From 9f032fed5aa2c69889c8923dc4f3c8e5bb552253 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Timo=20Westk=C3=A4mper?= <timo.westkamper@mysema.com>
Date: Sun, 7 Oct 2012 12:40:20 +0300
Subject: [PATCH] added check for rootElements existence

---
 .../java/com/mysema/query/apt/AbstractQuerydslProcessor.java | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/querydsl-apt/src/main/java/com/mysema/query/apt/AbstractQuerydslProcessor.java b/querydsl-apt/src/main/java/com/mysema/query/apt/AbstractQuerydslProcessor.java
index eb8b26ee6..eede39a34 100644
--- a/querydsl-apt/src/main/java/com/mysema/query/apt/AbstractQuerydslProcessor.java
+++ b/querydsl-apt/src/main/java/com/mysema/query/apt/AbstractQuerydslProcessor.java
@@ -95,6 +95,11 @@ public abstract class AbstractQuerydslProcessor extends AbstractProcessor {
             return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
         }
         
+        if (roundEnv.getRootElements() == null || roundEnv.getRootElements().isEmpty()) {
+            processingEnv.getMessager().printMessage(Diagnostic.Kind.NOTE, "No sources to process");
+            return ALLOW_OTHER_PROCESSORS_TO_CLAIM_ANNOTATIONS;
+        }
+        
         conf = createConfiguration(roundEnv);
         context = new Context();        
         Set<Class<? extends Annotation>> entityAnnotations = conf.getEntityAnnotations();