Adding izpack plugin 5.0.9 is not enough to be able to compile an izpack project.
The build breaks with a message:
[ERROR] Failed to execute goal org.codehaus.izpack:izpack-maven-plugin:5.0.9:izpack (default) on project isort-install: Execution default of goal org.codehaus.izpack:izpack-maven-plugin:5.0.9:izpack failed: Plugin org.codehaus.izpack:izpack-maven-plugin:5.0.9 or one of its dependencies could not be resolved: The following artifacts could not be resolved: org.icepdf.os:icepdf-core:jar:6.0.1, org.icepdf.os:icepdf-viewer:jar:6.0.1: Could not find artifact org.icepdf.os:icepdf-core:jar:6.0.1 in central ...
It seems as the icepdf-core 6.0.1 and icepdf-viewer 6.0.1 packages do no longer exist in the maven repository. The earliest version that can be found is 6.1.2.
A work-around is to add dependencies to the 6.1.2 versions of the packages but this should really not be necessary in my oppinion.