My own experience and what I have read on this and another user list, is that the
kinks with accessing a datasource in the < GlobalNamingResources> element have only
just been worked out with version 5. Now you can access the global datasource with
just a resource link in your web app <Context>. Previously (in version 4.1.27 and
lower) I had to put the whole data source element in the <Context> element of every
web app. By contrast, you can now put your web app <Context> element in a separate
XML file at $CATALINA_HOME/conf/Catalina/localhost, where the prefix of the XML file
name is the same name as the web application. That keeps your server.xml from getting
too cluttered.
But given all of the problems people have had just accessing a global data source, I
would be surprised if you can do it from your source code, with no resource link
specified. And not to meddle, but wouldn't doing so tightly couple your web app to
your data source details?
-----Original Message-----
From: Miguel Vieira [mailto:[EMAIL PROTECTED]
Sent: Thu 9/25/2003 9:18 AM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: Accessing GlobalNamingResources
Thank you for the reply João.
I've tried the code with no success, all I got was:
javax.naming.NameNotFoundException: Name leaders.archive is not bound
in this Context
...
My server.xml file has the following GlobalNamingResources:
<Listener
className="org.apache.catalina.mbeans.GlobalResourcesLifecycleListener"
debug="0"/>
<GlobalNamingResources>
<Environment description="This is a test!" name="leaders.archive"
override="false" type="java.lang.String" value="LEADERS Archive"/>
<Environment name="simpleValue" override="true"
type="java.lang.Integer" value="30"/>
<Resource auth="Container" description="User database that can be
updated and saved" name="UserDatabase" scope="Shareable"
type="org.apache.catalina.UserDatabase"/>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
</GlobalNamingResources>
Do I need to create a ResourceLink in the application context in order
to read a value in the GlobalNamingResources?
Thanks again,
Miguel Vieira
> Miguel,
>
>
>
> I'm assuming you want to access the values as defined for a given
> parameter in your server.xml or in your web.xml files depending on
> whether you want them defined globally or per application.
>
>
>
> Try the folling code in your jsp file and replace the parameter name
> with the appropriate one.
>
>
>
> <<BEGIN CODE SNIPET>>
>
> String my_var = "";
>
> try
>
> {
>
> InitialContext initCtx = new InitialContext();
>
> if(initCtx == null) throw new Exception("Boom - No Context");
>
> //Context envContext = (Context) initialContext.lookup
> ("java:comp/env");
>
> Context envCtx =
> (Context)initCtx.lookup("java:comp/env");
>
> my_var = (String)
> envCtx.lookup("my_parameter_name");
>
> }
>
> catch(Exception e)
>
> {
>
> out.println(e.getMessage());
>
> e.printStackTrace();
>
> }
>
> <<END CODE SNIPET>>
>
>
>
> /JM
>
>
>
>> -----Original Message-----
>> From: Miguel Vieira [mailto:[EMAIL PROTECTED]
>> Sent: 25 September 2003 12:35
>> To: [EMAIL PROTECTED]
>> Subject: Accessing GlobalNamingResources
>>
>>
>>
>> Hi,
>>
>>
>>
>> I'm using Tomcat 4.1.19 and I'd like to know if it's possible to
>> access
>>
>> the GlobalNamingResources, defined in server.xml, from a servlet,
>>
>> without creating a ResourceLink in the servlet's context?
>>
>>
>>
>> Thanks,
>>
>> Miguel Vieira
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