diff --git a/CONTRIBUTORS b/CONTRIBUTORS
index 86d51dfe2..d6fbc9158 100644
--- a/CONTRIBUTORS
+++ b/CONTRIBUTORS
@@ -353,6 +353,7 @@ Victor Toni
 Vincent Legoll
 Waldek Herka
 Will Wang
+William Bernardet
 William Ferguson
 William Webber
 Wolf Siberski
diff --git a/WHATSNEW b/WHATSNEW
index 317f0285b..08823b846 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -44,6 +44,9 @@ Fixed bugs:
    It will now fail with a more useful error message.
    Bugzilla Report 51035.
 
+ * Exec task may mix the stderr and stdout output while logging it
+   Bugzilla Report 50507.   
+
 Other changes:
 --------------
 
@@ -62,7 +65,7 @@ Other changes:
  * The expandproperties filter now accepts a nested propertyset
    which, if specified, provides the properties for expansion.
    Bugzilla Report 51044.
-
+   
 Changes from Ant 1.8.1 TO Ant 1.8.2
 ===================================
 
diff --git a/contributors.xml b/contributors.xml
index 6bb5aed5d..b0d02c8a2 100644
--- a/contributors.xml
+++ b/contributors.xml
@@ -1424,6 +1424,10 @@
     <first>Will</first>
     <last>Wang</last>
   </name>
+  <name>
+    <first>William</first>
+    <last>Bernardet</last>
+  </name>
   <name>
     <first>William</first>
     <last>Ferguson</last>
diff --git a/src/main/org/apache/tools/ant/taskdefs/Redirector.java b/src/main/org/apache/tools/ant/taskdefs/Redirector.java
index 6e3e28a99..70fcb27f6 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Redirector.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Redirector.java
@@ -37,6 +37,8 @@ import org.apache.tools.ant.ProjectComponent;
 import org.apache.tools.ant.Task;
 import org.apache.tools.ant.BuildException;
 import org.apache.tools.ant.filters.util.ChainReaderHelper;
+import org.apache.tools.ant.util.LineOrientedOutputStream;
+import org.apache.tools.ant.util.LineOrientedOutputStreamRedirector;
 import org.apache.tools.ant.util.StringUtils;
 import org.apache.tools.ant.util.TeeOutputStream;
 import org.apache.tools.ant.util.ReaderInputStream;
@@ -720,8 +722,8 @@ public class Redirector {
             OutputStreamFunneler funneler = new OutputStreamFunneler(
                     outputStream, funnelTimeout);
             try {
-                outputStream = funneler.getFunnelInstance();
-                errorStream = funneler.getFunnelInstance();
+                outputStream = new LineOrientedOutputStreamRedirector(funneler.getFunnelInstance());
+                errorStream = new LineOrientedOutputStreamRedirector(funneler.getFunnelInstance());
             } catch (IOException eyeOhEx) {
                 throw new BuildException(
                         "error splitting output/error streams", eyeOhEx);
diff --git a/src/main/org/apache/tools/ant/util/LineOrientedOutputStream.java b/src/main/org/apache/tools/ant/util/LineOrientedOutputStream.java
index 30e5d88b9..6f15defc1 100644
--- a/src/main/org/apache/tools/ant/util/LineOrientedOutputStream.java
+++ b/src/main/org/apache/tools/ant/util/LineOrientedOutputStream.java
@@ -66,10 +66,7 @@ public abstract class LineOrientedOutputStream extends OutputStream {
      * Flush this log stream
      * @throws IOException if there is an error.
      */
-    public final void flush() throws IOException {
-        if (buffer.size() > 0) {
-            processBuffer();
-        }
+    public void flush() throws IOException {
     }
 
     /**
@@ -97,7 +94,7 @@ public abstract class LineOrientedOutputStream extends OutputStream {
      * Writes all remaining
      * @throws IOException if there is an error.
      */
-    public final void close() throws IOException {
+    public void close() throws IOException {
         if (buffer.size() > 0) {
             processBuffer();
         }
diff --git a/src/main/org/apache/tools/ant/util/LineOrientedOutputStreamRedirector.java b/src/main/org/apache/tools/ant/util/LineOrientedOutputStreamRedirector.java
new file mode 100644
index 000000000..b703e43a6
--- /dev/null
+++ b/src/main/org/apache/tools/ant/util/LineOrientedOutputStreamRedirector.java
@@ -0,0 +1,48 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ */
+package org.apache.tools.ant.util;
+
+import java.io.IOException;
+import java.io.OutputStream;
+/**
+ * provide a concrete implementation of LineOrientedOutputStream
+ * @since Ant 1.8.3
+ *
+ */
+public class LineOrientedOutputStreamRedirector
+        extends
+            LineOrientedOutputStream {
+    private OutputStream stream;
+    public LineOrientedOutputStreamRedirector(OutputStream stream) {
+        this.stream = stream;
+    }
+    
+    protected void processLine(String line) throws IOException {
+        stream.write((line + System.getProperty("line.separator")).getBytes());
+    }
+    
+    public void close() throws IOException {
+        super.close();
+        stream.close();
+    }
+
+    public void flush() throws IOException {
+        super.flush();
+        stream.flush();
+    }
+}