[keycloak-user] import not working in 1.8

[Tim Dudgeon]

I've hit an issue with import. The command I used to use to import a 
realm with 1.7.0 now gives an error with 1.8.1, but from reading the 
docs all the options seem to be valid. Could someone point to what has 
changed?

The command I'm using is

/opt/jboss/keycloak/bin/standalone.sh -b 0.0.0.0 
-Dkeycloak.migration.action=import 
-Dkeycloak.migration.provider=singleFile 
-Dkeycloak.migration.file=/tmp/json/yyy.json 
-Dkeycloak.migration.strategy=OVERWRITE_EXISTING

Or to be more correct, I'm doing this in Docker, and it can be 
reproduced like this:

docker run -it --rm -v $PWD:/tmp/json jboss/keycloak:1.8.1.Final 
/opt/jboss/keycloak/bin/standalone.sh -b 0.0.0.0 
-Dkeycloak.migration.action=import 
-Dkeycloak.migration.provider=singleFile 
-Dkeycloak.migration.file=/tmp/json/yyy.json 
-Dkeycloak.migration.strategy=OVERWRITE_EXISTING

which tells me that I've specified an invalid option. It works fine if I 
use the 1.7.0.Final image.

Tim