1 files changed, 7 insertions, 0 deletions
diff --git a/libjava/java/nio/ByteBufferImpl.java b/libjava/java/nio/ByteBufferImpl.java
index b1e6b1f..d9f2462 100644
--- a/libjava/java/nio/ByteBufferImpl.java
+++ b/libjava/java/nio/ByteBufferImpl.java
@@ -112,6 +112,8 @@ final class ByteBufferImpl extends ByteBuffer
 
   public ByteBuffer compact ()
   {
+    checkIfReadOnly();
+    mark = -1;
     int pos = position();
     if (pos > 0)
       {
@@ -120,6 +122,11 @@ final class ByteBufferImpl extends ByteBuffer
 	position(count);
 	limit(capacity());
       }
+    else
+      {
+	position(limit());
+	limit(capacity());
+      }
     return this;
   }