...

OpenJPA Release Policy

...

Release Numbering

The release number consists of three digits separated by decimal points, followed by an optional status e.g. 2.1.6-beta2. The first digit is the major release number; the second is the minor release number; the third is the patch number. The optional status is an indicator of the release status, e.g. -alpha2, -rc1, etc. Generally, the status indicator is only used for major releases, e.g. 1.0.0-rc1 but is available for any release at the release manager's discretion.

...