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Message-ID: <b88f20380809030642x3bff290el3a1e087a74e838c2@mail.gmail.com>
Date: Wed, 3 Sep 2008 14:42:24 +0100
From: "Paul Pepper" <sip.sniffa@gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>
Subject: Re: Problem with JNDI environment entry resources
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	 <BLU142-W2424E5488CB52C468A361FAE5E0@phx.gbl>
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Martin,

Thanks for the suggestion, though I think there may have been some
misunderstanding. I'm attempting to access a simple java.lang.String,
not a DataSource. <Environment/> elements are used to place String
resources in an application's environment, not <Resource/> elements,
AFAIK.

Paul.

2008/9/3 Martin Gainty <mgainty@hotmail.com>:
>
> http://tomcat.apache.org/tomcat-5.5-doc/jndi-datasource-examples-howto.html<BR>
> /WEB-INF/web.xml contents which contain a jndi reference <BR><web-app xmlns="http://java.sun.com/xml/ns/j2ee"<BR>
>    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"<BR>
>    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee<BR>
> http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"<BR>
>    version="2.4"><BR>
>  <description>MySQL Test App</description><BR>
>  <resource-ref><BR>
>      <description>DB Connection</description><BR>
>      <res-ref-name>teststring</res-ref-name><BR>
>      <res-type>javax.sql.DataSource</res-type><BR>
>      <res-auth>Container</res-auth><BR>
>  </resource-ref><BR>
> </web-app><BR>
>
> the lookup to teststring will get you a connection to the DB<BR>
>
> HTH<BR>
> Martin<BR>
> ______________________________________________
> Disclaimer and confidentiality note
> Everything in this e-mail and any attachments relates to the official business of Sender. This transmission is of a confidential nature and Sender does not endorse distribution to any party other than intended recipient. Sender does not necessarily endorse content contained within this transmission.
>
>
>> Date: Wed, 3 Sep 2008 01:01:40 +0100
>> From: sip.sniffa@gmail.com
>> To: users@tomcat.apache.org
>> Subject: Problem with JNDI environment entry resources
>>
>> Tomcat 6.0.18
>> java version "1.6.0_06" (sun-java6-jdk on Ubuntu 8.04 i386)
>>
>> I'm attempting to create environment entry resources, of type
>> java.lang.String, within conf/server.xml and access them from web
>> applications using JNDI. I've created a bare-bones test web app,
>> jndistring, with the following conf/server.xml configuration:
>>
>> server.xml (snipped):
>> -----------------------------
>>       <Host name="localhost"
>>             appBase="webapps"
>>             unpackWARs="true"
>>             autoDeploy="false"
>>             deployOnStarup="true"
>>             xmlValidation="false"
>>             xmlNamespaceAware="false">
>>
>>             <Context docBase="jndistring.war"
>>                     path="jndistring"
>>                     useNaming="true">
>>
>>                 <Environment name="teststring"
>>                     value="a test value"
>>                     type="java.lang.String"
>>                     override="false"
>>                 />
>>             </Context>
>>
>>       </Host>
>>
>> For the purpose of this test I've used jsp to access the value of teststring.
>>
>> jndistring.jsp (snipped):
>> --------------------------------
>> <%
>> Context initCtx = new InitialContext();
>> Context envCtx = (Context) initCtx.lookup("java:comp/env");
>>
>> String teststring = (String) envCtx.lookup("teststring");
>> out.println("teststring: " + teststring);
>> %>
>>
>> Accessing this page throws an exception:
>> org.apache.jasper.JasperException: An exception occurred processing
>> JSP page /test.jsp at line 18
>> 15: Context initCtx = new InitialContext();
>> 16: Context envCtx = (Context) initCtx.lookup("java:comp/env");
>> 17:
>> 18: String teststring = (String) envCtx.lookup("teststring");
>> 19: out.println("teststring: " + teststring);
>> 20: %>
>>
>> The top frame of the root cause is shown as:
>> javax.servlet.ServletException: javax.naming.NameNotFoundException:
>> Name teststring is not bound in this Context
>>
>> If I attempt to create an environment entry resource using
>> <env-entry/> (and sub-elements) within web.xml, then the resource is
>> created and I can access it!!!
>>
>> I've read the "JNDI resources howto", docs regarding the <Host/>,
>> <Context/> and <Environment/> elements (and others), but don't see
>> that I have missed anything.
>>
>> Can anyone suggest what I might have missed? Has anyone else had
>> similar problems?
>>
>> Thanks,
>>
>> Paul.
>>
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