My Oracle Support Banner

Attempting to Alter Constrained Candidate Servers Throws Error "The preferred server of MigratableTargetMBean MS1 (migratable) is not in the set of explicitly specified candidate servers (ConstrainedCandidateServers)" (Doc ID 2662079.1)

Last updated on AUGUST 23, 2021

Applies to:

Oracle WebLogic Server - Version 10.3.1 to
Information in this document applies to any platform.


 The setup of the Cluster is as follows
Managed Servers: MS1, MS2, and MS3 in the cluster named cluster1.

When creating the Servers that are part of the Cluster, Migratable Targets are automatically created.

Migratable Target 1 Name: MS1(migratable) hosting JTA1 and JMS1 Services, Current Hosting Server: MS1, User-Preferred Server: MS1, Candidate Server: MS1, MS2, M3
Migratable Target 2 Name: MS2(migratable) hosting JTA2 and JMS2 Services, Current Hosting Server: MS2, User-Preferred Server: MS2, Candidate Server: MS1, MS2, M3
Migratable Target 3 Name: MS3(migratable) hosting JTA3 and JMS3 Services, Current Hosting Server: MS3, User-Preferred Server: MS3, Candidate Server: MS1, MS2, M3

For each Migratable Targets, the User Preferred Server is the Managed Server where currently migratable services(JTA, JMS, or User-defined Singleton Services) is currently running. Example for when Managed Server MS1 has created a Migratable target with the name 'MS1 (migratable)' will be created and points to User Preferred Server as MS1.



In Short, the 'User Preferred Server' and the 'Current Hosting Server' are the serves where currently services are running.
We can add any/all Managed Servers that are part of the Cluster in the Candidate Servers list.



When attempting to remove the 'User Preferred Server' from the 'Chosen Constraint Candidate Servers' list, the following error occurs


To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.