Adding possibility to reload the plugins

src/main/java/org/owasp/webgoat/plugins/PluginBackgroundLoader.java

@@ -0,0 +1,27 @@
+package org.owasp.webgoat.plugins;
+
+import javax.servlet.ServletContextEvent;
+import javax.servlet.ServletContextListener;
+import javax.servlet.annotation.WebListener;
+import java.nio.file.Paths;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+@WebListener
+public class PluginBackgroundLoader implements ServletContextListener {
+
+    private ScheduledExecutorService scheduler;
+
+    @Override
+    public void contextInitialized(ServletContextEvent event) {
+        String pluginPath = event.getServletContext().getRealPath("plugin_lessons");
+        scheduler = Executors.newSingleThreadScheduledExecutor();
+        scheduler.scheduleAtFixedRate(new PluginsLoader(Paths.get(pluginPath)), 0, 5, TimeUnit.SECONDS);
+    }
+
+    @Override
+    public void contextDestroyed(ServletContextEvent event) {
+        scheduler.shutdownNow();
+    }
+}

src/main/java/org/owasp/webgoat/plugins/PluginsLoader.java

@@ -12,7 +12,7 @@ import java.nio.file.attribute.BasicFileAttributes;
 import java.util.ArrayList;
 import java.util.List;
 
-public class PluginsLoader {
+public class PluginsLoader implements Runnable {
 
     private final Logger logger = LoggerFactory.getLogger(this.getClass());
     private final Path path;
@@ -49,4 +49,8 @@ public class PluginsLoader {
     }
 
 
+    @Override
+    public void run() {
+        loadPlugins();
+    }
 }