This is also common at my workplace, with the resolution always being to
delete the empty file and try again. We haven't nailed down a
reproducible way to cause it, but it does seem to happen more often when
network conditions are flaky. I agree that deleting the file would be a
user-friendly thing for Maven to do automatically, assuming only one Maven
process is operating on the repository at once (which I think Maven already
assumes).
On Fri, Feb 18, 2022 at 7:03 AM Mantas Gridinas <mgridi...@gmail.com> wrote:
> Even empty jars that were produced by maven would contain
> META-INF/maven.{groupid}.{artifactid}/pom.* files, wouldn't they? Looking
> at ZipFile.java such error is thrown when the file is truly empty, and
> doesnt contain the zip metadata (ZipFile.java:1409 as per adopt openjdk
> sources).
>
> On Fri, Feb 18, 2022, 14:57 Jacques Etienne Beaudet <jebeau...@gmail.com>
> wrote:
>
> > Maven repository is not safe when running multiple concurrent builds (not
> > the -T1C option). You need to use an external synchronization technique
> if
> > you need this.
> >
> https://maven.apache.org/resolver/maven-resolver-named-locks-redisson/index.html
> >
> > Not sure of the implications of assuming an empty zip file means a failed
> > download, it seems reasonable to me but I'll let others chip in.
> > On Feb 18, 2022, 7:43 AM -0500, Nils Breunese <n...@breun.nl>, wrote:
> > > Hi,
> > >
> > > I’ve been encountering Maven warnings like these for years from time to
> > time:
> > >
> > > ----
> > > WARN: zip file is empty:
> >
> /Users/username/.m2/repository/com/example/example-artifact/1.2.3/example-artifact-1.2.3.jar
> > > java.util.zip.ZipException: zip file is empty
> > > ----
> > >
> > > I know that when I encounter this I can just delete the file and run
> > Maven again and then it’ll generally download ok, but recently I’ve been
> > getting questions from a lot of colleagues with this issue. I was
> > wondering: would it make sense for Maven to assume that an empty JAR file
> > was not downloaded correctly and try re-downloading it automatically?
> > >
> > > Nils.
> >
>
