How can I configure the SpringSource Tool Suite(ver 2.3.0) Spring project to accept .aj (AspectJ) file?
Currently it does not recognize .aj file.
And I cannot add *.aj file because it's a Spring project, not an AspectJ project.
Spring project can be an AspectJ project at the same time.
To configure your project as AspectJ right-click your project in Eclipse, select Configure/Convert To AspectJ project.
Additionally you can enable Spring Aspect Tooling by selecting Spring Tools/Enable Spring Aspect Tooling