fix compiler warning in JavaIdClassReference
diff --git a/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/context/java/JavaIdClassReference.java b/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/context/java/JavaIdClassReference.java
index 75559cb..1775f50 100644
--- a/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/context/java/JavaIdClassReference.java
+++ b/jpa/plugins/org.eclipse.jpt.jpa.core/src/org/eclipse/jpt/jpa/core/context/java/JavaIdClassReference.java
@@ -27,4 +27,5 @@
 public interface JavaIdClassReference
 	extends IdClassReference
 {
+	// nothing yet
 }