Freeplane 1.9.x package challenges (looking for co-maintainer(s))

[Felix Natter <fnatter@gmx.net>]

hello Java maintainers,

I consider upgrading freeplane from 1.7.10 to 1.9.x. Unfortunately,
there are quite a few challanges (some might not be valid and some
might be missing):

- gradle 6.x (7.x?) -> that's why I haven't started yet. I realize you
  are working hard on this.
- redo patches for gradle build system
- additional/new dependencies:
  - twemoji (unicode emojis): dependency twemoji-parser which depends on a twitter scala library
    (2-3 teams involved) -> see the lengthy discussion @ #878875 plus links
  - knopflerfish 8.0.4->8.0.11 -> _might_ need to update libknopflerfish-osgi-framework-java
  - org.freeplane.dpolivaev.mnemonicsetter:mnemonicsetter 0.5->0.6 (easy)
  - com.github.robtimus:data-url: 1.0.1->2.0
  - com.bulenkov:darcula: 2018.2->2021.7
  - new: com.twelvemonkeys.imageio:imageio-jpeg:3.6.4
  - commons-io and commons-codec now pull an older version -> don't know why, maybe needs patches
  - org.freeplane.lightdev:simplyhtml: 0.17.3->0.18.5 (easy)
  - https://repo.spring.io/plugins-release: probably just debug helper
  - 'org.xbib.gradle.plugin.jflex' version '1.2.1' (downgraded??)
  - :jsyntaxpane-0.9.6~r156-7 -> https://github.com/Sciss/SyntaxPane (fork!)
  - new: io.github.gitbucket:markedj:1.0.16 (markdown)
  - jmapviewer:2.14->2.15
  - org.codehaus.groovy:groovy-all: 2.4->3.0.8 (fp might update to 4.x soon)
  - org.apache.ivy:ivy:2.4.0->org.apache.ivy:ivy:2.5.0
  - batik: 1.10->1.14 (1.12 is in Debian)
  - fop: 2.2->2.6 (2.5 is in Debian)
  - new: 'org.apache.pdfbox:fontbox:2.0.23'
  (moving target: new/updated dependencies all the time)
- OSGi: bnd invocation compatible (5.0.1->5.3.0)?
- new logos, licenses, ...
- does not work with Java >=16 currently (as of freeplane 1.9.7)
   (like many other packages I guess) -> will be fixed upstream

Is there anyone who would consider to join the freeplane packaging?
It is a popular package [1] (although its popularity has decreased because
the package is outdated), so I think it is quite nice to have it
updated in Debian -> you will have many grateful users :-)

[1] https://qa.debian.org/popcon.php?package=freeplane

Cheers and Best Regards,
Felix
--
Felix Natter