From 337ae879772b1fb950f851b7bafbc89b6293cc85 Mon Sep 17 00:00:00 2001
From: Diane Holt <holtdl@apache.org>
Date: Wed, 29 May 2002 22:43:01 +0000
Subject: [PATCH] Avoid getting an NPE by making sure the property attr is set.

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@272810 13f79535-47bb-0310-9956-ffa450edef68
---
 src/main/org/apache/tools/ant/taskdefs/UpToDate.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/main/org/apache/tools/ant/taskdefs/UpToDate.java b/src/main/org/apache/tools/ant/taskdefs/UpToDate.java
index 59dd30c34..0afd81860 100644
--- a/src/main/org/apache/tools/ant/taskdefs/UpToDate.java
+++ b/src/main/org/apache/tools/ant/taskdefs/UpToDate.java
@@ -223,6 +223,10 @@ public class UpToDate extends Task implements Condition {
      * than (each of) the corresponding source file(s).
      */
     public void execute() throws BuildException {
+        if (_property == null) {
+            throw new BuildException("property attribute is required.", 
+                                     location);
+        }
         boolean upToDate = eval();
         if (upToDate) {
             this.project.setNewProperty(_property, getValue());