Ensure that Smack is initialized when calling ProviderManager

smack-core/src/main/java/org/jivesoftware/smack/provider/ProviderManager.java

@@ -22,6 +22,7 @@ import java.util.Collections;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+import org.jivesoftware.smack.SmackConfiguration;
 import org.jivesoftware.smack.packet.IQ;
 import org.jxmpp.util.XmppStringUtils;
 
@@ -110,6 +111,14 @@ public final class ProviderManager {
     private static final Map<String, Object> iqProviders = new ConcurrentHashMap<String, Object>();
     private static final Map<String, StreamFeatureProvider> streamFeatureProviders = new ConcurrentHashMap<String, StreamFeatureProvider>();
 
+    static {
+        // Ensure that Smack is initialized by calling getVersion, so that user
+        // registered providers do not get overwritten by a following Smack
+        // initialization. This guarantees that Smack is initialized before a
+        // new provider is registered
+        SmackConfiguration.getVersion();
+    }
+
     public static void addLoader(ProviderLoader loader) {
         if (loader.getIQProviderInfo() != null) {
             for (IQProviderInfo info : loader.getIQProviderInfo()) {

smack-core/src/test/java/org/jivesoftware/smack/provider/ProviderManagerTest.java

@@ -0,0 +1,45 @@
+/**
+ *
+ * Copyright © 2014 Florian Schmaus
+ *
+ * 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.
+ */
+package org.jivesoftware.smack.provider;
+
+import static org.junit.Assert.assertTrue;
+
+import org.jivesoftware.smack.SmackConfiguration;
+import org.jivesoftware.smack.packet.IQ;
+import org.junit.Test;
+import org.xmlpull.v1.XmlPullParser;
+
+public class ProviderManagerTest {
+
+    /**
+     * This test should be run in a clean (e.g. forked) VM
+     */
+    @Test
+    public void shouldInitializeSmackTest() throws Exception{
+        ProviderManager.addIQProvider("foo", "bar", new TestIQProvider());
+        assertTrue(SmackConfiguration.isSmackInitialized());
+    }
+
+    public static class TestIQProvider implements IQProvider {
+
+        @Override
+        public IQ parseIQ(XmlPullParser parser) throws Exception {
+            return null;
+        }
+
+    }
+}