Deploying multiple versions of an enterprise application

hi,
trying to find a solution to deploy several versions of an enterprise
application i came up with the following considerations. i would highly
appreciate feedback on which method would be feasable and the issues
involved.
o version specific jndi names
creating a separate deployment descriptor for each version of the
enterprise application and binding each ejb to a different jndi name.
utilize jndi enc mappings to keep the application code unaffected.
the following deployment descriptor excerpt shows the relevant parts of
the weblogic-ejb-jar.xml for "versions01". each further version would
have different jndi names and jndi enc mappings.
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>SomeEJB</ejb-name>
<local-jndi-name>version01/SomeHomeLocal</local-jndi-name> <!--
version specific -->
</weblogic-enterprise-bean>
<weblogic-enterprise-bean>
<ejb-name>AnotherEJB<ejb-name>
<reference-descriptor>
<ejb-ref-name>ejb/SomeHomeLocal</ejb-ref-name>
<jndi-name>version01/SomeHomeLocal</jndi-name> <!-- version
specific -->
</reference-descriptor>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
is it possible to deploy the same classes with different jndi names? are
there any issues concerning the internal handling of weblogic
(classloading, classpath, ...)? can multiple versions be deployed from
the same source directory structure (hence is weblogic creating it's own
copy of class files during deployment by copying them into the domain
configuration directory)?
o multiple managed servers
configuring multiple managed servers and deploying each version of the
enterprise application to it's own server instance.
o built in support
does bea weblogic server provide some built in version support that
allows the deployment of multiple versions of the same enterprise
application within a single server instance? are there any deployment
tools that help to generate version specific deployment descriptors?
thanks in advance
best regards
erich liebmann

hi,
trying to find a solution to deploy several versions of an enterprise
application i came up with the following considerations. i would highly
appreciate feedback on which method would be feasable and the issues
involved.
o version specific jndi names
creating a separate deployment descriptor for each version of the
enterprise application and binding each ejb to a different jndi name.
utilize jndi enc mappings to keep the application code unaffected.
the following deployment descriptor excerpt shows the relevant parts of
the weblogic-ejb-jar.xml for "versions01". each further version would
have different jndi names and jndi enc mappings.
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>SomeEJB</ejb-name>
<local-jndi-name>version01/SomeHomeLocal</local-jndi-name> <!--
version specific -->
</weblogic-enterprise-bean>
<weblogic-enterprise-bean>
<ejb-name>AnotherEJB<ejb-name>
<reference-descriptor>
<ejb-ref-name>ejb/SomeHomeLocal</ejb-ref-name>
<jndi-name>version01/SomeHomeLocal</jndi-name> <!-- version
specific -->
</reference-descriptor>
</weblogic-enterprise-bean>
</weblogic-ejb-jar>
is it possible to deploy the same classes with different jndi names? are
there any issues concerning the internal handling of weblogic
(classloading, classpath, ...)? can multiple versions be deployed from
the same source directory structure (hence is weblogic creating it's own
copy of class files during deployment by copying them into the domain
configuration directory)?
o multiple managed servers
configuring multiple managed servers and deploying each version of the
enterprise application to it's own server instance.
o built in support
does bea weblogic server provide some built in version support that
allows the deployment of multiple versions of the same enterprise
application within a single server instance? are there any deployment
tools that help to generate version specific deployment descriptors?
thanks in advance
best regards
erich liebmann

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