This error shows with the latest .drl additions.   Apache velocity fails parsing which seems to be a bug that the archetype generation plugin hits.

[ERROR] Failed to execute goal org.apache.maven.plugins:maven-archetype-plugin:3.0.1:generate (default-cli) on project standalone-pom: org.apache.maven.archetype.exception.ArchetypeGenerationFailure: Error merging velocity templates: Encountered ");\n retract(" at archetype-resources/src/main/resources/_closedLoopControlName_.drl[line 526, column 59]
[ERROR] Was expecting one of:
[ERROR] "[" ...
[ERROR] "," ...
[ERROR] ")" ...
[ERROR] <WHITESPACE> ...
[ERROR] -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal org.apache.maven.plugins:maven-archetype-plugin:3.0.1:generate (default-cli) on project standalone-pom: org.apache.maven.archetype.exception.ArchetypeGenerationFailure: Error merging velocity templates: Encountered ");\n retract(" at archetype-resources/src/main/resources/_closedLoopControlName_.drl[line 526, column 59]