swiftlang/swift-java

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Java interopability support for Swift

Stars: 1.2k
Forks: 123
Open beginner issues: 0
Indexed issues: 132
Avg merge: 1d 7h
Merged PRs (30d): 16

Dominant language: Swift
License: Apache-2.0
Last GitHub push: Sep 16, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Beginner friendly Everything

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132 open issues indexed

SwiftJavaExtract sample apps fail to build on Windows Open

Difficulty 4/5 3-5 days Newbie friendliness 55/100

swiftlang/swift-java#920 · Opened Sep 19, 2026
jextract accepts an empty javaPackage and emits invalid Java source in JNI and FFM modes Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

swiftlang/swift-java#919 · Opened Sep 16, 2026
jextract: Preserve underlying exception when async closure completes exceptionally Open

Difficulty 3/5 1-2 days Newbie friendliness 65/100

swiftlang/swift-java#915 · Opened Sep 7, 2026
Compilation error for class with sync/async function overloads: method is already defined Open

Difficulty 3/5 1-2 days Newbie friendliness 68/100

swiftlang/swift-java#906 · 1 comment · Opened Aug 31, 2026
Compilation error for default protocol function implementation: "invalid redeclaration of..." Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

swiftlang/swift-java#891 · 1 comment · Opened Aug 18, 2026
Compilation error for generic NSObject: Required init Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

swiftlang/swift-java#885 · Opened Aug 17, 2026
jextract: support Swift prefix and postfix operators Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#867 · Opened Aug 7, 2026
JNI global state and JNI_OnLoad assume a single copy of the runtime per process — statically-linked-per-module embedders (Skip Fuse) end up with N copies and a nil JNI.jni Open

android

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-java#854 · 3 comments · Opened Jul 30, 2026
jextract: Support typed UnsafeMutablePointers etc Open

feature:jextract

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#840 · Opened Jul 13, 2026
jextract: Handle _Concurrency.Task better Open

feature:jextract

Difficulty 5/5 Over a week Newbie friendliness 35/100

swiftlang/swift-java#839 · Opened Jul 13, 2026
jextract: make sure and formalize we handle overloads properly Open

feature:jextract

Difficulty 3/5 1-2 days Newbie friendliness 52/100

swiftlang/swift-java#838 · Opened Jul 13, 2026
jextract: Support SIMPLE parameter packs Open

feature:jextract

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-java#836 · Opened Jul 13, 2026
jextract: Support async closures Open

feature:jextract

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-java#834 · Opened Jul 13, 2026
jextract: Support throwing closures Open

Difficulty 3/5 1-2 days Newbie friendliness 52/100

swiftlang/swift-java#833 · Opened Jul 13, 2026
jextract: closures with @Sendable should keep this information in generated java "closure" type Open

bug feature:jextract

Difficulty 3/5 1-2 days Newbie friendliness 55/100

swiftlang/swift-java#832 · 1 comment · Opened Jul 13, 2026
Better support for `Error` type in JNI mode. Open

feature:jextract

Difficulty 5/5 Over a week Newbie friendliness 45/100

swiftlang/swift-java#826 · Opened Jul 10, 2026
jextract closure support should not specialize () -> () and () -> T shapes, and just use Runnable and Supplier Open

feature:jextract

Difficulty 3/5 1-2 days Newbie friendliness 48/100

swiftlang/swift-java#811 · 2 comments · Opened Jul 1, 2026
Support specialization for generic enums Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

swiftlang/swift-java#793 · Opened Jun 18, 2026
wrap-java: malformed where clause for static methods on nested types of generic interfaces Open

bug feature:wrap-java

Difficulty 3/5 1-2 days Newbie friendliness 48/100

swiftlang/swift-java#783 · Opened Jun 10, 2026
Compiling an unrelated executable compiles StaticBuildConfigPluginExecutable Open

build

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-java#776 · 1 comment · Opened May 31, 2026
Support tuple returns from dictionaries Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

swiftlang/swift-java#753 · Opened May 15, 2026
JNI async thunk generates empty jvalue(l: ) for generic result Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

swiftlang/swift-java#752 · Opened May 14, 2026
Trim the CI jobs a bit -- too many variants Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

swiftlang/swift-java#747 · Opened May 14, 2026
Introduce SwiftExtract module, with reusable analysis parts Open

swiftlang/swift-java#743 · 1 assignee · Opened May 13, 2026
jextract: Support Foundation.Decimal Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-java#711 · 2 comments · Opened Apr 16, 2026
JNIExtract can't handle type-name/module-name conflicts Open

feature:jextract

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#706 · 2 comments · Opened Apr 16, 2026
Building a package for Apple platform shouldn't use JExtractSwiftPlugin plugin and swift-java dependency at all Open

