Make `PluginStateEvent` fields `final` (#566)

diff --git a/pf4j/src/main/java/org/pf4j/PluginStateEvent.java b/pf4j/src/main/java/org/pf4j/PluginStateEvent.java
index 99ef91ccfd4c32dcb72d63d9613b894f941a7844..8793abe9c10cd85b388db8cbeac4e81e879dfed7 100644 (file)
--- a/pf4j/src/main/java/org/pf4j/PluginStateEvent.java
+++ b/pf4j/src/main/java/org/pf4j/PluginStateEvent.java
@@ -28,8 +28,8 @@ import java.util.EventObject;
  */
 public class PluginStateEvent extends EventObject {
 
-    private PluginWrapper plugin;
-    private PluginState oldState;
+    private final PluginWrapper plugin;
+    private final PluginState oldState;
 
     public PluginStateEvent(PluginManager source, PluginWrapper plugin, PluginState oldState) {
         super(source);