The nightly compilation build with JDK 11 fails due to a possible bug in asciidoctor-maven-plugin version 1.5.7.1:
[ERROR] Failed to execute goal org.asciidoctor:asciidoctor-maven-plugin:1.5.7.1:process-asciidoc (generate-pdf) on project optaplanner-docs: Execution generate-pdf of goal org.asciidoctor:asciidoctor-maven-plugin:1.5.7.1:process-asciidoc failed: (LoadError) load error: jopenssl/load – java.lang.StringIndexOutOfBoundsException: begin 0, end 3, length 2 -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.asciidoctor:asciidoctor-maven-plugin:1.5.7.1:process-asciidoc (generate-pdf) on project optaplanner-docs: Execution generate-pdf of goal org.asciidoctor:asciidoctor-maven-plugin:1.5.7.1:process-asciidoc failed: (LoadError) load error: jopenssl/load – java.lang.StringIndexOutOfBoundsException: begin 0, end 3, length 2

Please see the attached stacktrace for complete error message.