AMQ 7.7 concurrent jolokia operations can incorrectly update artemis-roles.properties or artemis-users.properties

Previously, if multiple, concurrent Jolokia operations that manipulated users and roles or permissions took place on the broker, the broker might incorrectly update or remove some data in the `artemis-roles.properties` or `artemis-users.properties` configuration files. This issue is now resolved.

Example test: #!/bin/bash for i in {1..5} do # remove myuser curl -k --user admin:admin -H "Origin: http: //localhost:8161" "http://localhost:8161/console/jolokia/exec/org.apache.activemq.artemis:broker=%220.0.0.0%22/removeUser(java.lang. String )/myuser" & # create user 'myuser' with password 'mypassword' curl -k --user admin:admin -H "Origin: http: //localhost:8161" "http://localhost:8161/console/jolokia/exec/org.apache.activemq.artemis:broker=%220.0.0.0%22/addUser(java.lang. String ,java.lang. String ,java.lang. String , boolean )/myuser/mypassword// false " & # add role 'myrole' to 'myuser' curl -k --user admin:admin -H "Origin: http: //localhost:8161" "http://localhost:8161/console/jolokia/exec/org.apache.activemq.artemis:broker=%220.0.0.0%22/resetUser(java.lang. String ,java.lang. String ,java.lang. String )/myuser/mypassword/myrole" & # perform read operation as admin user, just to see if we can connect curl -k --user admin:admin -H "Origin: http: //localhost:8161" "http://localhost:8161/console/jolokia/exec/org.apache.activemq.artemis:broker=%220.0.0.0%22/listNetworkTopology()" & done After executing the above script (multiple times if necessary), sometimes the following logs will be encountered in the broker (note that the test does not remove/add admin): 2020-09-01 14:35:28,398 WARN [io.hawt.system.Authenticator] Login failed due to: User does not exist: admin Examination, in this case, of artemis-roles.properties shows: $ cat etc/artemis-roles.properties | grep -v '#' amq = admin = myuser But there are multiple variants that may occur.  The in-memory user data is likely affected as well, since the admin user is no longer able to authenticate at all.