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new 44e275590 Add -Yfuture-lazy-vals for Scala 3 builds (#1060)
44e275590 is described below
commit 44e2755900fe94bf7a477adf3b5d049d6765f746
Author: He-Pin(kerr) <[email protected]>
AuthorDate: Sat Jun 13 21:46:02 2026 +0800
Add -Yfuture-lazy-vals for Scala 3 builds (#1060)
* Add -Yfuture-lazy-vals for Scala 3 builds
Motivation:
The Scala 3.3.8 compiler introduced the -Yfuture-lazy-vals flag
(scala/scala3-lts#637) to optionally use VarHandle instead of
sun.misc.Unsafe for lazy val implementation. This prepares libraries
for upcoming JDK releases that restrict Unsafe access.
Modification:
Add -Yfuture-lazy-vals to Common.scala scalacOptions using the
existing onlyOnScala3 helper.
Result:
pekko-http's Scala 3 build uses the future-proof VarHandle-based lazy
val implementation, compatible with all JDK 9+ versions.
Tests:
- sbt "++3.3.8; http/compile" passed (exit 0, 66s)
References:
Refs scala/scala3-lts#637
* Add MiMa filters for Scala 3 <clinit> removals
Motivation:
The -Yfuture-lazy-vals flag added in 6d25f5ee8 changes the Scala 3
bytecode generated for object lazy vals. As a side effect, the synthetic
<clinit> static initializers on Directives, PathMatchers, and
PathDirectives are no longer emitted, causing MiMa to flag three
DirectMissingMethodProblem errors against the 1.0.0 baseline.
These are compiler-internal initialization methods, not part of the
public API, so the change is binary compatible in practice.
Modification:
Add a new mima-filters exclude file under
2.0.x.backwards.excludes/ to suppress the three <clinit> missing-method
warnings on the Scala 3 build.
Result:
sbt "++3.3.8; http/mimaReportBinaryIssues" and validatePullRequest
MiMa checks pass again.
References:
Refs apache/pekko-http#1060
* fix: merge onlyOnScala3 scalacOptions into a single Seq
Motivation:
Code review requested combining the two onlyOnScala3 calls into one.
Modification:
Merge "-Wconf:cat=deprecation:s" and "-Yfuture-lazy-vals" into a single
onlyOnScala3(Seq(...)) call.
Result:
Cleaner build definition with both Scala 3 options in one place.
Tests:
Not run - build config only
References:
Refs apache/pekko-http#1060
---
.../scala3-future-lazy-vals-clinit.excludes | 24 ++++++++++++++++++++++
project/Common.scala | 4 +++-
2 files changed, 27 insertions(+), 1 deletion(-)
diff --git
a/http/src/main/mima-filters/2.0.x.backwards.excludes/scala3-future-lazy-vals-clinit.excludes
b/http/src/main/mima-filters/2.0.x.backwards.excludes/scala3-future-lazy-vals-clinit.excludes
new file mode 100644
index 000000000..005b8a430
--- /dev/null
+++
b/http/src/main/mima-filters/2.0.x.backwards.excludes/scala3-future-lazy-vals-clinit.excludes
@@ -0,0 +1,24 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied. See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+# Scala 3's -Yfuture-lazy-vals flag changes the bytecode generated for object
+# lazy vals, removing the synthetic <clinit> methods present in the 1.0.0
+# baseline. These are compiler-internal initialization methods and are not
+# part of the public API, so the change is binary compatible in practice.
+ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.pekko.http.scaladsl.server.Directives.<clinit>")
+ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.pekko.http.scaladsl.server.PathMatchers.<clinit>")
+ProblemFilters.exclude[DirectMissingMethodProblem]("org.apache.pekko.http.scaladsl.server.directives.PathDirectives.<clinit>")
diff --git a/project/Common.scala b/project/Common.scala
index ce7270438..8558bc9fa 100644
--- a/project/Common.scala
+++ b/project/Common.scala
@@ -34,7 +34,9 @@ object Common extends AutoPlugin {
// In all other cases, the warning is non-actionable: you get spurious
warnings that need to be suppressed
// verbosely. So, opt out of those in general.
"-Wconf:cat=other-match-analysis&msg=match may not be
exhaustive:s")).value,
- scalacOptions ++= onlyOnScala3(Seq("-Wconf:cat=deprecation:s")).value,
+ scalacOptions ++= onlyOnScala3(Seq(
+ "-Wconf:cat=deprecation:s",
+ "-Yfuture-lazy-vals")).value,
javacOptions ++=
Seq("-encoding", "UTF-8", "--release", javacTarget),
mimaReportSignatureProblems := true,
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