Difficulty 3/5 1-2 days Newbie friendliness 48/100

swiftlang/swift-java#694 · 1 comment · 5 reactions · Opened Apr 10, 2026
Docs/guide about debugging crashes for java developers Open

documentation

Difficulty 3/5 1-2 days Newbie friendliness 52/100

swiftlang/swift-java#683 · Opened Apr 7, 2026
Attempt to remove non-JNI local reference errors on Android Open

android

Difficulty 2/5 1-3 hours Newbie friendliness 75/100

swiftlang/swift-java#663 · 4 comments · 1 reaction · Opened Apr 1, 2026
Generate version script file for FFM mode in jextract Open

Difficulty 3/5 1-2 days Newbie friendliness 58/100

swiftlang/swift-java#653 · Opened Mar 28, 2026
Move Foundation support into a common package Open

Difficulty 4/5 3-5 days Newbie friendliness 50/100

swiftlang/swift-java#638 · Opened Mar 23, 2026
Switch wrap java to JEP467 markdown docs style Open

Difficulty 4/5 3-5 days Newbie friendliness 30/100

swiftlang/swift-java#637 · Opened Mar 21, 2026
Add CI job that checks/regenerates JavaStdlib etc with wrap-java Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-java#628 · 3 comments · Opened Mar 18, 2026
jextract/ffm: Support native Swift Set use from Java Open

feature:jextract mode:ffm

Difficulty 5/5 Over a week Newbie friendliness 35/100

swiftlang/swift-java#611 · Opened Mar 11, 2026
jextract/ffm: Support native Swift Dictionary use from Java Open

feature:jextract mode:ffm

Difficulty 5/5 Over a week Newbie friendliness 25/100

swiftlang/swift-java#610 · Opened Mar 11, 2026
Android Runtime CI & 32 bit CI Open

android build github_actions help wanted

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#608 · 7 comments · Opened Mar 11, 2026
Protocols with default methods in extension fail to compile Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

swiftlang/swift-java#562 · 1 comment · Opened Feb 13, 2026
Can I wrap a Java library to use in Swift if the package comes from an external Maven repository or even a local package? Open

feature:resolve

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#551 · 1 comment · Opened Feb 3, 2026
Undefined symbol: _JNI_CreateJavaVM & _JNI_GetCreatedJavaVMs during building Xcode project Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

swiftlang/swift-java#550 · 2 comments · Opened Feb 3, 2026
swift-java cannot bridge members generated by macros Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

swiftlang/swift-java#547 · 4 comments · Opened Feb 2, 2026
Idiomatic way of catching multiple exceptions from Java in Swift Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-java#545 · Opened Jan 29, 2026
wrap-java: Circular references with javaparser-core-3.28.0.jar Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

swiftlang/swift-java#541 · 3 comments · Opened Jan 23, 2026
Properties that rely on type inference are not exported into Java Open

feature:jextract

Difficulty 4/5 3-5 days Newbie friendliness 38/100

swiftlang/swift-java#539 · 2 comments · Opened Jan 22, 2026
Code in conditional compilation branches is not exported Open

feature:jextract

Difficulty 3/5 1-2 days Newbie friendliness 45/100

swiftlang/swift-java#538 · 1 comment · Opened Jan 22, 2026
Translating Foundation types requires explicit Foundation import Open

feature:jextract

Difficulty 4/5 3-5 days Newbie friendliness 48/100

swiftlang/swift-java#536 · Opened Jan 22, 2026
Property in Protocol extension with a Self constraint can produce uncompilable bridge Open

feature:jextract

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#534 · 1 comment · Opened Jan 21, 2026
Classes with a type parameter fail to compile Open

feature:jextract

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#533 · 3 comments · 1 reaction · Opened Jan 21, 2026
The act workflow suggested in the contribution guide doesn't work well Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#532 · 1 comment · Opened Jan 21, 2026
Conforming to Equatable generates uncompilable Swift code Open

feature:jextract mode:ffm mode:jni

Difficulty 3/5 1-2 days Newbie friendliness 45/100

swiftlang/swift-java#531 · 2 comments · Opened Jan 21, 2026
System.loadLibrary uses the module name instead of the library (product) name Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

swiftlang/swift-java#521 · 1 comment · Opened Jan 15, 2026

swiftlang/swift-java

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