How to use java.util.Optional with Dropwizard and JDBI

In order to use Java 8’s java.util.Optional together with Dropwizard and JDBI, first include the Java 8 build of JDBI module:

In pom.xml (use version corresponding with Dropwizard):

io.dropwizard.modules dropwizard-java8-jdbi 0.7.1-1

In the main application, make sure that you import the correct DBIFactory from the module:

import io.dropwizard.java8.jdbi.DBIFactory;