So my understanding is that because this file is found in META-INF/services, the JDK interprets its contents as being a service class name provider, which is it not. We have quite a few files in there which are "Groovy services" but nothing related to "Java services":
META-INF/services/javax.script.ScriptEngineFactory: references the JSR 223 class name. Service in the JDK semantics. META-INF/services/org.apache.groovy.plugin.GroovyRunner : not quite sure why it's there, seems rather new to me, and references a real class (TestNgRunner) META-INF/services/org.codehaus.groovy.runtime.ExtensionModule : Groovy's extension module file. Doesn't reference services but it's more a properties file referencing other class names META-INF/services/org.codehaus.groovy.source.Extensions : possible Groovy compiler extension file names listed here. Not a service. META-INF/services/org.codehaus.groovy.transform.ASTTransformation : a list of class names, which are not JDK services either. So I have no clue why the JDK needs to read all those files and make sure the service classes exist. But it would be a breaking change to move those files somewhere else. 2017-12-03 19:01 GMT+01:00 Cédric Champeau <cedric.champ...@gmail.com>: > This file is used by Groovy internally, there's no reason for the JDK to > interpret its contents since it has only a meaning for Groovy. In short, it > declares the list of extensions recognized by the Groovy compiler. That it > prevents loading as a module is rather strange. > > 2017-12-03 16:37 GMT+01:00 Ceki Gulcu <c...@qos.ch>: > >> Hi all, >> >> Referring to a discussion on the maven users list [1], it appears that >> removing the file META-INF/services/org.codehaus.groovy.source.Extensions >> from groovy-2.4.13.jar allows Java 9 to successfully load groovy-2.4.13.jar >> as an auto-module. >> >> The org.codehaus.groovy.source.Extensions file contains the lone word >> "groovy" instead of a fully qualified class name. >> >> Please advise. >> >> Best regards, >> >> -- >> Ceki Gülcü >> >> [1] http://markmail.org/message/obdyvuv24kqpxm6v >> > >
