Codegen fails against vertx 3.3.1 and 3.3.2

[DanielJoyce]

See eclipse-vertx/vertx-codegen#88

Confirmed it works for vertx-lang-js 3.3.2, so there is some subtle problem with the gradle build.

[DanielJoyce]

Yeah, its something weird with the classpath.

[DanielJoyce]

It appears to be trying to load classes from the source jars?

When I comment out

    vertx group: 'io.vertx', name: 'vertx-core', version: vertxVersion, classifier: 'sources'

then

./gradlew clean typeDefinitionsZip

works, but no sources are of course generated for vertx-js ( core )

[DanielJoyce]

I think its related to this

https://bugs.openjdk.java.net/browse/JDK-8151191

I can confirm that the codegen phase is also building the source and not just processing it, so it seems the -proc:only flag is passed in wrong.

[DanielJoyce]

eclipse-vertx/vertx-codegen#88

Actually its the interaction of gradle with this jdk bug https://bugs.openjdk.java.net/browse/JDK-8151565

[DanielJoyce]

Starting to get it working. Cleaning up then issuing a pull request.

[DanielJoyce]

Pull request #11