From c10e9bc60caab66143f271a968d1b6a3babb615d Mon Sep 17 00:00:00 2001
From: GunoH <GunoH@users.noreply.github.com>
Date: Tue, 10 Mar 2020 16:46:44 +0100
Subject: [PATCH] Improve annotation processor error messages (#370)

---
 .../org/pf4j/processor/ExtensionAnnotationProcessor.java    | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/pf4j/src/main/java/org/pf4j/processor/ExtensionAnnotationProcessor.java b/pf4j/src/main/java/org/pf4j/processor/ExtensionAnnotationProcessor.java
index 797fe04..a5f82b0 100644
--- a/pf4j/src/main/java/org/pf4j/processor/ExtensionAnnotationProcessor.java
+++ b/pf4j/src/main/java/org/pf4j/processor/ExtensionAnnotationProcessor.java
@@ -239,11 +239,13 @@ public class ExtensionAnnotationProcessor extends AbstractProcessor {
             // pickup the first interface
             if (extensionPointElements.isEmpty() && ignoreExtensionPoint) {
                 if (interfaces.isEmpty()) {
-                    error(extensionElement, "%s is not an extension (it doesn't implement any interface)", extensionElement);
+                    error(extensionElement, "Cannot use %s as extension point with %s compiler arg (it doesn't implement any interface)",
+                        extensionElement, IGNORE_EXTENSION_POINT);
                 } else if (interfaces.size() == 1) {
                     extensionPointElements.add(getElement(interfaces.get(0)));
                 } else {
-                    error(extensionElement, "%s is not an extension (it implements multiple interfaces)", extensionElement);
+                    error(extensionElement, "Cannot use %s as extension point with %s compiler arg (it implements multiple interfaces)",
+                        extensionElement, IGNORE_EXTENSION_POINT);
                 }
             }
         }
-- 
2.39.5