Hi,

We are currently evaluating migrating from tWAS to liberty on Openshift (Cloud Pak for App), there are still some of the features that are not clearly defined on liberty : 

• Is it supported to use UDDI ?
• How Transaction Services are implemented in Liberty, I found that we can use database or shared filesystem (https://www.ibm.com/support/knowledgecenter/SSEQTP_liberty/com.ibm.websphere.wlp.doc/ae/twlp_admin_trans_service.html), but if we scale our instances on OpenShift does it still work this way ? 
• Session Replication : It's supported to use JCache for session persistance on liberty, are there any limitation compared to memory to memory replication in tWAS.

Thank you in advance.

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Largou walid
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Regarding to the Session Replication, the JCache for session persistence on liberty works pretty much same as the tWAS memory to memory replication.
That is, it has both Peer-to-Peer model and Client-Server model. For more details, please see
https://openliberty.io/blog/2018/03/22/distributed-in-memory-session-caching.html
I don't recall there is any limitation, other than Open Liberty does not ship a copy of Hazelcast. So you may have to download the hazelcast.jar.

Hope this helps,
Allan Zhang

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ALLAN ZHANG
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