diff options
Diffstat (limited to 'libjava/classpath/java/util/Observable.java')
| -rw-r--r-- | libjava/classpath/java/util/Observable.java | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/libjava/classpath/java/util/Observable.java b/libjava/classpath/java/util/Observable.java index 4c2cddb5496..916abe4ac53 100644 --- a/libjava/classpath/java/util/Observable.java +++ b/libjava/classpath/java/util/Observable.java @@ -77,6 +77,8 @@ public class Observable */ public synchronized void addObserver(Observer observer) { + if (observer == null) + throw new NullPointerException("can't add null observer"); observers.add(observer); } |
