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rmaucher pushed a commit to branch 10.1.x
in repository https://gitbox.apache.org/repos/asf/tomcat.git

commit 2ccf95d7d6bc3d6cd9882b73c4812fa734734127
Author: opencode <[email protected]>
AuthorDate: Wed Sep 30 13:42:17 2026 +0200

    Retain an existing resource link in NamingResourcesImpl.addEnvironment() 
when the link's global target is not an overridable global environment rather 
than adding an environment entry with the same name which would create a 
duplicate JNDI binding
---
 .../org/apache/catalina/deploy/NamingResourcesImpl.java | 17 +++++++++++------
 1 file changed, 11 insertions(+), 6 deletions(-)

diff --git a/java/org/apache/catalina/deploy/NamingResourcesImpl.java 
b/java/org/apache/catalina/deploy/NamingResourcesImpl.java
index 47f35e95f6..5d035343bf 100644
--- a/java/org/apache/catalina/deploy/NamingResourcesImpl.java
+++ b/java/org/apache/catalina/deploy/NamingResourcesImpl.java
@@ -274,12 +274,17 @@ public class NamingResourcesImpl extends 
LifecycleMBeanBase implements Serializa
                     return;
                 }
                 NamingResourcesImpl global = server.getGlobalNamingResources();
-                if (global.findEnvironment(rl.getGlobal()) != null) {
-                    if (global.findEnvironment(rl.getGlobal()).getOverride()) {
-                        removeResourceLink(environment.getName());
-                    } else {
-                        return;
-                    }
+                ContextEnvironment globalEnv = 
global.findEnvironment(rl.getGlobal());
+                if (globalEnv != null && globalEnv.getOverride()) {
+                    removeResourceLink(environment.getName());
+                } else {
+                    // The link targets a global entry that may not be
+                    // overridden, or something that is not a global
+                    // environment at all (or is missing). In those cases the
+                    // existing link is retained. Adding the environment entry
+                    // as well would result in two entries sharing one JNDI
+                    // name.
+                    return;
                 }
             } else {
                 // It exists but it isn't an env or a res link...


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