From 04235f96ee2816d17d0b27dc34a333c454675d39 Mon Sep 17 00:00:00 2001
From: Junhyeok Lee <jhl221123@naver.com>
Date: Wed, 16 Jul 2025 21:26:03 +0900
Subject: [PATCH 1/2] Correct log message format in
 AbstractDriverManagerConnectionSource

The debug log message in AbstractDriverManagerConnectionSource had 4 placeholders but was supplied with 5 arguments.
This corrects the format string to match the argument count, resolving the warning.

Fixes #3828
---
 .../appender/db/jdbc/AbstractDriverManagerConnectionSource.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/db/jdbc/AbstractDriverManagerConnectionSource.java b/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/db/jdbc/AbstractDriverManagerConnectionSource.java
index 6f46be6bdc5..1facaa157a4 100644
--- a/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/db/jdbc/AbstractDriverManagerConnectionSource.java
+++ b/log4j-core/src/main/java/org/apache/logging/log4j/core/appender/db/jdbc/AbstractDriverManagerConnectionSource.java
@@ -160,7 +160,7 @@ public Connection getConnection() throws SQLException {
             connection = DriverManager.getConnection(actualConnectionString, toString(userName), toString(password));
         }
         LOGGER.debug(
-                "{} acquired connection for '{}': {} ({}{@})",
+                "{} acquired connection for '{}': {} ({}@{})",
                 getClass().getSimpleName(),
                 actualConnectionString,
                 connection,

From 773bcc8c028f252e1a8cb2bc3e2aaf33ef8f295a Mon Sep 17 00:00:00 2001
From: Junhyeok Lee <jhl221123@naver.com>
Date: Fri, 18 Jul 2025 23:41:44 +0900
Subject: [PATCH 2/2] Add changelog entry

---
 .../.2.x.x/3828_fix_log_placeholder_mismatch.xml     | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 src/changelog/.2.x.x/3828_fix_log_placeholder_mismatch.xml

diff --git a/src/changelog/.2.x.x/3828_fix_log_placeholder_mismatch.xml b/src/changelog/.2.x.x/3828_fix_log_placeholder_mismatch.xml
new file mode 100644
index 00000000000..884b93985d9
--- /dev/null
+++ b/src/changelog/.2.x.x/3828_fix_log_placeholder_mismatch.xml
@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns="https://logging.apache.org/xml/ns"
+       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xsi:schemaLocation="
+           https://logging.apache.org/xml/ns
+           https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
+       type="fixed">
+    <issue id="3828" link="https://github.com/apache/logging-log4j2/issues/3828"/>
+    <description format="asciidoc">
+        Corrected an incorrect placeholder count in the AbstractDriverManagerConnectionSource debug log message to prevent unnecessary warnings.
+    </description>
+</entry>