diff --git a/core/util.runtime/src/org/jetbrains/kotlin/load/java/JavaNullabilityAnnotationSettings.kt b/core/util.runtime/src/org/jetbrains/kotlin/load/java/JavaNullabilityAnnotationSettings.kt
index 1d4fb453367..102eefcdcbc 100644
--- a/core/util.runtime/src/org/jetbrains/kotlin/load/java/JavaNullabilityAnnotationSettings.kt
+++ b/core/util.runtime/src/org/jetbrains/kotlin/load/java/JavaNullabilityAnnotationSettings.kt
@@ -6,7 +6,7 @@
 package org.jetbrains.kotlin.load.java
 
 import org.jetbrains.kotlin.name.FqName
-import org.jetbrains.kotlin.name.isChildOf
+import org.jetbrains.kotlin.name.findValueForMostSpecificFqname
 
 val JSPECIFY_ANNOTATIONS_PACKAGE = FqName("org.jspecify.nullness")
 val CHECKER_FRAMEWORK_COMPATQUAL_ANNOTATIONS_PACKAGE = FqName("org.checkerframework.checker.nullness.compatqual")
@@ -38,21 +38,10 @@ val jsr305Settings = JavaNullabilityAnnotationsStatus(
 
 fun getDefaultReportLevelForAnnotation(annotationFqName: FqName) = getReportLevelForAnnotation(annotationFqName, emptyMap())
 
-fun getReportLevelForAnnotation(annotationFqName: FqName, configuredReportLevels: Map<FqName, ReportLevel>): ReportLevel {
-    val configuredReportLevel = configuredReportLevels.entries.find { (fqName, _) ->
-        annotationFqName == fqName || annotationFqName.isChildOf(fqName)
-    }?.value
+fun getReportLevelForAnnotation(annotation: FqName, configuredReportLevels: Map<FqName, ReportLevel>): ReportLevel {
+    annotation.findValueForMostSpecificFqname(configuredReportLevels)?.let { return it }
 
-    if (configuredReportLevel != null) return configuredReportLevel
-
-    val defaultReportLevel = nullabilityAnnotationSettings.entries.find { (fqName, _) ->
-        annotationFqName == fqName || annotationFqName.isChildOf(fqName)
-    }?.value
-
-    require(defaultReportLevel != null) {
-        println(nullabilityAnnotationSettings)
-        "Default settings for nullability annotation ${annotationFqName.asString()} must be described"
-    }
+    val defaultReportLevel = annotation.findValueForMostSpecificFqname(nullabilityAnnotationSettings) ?: return ReportLevel.IGNORE
 
     return if (defaultReportLevel.sinceVersion != null && defaultReportLevel.sinceVersion <= KotlinVersion.CURRENT) {
         defaultReportLevel.reportLevelAfter
diff --git a/core/util.runtime/src/org/jetbrains/kotlin/name/FqNamesUtil.kt b/core/util.runtime/src/org/jetbrains/kotlin/name/FqNamesUtil.kt
index b71e4f5a67e..8adaa267b57 100644
--- a/core/util.runtime/src/org/jetbrains/kotlin/name/FqNamesUtil.kt
+++ b/core/util.runtime/src/org/jetbrains/kotlin/name/FqNamesUtil.kt
@@ -1,17 +1,6 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
- *
- * 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.
+ * Copyright 2010-2021 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
 package org.jetbrains.kotlin.name
@@ -72,11 +61,17 @@ fun isValidJavaFqName(qualifiedName: String?): Boolean {
             State.MIDDLE -> {
                 if (c == '.') {
                     state = State.AFTER_DOT
-                }
-                else if (!Character.isJavaIdentifierPart(c)) return false
+                } else if (!Character.isJavaIdentifierPart(c)) return false
             }
         }
     }
 
     return state != State.AFTER_DOT
 }
+
+fun <V> FqName.findValueForMostSpecificFqname(values: Map<FqName, V>): V? {
+    val suitableItems = values.filter { (fqName, _) -> this == fqName || this.isChildOf(fqName) }
+        .takeIf { it.isNotEmpty() } ?: return null
+
+    return suitableItems.minByOrNull { (fqName, _) -> fqName.tail(this).asString().length }?.value
+}