Commits by Jesse Glick were pushed to jglick/jigsawmaven
102cd8e - Added multijmodarchetype.
59c3b6d - Make sure module IDs are identifiers.
bcdd090 - Add semicolon to directives.
fb73b03 - File.mkdirs fails if the dir already exists.
4ff30fb - Playing with artifact handles to ensure the *.jar is the primary artifact and is installed with that extension.
2774f01 - Ignoring build products.
83bd987 - May need an empty package structure. TBD if archetype plugin can avoid this.
93f1c90 - Sketch of jmod plugin generating module-info.java.