Delay pf4j instantiation and setup to start()

src/main/java/com/gitblit/manager/PluginManager.java

diff --git a/src/main/java/com/gitblit/manager/PluginManager.java b/src/main/java/com/gitblit/manager/PluginManager.java
index dcf12b2..a35ff6f 100644
--- a/src/main/java/com/gitblit/manager/PluginManager.java
+++ b/src/main/java/com/gitblit/manager/PluginManager.java
@@ -75,10 +75,10 @@
 
 	private final Logger logger = LoggerFactory.getLogger(getClass());
 
-	private final DefaultPluginManager pf4j;
-
 	private final IRuntimeManager runtimeManager;
 
+	private DefaultPluginManager pf4j;
+
 	// timeout defaults of Maven 3.0.4 in seconds
 	private int connectTimeout = 20;
 
@@ -86,18 +86,7 @@
 
 	@Inject
 	public PluginManager(IRuntimeManager runtimeManager) {
-		File dir = runtimeManager.getFileOrFolder(Keys.plugins.folder, "${baseFolder}/plugins");
-		dir.mkdirs();
 		this.runtimeManager = runtimeManager;
-
-		this.pf4j = new DefaultPluginManager(dir);
-
-		try {
-			Version systemVersion = Version.createVersion(Constants.getVersion());
-			pf4j.setSystemVersion(systemVersion);
-		} catch (Exception e) {
-			logger.error(null, e);
-		}
 	}
 
 	@Override
@@ -112,6 +101,16 @@
 
 	@Override
 	public PluginManager start() {
+		File dir = runtimeManager.getFileOrFolder(Keys.plugins.folder, "${baseFolder}/plugins");
+		dir.mkdirs();
+		pf4j = new DefaultPluginManager(dir);
+
+		try {
+			Version systemVersion = Version.createVersion(Constants.getVersion());
+			pf4j.setSystemVersion(systemVersion);
+		} catch (Exception e) {
+			logger.error(null, e);
+		}
 		pf4j.loadPlugins();
 		logger.debug("Starting plugins");
 		pf4j.startPlugins();