Avoids pre-validating the nearest enclosing type in the InjectProcessingStep.

java/dagger/internal/codegen/processingstep/InjectProcessingStep.java

@@ -53,6 +53,14 @@ public ImmutableSet<ClassName> annotationClassNames() {
     return ImmutableSet.of(TypeNames.INJECT, TypeNames.INJECT_JAVAX, TypeNames.ASSISTED_INJECT);
   }
 
+  // Override to avoid prevalidation. The InjectProcessingStep does all of the required validation
+  // within InjectValidator so there's no need to prevalidate the nearest enclosing type element.
+  // TODO(bcorso): Once all processing steps handle their own validation we can remove this.
+  @Override
+  protected boolean requiresPreValidation() {
+    return false;
+  }
+
   @Override
   protected void process(XElement injectElement, ImmutableSet<ClassName> annotations) {
     // Only process an element once to avoid getting duplicate errors when an element is annotated

java/dagger/internal/codegen/processingstep/TypeCheckingProcessingStep.java

@@ -75,7 +75,9 @@ public ImmutableSet<XElement> process(
                 // TODO(b/201479062): It's inefficient to require validation of the entire enclosing
                 //  type, we should try to remove this and handle any additional validation into the
                 //  steps that need it.
-                superficialValidator.throwIfNearestEnclosingTypeNotValid(element);
+                if (requiresPreValidation()) {
+                  superficialValidator.throwIfNearestEnclosingTypeNotValid(element);
+                }
                 process((E) element, annotations);
               } catch (TypeNotPresentException e) {
                 // TODO(bcorso): We should be able to remove this once we replace all calls to
@@ -97,6 +99,15 @@ public ImmutableSet<XElement> process(
     return deferredElements.build();
   }
 
+  /**
+   * Returns {@code true} if this processing step requires pre-validation of the annotated element's
+   * nearest enclosing type element.
+   */
+  // TODO(bcorso): Once all processing steps handle their own validation we can remove this.
+  protected boolean requiresPreValidation() {
+    return true;
+  }
+
   @Override
   public void processOver(
       XProcessingEnv env, Map<String, ? extends Set<? extends XElement>> elementsByAnnotation) {

javatests/artifacts/dagger/build-tests/src/test/java/buildtests/InjectClassNonDaggerMethodTest.java

@@ -0,0 +1,135 @@
+/*
+ * Copyright (C) 2022 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 buildtests;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import java.io.File;
+import java.io.IOException;
+import org.gradle.testkit.runner.BuildResult;
+import org.gradle.testkit.runner.GradleRunner;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.TemporaryFolder;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+
+// This is a regression test for https://github.com/google/dagger/issues/3522
+@RunWith(JUnit4.class)
+public class InjectClassNonDaggerMethodTest {
+  private static final String JAVAC_ERROR_MESSAGE =
+      "Foo.java:8: error: cannot find symbol";
+
+  private static final String DAGGER_ERROR_MESSAGE =
+      "InjectProcessingStep was unable to process 'Foo()' because 'MissingClass' could not be "
+          + "resolved";
+
+  @Rule public TemporaryFolder folder = new TemporaryFolder();
+
+  @Test
+  public void testInjectMethod() throws IOException {
+    BuildResult result = setupRunner(/* useInject= */ true).buildAndFail();
+
+    // Assert that the inject method has both a javac error and a dagger error.
+    assertThat(result.getOutput()).contains("Task :library1:compileJava FAILED");
+    assertThat(result.getOutput()).contains(JAVAC_ERROR_MESSAGE);
+    assertThat(result.getOutput()).contains(DAGGER_ERROR_MESSAGE);
+  }
+
+  @Test
+  public void testNonInjectMethod() throws IOException {
+    BuildResult result = setupRunner(/* useInject= */ false).buildAndFail();
+
+    // Assert that the non-inject method has a javac error but not a dagger error.
+    assertThat(result.getOutput()).contains("Task :library1:compileJava FAILED");
+    assertThat(result.getOutput()).contains(JAVAC_ERROR_MESSAGE);
+    assertThat(result.getOutput()).doesNotContain(DAGGER_ERROR_MESSAGE);
+  }
+
+  private GradleRunner setupRunner(boolean useInject) throws IOException {
+    File projectDir = folder.getRoot();
+    GradleModule.create(projectDir)
+        .addSettingsFile(
+            "include 'app'",
+            "include 'library1'")
+        .addBuildFile(
+            "buildscript {",
+            "  ext {",
+            String.format("dagger_version = \"%s\"", System.getProperty("dagger_version")),
+            String.format("kotlin_version = \"%s\"", System.getProperty("kotlin_version")),
+            "  }",
+            "}",
+            "",
+            "allprojects {",
+            "  repositories {",
+            "    mavenCentral()",
+            "    mavenLocal()",
+            "  }",
+            "}");
+
+    GradleModule.create(projectDir, "app")
+        .addBuildFile(
+            "plugins {",
+            "  id 'java'",
+            "  id 'application'",
+            "}",
+            "dependencies {",
+            "  implementation project(':library1')",
+            "  implementation \"com.google.dagger:dagger:$dagger_version\"",
+            "  annotationProcessor \"com.google.dagger:dagger-compiler:$dagger_version\"",
+            "}")
+        .addSrcFile(
+            "MyComponent.java",
+            "package app;",
+            "",
+            "import dagger.Component;",
+            "import library1.Foo;",
+            "",
+            "@Component",
+            "interface MyComponent {",
+            "  Foo foo();",
+            "}");
+
+    GradleModule.create(projectDir, "library1")
+        .addBuildFile(
+            "plugins {",
+            "  id 'java'",
+            "  id 'java-library'",
+            "}",
+            "dependencies {",
+            "  implementation \"com.google.dagger:dagger:$dagger_version\"",
+            "  annotationProcessor \"com.google.dagger:dagger-compiler:$dagger_version\"",
+            "}")
+        .addSrcFile(
+            "Foo.java",
+            "package library1;",
+            "",
+            "import javax.inject.Inject;",
+            "",
+            "class Foo {",
+            "  @Inject Foo() {}",
+            "",
+            useInject
+                ? "  @Inject void method(MissingClass missingClass) {}"
+                : "  void method(MissingClass missingClass) {}",
+            "}");
+
+    return GradleRunner.create()
+        .withArguments("--stacktrace", "build")
+        .withProjectDir(projectDir);
+  }
+}