Caused by: java.lang.NullPointerException: Cannot invoke "java.util.Map.get(Object)" because "customAttributes" is null

[moritzschmitz-oviva]

Current Behavior

I am receiving this error Caused by: java.lang.NullPointerException: Cannot invoke "java.util.Map.get(Object)" because "customAttributes" is null when trying to import a realm config via keycloak-config-cli.

Error message:

Caused by: java.lang.NullPointerException: Cannot invoke "java.util.Map.get(Object)" because "customAttributes" is null
  at de.adorsys.keycloak.config.service.checksum.ChecksumService.hasToBeUpdated(ChecksumService.java:64)
  at de.adorsys.keycloak.config.service.RealmImportService.updateRealmIfNecessary(RealmImportService.java:151)
  at de.adorsys.keycloak.config.service.RealmImportService.doImport(RealmImportService.java:144)
  at de.adorsys.keycloak.config.KeycloakConfigRunner.run(KeycloakConfigRunner.java:79)
  at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:768)
  ... 13 common frames omitted

Expected Behavior

Well, I was hoping at least for a more meaningful error message.

Steps To Reproduce

Get files from: https://gist.github.com/moritzschmitz-oviva/4b629a0cd88ef1962bde54ca57c64c83.

mkdir tmp
wget https://gist.github.com/moritzschmitz-oviva/4b629a0cd88ef1962bde54ca57c64c83/archive/964cfb4ea0dc3b449390a87b2eeb71992e04bf4d.zip
unzip 964cfb4ea0dc3b449390a87b2eeb71992e04bf4d.zip -d tmp
rm 964cfb4ea0dc3b449390a87b2eeb71992e04bf4d.zip
cd tmp/4b629a0cd88ef1962bde54ca57c64c83-964cfb4ea0dc3b449390a87b2eeb71992e04bf4d
mkdir -p before
mv before-some-realm.json before/some-realm.json
mkdir -p changes
mv changes-some-realm.json changes/some-realm.json
docker compose up kcc

Without using my setup, it should be reproducible like this as well:

1. Import {"id":"test","realm":"test","attributes":{}} to Keycloak via kc.sh import.
2. Import {"id":"test","realm":"test","displayName":"just-a-name"} to Keycloak via keycloak-config-cli.

Environment

• Keycloak Version: 23.0.7
• keycloak-config-cli Version: 5.12.0-23.0.7

Anything else?

My goal is to migrate an existing Keycloak installation to using keycloak-config-cli. To ensure I am not changing more or less than what we need I import the current realm config into a local instance, apply config via keycloak-config-cli and then export it again to check for unexpected differences.