Asciidoclet fails with "invalid flag error" on Java 10

When I try to run the current Asciidoclet 1.5.5-SNAPSHOT with Java 10 via the Gradle javadoc task I get the following error:

javadoc: error - invalid flag: -d

This is because the old “Standard Doclet” was removed in Java 10 (http://www.oracle.com/technetwork/java/javase/10-relnote-issues-4108729.html#JDK-8177511) and Asciidoclet runs as a preprocessor that in-turn calls the Standard Doclet.

I’m not sure if this is worth trying to fix separately from Issue #71. In other words there are two approaches to resolving this:

1. Create an Asciidoclet that implements the new JavaDoc API and have this new Asciidoclet call the new standard doclet for generating HTML. i.e. Issue #71
2. Update the current Asciidoclet to use the new Standard Doclet w/o Asciidoclet itself implementing the new JavaDoc API. (I don’t even know if this is possible)

So, it seems to me like #71 is probably the best solution. But there may be other solutions and we need to track this specific issue that we are seeing under Java 10+.

[johncarl81]

Agreed, we should just move to the new API as you state in option 1 - option 2 is working in the wrong direction.

[chrisvest]

I’m also running into this on Java 11. Specifically I’m seeing that the -author flag is invalid.