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This is the format given by the Eclipse legal doc generator [1].
[1] https://www.eclipse.org/projects/tools/documentation.php?id=technology.jgit
Bug: 548298
Change-Id: I8d8cabc998ba1b083e3f0906a8d558d391ffb6c4
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
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Using TYPE_USE causes compilation errors in Eclipse Neon.3 (JDT 3.12.3)
and Eclipse Oxygen.2 (JDT 3.13.2).
This reverts commit 8e217517e2c515032dd0d661535d2133cd80123a.
This reverts commit 55eba8d0f55464ca84d676828f67a6fe14b2454d.
Reported-by: Thomas Wolf <thomas.wolf@paranor.ch>
Change-Id: I96869f80dd11ee238911706581b224bca4fb12cd
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
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Since JGit now requires Java 8, we can switch to TYPE_USE instead
of explicitly specifying the target type.
Some of the existing uses of Nullable need to be reworked slightly
as described in [1] to prevent the compilation error:
scoping construct cannot be annotated with type-use annotation
[1] https://stackoverflow.com/a/21385939/381622
Change-Id: Idba48f67a09353b5237685996ce828c8ca398168
Signed-off-by: David Pursehouse <david.pursehouse@gmail.com>
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Change-Id: I2761ea91f8dfed16ea54e7a6646af03a30c15ec9
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>
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JGit's Nullable type was added[1] in the hope of being able to add
nullness annotations that (a) do not preclude building and running
with Java 7 and (b) could be shared by Gerrit, which uses a custom
Nullable type for other reasons[2]. Sharing a type is useful because
Eclipse's null analysis is only able to use one Nullable type at a
time in a given workspace (so for this analysis to function in a
workspace used to develop Gerrit, JGit and Gerrit would need to use
the same Nullable type).
The new Nullable type has CLASS instead of RUNTIME retention because
there wasn't any obvious use for the annotation at run time.
Gerrit uses the Nullable annotation to communicate with Guice. Guice
injection happens at runtime, so it needs to be able to read the
@Nullable annotations at run time[3]. Otherwise Guice produces
provisioning errors, such as
3) null returned by binding at com.google.gerrit.lucene.LuceneChangeIndex$Factory.create()
but parameter 7 of com.google.gerrit.lucene.LuceneChangeIndex.<init>() is not @Nullable
Switch to RUNTIME retention to avoid this.
While at it, update the javadoc to explain more clearly how this
annotation relates to other Nullable types[4]. This should make it
clearer why JGit needed another Nullable type:
A. Avoiding dependency on Java 8
B. RUNTIME retention to allow Guice to read the annotation at run time
C. Named Nullable so Guice can recognize the annotation
D. Not an addition to Java EE's javax.annotation package, to avoid
the split-package problem[2] that prevents the annotation from
being readable at run time when loaded from an OSGi container
E. Avoiding heavyweight dependencies, deprecated dependencies, and
dependencies on package internals
org.checkerframework.checker.nullness.qual.Nullable: A
com.sun.istack.internal.Nullable: B, E
*.CheckForNull, *.NullAllowed, etc: C
edu.umd.cs.findbugs.annotations.Nullable: B, E
javax.annotation.Nullable: D
org.eclipse.jdt.annotation.Nullable: B
org.jetbrains.annotations.Nullable: B
org.jmlspecs.annotation.Nullable: E
android.annotation.Nullable, android.support.annotation.Nullable: E
[1] https://git.eclipse.org/r/59993
[2] https://gerrit-review.googlesource.com/50112
[3] https://github.com/google/guice/blob/master/core/src/com/google/inject/internal/Nullability.java
[4] https://github.com/typetools/checker-framework/blob/5832a01f1/checker/src/org/checkerframework/checker/nullness/NullnessAnnotatedTypeFactory.java#L118
http://types.cs.washington.edu/checker-framework/current/checker-framework-manual.html#nullness-related-work
Change-Id: I6c482653d2b53e3509abb11211b67fc29cf2949c
Signed-off-by: Jonathan Nieder <jrn@google.com>
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Other plugins which want to use JGit nullness annotations in their code
cannot do this if the annotations aren't part of the published API.
Unfortunately it looks like although Eclipse JDT allows to use custom
nullness annotation types per project, it does not understand if those
annotations are used mixed with other nullness annotations in other
projects. E.g. EGit can either configure JGit annotations for NPE
analysis and so "understand" nullness from JGit API but so it loses the
ability to use any other nullness annotations to annotate its own code.
Change-Id: Ieeeb578c2fe35223a7561d668dce8e767dc89ef0
Signed-off-by: Andrey Loskutov <loskutov@gmx.de>
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Commit 847b3d1 enabled annotation-based NPE analysis to JGit.
In so doing, it introduced a new dependency on the org.eclipse.jdt that
is undesirable. Follow Gerrit's lead by adding an internal Nullable type
(see
https://gerrit.googlesource.com/gerrit/+/stable-2.11/gerrit-common/src/main/java/com/google/gerrit/common/Nullable.java).
The javax.annotations.Nullable class uses a retention policy of RUNTIME,
whereas the org.eclipse.jdt.annotation.Nullable class used a policy of
CLASS. Since I'm not aware of tools that make use of the annotation at
runtime I chose the CLASS policy. If in the future there is a benefit to
retaining the annotations in the running binary we can update this
class.
Change-Id: I63dc8f9a6dc46b517cbde211bb5e2f8521a54d04
Signed-off-by: Terry Parker <tparker@google.com>
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