fix: use C-compatible types in @JavaImplementation macro for C++ interop

- Update ImplementsJavaMacro to generate CJNIEnv instead of JNIEnv
  to ensure compatibility with C++ interoperability mode
- Update JNIAsyncTests LegacyFuture test expectations to use
  C-compatible types (CJNIEnv, Cjobject)

See: #391

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: NakaokaRei

.github/workflows/pull_request.yml

@@ -202,6 +202,7 @@ jobs:
       image: ${{ (contains(matrix.swift_version, 'nightly') && 'swiftlang/swift') || 'swift' }}:${{ matrix.swift_version }}-${{ matrix.os_version }}
     env:
       CXX_INTEROP: '1'
+      SWIFT_JAVA_VERBOSE: true
     steps:
       - uses: actions/checkout@v4
       - name: Prepare CI Environment
@@ -229,6 +230,7 @@ jobs:
         ]
     env:
       CXX_INTEROP: '1'
+      SWIFT_JAVA_VERBOSE: true
     steps:
       - uses: actions/checkout@v4
       - name: Prepare CI Environment

Sources/SwiftJavaMacros/ImplementsJavaMacro.swift

@@ -77,9 +77,11 @@ extension JavaImplementationMacro: PeerMacro {
       }
 
       // Map the parameters.
+      // Use CJNIEnv for C++ interoperability compatibility.
+      // See: https://github.com/swiftlang/swift-java/issues/391
       let cParameters: [FunctionParameterSyntax] =
         [
-          "environment: UnsafeMutablePointer<JNIEnv?>!",
+          "environment: UnsafeMutablePointer<CJNIEnv?>!",
           isStatic ? "thisClass: jclass" : "thisObj: jobject",
         ]
         + parametersClause.parameters.map { param in

Tests/JExtractSwiftTests/JNI/JNIAsyncTests.swift

@@ -457,12 +457,12 @@ struct JNIAsyncTests {
       expectedChunks: [
         """
         @_cdecl("Java_com_example_swift_SwiftModule__00024async__JLorg_swift_swiftkit_core_SimpleCompletableFuture_2")
-        func Java_com_example_swift_SwiftModule__00024async__JLorg_swift_swiftkit_core_SimpleCompletableFuture_2(environment: UnsafeMutablePointer<JNIEnv?>!, thisClass: jclass, c: jlong, result_future: jobject?) {
+        func Java_com_example_swift_SwiftModule__00024async__JLorg_swift_swiftkit_core_SimpleCompletableFuture_2(environment: UnsafeMutablePointer<CJNIEnv?>!, thisClass: jclass, c: jlong, result_future: Cjobject?) {
           ...
           var task: Task<Void, Never>? = nil
           ...
           environment.interface.CallBooleanMethodA(environment, globalFuture, _JNIMethodIDCache.SimpleCompletableFuture.complete, [jvalue(l: boxedResult$)])
-          ... 
+          ...
         }
         """
       ]