Since issue #112 is closed I'll open another one here for this problem.
[ERROR] Failed to execute goal org.eluder.coveralls:coveralls-maven-plugin:4.3.0:report (default-cli) on project solid: Execution default-cli of goal org.eluder.coveralls:coveralls-maven-plugin:4.3.0:report failed: A required class was missing while executing org.eluder.coveralls:coveralls-maven-plugin:4.3.0:report: javax/xml/bind/DatatypeConverter
Since issue #112 is closed I'll open another one here for this problem.
Adding jaxb-api dependency is a workaround.