In case when debug level for class org.wildfly.security.auth.realm.ldap.SimpleDirContextFactoryBuilder is enabled and value of any property from properties used for creating DirContext is array, then its value is not logged correctly, example:

Property [java.naming.security.credentials] with Value [[C@1bf1b7d5]

See https://github.com/wildfly-security/wildfly-elytron/blob/7b5c89c437d27fec60ec441986b5f830bb111283/src/main/java/org/wildfly/security/auth/realm/ldap/SimpleDirContextFactoryBuilder.java#L320