1. Introduction

Unity version 2.x features major changes and requires some effort to perform upgrade from a 1.x version. This document tracks all actions that may be necessary during upgrade.

The only supported update is from the 1.9.x version. Updating directly from 1.8.x can work but we neither test nor support such update path. Update from any older version to 2.0.x version won’t work for sure. If you have older version, update it to the latest 1.9.x version first.

This document doesn’t provide information on the reasons for the introduced changes - see 2.0.0 release notes.

2. Update highlights

In general update from 1.9 to 2.0 should be pretty smooth, unless you used any of those advanced features:

  1. Developed a custom Java initializer of Unity contents

  2. Integrated with the Unity REST admin API

  3. Developed a custom extension/plugin/…​ for Unity

In the above cases the upgrade will require you to refactor your code. Some hints are presented below, do not hesitate to contact us for support.

3. General update procedure

To perform major import update is is necessary to export data from the 1.9.x version to JSON format from Admin UI and then to import it into the newer version. Automatic upgrade of database is not possible.

Unity 2 includes couple of incompatible changes in configuration. Those changes are not difficult to perform and shouldn’t take a lot of time, however are mandatory. Details of all changes are provided in the next section.

Therefore the suggested update procedure is as follows:

  1. Install a new instance separately (can be even on a separate test machine)

  2. Configure a new instance by reusing the old configuration, applying the mandatory updates as described in the next section. If installing on a test machine make sure to also update hostname. Always make sure to use a separate database.

  3. Start the new server and verify if the configuration is correct and server is properly starting.

  4. Create JSON dump of the old server (AdminUI → Server management → Database backup).

  5. Import the JSON dump in the new server. Any additional tests can be performed now.

  6. Assuming everything worked properly the old server can be shutdown, and the new server can replace it.

If there are any problems during import please let us know.

4. Configuration files changes

4.1. Logging subsystem re-configuration

Unity 1.x used a dated log4j 1.2.17 logging library. Unity 2.x upgrades it to the most recent log4j2. Log4j2 uses a different configuration syntax. It is important to note that logging configuration file name is changed from log4j.properties to:


It is strongly suggested to use a new logging configuration file from Unity distribution as a template and apply all local modifications manually to it. Typically it is only required to update logger levels to desired ones.

Note that basic concepts behind logging (loggers, appenders) did not change. It is also possible to use other formats supported by Log4j2 (as new properties format), however we suggest to stick with the default XML configuration: it is quite concise and there is the largest base of examples in XML syntax.

4.2. Database subsystem re-configuration

Unity 1.x allows for using only one of supported relational databases (RDBMS) to persist service state. What is more two databases where used: the regular one, and so called local database, which was a helper store.

Unity 2.0 drops the local database - its configuration is now removed.

Unity 2.0 allows for different database backends. Therefore the RDBMS backend which formerly was the only (implicite) possibility, now is one of supported options. Below we assume that RDBMS backend should be still used in 2.0. In case other backend is more appropriate please refer to the regular manual.

The following configuration changes are required in unityServer.conf:

  1. The property unityServer.db.localDBUrl should be removed

  2. A new property needs to be added: unityServer.storage.engine=rdbms

  3. All properties in unityServer.conf starting with unityServer.db. should be changed to start with the prefix unityServer.storage.engine.rdbms.

Example for MySQL database:


MySQL & MariaDB require the REFERENCES grant to the unity database user. If this grant is missing please add it. The full grant statement for example DB user can be:

 SELECT, TRIGGER, UPDATE, REFERENCES ON unitydb.* to 'unity'@'localhost' IDENTIFIED BY 'unitypass';+

4.3. Initialization scripts re-configuration

Unity 1.x used the following configuration to activate so called contents initializers:


Couple of such contents initializers were shipped with Unity and allowed for quick-starting with (typically example) data.

Unity 2 deprecates this feature, however it is still supported so that custom extensions can be loaded this way. We plan to fully drop this feature later on.

Instead a much more powerful mechanism is provided: Unity can launch Groovy scripts in effect of various system generated events. There are events triggered during server startup and so content initialization can be easily done using this new feature (along with many other things). All previously hardcoded content initializers from Unity 1 are now available as Groovy scripts and so can be also modified.

The following configuration snippet turns on all initializers that were available in Unity 1 in the new, script style. Only the desired ones can be used. Note however that the new defaultContentInitializer.groovy is required to be added for nearly all cases, and it is strongly suggested to always have it activated. For details please check general documentation of the scripts triggering feature as well as the script itself.

If a custom initialization code was developed and used in Unity 1.x it must be rewritten to use the new API. We suggest to convert it to Groovy, for easier maintenance.

To update custom initializers it is the best to first refactor them to compile and run in the legacy mode in Unity 2. Then moving them to Groovy is typically very easy, as syntax is mostly the same, only some small modifications are required. Typically it is enough to:

  1. removing main class

  2. removing the run() method with @Override annotation

5. REST API changes

If Unity clients were using the REST API please note that the JSON objects used as parameters in few cases have changed. The paths, methods, parameter names were not changed.

The list of changes:

  1. Identity object format.

  2. Entity object format.

  3. Attribute object format: no more visibility element, changes in some of value syntaxes (email).

  4. Member’s object format is more rich when getting groups contents.

  5. Attribute type object format.

  6. Endpoint object format

6. Suggested post update actions

Unity 2 uses a much more secure password storage format. Server is configured in the way that passwords stored with the legacy method are not forced to be updated. However this is strongly suggested. To do so visit the Schema Management tab in AdminUI, select Credentials management. Open in edit mode each of your password credentials and deselect checkbox "Accept legacy storage format". Then all users with legacy password will be forced to change it after next login.