>> <param-name>greeting_color</param-name>
> >>> <param-value>green</param-value>
> >>> </init-param>
> >>> </servlet>
> >>> <servlet-mapping>
> >>> <servlet-name>HiJsp</servlet-name>
> >>> <url-pattern>/hola/*</url-pattern>
> >>> </servlet-mapping>
> >>> </web-app>
> >>>
> >>> Here is the output (source)
> >>>
> >>> <HTML>
> >>> <BODY>
> >>> <H1>
> >>> <font color="green">Hello</font><font color="black"> richard from
> >>> hello.jsp</font>
> >>> </H1>
> >>> color is
> >>> </BODY>
> >>> </HTML>
> >>>
> >>> I don't understand why the JSP expression <%= %> works but the EL
> >>> expression ${ } doesn't. I've tried many variations and other EL
> >> implicit
> >>> objects I've tried worked fine.
> >>>
> >>> What am I missing?
> >>>
> >>> The WAR is attached for your convenience.
> >>>
> >>>
> >>>
> >>> --
> >>> Richard Monson-Haefel
> >>> https://twitter.com/rmonson
> >>> https://www.linkedin.com/in/monsonhaefel/
> >>>
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> >>
> >
> >
>
>
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>
--
Richard Monson-Haefel
https://twitter.com/rmonson
https://www.linkedin.com/in/monsonhaefel/
