A Config provides access to the application's configuration. It may have been automatically discovered, or manually created and registered.

The default usage is to use getConfig() to automatically pick up the configuration for the current thread's context class loader.

A configuration consists of information collected from the registered configuration sources, combined with the set of registered converters. The configuration sources get sorted according to their ordinal value. Thus it is possible to override a lower-priority configuration source with a higher-priority one.

It is also possible to register custom configuration sources to flexibly extend the configuration mechanism. For example, a configuration source could be provided which reads configuration values from a database table.

Example:

 String restUrl = ConfigProvider.getConfig().getValue("myproject.some.remote.service.url", String.class);
 Integer port = ConfigProvider.getConfig().getValue("myproject.some.remote.service.port", Integer.class);
 

For more advanced use cases (e.g. registering a manually created Config instance), please see ConfigProviderResolver.registerConfig(Config, ClassLoader) and ConfigProviderResolver.getBuilder().