Task asciidoctor fails when having more than one backend

[mariogarcia]

Description

When configuring multiple backends ./gradlew ascii fails even though executing asciiEpub, asciiPdf separately works.

Screenshot

Source code

The build.gradle looks like this:

plugins {
    id 'org.asciidoctor.jvm.pdf' version '2.0.0'
    id 'org.asciidoctor.jvm.epub' version '2.0.0'
    id 'org.asciidoctor.jvm.convert' version '2.0.0'
}

repositories {
    jcenter()
    mavenCentral()
}

asciidoctorEpub {
    ebookFormats = [EPUB3]

    sourceDir = 'src/docs/asciidoc'
    sources {
        include 'index.adoc'
    }
}

asciidoctorPdf {
    sourceDir = 'src/docs/asciidoc'
    sources {
        include 'index.adoc'
    }
}

asciidoctor {
    sourceDir = 'src/docs/asciidoc'

    outputOptions {
        backends = ['html5', 'pdf', 'epub'] // <--- ArrayIndexOutOfBoundsException
    }

    sources {
        include 'index.adoc'
    }
}

Anyway you can find the whole project here: https://github.com/mariogarcia/asciidoctor-gradle-samples/tree/master/multiple-backends

Versions

• Gradle: 5.0
• JDK: 8.0.191-oracle

[jagedn]

maybe related with #282

I tried with

outputOptions{
   backends = ['html5', 'epub']
}

and it works

Also I tried to include the epub dependency as suggested in issue 282 using

configurations {
    asciidoctorExt
}
dependencies {
    asciidoctorExt 'org.asciidoctor:asciidoctorj-epub3:1.5.0-alpha.8.1'
}
asciidoctor{     
     ....
     configurations 'asciidoctorExt'
}

but error persists

[ysb33r]

backends = ['html5', 'pdf', 'epub']

@mariogarcia I'll have a look to see what the cause of the ArrayIndexOutOfBoundsException is.

Besides that: It is recommended to use the asciidoctorEpub task instead. If you plan to use the epub backend directly on the generic asciidoctor task it is you responsibility to place the epub artifact on the classpath. The correct way for that is to do

asciidoctor {
  asciidoctorj {
      epubVersion = '1.5.0-alpha.8.1'
  }
}

Do not use the configurations property for that. In addition the epub plugin will ensure that kindlegen is available when using the KF8 eBookFormat.

@jagedn Please note that #282 is related to 1.5.x and not applicable in this case.

[ysb33r]

@mariogarcia You accidentally found a bug that is not really related to your usage. If there are more than two backends specified and there are no additional GEMs, then it causes the ArrayIndexOutOfBoundsException.

I'll fix that and then close this issue and the correct usage have been addressed in https://github.com/asciidoctor/asciidoctor-gradle-plugin/issues?q=is%3Aopen+is%3Aissue+label%3A2.0.x#issuecomment-479826956.

[mariogarcia]

Understood @ysb33r 👍