November 6, 2018 Product Developers Urban Malc
KumuluzEE MicroProfile Config configuration MicroProfile Eclipse MicroProfile

KumuluzEE MicroProfile Config 1.3.0 released

We’re releasing the KumuluzEE MicroProfile Config 1.3.0. This version implements the MicroProfile Config specification 1.3, which introduces a better implicit converter and removes redundant converters. This release also brings full support for Java 9+.

The implicit converter now also checks if the method of(String) exists. The order in which the methods are checked has also been changed. From the specification:

An implicit converter is automatically provided if the following conditions are met:

  • The target type T has a public static T of(String) method, or
  • The target type T has a public Constructor with a String parameter, or
  • The target type T has a public static T parse(CharSequence) method

Manual implementations of some converters that are now covered by the new implicit converter have been removed.

This release also brings support for the ConfigBuilder, which lets you create a custom Config instance composed of configuration sources and converters of your choosing.

Note that environment variable configuration source behavior has changed as of MicroProfile 1.3 specification. For a given property name, the configuration source now searches 3 environment variables:

  • Exact match.
  • Replace all characters that are not alphanumeric with _.
  • Replace all characters that are not alphanumeric with _ and convert to upper case.

We have already supported this change in KumuluzEE core with the release of 3.0.0. We have also made sure that backward compatibility is preserved so none of your existing configurations will break.


  • Added lookup for the method of(String) in implicit converter
  • Support for ConfigBuilder
  • Support for Java 9+


  • Fixed the order in which methods are checked in implicit converter

More details about this release can be found on GitHub.

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