Fix IllegalAccessException on private annotation in reflection

#KT-14094 Fixed

compiler/testData/codegen/box/reflection/annotations/privateAnnotation.kt

@@ -0,0 +1,14 @@
+// IGNORE_BACKEND: JS, NATIVE
+// WITH_REFLECT
+
+annotation private class Ann(val name: String)
+
+class A {
+    @Ann("OK")
+    fun foo() {}
+}
+
+fun box(): String {
+    val ann = A::class.members.single { it.name == "foo" }.annotations.single() as Ann
+    return ann.name
+}

compiler/tests-ir-jvm/tests/org/jetbrains/kotlin/codegen/ir/IrBlackBoxCodegenTestGenerated.java

@@ -13843,6 +13843,12 @@ public class IrBlackBoxCodegenTestGenerated extends AbstractIrBlackBoxCodegenTes
                 doTest(fileName);
             }
 
+            @TestMetadata("privateAnnotation.kt")
+            public void testPrivateAnnotation() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/privateAnnotation.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("propertyAccessors.kt")
             public void testPropertyAccessors() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/propertyAccessors.kt");

compiler/tests/org/jetbrains/kotlin/codegen/BlackBoxCodegenTestGenerated.java

@@ -13843,6 +13843,12 @@ public class BlackBoxCodegenTestGenerated extends AbstractBlackBoxCodegenTest {
                 doTest(fileName);
             }
 
+            @TestMetadata("privateAnnotation.kt")
+            public void testPrivateAnnotation() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/privateAnnotation.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("propertyAccessors.kt")
             public void testPropertyAccessors() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/propertyAccessors.kt");

compiler/tests/org/jetbrains/kotlin/codegen/LightAnalysisModeTestGenerated.java

@@ -13843,6 +13843,12 @@ public class LightAnalysisModeTestGenerated extends AbstractLightAnalysisModeTes
                 doTest(fileName);
             }
 
+            @TestMetadata("privateAnnotation.kt")
+            public void testPrivateAnnotation() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/privateAnnotation.kt");
+                doTest(fileName);
+            }
+
             @TestMetadata("propertyAccessors.kt")
             public void testPropertyAccessors() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/propertyAccessors.kt");

core/descriptors.runtime/src/org/jetbrains/kotlin/load/kotlin/reflect/ReflectKotlinClass.kt

@@ -169,7 +169,16 @@ private object ReflectClassStructure {
             annotationType: Class<*>
     ) {
         for (method in annotationType.declaredMethods) {
-            processAnnotationArgumentValue(visitor, Name.identifier(method.name), method(annotation)!!)
+            val value = try {
+                method(annotation)!!
+            }
+            catch (e: IllegalAccessException) {
+                // This is possible if the annotation class is package local. In this case, we can't read the value into descriptor.
+                // However, this might be OK, because we do not use any data from AnnotationDescriptor in KAnnotatedElement implementations
+                // anyway; we use the source element and the underlying physical Annotation object to implement the needed API
+                continue
+            }
+            processAnnotationArgumentValue(visitor, Name.identifier(method.name), value)
         }
         visitor.visitEnd()
     }

js/js.tests/test/org/jetbrains/kotlin/js/test/semantics/JsCodegenBoxTestGenerated.java

@@ -15667,6 +15667,18 @@ public class JsCodegenBoxTestGenerated extends AbstractJsCodegenBoxTest {
                 throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
             }
 
+            @TestMetadata("privateAnnotation.kt")
+            public void testPrivateAnnotation() throws Exception {
+                String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/privateAnnotation.kt");
+                try {
+                    doTest(fileName);
+                }
+                catch (Throwable ignore) {
+                    return;
+                }
+                throw new AssertionError("Looks like this test can be unmuted. Remove IGNORE_BACKEND directive for that.");
+            }
+
             @TestMetadata("propertyAccessors.kt")
             public void testPropertyAccessors() throws Exception {
                 String fileName = KotlinTestUtils.navigationMetadata("compiler/testData/codegen/box/reflection/annotations/propertyAccessors.kt");