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According to discussion in issue 42412 it is better to keep them in a project and not as file attributes. It means o.n.m.w.core.WebExecSupport.{s|g}etQueryString should be reimplemented.
We keep all file attrs in a one file now so too many information kept here can cause worse performance.
There is no adequate replacement for file attributes yet. If I moved file attributes to private.properties, I would miss the "refactoring" features : - file change - file delete - file copy - file move Using the "classical" way we can hold the additional information (related to file objects) even after these changes. We use the file attributes to store information about the URI string that are used for servlet execution. Web applications with huge number of servlets are very rare so I don't see the performance problem here.