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Posted to user@struts.apache.org by "Hohlen, John" <JH...@erac.com> on 2002/09/10 23:44:23 UTC
RE: Question: Configuring Multiple Elements W
ith Sub-Applications
Well, I think I finally figured all this stuff out. It sure wasn't clear
from any of the documentation I looked at. I'm not slamming the documenters
out there b/c I know how it is. I just thought somewhere I'd find a clear
explanation on this. I think the sub-application feature is one of the best
things about Struts 1.1: Here's what you need to know:
1) Whatever key name you specify for a "message-resource" in a sub-app
config file (e.g. SUB_APP_A_MESSAGES_KEY in my example below) gets a "/"
plus the module name concantenated to it. So in my example, the message
resource object (properties) gets stored in application scope under the key
name "SUB_APP_A_MESSAGES_KEY/sub-app-a".
2) In your JSP file, if you want to use the <html:errors> tag and the error
messages are in a sub-app's message resource file, you'll need to specify
the resource bundle. For example:
<html:errors bundle="SUB_APP_A_MESSAGES_KEY/sub-app-a" />
Be sure to include the errors.header, errors.footer, errors.prefix, and
errors.suffix key/value pairs each sub-app's message resource file if you're
using the <html:errors> tag. This was one thing I don't like about this
approach. These header keys are duplicated across files -- if you're
placing error messages for each sub-app in the corresponding message
resource file. Unless I'm missing something, I think these header keys must
be in the same file as the error message.
3) To write text in a JSP from a sub-app's message resource file, be sure to
include the sub-app bundle:
<bean:message key="copyright.notice"
bundle="SUB_APP_A_MESSAGES_KEY/sub-app-a"/>
Note:
-----
Now that I understand the naming convention for the keys to store/retrieve
message resources by sub-app, I thought my convention was redundant.
Therefore I changed the key name in ALL my sub-app config files to just be
"MESSAGE". For example:
<message-resources key="MESSAGE"
parameter="com.abc.training.LoginMessages"
null="false"/>
This will result in key names as follows:
MESSAGE/sub-app-a
MESSAGE/sub-app-b
MESSAGE/sub-app-c
...
Whew! I finally got this working!!
JOHN
-----Original Message-----
From: Hohlen, John
Sent: Tuesday, September 10, 2002 12:56 PM
To: 'Struts Users Mailing List'
Subject: RE: Question: Configuring Multiple <message-resources> Elements
W ith Sub-Applications
Whoops! In my examples below, the <action> tags should actually be
<action-mappings>. That was a cut-and-paste error on my part and not
relevant to this problem. I fixed the examples in this reply.
-----Original Message-----
From: Hohlen, John
Sent: Tuesday, September 10, 2002 11:43 AM
To: Struts-Help (E-mail)
Cc: 'chuckcavaness@attbi.com'
Subject: Question: Configuring Multiple <message-resources> Elements
With Sub-Applications
If I'm using multiple message resource files with sub-applications, do I
need declare all the message resource files in the default struts config
file or do I declare each message resource file in the corresponding
sub-app's struts config file? I searched the mailing lists, Struts
documentation, and the online chapter's in Chuck Cavaness' upcoming Struts
book (O'Reilly). I have not found a clear example on how to do this.
Example #1 - Declaring All Message Resources In struts-config.xml:
=================================================================
--- struts-config.xml-----
<struts-config>
<message-resources parameter="com.abc.training.Messages"
null="false"/>
<message-resources key="SUB_APP_A_MESSAGES_KEY"
parameter="com.abc.training.SubAppAMessages"
null="false"/>
</struts-config>
--- struts-config-sub-app-a.xml-----
<struts-config>
<form-beans>
...
</form-beans>
<action-mappings>
...
</action-mappings>
</struts-config>
Example #2 - Declaring Each Message Resource In Each Sub App's
struts-config-xml:
============================================================================
====
--- struts-config.xml-----
<struts-config>
<message-resources parameter="com.abc.training.Messages"
null="false"/>
</struts-config>
--- struts-config-sub-app-a.xml-----
<struts-config>
<form-beans>
...
</form-beans>
<action-mappings>
...
</action-mappings>
<message-resources key="SUB_APP_A_MESSAGES_KEY"
parameter="com.abc.training.SubAppAMessages"
null="false"/>
</struts-config>
I can't get either approach to work. If I use approach #1, error keys are
not properly located for errors placed in the errors container by
sub-application A. Hence, error mesages appear as "???en_US.<key>???. But
this approach does work for JSP text retrieved from sub-app A's message
resource file (as long as I specify the "bundle" attribute).
If I use approach #2, I get the following exception (WebLogic 6.1 with SP2
or SP3):
javax.servlet.ServletException: Cannot find message resources under key
SUB_APP_A_MESSAGES_KEY
at
weblogic.servlet.internal.RequestDispatcherImpl.forward(RequestDispatcherImp
l.java:256)
at
org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:10
14)
at
org.apache.struts.action.RequestProcessor.processForwardConfig(RequestProces
sor.java:417)
at
org.apache.struts.action.RequestProcessor.processActionForward(RequestProces
sor.java:390)
at
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:271)
at
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1292)
at
com.erac.fleetsystems.strutsx.FleetSystemsServlet.process(FleetSystemsServle
t.java:178)
at
org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:492)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:265)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:200)
at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:2495)
at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2204)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:139)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:120)
I believe approach #2 makes the most sense, but I keep getting the above
servlet exception. FYI - I have the folllowing in my web.xml file for
either approach:
<init-param>
<param-name>config</param-name>
<param-value>/WEB-INF/struts-config.xml</param-value>
</init-param>
<init-param>
<param-name>config/subAppA</param-name>
<param-value>/WEB-INF/struts-config-sub-app-a.xml</param-value>
</init-param>
Thanks in advance for your help.
JOHN HOHLEN
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