Opened Issue: https://github.com/apache/cloudstack/issues/3826
We noticed that on mysql-connector-java version 8.0.19 (not sure about other 8.0.x versions) we have errors such as the following: Caused by: java.lang.IllegalArgumentException: Can not set long field com.cloud.upgrade.dao.VersionVO.id to java.math.BigInteger at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:167) at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:171) at sun.reflect.UnsafeLongFieldAccessorImpl.set(UnsafeLongFieldAccessorImpl.java:102) Looks like in code we are using Long with Auto Increment fields, but the DB columns are actually BigInt. Downgrading to the EPEL release of mysql-connector-java (5.1.25-3) fixed the issue. However, I expect lots of people would hit this, because in the upgrade guides we specify to add the mysql-community repo - which uses newer mysql-connectors: http://docs.cloudstack.apache.org/projects/archived-cloudstack-release-notes/en/4.11/upgrade/upgrade-4.9.html Thanks Sean