Data source needs to be specified in context.xml instead of web.xml - why?

Hi,
I'm using a Spring JndiObjectFactoryBean to create my JNDI data source in my code:
<bean id="jndiDataSource" class="org.springframework.jndi.JndiObjectFactoryBean" lazy-init="true">
          <property name="jndiName" value="java:comp/env/jdbc/DS_OURDB_DB2" />
          <property name="lookupOnStartup" value="false"/>
          <property name="proxyInterface" value="javax.sql.DataSource"/>
     </bean>I have the necessary Resource added to my Tomcat's server.xml:
<Resource accessToUnderlyingConnectionAllowed="false"
            defaultAutoCommit="true" defaultReadOnly="false"
            driverClassName="com.ibm.db2.jcc.DB2Driver"
            factory="org.apache.tomcat.dbcp.dbcp.BasicDataSourceFactory"
            initialSize="0" logAbandoned="false" maxActive="8"
            maxIdle="8" maxOpenPreparedStatements="0" maxWait="-1"
            minEvictableIdleTimeMillis="1800000" minIdle="0"
            name="jdbc/DS_OURDB_DB2" numTestsPerEvictionRun="3"
            password="ourpass" poolPreparedStatements="false"
            removeAbandoned="false" removeAbandonedTimeout="300"
            testOnBorrow="true" testOnReturn="false"
            testWhileIdle="false" timeBetweenEvictionRunsMillis="-1"
            type="javax.sql.DataSource"
            url="jdbc:db2://machine1:60056/DBD1" username="ouruser"
               validationQuery="SELECT current date FROM sysibm.sysdummy1"/>I then have the resource referenced in my web.xml:
<resource-ref>
          <res-ref-name>jdbc/DS_OURDB_DB2</res-ref-name>
          <res-type>javax.sql.DataSource</res-type>
          <res-auth>Container</res-auth>
          <res-sharing-scope>Shareable</res-sharing-scope>
     </resource-ref>However, I'm getting JndiLookupFailureExceptions when I attempt to use this JNDI resource.
I can resolve it by specifying the following in my META-INF/context.xml:
<Context>
     <ResourceLink global="jdbc/DS_OURDB_DB2" name="jdbc/DS_OURDB_DB2" type="javax.sql.Datasource"/>
</Context>I've read some of the JNDI/Tomcat documentation. However, I still do not understand why it doesn't work with the web.xml. Can anyone explain please? Thanks

Can answer this myself after some more investigation. The reason I required the entry in the META-INF/context.xml was because I had specified the Resource as a Global Reference in the server.xml. By adding this Resource to my application's Context in the server.xml the configuration in the web.xml worked as expected.

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You should login to my oracle support to look into this ID.
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Hi
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Data source needs to be specified in context.xml instead of web.xml - why?

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