> I have developed a small web-based aplication. I use an ant build script
> to compile it and to generate a war. The application is used in several
> servers with different settings (it uses different databases, connects to
> different xml-rpc resources...) so it has to somehow read the
> configuration from the server environment.
> I have used the tomcat Web server administration tool to set Resources - a
> data source and several Environment Entries. The tool regenerates
> server.xml file in such a manner:
>
> <Server>
> ...
> <GlobalNamingResources>
> <Environment description="" name="BLAH_USER" type="java.lang.String"
> value="MrSpock"/>
> ...
> </GlobalNamingResources>
> ...
> </Srver>
>
> Then I change my deployment descriptor get access to this environment:
> <web-app>
> ...
> <resource-env-ref>
> <resource-env-ref-name>BLAh_USER</resource-env-ref-name>
> <resource-env-ref-type>java.lang.String</resource-env-ref-type>
> </resource-env-ref>
> ...
> </web-app>
>
> The code, that tryes to read this environmnt looks like this:
>
> Context initCtx = new InitialContext();
> Context envCtx = (Context) initCtx.lookup("java:comp/env");
> String res_user = (String) envCtx.lookup("BLAH_USER");
>
> The problem is, that I get this exception:
> javax.naming.NamingException: Cannot create resource instance
> at
> org.apache.naming.factory.ResourceEnvFactory.getObjectInstance(ResourceEnvFactory.java:146)
> at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:301)
> at org.apache.naming.NamingContext.lookup(NamingContext.java:837)
> at org.apache.naming.NamingContext.lookup(NamingContext.java:197)
> at myapp.servlets.MyAppListener.contextInitialized(MyAppListener.java:123)
>
> When I try to access a mapped JDBC resource everything seems to be OK.
> When I list (NamingEnumeration enum = initCtx.list("java:comp/env");) the
> keys for mapped resources BLAH_USER appears.
>
> I have tried look this situation in the Tomcat documentation and to google
> it, but I haven't get any reasonable idea to solve it.
I have done some other tests and I can't find the right solution. Stop me,
when I become wrong:
1) Enteries in <GlobalNamingResources> are accesible for the whole
server including all deployed applications.
2) When I include <Environment> element into <GlobalNamingResources> a new
Environment variable should be accessible in all applications. It should
do the same thing as adding <env-entry> into web.xml, that works for me.
3) The defined variable appears in the JNDI namespace of an application,
when it's mapped into it by specifiing <resource-env-ref> in web.xml.
4) I appears as java:comp/env/VAR_NAME.
5) There should'n be no problem for Tomcat to construct instances of
java.lang.String or java.lang.Integer.
--
S pozdravem
Ondrej Nekola
[EMAIL PROTECTED]
http://www.matfyz.cz/ondra
ICQ# 160692888
PS: My environment - windows2k, JDK 1.4.2 and 1.5.0 beata, Tomcat 5.0.16,
5.0.18 and 4.1.27.
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