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garydgregory pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/commons-configuration.git

commit dc33cda1600a24fa31649a23b07a0dec94e12a48
Author: Gary Gregory <[email protected]>
AuthorDate: Sat Aug 22 11:40:35 2026 -0400

    Fix SpotBugs USO_UNSAFE_METHOD_SYNCHRONIZATION in
    ReloadingCombinedConfigurationBuilder.
---
 src/changes/changes.xml                                     |  1 +
 .../combined/ReloadingCombinedConfigurationBuilder.java     | 13 +++++++++----
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/changes/changes.xml b/src/changes/changes.xml
index fac3b9088..1eb77ed1e 100644
--- a/src/changes/changes.xml
+++ b/src/changes/changes.xml
@@ -30,6 +30,7 @@
       <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix SpotBugs 
USO_UNSAFE_METHOD_SYNCHRONIZATION in CombinedConfigurationBuilder.</action>
       <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix SpotBugs 
USO_UNSAFE_METHOD_SYNCHRONIZATION in FileBasedConfigurationBuilder.</action>
       <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix SpotBugs 
USO_UNSAFE_METHOD_SYNCHRONIZATION in MultiFileConfigurationBuilder.</action>
+      <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix SpotBugs 
USO_UNSAFE_METHOD_SYNCHRONIZATION in 
ReloadingCombinedConfigurationBuilder.</action>
       <!-- ADD -->
       <!-- UPDATE -->
       <action type="update" dev="ggregory" due-to="Gary Gregory">Bump 
org.apache.commons:commons-parent from 100 to 103.</action>
diff --git 
a/src/main/java/org/apache/commons/configuration2/builder/combined/ReloadingCombinedConfigurationBuilder.java
 
b/src/main/java/org/apache/commons/configuration2/builder/combined/ReloadingCombinedConfigurationBuilder.java
index fbe868a4e..fc08defa6 100644
--- 
a/src/main/java/org/apache/commons/configuration2/builder/combined/ReloadingCombinedConfigurationBuilder.java
+++ 
b/src/main/java/org/apache/commons/configuration2/builder/combined/ReloadingCombinedConfigurationBuilder.java
@@ -70,6 +70,11 @@ public class ReloadingCombinedConfigurationBuilder extends 
CombinedConfiguration
     /** The reloading controller used by this builder. */
     private ReloadingController reloadingController;
 
+    /**
+     * A lock object for synchronizing access.
+     */
+    private final Object lock = new Object();
+
     /**
      * Creates a new instance of {@code 
ReloadingCombinedConfigurationBuilder}. No parameters are set.
      */
@@ -118,9 +123,7 @@ public class ReloadingCombinedConfigurationBuilder extends 
CombinedConfiguration
         final Collection<ReloadingController> subControllers = new 
LinkedList<>();
         final ConfigurationBuilder<? extends HierarchicalConfiguration<?>> 
defBuilder = getDefinitionBuilder();
         obtainReloadingController(subControllers, defBuilder);
-
         getChildBuilders().forEach(b -> 
obtainReloadingController(subControllers, b));
-
         final CombinedReloadingController ctrl = new 
CombinedReloadingController(subControllers);
         ctrl.resetInitialReloadingState();
         return ctrl;
@@ -154,8 +157,10 @@ public class ReloadingCombinedConfigurationBuilder extends 
CombinedConfiguration
      * meaningful result before.
      */
     @Override
-    public synchronized ReloadingController getReloadingController() {
-        return reloadingController;
+    public ReloadingController getReloadingController() {
+        synchronized (lock) {
+            return reloadingController;
+        }
     }
 
     /**

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