Do resource links not work with UserTransaction (TC 5.0.16)?

[Robert Krüger]

Hi,

either I fail to understand the general concept or there is something 
strange with resource links in TC 5.0.16.

Everything works as documented with ResourceLink entries with 
DataSources and other global resources I configured. However, when I try 
configuring a Resource of type javax.transaction.UserTransaction I have 
to configure it for each context/webapp because when I configure it as a 
global resource and just put a resource link in the context, the lookup 
in the web application fails.

Example1 (simplified): does not work, lookup fails 
("javax.naming.NamingException: Cannot create resource instance")

<Server>
  <GlobalNamingResources>
    <Resource name="UserTransaction" auth="Container" 
type="javax.transaction.UserTransaction"/>
    <ResourceParams name="UserTransaction">
      <parameter>
        <name>factory</name>
        <value>com.signal7.tyrex.UserTransactionFactory</value>
      </parameter>
    </ResourceParams>
  </GlobalNamingResources>
  <Service>
    <Engine>
      <Host>
        <Context>
          <ResourceLink name="UserTransaction" global="UserTransaction" 
type="javax.transaction.UserTransaction"/>
        </Context>
      </Host>
    </Engine>
  </Service>

</Server>

Example2 (simplified): works

<Server>
  <GlobalNamingResources>
  </GlobalNamingResources>
  <Service>
    <Engine>
      <Host>
        <Context>
          <Resource name="UserTransaction" auth="Container" 
type="javax.transaction.UserTransaction"/>
          <ResourceParams name="UserTransaction">
            <parameter>
              <name>factory</name>
              <value>com.signal7.tyrex.UserTransactionFactory</value>
            </parameter>
          </ResourceParams>
        </Context>
      </Host>
    </Engine>
  </Service>

</Server>

It looks as if UserTransaction is treated in a special way. Is that 
intentional and obvious and I'm just missing it? BTW, I tried this with 
the JOTM JTA implementation and it behaved exactly the same way.

Thanks in advance,

Robert

--
________________________
Robert Krüger
Signal7 GmbH
Brüder Knauss Str. 79
64285 Darmstadt
Germany
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