Add getExtensionFactory in PluginManager interface

pf4j/src/main/java/ro/fortsoft/pf4j/DefaultExtensionFinder.java

@@ -43,12 +43,10 @@ public class DefaultExtensionFinder implements ExtensionFinder, PluginStateListe
 	private static final Logger log = LoggerFactory.getLogger(DefaultExtensionFinder.class);
 
     protected PluginManager pluginManager;
-	protected ExtensionFactory extensionFactory;
     protected volatile Map<String, Set<String>> entries; // cache by pluginId
 
-	public DefaultExtensionFinder(PluginManager pluginManager, ExtensionFactory extensionFactory) {
+	public DefaultExtensionFinder(PluginManager pluginManager) {
         this.pluginManager = pluginManager;
-		this.extensionFactory = extensionFactory;
 	}
 
     @Override
@@ -93,7 +91,7 @@ public class DefaultExtensionFinder implements ExtensionFinder, PluginStateListe
                         descriptor.setExtensionClass(extensionClass);
 
                         ExtensionWrapper extensionWrapper = new ExtensionWrapper<>(descriptor);
-                        extensionWrapper.setExtensionFactory(extensionFactory);
+                        extensionWrapper.setExtensionFactory(pluginManager.getExtensionFactory());
                         result.add(extensionWrapper);
                         log.debug("Added extension '{}' with ordinal {}", className, extension.ordinal());
                     } else {

pf4j/src/main/java/ro/fortsoft/pf4j/DefaultPluginManager.java

@@ -566,6 +566,11 @@ public class DefaultPluginManager implements PluginManager {
         return extensionFinder.findClassNames(pluginId);
     }
 
+    @Override
+    public ExtensionFactory getExtensionFactory() {
+        return extensionFactory;
+    }
+
     @Override
 	public RuntimeMode getRuntimeMode() {
     	if (runtimeMode == null) {
@@ -631,7 +636,7 @@ public class DefaultPluginManager implements PluginManager {
      * Add the possibility to override the ExtensionFinder.
      */
     protected ExtensionFinder createExtensionFinder() {
-    	DefaultExtensionFinder extensionFinder = new DefaultExtensionFinder(this, extensionFactory);
+    	DefaultExtensionFinder extensionFinder = new DefaultExtensionFinder(this);
         addPluginStateListener(extensionFinder);
 
         return extensionFinder;

pf4j/src/main/java/ro/fortsoft/pf4j/PluginManager.java

@@ -136,6 +136,8 @@ public interface PluginManager {
 
     public Set<String> getExtensionClassNames(String pluginId);
 
+    public ExtensionFactory getExtensionFactory();
+
     /**
 	 * The runtime mode. Must currently be either DEVELOPMENT or DEPLOYMENT.
 	 */