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Created attachment 153491 [details] error message Configuring WildFly 9.0.0 CR1 in NetBeans 8.0.1 is not supported. It shows the error message shown in the attachment.
This is a warning as you are changing the wildfly installation directory. But since you didn't update the configuration file you are still using the old one (from 8.2.0 I assume).
I tried adding a new server, not change an existing server. What needs to be done to get this working OOTB?
Could you try with the nightly build ?
I was not able to reproduce this issue. Will file another bug if it comes back again.
Incorrect detection of WildFly 9 and 10