Force resolve outermost class for Java nested classes.

This is a temporary workaround for #1034

(cherry picked from commit 5f5977e)

compiler-plugin/src/main/kotlin/com/google/devtools/ksp/processing/impl/ResolverImpl.kt

@@ -64,6 +64,9 @@ import org.jetbrains.kotlin.load.java.lazy.descriptors.LazyJavaTypeParameterDesc
 import org.jetbrains.kotlin.load.java.lazy.types.JavaTypeResolver
 import org.jetbrains.kotlin.load.java.lazy.types.toAttributes
 import org.jetbrains.kotlin.load.java.sources.JavaSourceElement
+import org.jetbrains.kotlin.load.java.structure.JavaClass
+import org.jetbrains.kotlin.load.java.structure.JavaClassifierType
+import org.jetbrains.kotlin.load.java.structure.classId
 import org.jetbrains.kotlin.load.java.structure.impl.JavaArrayTypeImpl
 import org.jetbrains.kotlin.load.java.structure.impl.JavaClassImpl
 import org.jetbrains.kotlin.load.java.structure.impl.JavaConstructorImpl
@@ -624,6 +627,17 @@ class ResolverImpl(
         }
         // Construct resolver context for the PsiType
         var resolverContext = lazyJavaResolverContext
+        // TODO: fix in compiler.
+        // Temporary work around for https://github.com/google/ksp/issues/1034
+        // Force resolve outer most class for Java nested classes.
+        javaType.safeAs<JavaClassifierType>()?.classifier.safeAs<JavaClass>()?.let {
+            var outerMost = it.outerClass
+            while (outerMost?.outerClass != null) {
+                outerMost = outerMost.outerClass
+            }
+            outerMost?.classId?.let { lazyJavaResolverContext.components.finder.findClass(it) }
+        }
+
         for (e in stack) {
             when (e) {
                 is KSFunctionDeclarationJavaImpl -> {

integration-tests/src/test/kotlin/com/google/devtools/ksp/test/JavaNestedClassIT.kt

@@ -0,0 +1,22 @@
+package com.google.devtools.ksp.test
+
+import org.gradle.testkit.runner.GradleRunner
+import org.gradle.testkit.runner.TaskOutcome
+import org.junit.Assert
+import org.junit.Rule
+import org.junit.Test
+
+class JavaNestedClassIT {
+    @Rule
+    @JvmField
+    val project: TemporaryTestProject = TemporaryTestProject("javaNestedClass")
+
+    @Test
+    fun testJavaNestedClass() {
+
+        val gradleRunner = GradleRunner.create().withProjectDir(project.root)
+
+        val resultCleanBuild = gradleRunner.withArguments("clean", "build").build()
+        Assert.assertEquals(TaskOutcome.SUCCESS, resultCleanBuild.task(":workload:build")?.outcome)
+    }
+}

integration-tests/src/test/resources/javaNestedClass/build.gradle.kts

@@ -0,0 +1,8 @@
+plugins {
+    kotlin("jvm")
+}
+
+repositories {
+    mavenCentral()
+    maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap/")
+}

integration-tests/src/test/resources/javaNestedClass/settings.gradle.kts

@@ -0,0 +1,19 @@
+pluginManagement {
+    val kotlinVersion: String by settings
+    val kspVersion: String by settings
+    val testRepo: String by settings
+    plugins {
+        id("com.google.devtools.ksp") version kspVersion
+        kotlin("jvm") version kotlinVersion
+    }
+    repositories {
+        maven(testRepo)
+        gradlePluginPortal()
+        maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap/")
+    }
+}
+
+rootProject.name = "javaNestedClass"
+
+include(":workload")
+include(":test-processor")

integration-tests/src/test/resources/javaNestedClass/test-processor/build.gradle.kts

@@ -0,0 +1,25 @@
+val kspVersion: String by project
+val testRepo: String by project
+
+plugins {
+    kotlin("jvm")
+}
+
+group = "com.example"
+version = "1.0-SNAPSHOT"
+
+repositories {
+    maven(testRepo)
+    mavenCentral()
+    maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap/")
+}
+
+dependencies {
+    implementation(kotlin("stdlib"))
+    implementation("com.squareup:javapoet:1.12.1")
+    implementation("com.google.devtools.ksp:symbol-processing-api:$kspVersion")
+}
+
+sourceSets.main {
+    java.srcDirs("src/main/kotlin")
+}

integration-tests/src/test/resources/javaNestedClass/test-processor/src/main/kotlin/ValidateProcessor.kt

@@ -0,0 +1,24 @@
+import com.google.devtools.ksp.getClassDeclarationByName
+import com.google.devtools.ksp.processing.*
+import com.google.devtools.ksp.symbol.*
+import com.google.devtools.ksp.validate
+
+class ValidateProcessor(env: SymbolProcessorEnvironment) : SymbolProcessor {
+    var logger: KSPLogger = env.logger
+
+    override fun process(resolver: Resolver): List<KSAnnotated> {
+        val javaClass = resolver.getClassDeclarationByName("com.example.JavaClass")!!
+        if (!javaClass.validate()) {
+            logger.error("Failed to validate $javaClass")
+        }
+        return emptyList()
+    }
+}
+
+class ValidateProcessorProvider : SymbolProcessorProvider {
+    override fun create(
+        env: SymbolProcessorEnvironment
+    ): SymbolProcessor {
+        return ValidateProcessor(env)
+    }
+}

integration-tests/src/test/resources/javaNestedClass/test-processor/src/main/resources/META-INF/services/com.google.devtools.ksp.processing.SymbolProcessorProvider

@@ -0,0 +1 @@
+ValidateProcessorProvider

integration-tests/src/test/resources/javaNestedClass/workload/build.gradle.kts

@@ -0,0 +1,20 @@
+val testRepo: String by project
+
+plugins {
+    id("com.google.devtools.ksp")
+    kotlin("jvm")
+}
+
+version = "1.0-SNAPSHOT"
+
+repositories {
+    maven(testRepo)
+    mavenCentral()
+    maven("https://maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap/")
+}
+
+dependencies {
+    implementation(kotlin("stdlib"))
+    implementation(project(":test-processor"))
+    ksp(project(":test-processor"))
+}

integration-tests/src/test/resources/javaNestedClass/workload/src/main/java/com/example/A.kt

@@ -0,0 +1,4 @@
+package com.example
+
+fun main() {
+}

integration-tests/src/test/resources/javaNestedClass/workload/src/main/java/com/example/JavaClass.java

@@ -0,0 +1,12 @@
+package com.example;
+
+public class JavaClass {
+
+    public int b2;
+
+    public ENUM e;
+
+    public enum ENUM {
+        R,G,B
+    }
+}