Create a jekyll instance with plantuml plugin

[evantill]

Is your feature request related to a problem? Please describe.
Having an environment to reproduce errors using plantuml with jekyll

Describe the solution you'd like
A container with jekyll, plantuml and a jekyll-plantumlplugin.

Additional context
Example of usage : trying to reproduce the plantuml#1082.

[evantill]

Trying to use Jekyll 4.2.2 starting with jekyll/jekyll as the base image

• Bootstraping the new container component.
• Installing plantuml inside it.
• Testing to create a simple blog instance.
• Adding some plantuml diagram.

[evantill]

Trying to run jekyll new blog hit this error:

bash-5.1# jekyll new blog3
ruby 3.1.1p18 (2022-02-18 revision 53f5fc4236) [x86_64-linux-musl]
/usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/html.rb:10:in `require': cannot load such file -- rexml/parsers/baseparser (LoadError)
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/html.rb:10:in `<top (required)>'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown/html.rb:10:in `require'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown/html.rb:10:in `<top (required)>'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown/paragraph.rb:14:in `require'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown/paragraph.rb:14:in `<top (required)>'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown.rb:345:in `require'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown.rb:345:in `<class:Kramdown>'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown.rb:60:in `<module:Parser>'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown.rb:19:in `<module:Kramdown>'
	from /usr/gem/gems/kramdown-1.17.0/lib/kramdown/parser/kramdown.rb:17:in `<top (required)>'
	from /usr/gem/gems/jekyll-3.8.7/lib/jekyll/converters/smartypants.rb:3:in `require'
	from /usr/gem/gems/jekyll-3.8.7/lib/jekyll/converters/smartypants.rb:3:in `<top (required)>'
	from /usr/gem/gems/jekyll-3.8.7/lib/jekyll.rb:13:in `require'
	from /usr/gem/gems/jekyll-3.8.7/lib/jekyll.rb:13:in `block in require_all'
	from /usr/gem/gems/jekyll-3.8.7/lib/jekyll.rb:12:in `each'
	from /usr/gem/gems/jekyll-3.8.7/lib/jekyll.rb:12:in `require_all'
	from /usr/gem/gems/jekyll-3.8.7/lib/jekyll.rb:194:in `<top (required)>'
	from /usr/gem/gems/jekyll-3.8.7/exe/jekyll:8:in `require'
	from /usr/gem/gems/jekyll-3.8.7/exe/jekyll:8:in `<top (required)>'
	from /usr/local/bundle/bin/jekyll:27:in `load'
	from /usr/local/bundle/bin/jekyll:27:in `<main>'

[evantill]

asciidoctor/kramdown-asciidoc#84

[evantill]

Also facing this issue : Jekyll serve fails on Ruby 3.0 #8523

Using the provided workaround (bundle add webrick) solved this problem.

[evantill]

Trying to downgrade to jekyll 3.8

running plantuml --version throw a NPE:

bash-5.0# java -version
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (IcedTea 3.12.0) (Alpine 8.212.04-r1)
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)
bash-5.0# plantuml
Exception in thread "main" java.lang.NullPointerException
	at sun.awt.FontConfiguration.getVersion(FontConfiguration.java:1264)
	at sun.awt.FontConfiguration.readFontConfigFile(FontConfiguration.java:219)
	at sun.awt.FontConfiguration.init(FontConfiguration.java:107)
	at sun.awt.X11FontManager.createFontConfiguration(X11FontManager.java:774)
	at sun.font.SunFontManager$2.run(SunFontManager.java:431)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.font.SunFontManager.<init>(SunFontManager.java:376)
	at sun.awt.FcFontManager.<init>(FcFontManager.java:35)
	at sun.awt.X11FontManager.<init>(X11FontManager.java:57)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
	at java.lang.Class.newInstance(Class.java:442)
	at sun.font.FontManagerFactory$1.run(FontManagerFactory.java:83)
	at java.security.AccessController.doPrivileged(Native Method)
	at sun.font.FontManagerFactory.getInstance(FontManagerFactory.java:74)
	at sun.font.SunFontManager.getInstance(SunFontManager.java:250)
	at sun.font.FontDesignMetrics.getMetrics(FontDesignMetrics.java:264)
	at sun.java2d.SunGraphics2D.getFontMetrics(SunGraphics2D.java:864)
	at net.sourceforge.plantuml.Run.forceOpenJdkResourceLoad(Run.java:250)
	at net.sourceforge.plantuml.Run.main(Run.java:154)

AdoptOpenJDK/openjdk-docker#75
workaround docker-library/openjdk@0f82de1

# see https://bugs.debian.org/793210
# and https://github.com/docker-library/java/issues/46#issuecomment-119026586
RUN apt-get update && apt-get install -y --no-install-recommends libfontconfig1 && rm -rf /var/lib/apt/lists/*

[evantill]

First release of a jekyll container with plantuml installed :
https://github.com/plantuml/docker/pkgs/container/docker%2Fjekyll

Next step is to test plantuml usage in the container

[evantill]

closed by #29