Add 'NagException' to disclose plugin fail

By: Erik Broes <erikbroes@grum.nl>

paper-api/src/main/java/org/bukkit/plugin/AuthorNagException.java

@@ -0,0 +1,20 @@
+package org.bukkit.plugin;
+
+public class AuthorNagException extends RuntimeException {
+    private final String message;
+
+    /**
+     * Constructs a new UnknownDependencyException based on the given Exception
+     *
+     * @param message Brief message explaining the cause of the exception
+     * @param throwable Exception that triggered this Exception
+     */
+    public AuthorNagException(final String message) {
+        this.message = message;
+    }
+
+    @Override
+    public String getMessage() {
+        return message;
+    }
+}

paper-api/src/main/java/org/bukkit/plugin/SimplePluginManager.java

@@ -253,6 +253,13 @@ public final class SimplePluginManager implements PluginManager {
             for (RegisteredListener registration : eventListeners) {
                 try {
                     registration.callEvent( event );
+                } catch (AuthorNagException ex) {
+                    server.getLogger().log(Level.SEVERE, String.format(
+                        "Nag author: %s of %s about the following:",
+                        registration.getPlugin().getDescription().getAuthors().get(0),
+                        registration.getPlugin().getDescription().getName(),
+                        ex.getMessage()
+                    ));
                 } catch (Throwable ex) {
                     server.getLogger().log(Level.SEVERE, "Could not pass event " + event.getType() + " to " + registration.getPlugin().getDescription().getName(), ex);
                 }