MicroProfile Config integration plugin for the Camunda Platform

Note: This plugin is a prototype to showcase an integration with the MicroProfile Config specification. It provides an uber jar, where the smallrye-config-core, smallrye-config-source-yaml, and jgit dependencies are included. The plugin currently works with the Camunda Platform Tomcat distro.

This plugin adds support for MicroProfile Config for the Camunda Platform, i.e., it loads a ProcessEngineConfiguration instance with properties provided by a MicroProfile ConfigSource.

This plugin uses the SmallRye Config implementation of the MicroProfile Config specification.

How to use it

Depending on your project setup you can define a configuration file on your classpath, in your file system, or on an external system (accessible through a URL, e.g.: a Git config repo).

Note: if using a Git config repo, it should be public.

The properties should be defined under the camunda.config prefix.

There is also a special cambpm_conf_path property that defines a configuration file URL. It should only be defined as a system property, or environment variable.

The plugin should be added in your bpm-platform.xml (yes, you still need to do this, it's a process engine plugin):

<bpm-platform>
  ...
  <process-engine name="...">
    ...
    <plugins>
      ...
      <!-- plugin enabling microprofile config support -->
      <plugin>
        <class>org.camunda.config.CamundaMicroprofileConfigPlugin</class>
        <properties>
          <!-- you don't have to set this property, if you define the `cambpm_conf_path`
               as a system property, or environment variable -->
          <property name="configFilePath">https://github.com/koevskinikola/cambpm-test-config.git</property>
        </properties>
      </plugin>
    </plugins>
  </process-engine>
</bpm-platform>

The plugin provides support for the following ConfigSources:

1. GitConfigSource|PropertiesConfigSource|YamlConfigSource for a provided file URL.
2. YamlConfigSource for classpath:/application.yaml
3. PropertiesConfigSource for classpath:/application.properties
4. PropertiesConfigSource for META-INF/microprofile-config.properties
5. SysPropConfigSource - system property config source.
6. EnvConfigSource - environment variable config source.

You can have multiple configuration files. However, the properties defined in config sources with a higher priority will override the ones in lower priority config sources. The list above is ordered by descending priority.