Fix exception when reporting WRONG_TYPE_PARAMETER_NULLABILITY_FOR_JAVA_OVERRIDE

^KT-51979 Fixed

Author: dzharkov

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/diagnostic/compiler/based/DiagnosisCompilerTestFE10TestdataTestGenerated.java

@@ -8,6 +8,7 @@ package org.jetbrains.kotlin.resolve.jvm.checkers
 import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
 import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.DeclarationDescriptor
+import org.jetbrains.kotlin.lexer.KtTokens
 import org.jetbrains.kotlin.load.java.descriptors.JavaMethodDescriptor
 import org.jetbrains.kotlin.psi.KtDeclaration
 import org.jetbrains.kotlin.resolve.OverridingUtil
@@ -27,6 +28,10 @@ object JavaOverrideWithWrongNullabilityOverrideChecker : DeclarationChecker {
         if (descriptor !is CallableMemberDescriptor) return
         if (descriptor.overriddenDescriptors.isEmpty()) return
 
+        val modifierList = declaration.modifierList
+        val hasOverrideNode = modifierList != null && modifierList.hasModifier(KtTokens.OVERRIDE_KEYWORD)
+        if (!hasOverrideNode) return
+
         val containingClass = descriptor.containingDeclaration as? ClassDescriptor ?: return
 
         for (overriddenDescriptor in descriptor.overriddenDescriptors) {

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsTestGenerated.java

@@ -0,0 +1,14 @@
+// !SKIP_JAVAC
+// SKIP_TXT
+// !LANGUAGE: -ProhibitUsingNullableTypeParameterAgainstNotNullAnnotated
+// FILE: JavaInterface.java
+import org.jetbrains.annotations.NotNull;
+
+public interface JavaInterface<V> {
+    void interfaceMethod(@NotNull V value);
+}
+
+// FILE: main.kt
+interface KotlinInterface<X> : JavaInterface<X> {
+    override <!SYNTAX!><<!><!SYNTAX!>T<!><!SYNTAX!>><!> fun interfaceMethod(x: X)
+}

compiler/fir/analysis-tests/tests-gen/org/jetbrains/kotlin/test/runners/FirOldFrontendDiagnosticsWithLightTreeTestGenerated.java

@@ -0,0 +1,14 @@
+// !SKIP_JAVAC
+// SKIP_TXT
+// !LANGUAGE: -ProhibitUsingNullableTypeParameterAgainstNotNullAnnotated
+// FILE: JavaInterface.java
+import org.jetbrains.annotations.NotNull;
+
+public interface JavaInterface<V> {
+    void interfaceMethod(@NotNull V value);
+}
+
+// FILE: main.kt
+interface KotlinInterface<X> : JavaInterface<X> {
+    override <!SYNTAX!><<!><!SYNTAX!>T<!><!SYNTAX!>><!> fun <!VIRTUAL_MEMBER_HIDDEN!>interfaceMethod<!>(x: X)
+}