Am 10.02.2020 22:43, schrieb Richard Monson-Haefel:
Thanks, Mark. Your explanation was good but the code didn't do it.
Then try
${pageContext.servletConfig.getInitParameter("greeting_color")}
Felix
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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