Service Provider Interface (SPI) to define configuration.

Provides an interface to allow custom implementations to define key/value configuration entries.

This allows a Service Loader to pick configuration from remote sources.

The custom configuration service provider has to implement the interface ConfigurationProvider. The dependency library can be found here

Add the dependency to your project.

Maven example:

<dependency>
    <groupId>com.signavio.workflow</groupId>
    <artifactId>config-provider</artifactId>
    <version>1.0.2</version>
</dependency>

Create a class that implements ConfigurationProvider and overrides the method Map<String, String> get().

src/main/java/com/signavio/workflow/config/ExampleConfigProvider.java

public class ExampleConfigProvider implements ConfigurationProvider {

  @Override
  public Map<String, String> get() {
    return Collections.unmodifiableMap(
        new HashMap<String, String>() {{
          put("effektif.mongodb.password", "test_password");
          put("key", "value");
        }});
  }
}

The service provider has to include a file under META-INF/services. The file name should be the fully qualified service name without any extension. Inside the file the provider has to specify the fully qualified implementation.

src/main/resources/META-INF/services/com.signavio.workflow.config.ConfigurationProvider

com.signavio.workflow.config.ExampleConfigProvider

The generated implementation has to be packed as a jar file and copied under $TOMCAT_HOME/webapps/ROOT/lib directory.

After that, the application has to be restarted in order for the new configuration service to be applied.