From 1cfdb8fd15c12b166c9496c6199a9d49e1b7e8ae Mon Sep 17 00:00:00 2001
From: "Anna.Kozlova" <anna.kozlova@jetbrains.com>
Date: Fri, 13 Apr 2018 19:53:51 +0200
Subject: [PATCH] ensure write access (IDEA-190250)

---
 .../java/AcceptedLanguageLevelsSettings.java  | 20 ++++++++++---------
 1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/java/java-impl/src/com/intellij/pom/java/AcceptedLanguageLevelsSettings.java b/java/java-impl/src/com/intellij/pom/java/AcceptedLanguageLevelsSettings.java
index 970e94a654fc..04c77020a65a 100644
--- a/java/java-impl/src/com/intellij/pom/java/AcceptedLanguageLevelsSettings.java
+++ b/java/java-impl/src/com/intellij/pom/java/AcceptedLanguageLevelsSettings.java
@@ -101,16 +101,18 @@ public class AcceptedLanguageLevelsSettings implements PersistentStateComponent<
 
     if (modules != null) {
       JavaProjectModelModificationService service = JavaProjectModelModificationService.getInstance(project);
-      for (Module module : modules) {
-        if (module != null) {
-          service.changeLanguageLevel(module, languageLevel);
+      WriteAction.run(() -> {
+        for (Module module : modules) {
+          if (module != null) {
+            service.changeLanguageLevel(module, languageLevel);
+          }
+          else {
+            LanguageLevelProjectExtension projectExtension = LanguageLevelProjectExtension.getInstance(project);
+            projectExtension.setLanguageLevel(languageLevel);
+            projectExtension.setDefault(false);
+          }
         }
-        else {
-          LanguageLevelProjectExtension projectExtension = LanguageLevelProjectExtension.getInstance(project);
-          projectExtension.setLanguageLevel(languageLevel);
-          projectExtension.setDefault(false);
-        }
-      }
+      });
     }
   }