File _service:tar_scm:CVE-2021-30640-pre2.patch of Package tomcat

From 824c531393aa030f161e1ec352a65b7e9302d6b6 Mon Sep 17 00:00:00 2001
From: Mark Thomas <markt@apache.org>
Date: Fri, 26 Jul 2019 14:59:57 +0100
Subject: [PATCH] Fix https://bz.apache.org/bugzilla/show_bug.cgi?id=63550

Only use the alternateURL for the JNDIRealm when it has been specified
---
 java/org/apache/catalina/realm/JNDIRealm.java | 4 ++++
 webapps/docs/changelog.xml                    | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/java/org/apache/catalina/realm/JNDIRealm.java b/java/org/apache/catalina/realm/JNDIRealm.java
index 034c0f0..505dd13 100644
--- a/java/org/apache/catalina/realm/JNDIRealm.java
+++ b/java/org/apache/catalina/realm/JNDIRealm.java
@@ -2378,6 +2378,10 @@ public class JNDIRealm extends RealmBase {
             context = createDirContext(getDirectoryContextEnvironment());
 
         } catch (Exception e) {
+            if (alternateURL == null || alternateURL.length() == 0) {
+                // No alternate URL. Re-throw the exception.
+                throw e;
+            }
 
             connectionAttempt = 1;
 
diff --git a/webapps/docs/changelog.xml b/webapps/docs/changelog.xml
index f088e0d..7bcc3d9 100644
--- a/webapps/docs/changelog.xml
+++ b/webapps/docs/changelog.xml
@@ -248,6 +248,10 @@
   </subsection>
   <subsection name="Jasper">
     <changelog>
+      <fix>
+        <bug>63550</bug>: Only try the <code>alternateURL</code> in the
+        <code>JNDIRealm</code> if one has been specified. (markt)
+      </fix>
       <add>
         <bug>50234</bug>: Add the capability to generate a web-fragment.xml file
         to JspC. (markt)
-- 
2.23.0