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No way to annotate a package #3600

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scabug opened this issue Jun 24, 2010 · 8 comments
Open

No way to annotate a package #3600

scabug opened this issue Jun 24, 2010 · 8 comments
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annotations enhancement language spec
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@scabug
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scabug commented Jun 24, 2010

Scala does not have any way of placing annotations on a package.

In Java, package annotations are placed before the package statement in a Java source file named package-info.java. The compiler generates an interface named package-info and attaches those annotations to it. These annotations (if they have a retention policy of RUNTIME) can then be looked at with some methods on java.lang.Package.

See also: [http://java.sun.com/docs/books/jls/third_edition/html/packages.htmlSI-7.4.1.1 JLS 3rd Ed. � 7.4.1.1]

The most obvious syntax for this is to allow annotations on package objects. This might result in confusion, though, since package objects have their own, distinct class files.
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scabug commented Jun 24, 2010

Imported From: https://issues.scala-lang.org/browse/SI-3600?orig=1
Reporter: Alex Hvostov (argv)

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scabug commented Jun 28, 2011

Gabriel Rossetti (grossetti) said:
Yes, this would be nice

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scabug commented Dec 22, 2012

@paulp said:
A meta-annotation should be used to disambiguate between package and package object.

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scabug commented Nov 10, 2013

Nathan Stoddard (nstoddard) said:
This would be very nice to have for the @Strictfp annotation, especially for package objects.

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scabug commented Jan 21, 2014

@gzm0 said:
After discussion with Lukas Rytz, we are of the opinion that allowing annotations on package objects and requiring a java source file if (Java-)annotations on packages are required is sufficient.

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scabug commented Jan 21, 2014

@xeno-by said:
I would like to mention that loading Java-based package annotations via Scala reflection isn't implemented yet.

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scabug commented Jan 21, 2014

@gzm0 said:
Thanks for the info. This won't affect what we propose.

@scabug scabug added this to the 2.13.0-M1 milestone Apr 7, 2017
@adriaanm adriaanm modified the milestones: 2.13.0-M1, 2.13.0-M2 Apr 14, 2017
@szeiger szeiger modified the milestones: 2.13.0-M3, 2.13.0-M2 Jul 20, 2017
@adriaanm adriaanm modified the milestones: 2.13.0-M3, 2.13.0-M4 Jan 30, 2018
@lrytz lrytz removed this from the 2.13.0-M4 milestone Apr 23, 2018
@MasseGuillaume MasseGuillaume mentioned this issue Jul 1, 2018
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@som-snytt
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No one mentioned that this duplicates #3115 with possibly upping the ante on java interop.

@scala scala deleted a comment from scabug Mar 5, 2022
@SethTisue SethTisue added this to the Backlog milestone Mar 5, 2022
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