MULE-8420: FileMessageDispatcher return subfolders when no files found

transports/file/src/main/java/org/mule/transport/file/FileMessageDispatcher.java

@@ -134,7 +134,7 @@ else if (filter instanceof FilenameFilter)
                     }
                     if (files.length > 0)
                     {
-                        result = files[0];
+                        result = getFirstFile(files);
                     }
                 }
             }
@@ -146,6 +146,19 @@ else if (filter instanceof FilenameFilter)
         }
     }
 
+    private static File getFirstFile(File[] files)
+    {
+        for (File file : files)
+        {
+            if (file.isFile())
+            {
+                return  file;
+            }
+        }
+
+        return null;
+    }
+
     @Override
     protected MuleMessage doSend(MuleEvent event) throws Exception
     {

transports/file/src/test/java/org/mule/transport/file/RecursiveWorkDirectoryTestCase.java

@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
+ * The software in this package is published under the terms of the CPAL v1.0
+ * license, a copy of which has been included with this distribution in the
+ * LICENSE.txt file.
+ */
+
+package org.mule.transport.file;
+
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.nullValue;
+import static org.junit.Assert.assertThat;
+import org.mule.api.MuleMessage;
+import org.mule.api.client.MuleClient;
+import org.mule.tck.junit4.FunctionalTestCase;
+import org.mule.tck.junit4.rule.SystemPropertyTemporaryFolder;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+public class RecursiveWorkDirectoryTestCase extends FunctionalTestCase
+{
+
+    @Rule
+    public SystemPropertyTemporaryFolder temporaryFolder = new SystemPropertyTemporaryFolder("temp");
+
+
+    @Override
+    protected String getConfigFile()
+    {
+        return  "recursive-work-directory-config.xml";
+    }
+
+    @Test
+    public void ignoresWorkDirectoryOnRequest() throws Exception
+    {
+        MuleClient client = muleContext.getClient();
+
+        MuleMessage response = client.request("file://" + temporaryFolder.getRoot(), RECEIVE_TIMEOUT);
+
+        assertThat(response, is(nullValue()));
+    }
+}

transports/file/src/test/resources/recursive-work-directory-config.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<mule
+      xmlns:file="http://www.mulesoft.org/schema/mule/file"
+      xmlns="http://www.mulesoft.org/schema/mule/core"
+      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+      xsi:schemaLocation="
+            http://www.mulesoft.org/schema/mule/core http://www.mulesoft.org/schema/mule/core/current/mule.xsd
+            http://www.mulesoft.org/schema/mule/file http://www.mulesoft.org/schema/mule/file/current/mule-file.xsd">
+
+    <file:connector name="fileConnector" autoDelete="true" streaming="true" validateConnections="true" workDirectory="${temp}/work" recursive="true"/>
+
+    <flow name="main" >
+        <file:inbound-endpoint path="${temp}" pollingFrequency="1000"/>
+
+        <echo-component/>
+    </flow>
+</mule>