All,
Since the introduction of multi-part upload support in Servlet 3 (Tomcat
7), Tomcat has used a package renamed fork of Commons FileUpload to
provide that support.
Recently, FileUpload has undergone some major refactoring for 2.x to
modularise it to support different versions of the Servlet
specification, primarily Java EE vs Jakarta EE. As part of that, the
minimum Java version for 2.x is Java 11.
The code Tomcat is currently based on is now the essentially 1.x branch.
This was created from the 1.4 release so Tomcat currently has a few
changes that were not applied to that branch. The minimum Java version
for this branch is Java 6.
I have spent the last couple of hours looking at updating Tomcat 11.0.x
to the 2.x FileUpload code. It is doable, but we'll need to bring in
most of Commons IO as well which is about another 500k.
Given the minimum Java version requirements, Tomcat 8.5.x and 9.0.x will
need to remain based on FileUpload 1.x.
Tomcat 10.1.x and Tomcat 11.0.x could opt to remain based on FileUpload
1.x or switch to 2.x.
We need to decide what to do.
Since we have little choice for Tomcat 8.5.x and 9.0.x, I will be
aligning these branches with FileUpload 1.x first.
I'm not a huge fan of pulling a large chunk of Commons IO or on making
sufficient changes to our fork so we don't have to. I am therefore
currently planning on aligning 10.1.x and 11.0.x with FileUpload 1.x as
well.
I do intend to see if there are changes from FileUpload 2.x that are
worth cherry-picking into Tomcat (and FileUpload 1.x) if minimum Java
versions permit.
All that said, the Jakarta EE Migration tool already includes a package
renamed copy of Commons IO (as well as Lang and Compress) so there might
be something we co do there - maybe a new Commons forks JAR?
Thoughts?
Mark
PS I'm going to start with 8.5.x (and then 9.0.x) now as I don't think
we have much choice with those two.
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