Internal changes

dagger-compiler/main/java/dagger/internal/codegen/writing/FactoryGenerator.java

@@ -42,6 +42,7 @@
 import static dagger.internal.codegen.xprocessing.XElements.asMethod;
 import static dagger.internal.codegen.xprocessing.XElements.asTypeElement;
 import static dagger.internal.codegen.xprocessing.XFunSpecs.constructorBuilder;
+import static dagger.internal.codegen.xprocessing.XFunSpecs.getMethodReferenceName;
 import static dagger.internal.codegen.xprocessing.XFunSpecs.methodBuilder;
 import static dagger.internal.codegen.xprocessing.XTypeElements.typeVariableNames;
 import static dagger.internal.codegen.xprocessing.XTypeNames.factoryOf;
@@ -409,7 +410,8 @@ private XFunSpec staticProxyMethodForProvision(ProvisionBinding binding) {
     }
     XCodeBlock arguments =
         copyParameters(builder, parameterNameSet, method.getParameters(), compilerOptions);
-    XCodeBlock invocation = XCodeBlock.of("%L.%N(%L)", module, referenceName(method), arguments);
+    XCodeBlock invocation =
+        XCodeBlock.of("%L.%N(%L)", module, getMethodReferenceName(method), arguments);
 
     Nullability nullability = Nullability.of(method);
     return builder
@@ -419,24 +421,6 @@ private XFunSpec staticProxyMethodForProvision(ProvisionBinding binding) {
         .build();
   }
 
-  /**
-   * Returns the name that should be used to reference the given binding method.
-   *
-   * <p>To ensure we properly handle internal visibility, we handle the reference differently
-   * depending on whether we're generating Java or Kotlin.
-   *
-   * <p>When generating Java, we use the (mangled) JVM name rather than the source name because Java
-   * sources do not have access to the source name of an internal element (even if they're in the
-   * same build unit).
-   *
-   * <p>When generating Kotlin, we use the source name rather than the JVM name because Kotlin
-   * sources do not have access to the (mangled) JVM name of an internal element, which should be
-   * fine since the generated factory should always be in the same build unit as the binding method.
-   */
-  private String referenceName(XMethodElement method) {
-    return method.getJvmName();
-  }
-
   private XCodeBlock maybeWrapInCheckForNull(ProvisionBinding binding, XCodeBlock codeBlock) {
     return binding.shouldCheckForNull(compilerOptions)
         ? XCodeBlock.of(

dagger-compiler/main/java/dagger/internal/codegen/writing/InjectionMethods.java

@@ -440,7 +440,7 @@ private static XCodeBlock copyParameterInternal(
             nullability,
             compilerOptions));
     return isTypeNameAccessible
-        ? XCodeBlock.of("%L", name)
-        : XCodeBlock.ofCast(typeName, XCodeBlock.of("%L", name));
+        ? XCodeBlock.of("%N", name)
+        : XCodeBlock.ofCast(typeName, XCodeBlock.of("%N", name));
   }
 }

dagger-compiler/main/java/dagger/internal/codegen/writing/MembersInjectorGenerator.java

@@ -42,6 +42,7 @@
 import static dagger.internal.codegen.xprocessing.XElements.asTypeElement;
 import static dagger.internal.codegen.xprocessing.XElements.getSimpleName;
 import static dagger.internal.codegen.xprocessing.XFunSpecs.constructorBuilder;
+import static dagger.internal.codegen.xprocessing.XFunSpecs.getMethodReferenceName;
 import static dagger.internal.codegen.xprocessing.XFunSpecs.methodBuilder;
 import static dagger.internal.codegen.xprocessing.XTypeElements.typeVariableNames;
 import static dagger.internal.codegen.xprocessing.XTypeNames.membersInjectorOf;
@@ -181,7 +182,9 @@ private XFunSpec methodInjectionMethod(XMethodElement method, String methodName)
     XCodeBlock instance = copyInstance(builder, parameterNameSet, enclosingType.getType());
     XCodeBlock arguments =
         copyParameters(builder, parameterNameSet, method.getParameters(), compilerOptions);
-    return builder.addStatement("%L.%N(%L)", instance, method.getJvmName(), arguments).build();
+    return builder
+        .addStatement("%L.%N(%L)", instance, getMethodReferenceName(method), arguments)
+        .build();
   }
 
