non-reproducible jaxb2 generated files

[hboutemy]

need to investigate if it is a problem to be solved by a Maven plugin (there are multiple?) or jaxb implementation (there are multiple?)

some documentation on reducing issues by configuration have already been provided: https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/doc/BUILDSPEC.md#avoiding-timestamps-in-jaxb-generated-content

let's start by listing concrete cases:
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/com/io7m/certusine/com.io7m.certusine-2.0.0.diffoscope
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/com/io7m/idstore/com.io7m.idstore-0.0.14.diffoscope
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/com/io7m/sunburst/com.io7m.sunburst-0.0.6.diffoscope
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/com/io7m/chione/com.io7m.chione-0.0.2.diffoscope
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/santuario/xmlsec/xmlsec-3.0.1.diffoscope
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/santuario/xmlsec/xmlsec-4.0.1.diffoscope
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/activemq/activemq-parent-5.17.0.diffoscope
https://github.com/jvm-repo-rebuild/reproducible-central/blob/master/content/org/apache/nifi/nifi/nifi-1.19.0.diffoscope

[hboutemy]

found 2 cases in diffoscope files listed with timestamp in generated comment:

This file was generated by the Eclipse Implementation of JAXB, v3.0.0
See https://eclipse-ee4j.github.io/jaxb-ri 

and

This file was generated by the JavaTM Architecture for XML Binding(JAXB) Reference Implementation, v2.3.2 
See <a href="https://javaee.github.io/jaxb-v2/">https://javaee.github.io/jaxb-v2/</a> 

still need to check what Maven Plugin was using what jaxb implementation, and how it was calling it

[hboutemy]

FTR, Apache Santuario xmlsec looks like a good small project to study https://github.com/apache/santuario-xml-security-java/blob/main/pom.xml
teh project has integrated workarounds to be reproducible like apache/santuario-xml-security-java#248 , but there are multiple origins of issues at jaxb level to fix instead of a project needing to add RB workarounds in their build