From 3199b5f043ad533429b7834ce06e9d4129e6b596 Mon Sep 17 00:00:00 2001
From: Decebal Suiu <decebal.suiu@gmail.com>
Date: Mon, 15 Apr 2019 20:28:30 +0300
Subject: [PATCH] Resolve #309

---
 pf4j/src/main/java/org/pf4j/AbstractPluginManager.java | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java b/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java
index 33130a3..3833588 100644
--- a/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java
+++ b/pf4j/src/main/java/org/pf4j/AbstractPluginManager.java
@@ -287,19 +287,25 @@ public abstract class AbstractPluginManager implements PluginManager {
         checkPluginId(pluginId);
 
         PluginWrapper pluginWrapper = getPlugin(pluginId);
+        // stop the plugin if it's started
         PluginState pluginState = stopPlugin(pluginId);
         if (PluginState.STARTED == pluginState) {
             log.error("Failed to stop plugin '{}' on delete", pluginId);
             return false;
         }
 
+        // get an instance of plugin before the plugin is unloaded
+        // for reason see https://github.com/pf4j/pf4j/issues/309
+        Plugin plugin = pluginWrapper.getPlugin();
+
         if (!unloadPlugin(pluginId)) {
             log.error("Failed to unload plugin '{}' on delete", pluginId);
             return false;
         }
 
+        // notify the plugin as it's deleted
         try {
-            pluginWrapper.getPlugin().delete();
+            plugin.delete();
         } catch (PluginException e) {
             log.error(e.getMessage(), e);
             return false;