SLING-7677 - FeatureJSONWriter uses isOptional instead of isRequired
diff --git a/src/main/java/org/apache/sling/feature/io/json/JSONWriterBase.java b/src/main/java/org/apache/sling/feature/io/json/JSONWriterBase.java
index cfb6d9b..388bc69 100644
--- a/src/main/java/org/apache/sling/feature/io/json/JSONWriterBase.java
+++ b/src/main/java/org/apache/sling/feature/io/json/JSONWriterBase.java
@@ -218,7 +218,7 @@
             final List<Extension> extensions,
             final Configurations allConfigs) {
         for(final Extension ext : extensions) {
-            final String key = ext.getName() + ":" + ext.getType().name() + "|" + ext.isOptional();
+            final String key = ext.getName() + ":" + ext.getType().name() + "|" + ext.isRequired();
             if ( ext.getType() == ExtensionType.JSON ) {
                 final JsonStructure struct;
                 try ( final StringReader reader = new StringReader(ext.getJSON()) ) {
diff --git a/src/test/java/org/apache/sling/feature/io/json/ArtifactsExtensions.java b/src/test/java/org/apache/sling/feature/io/json/ArtifactsExtensions.java
new file mode 100644
index 0000000..bdd34f1
--- /dev/null
+++ b/src/test/java/org/apache/sling/feature/io/json/ArtifactsExtensions.java
@@ -0,0 +1,56 @@
+package org.apache.sling.feature.io.json;
+
+import org.apache.sling.feature.ArtifactId;
+import org.apache.sling.feature.Extension;
+import org.apache.sling.feature.Extensions;
+import org.apache.sling.feature.Feature;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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.
+ */
+public class ArtifactsExtensions {
+
+    public static void testReadArtifactsExtensions(Feature feature) {
+        Extensions extensions = feature.getExtensions();
+
+        assertEquals(2, extensions.size());
+
+        Extension extension1 = extensions.getByName("my-extension1");
+        assertNotNull(extension1);
+        assertEquals(extension1.getName(), "my-extension1");
+        assertEquals(extension1.isRequired(), false);
+        assertEquals(1, extension1.getArtifacts().size());
+
+        ArtifactId artifactId1 = extension1.getArtifacts().get(0).getId();
+        assertEquals(artifactId1.getGroupId(), "org.apache.sling");
+        assertEquals(artifactId1.getArtifactId(), "my-extension1");
+        assertEquals(artifactId1.getVersion(), "1.2.3");
+
+        Extension extension2 = extensions.getByName("my-extension2");
+        assertNotNull(extension2);
+        assertEquals(extension2.getName(), "my-extension2");
+        assertEquals(extension2.isRequired(), true);
+        assertEquals(1, extension2.getArtifacts().size());
+
+        ArtifactId artifactId2 = extension2.getArtifacts().get(0).getId();
+        assertEquals(artifactId2.getGroupId(), "org.apache.sling");
+        assertEquals(artifactId2.getArtifactId(), "my-extension2");
+        assertEquals(artifactId2.getVersion(), "1.2.3");
+    }
+}
diff --git a/src/test/java/org/apache/sling/feature/io/json/FeatureJSONReaderTest.java b/src/test/java/org/apache/sling/feature/io/json/FeatureJSONReaderTest.java
index 6acd293..aa7559c 100644
--- a/src/test/java/org/apache/sling/feature/io/json/FeatureJSONReaderTest.java
+++ b/src/test/java/org/apache/sling/feature/io/json/FeatureJSONReaderTest.java
@@ -213,6 +213,11 @@
         }
     }
 
+    @Test public void testReadArtifactsExtensions() throws Exception {
+        final Feature feature = U.readFeature("artifacts-extension", SubstituteVariables.NONE);
+        ArtifactsExtensions.testReadArtifactsExtensions(feature);
+    }
+
     private void setPrivateField(Object obj, String name, Object value) throws Exception {
         Field field = obj.getClass().getDeclaredField(name);
         field.setAccessible(true);
diff --git a/src/test/java/org/apache/sling/feature/io/json/FeatureJSONWriterTest.java b/src/test/java/org/apache/sling/feature/io/json/FeatureJSONWriterTest.java
index 81db5e6..79609f2 100644
--- a/src/test/java/org/apache/sling/feature/io/json/FeatureJSONWriterTest.java
+++ b/src/test/java/org/apache/sling/feature/io/json/FeatureJSONWriterTest.java
@@ -47,4 +47,17 @@
                 U.findCapability(rf.getCapabilities(), "osgi.service").getAttributes().get("objectClass"));
     }
 
+    @Test public void testExtensionsWriteRead() throws Exception {
+        final Feature f = U.readFeature("artifacts-extension");
+        final Feature rf;
+        try ( final StringWriter writer = new StringWriter() ) {
+            FeatureJSONWriter.write(writer, f);
+            try ( final StringReader reader = new StringReader(writer.toString()) ) {
+                rf = FeatureJSONReader.read(reader, null, SubstituteVariables.RESOLVE);
+            }
+        }
+
+        ArtifactsExtensions.testReadArtifactsExtensions(rf);
+    }
+
 }
diff --git a/src/test/resources/features/artifacts-extension.json b/src/test/resources/features/artifacts-extension.json
new file mode 100644
index 0000000..3bcd47a
--- /dev/null
+++ b/src/test/resources/features/artifacts-extension.json
@@ -0,0 +1,9 @@
+{
+  "id": "test/artifacts-extension/1.0.0",
+  "my-extension1:ARTIFACTS|false":[
+    "org.apache.sling/my-extension1/1.2.3"
+  ],
+  "my-extension2:ARTIFACTS|true":[
+    "org.apache.sling/my-extension2/1.2.3"
+  ]
+}
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