Light classes: getOwnInnerClasses() filters out inner classes with null names

#KT-13927 Fixed

compiler/light-classes/src/org/jetbrains/kotlin/asJava/classes/KtLightClassForSourceDeclaration.kt

@@ -317,7 +317,12 @@ abstract class KtLightClassForSourceDeclaration(protected val classOrObject: KtC
 
     override fun getOwnInnerClasses(): List<PsiClass> {
         val result = ArrayList<PsiClass>()
-        classOrObject.declarations.filterIsInstance<KtClassOrObject>().mapNotNullTo(result) { create(it) }
+        classOrObject.declarations.filterIsInstance<KtClassOrObject>()
+                // workaround for ClassInnerStuffCache not supporting classes with null names, see KT-13927
+                // inner classes with null names can't be searched for and can't be used from java anyway
+                // we can't prohibit creating light classes with null names either since they can contain members
+                .filter { it.name != null }
+                .mapNotNullTo(result) { create(it) }
 
         if (classOrObject.hasInterfaceDefaultImpls) {
             result.add(KtLightClassForInterfaceDefaultImpls(classOrObject))

idea/testData/kotlinAndJavaChecker/javaWithKotlin/InnerClassWithoutName.java

@@ -0,0 +1,6 @@
+public class InnerClassWithoutName {
+    public void uses() {
+        Test5 test5 = new Test5();
+        Test5.In1 in1 = test5.new In1();
+    }
+}

idea/testData/kotlinAndJavaChecker/javaWithKotlin/InnerClassWithoutName.kt

@@ -0,0 +1,4 @@
+class Test5 {
+    inner class In1 {}
+    inner class
+}

idea/tests/org/jetbrains/kotlin/checkers/JavaAgainstKotlinSourceCheckerTestGenerated.java

@@ -148,6 +148,12 @@ public class JavaAgainstKotlinSourceCheckerTestGenerated extends AbstractJavaAga
             KotlinTestUtils.assertAllTestsPresentByMetadata(this.getClass(), new File("idea/testData/kotlinAndJavaChecker/javaWithKotlin"), Pattern.compile("^(.+)\\.kt$"), true);
         }
 
+        @TestMetadata("InnerClassWithoutName.kt")
+        public void testInnerClassWithoutName() throws Exception {
+            String fileName = KotlinTestUtils.navigationMetadata("idea/testData/kotlinAndJavaChecker/javaWithKotlin/InnerClassWithoutName.kt");
+            doTest(fileName);
+        }
+
         @TestMetadata("NoNotNullOnParameterInOverride.kt")
         public void testNoNotNullOnParameterInOverride() throws Exception {
             String fileName = KotlinTestUtils.navigationMetadata("idea/testData/kotlinAndJavaChecker/javaWithKotlin/NoNotNullOnParameterInOverride.kt");