Here goes project property settings for Eclipse projects
http://www.informit.com/articles/article.aspx?p=367962
Defines packaging structure, i.e. which folder in project structure packs into which path in deployment package.
Especially in a EAR project, use this to assemble jar, war from other projects by "Add -> Project". Before doing this, that project shall be referred by the EAR project
build path - this also defines project dependencies
can enforce dependency direction - for example, business module should not depend on UI
Order and Export - defines which libraries shall also be exported