This are files with META informations about the modules. In later versions they are not longer created.
But if you have problems with 20MB disc space you might run into other problems as JBoss might create other files, i.e. log or tmp files for deployments, which might use more disc space
Thanks for the reply... Could you suggest me a suitable version that I can use to avoid this space accupation. I need to deploy EJB2.1.
That index files should not take more than less then 1KB per module.
unless you have enormous amount of modules this should not be the 200mb size increase issue you are seeing.
that .index files are there to speed up classloading....