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-rw-r--r--src/com/vaadin/service/ApplicationContext.java1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/com/vaadin/service/ApplicationContext.java b/src/com/vaadin/service/ApplicationContext.java
index 244e3d1bdf..76685cc215 100644
--- a/src/com/vaadin/service/ApplicationContext.java
+++ b/src/com/vaadin/service/ApplicationContext.java
@@ -54,6 +54,7 @@ public interface ApplicationContext extends Serializable {
* called before and after each each request related to this session except
* when serving static resources.
*
+ * The transaction listener must not be null.
*
* @see com.vaadin.service.ApplicationContext#addTransactionListener(com.vaadin.service.ApplicationContext.TransactionListener)
*/