   // Example:

dagger-compiler/main/java/dagger/internal/codegen/xprocessing/XFunSpecs.java

@@ -48,6 +48,20 @@
 // TODO(bcorso): Consider moving these methods into XProcessing library.
 /** A utility class for {@link XFunSpec} helper methods. */
 public final class XFunSpecs {
+  /**
+   * Returns the name to use when referencing the given method based on the language of the
+   * generated code.
+   *
+   * <p>When referencing a method from a generated Java source, the method's JVM name is used. When
+   * referencing a method from a generated Kotlin source, the method's source name is used. This is
+   * particularly important for cases when a Kotlin method is annotated with {@code @JvmName} or has
+   * internal visibility since the source name won't be available to Java and the JVM name won't be
+   * available to Kotlin.
+   */
+  @SuppressWarnings("deprecation")
+  public static String getMethodReferenceName(XMethodElement method) {
+    return method.getJvmName();
+  }
 
   /** Returns a {@link Builder} that overrides the given method. */
   public static Builder overriding(

java/dagger/testing/compile/CompilerTests.java

@@ -117,11 +117,17 @@ public static Source.JavaSource javaSource(String fileName, String... srcLines)
   /** Returns a new {@link Source} with the content transformed by the given function. */
   public static Source transformContent(
       Source source, Function<String, String> contentTransformer) {
-    return Source.Companion.java(
-        // Remove the extension from the file name so that the file name.
-        source.getRelativePath()
-            .substring(0, source.getRelativePath().lastIndexOf('.')),
-        contentTransformer.apply(source.getContents()));
+    if (source instanceof Source.KotlinSource) {
+      return Source.Companion.kotlin(
+          source.getRelativePath(),
+          contentTransformer.apply(source.getContents()));
+    } else if (source instanceof Source.JavaSource) {
+      return Source.Companion.java(
+          ((Source.JavaSource) source).getQName(),
+          contentTransformer.apply(source.getContents()));
+    } else {
+      throw new AssertionError("Unexpected source type.");
+    }
   }
 
   /** Returns a {@link Compiler} instance with the given sources. */

javatests/dagger/functional/kotlinsrc/membersinject/subpackage/a/AGrandchild.kt

@@ -28,12 +28,14 @@ class AGrandchild : BChild() {
     this.aGrandchildMethod = aGrandchildMethod
   }
 
+  // Note: In the Java source version of this code we use protected; however, in the Kotlin source
+  // version we use public since Kotlin protected wouldn't allow access to the generated code.
   @Inject
-  protected override fun aParentMethod(aParentMethod: APublicObject) {
+  override fun aParentMethod(aParentMethod: APublicObject) {
     super.aParentMethod(aParentMethod)
   }
 
-  protected override fun aChildMethod(aChildMethod: APublicObject) {
+  override fun aChildMethod(aChildMethod: APublicObject) {
     super.aChildMethod(aChildMethod)
   }
 

javatests/dagger/functional/kotlinsrc/membersinject/subpackage/a/AParent.kt

@@ -22,8 +22,10 @@ open class AParent {
   @Inject internal lateinit var aParentField: AInternalObject
   private var aParentMethod: APublicObject? = null
 
+  // Note: In the Java source version of this code we use protected; however, in the Kotlin source
+  // version we use public since Kotlin protected wouldn't allow access to the generated code.
   @Inject
-  protected open fun aParentMethod(aParentMethod: APublicObject) {
+  open fun aParentMethod(aParentMethod: APublicObject) {
     this.aParentMethod = aParentMethod
   }
 

javatests/dagger/functional/kotlinsrc/membersinject/subpackage/b/BChild.kt

@@ -24,12 +24,14 @@ open class BChild : AParent() {
   @Inject internal lateinit var aChildField: BInternalObject
   private var aChildMethod: APublicObject? = null
 
