Using JDO in a portal component.

[Former Member]

Hi!

I've tried using JDO in a portal component (DynPage), but it just won't work for me (WAS 6.40).

What I've tried is this:

- Looking up a PersistenceManagerFactory using the name "java:comp/env/jdo/defaultPMF"

This does not work ... I get a NameNotFoundException: Path to object does not exist at java:comp, the whole lookup name is java:comp/env/jdo/defaultPMF

- After reading this forum I tried with the name "deployedAdapters/jdo/defaultPMF/shareable/jdo/defaultPMF" although this is probably not the correct way

This did return a PersistenceManagerFactory object, however I wasn't able to cast to the PersistenceManagerFactory interface that I had. It must have been different versions of the interface - I tried downloading the jdo.jar from Sun and compiling the portal component against that, but still the ClassCastException occured. I used the reflection API to determine that the object returned did in fact implement the interface named javax.jdo.PersistenceManagerFactory. I even tried using the jdo.jar libraries from the server, but to no luck.

So ... my question is: Is JDO not available from a portal component? Must I develop a J2EE application to make it work? If so, I'd rather use Hibernate in my portal components, but it seems stupid when JDO is available?

Thanks,

Thomas

[Former Member · Accepted solution]

Vladimir:

Thank you, I managed to get a PersistenceManagerFactory after adding this to my portalapp.xml:

<property name="PrivateSharingReference" value="SAPJ2EE::sap.com/com.sap.jdo"/>

Brandelik:

I don't understand your answer. After adding the entry above to my portalapp.xml, I'm still only able to get a PersistenceManagerFactory through the name "deployedAdapters/jdo/defaultPMF/shareable/jdo/defaultPMF".

Could you elaborate on how I should get it through "java:comp/env/jdo/defaultPMF", as this seems to be the right way to do it?

Thanks,

Thomas

[Vlado · Accepted solution]

Hi Thomas,

"java:comp/env/" is the standard JNDI environment context only for J2EE components. There's no such context in Portal components and the root lookup (i.e. what you did with "deployedAdapters/jdo/defaultPMF/shareable/jdo/defaultPMF") is the right and only way to do it. If you can cast the looked up object to PersistenceManagerFactory and work with it, then you're done

Hope that helps!

Vladimir

[Former Member · Accepted solution]

Hi Vladimir.

Okay, great! I'm no JNDI expert so I didn't quite understand the lookup string. Guess it confuses me that portal components don't have access to the "java:comp/env" context when servlets does (I haven't tried but theres an example in the docs). I thought the two were essentially the same but obviously I'm wrong.

Thanks for your help,

Thomas

[Vlado]

Hi Thomas,

In order to be able to use JDO in a Portal component, you have to add a Private Sharing Reference to the application sap.com/com.sap.jdo. This is a standard application provided with the SAP WebAS Java installation.

For more info on how to do that, please refer to <a href="https://www.sdn.sap.comhttp://www.sdn.sap.comhttp://www.sdn.sap.com/irj/servlet/prt/portal/prtroot/com.sap.km.cm.docs/library/ep/g-i/how%20to%20access%20an%20ejb%20from%20a%20portal%20component.mht">this</a> tutorial -> Accessing the EJB -> New Portal Component -> scroll to the section "Add PrivateSharingReference".

Hope that helps!

Vladimir

[Former Member]

The standard reference in your jndi is not

java:comp/env/....

You need to look at your app and create an environment reference like

env ref name= mypermgrfac

jndi name = defaultPMF

and then you can look it up with

"java:comp/env/mypermgrfac" but only within the declaring appl. scope.

Enjoy