SUCCESS: You must right-click your project and choose Refresh. Your project must use a Java 11 JRE. To complete IntelliJ IDEA setup, you must manually configure File | Project Structure | Project | Project SDK. You won't have to do this in the future if you define property $${idea.jdk}, e.g. in ~/lucene.build.properties, ~/build.properties or lucene/build.properties, with a value consisting of the following two XML attributes/values (adjust values according to JDKs you have defined locally - see File | Project Structure | Platform Settings | SDKs): idea.jdk = project-jdk-name="11" project-jdk-type="JavaSDK" Clover not enabled! You can find the merged Lucene/Solr Clover report in '${clover.report.dir}'. java version "${java.version}" ${java.runtime.name} (${java.runtime.version}, ${java.vendor}) ${java.vm.name} (${java.vm.version}, ${java.vm.vendor}) Test args: [${args}]