From caaf2114bfe751438950a1dda3bac2b7ea349a9f Mon Sep 17 00:00:00 2001
From: Alexey Andreev <Alexey.Andreev@jetbrains.com>
Date: Thu, 25 Jan 2018 21:53:28 +0300
Subject: [PATCH] Fix error when superclass has final String fields

---
 .../org/teavm/backend/javascript/runtime.js         |  2 +-
 tests/src/test/java/org/teavm/vm/VMTest.java        | 13 +++++++++++++
 2 files changed, 14 insertions(+), 1 deletion(-)

diff --git a/core/src/main/resources/org/teavm/backend/javascript/runtime.js b/core/src/main/resources/org/teavm/backend/javascript/runtime.js
index 4fcaabc1b..ac10b1443 100644
--- a/core/src/main/resources/org/teavm/backend/javascript/runtime.js
+++ b/core/src/main/resources/org/teavm/backend/javascript/runtime.js
@@ -441,7 +441,7 @@ function $rt_metadata(data) {
         m.supertypes = data[i + 3];
         if (m.superclass) {
             m.supertypes.push(m.superclass);
-            cls.prototype = new m.superclass();
+            cls.prototype = Object.create(m.superclass.prototype);
         } else {
             cls.prototype = {};
         }
diff --git a/tests/src/test/java/org/teavm/vm/VMTest.java b/tests/src/test/java/org/teavm/vm/VMTest.java
index 72bbe6f4d..061781cfa 100644
--- a/tests/src/test/java/org/teavm/vm/VMTest.java
+++ b/tests/src/test/java/org/teavm/vm/VMTest.java
@@ -440,4 +440,17 @@ public class VMTest {
         a[0] = "bar";
         assertEquals("foo", b[0]);
     }
+
+
+    @Test
+    public void stringConstantsInBaseClass() {
+        new DerivedClassWithConstantFields();
+    }
+
+    static class BaseClassWithConstantFields {
+        public final String foo = "bar";
+    }
+
+    static class DerivedClassWithConstantFields extends BaseClassWithConstantFields {
+    }
 }
\ No newline at end of file