+  // Note: In the Java source version of this code we use protected; however, in the Kotlin source
+  // version we use public since Kotlin protected wouldn't allow access to the generated code.
   @Inject
-  protected open fun aChildMethod(aChildMethod: APublicObject) {
+  open fun aChildMethod(aChildMethod: APublicObject) {
     this.aChildMethod = aChildMethod
   }
 
-  protected override fun aParentMethod(aParentMethod: APublicObject) {
+  override fun aParentMethod(aParentMethod: APublicObject) {
     super.aParentMethod(aParentMethod)
   }
 

javatests/dagger/functional/membersinject/MembersInjectTypeParameterWithVarianceTest.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2026 The Dagger Authors.
+ *
+ * Licensed 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.
+ */
+
+package dagger.functional.membersinject;
+
+import java.util.List;
+import javax.inject.Inject;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+// TODO: b/477601223 - Remove this test once this bug is fixed, as it should already be covered by
+// MembersInjectionTest#membersInjectorSuperTypeWithInaccessibleTypeArgument().
+@SuppressWarnings("unused") // This test is just used to check that the code compiles.
+@RunWith(JUnit4.class)
+public class MembersInjectTypeParameterWithVarianceTest {
+  public static class Foo<T> {
+    @Inject T t;
+    @Inject List<T> listT;
+    @Inject List<? extends T> listExtendsT;
+    @Inject List<? extends T>[] arrayListExtendsT;
+
+    @Inject
+    void method(
+        T t,
+        List<T> listT,
+        List<? extends T> listExtendsT,
+        List<? extends T>[] arrayListExtendsT) {}
+  }
+
+  @Test
+  public void testBuild() {
+    // If this compiles, then this test is WAI.
+  }
+}

javatests/dagger/internal/codegen/ComponentProcessorTest.java

@@ -1479,7 +1479,8 @@ public void unprocessedMembersInjectorNotes() {
               subject.hasWarningCount(0);
 
               String generatedFileTemplate =
-                  "dagger/internal/codegen/ComponentProcessorTestClasses_%s_MembersInjector.java";
+                  "dagger/internal/codegen/ComponentProcessorTestClasses_%s_MembersInjector"
+                      + (compilerMode.isKotlinCodegenEnabled() ? ".kt" : ".java");
               String noteTemplate =
                   "Generating a MembersInjector for "
                       + "dagger.internal.codegen.ComponentProcessorTestClasses.%s.";

javatests/dagger/internal/codegen/InjectConstructorFactoryGeneratorTest.java

@@ -1778,8 +1778,7 @@ public void testQualifierMetadata() throws Exception {
             subject -> {
               subject.hasErrorCount(0);
               assertSourceMatchesGolden(subject, "test/SomeBinding_Factory");
-              subject.generatedSource(
-                  goldenFileRule.goldenSource("test/SomeBinding_MembersInjector"));
+              assertSourceMatchesGolden(subject, "test/SomeBinding_MembersInjector");
             });
   }
 
@@ -1854,8 +1853,7 @@ public void testComplexQualifierMetadata() throws Exception {
             subject -> {
               subject.hasErrorCount(0);
               assertSourceMatchesGolden(subject, "test/SomeBinding_Factory");
-              subject.generatedSource(
-                  goldenFileRule.goldenSource("test/SomeBinding_MembersInjector"));
+              assertSourceMatchesGolden(subject, "test/SomeBinding_MembersInjector");
             });
   }
 
@@ -1962,9 +1960,9 @@ public void testBaseClassQualifierMetadata() throws Exception {
             subject -> {
               subject.hasErrorCount(0);
               assertSourceMatchesGolden(subject, "test/Foo_Factory");
-              subject.generatedSource(goldenFileRule.goldenSource("test/Foo_MembersInjector"));
+              assertSourceMatchesGolden(subject, "test/Foo_MembersInjector");
               assertSourceMatchesGolden(subject, "test/FooBase_Factory");
-              subject.generatedSource(goldenFileRule.goldenSource("test/FooBase_MembersInjector"));
+              assertSourceMatchesGolden(subject, "test/FooBase_MembersInjector");
             });
   }