From dbfa4cf3f31a9decff2c463494f32ff8f3126f29 Mon Sep 17 00:00:00 2001
From: Martín López <mlopez@flowingcode.com>
Date: Fri, 8 May 2020 13:50:20 -0300
Subject: Fixed a problem with example code in article "Letting The User
 Download A File" (#11971)

Fixes #10580
---
 documentation/articles/LettingTheUserDownloadAFile.asciidoc | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

(limited to 'documentation')

diff --git a/documentation/articles/LettingTheUserDownloadAFile.asciidoc b/documentation/articles/LettingTheUserDownloadAFile.asciidoc
index f977b07956..1ede8bd5c0 100644
--- a/documentation/articles/LettingTheUserDownloadAFile.asciidoc
+++ b/documentation/articles/LettingTheUserDownloadAFile.asciidoc
@@ -104,8 +104,15 @@ public class OnDemandFileDownloader extends FileDownloader {
     return super.handleConnectorRequest(request, response, path);
   }
 
-  private StreamResource getResource () {
-    return (StreamResource) this.getResource("dl");
+  private StreamResource getResource() {
+    StreamResource result = null;
+    this.getSession().lock();
+    try {
+      result = (StreamResource) this.getResource("dl");
+    } finally {
+      this.getSession().unlock();
+    }
+    return result;
   }
 }
 ....
-- 
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