Use StringBuilder instead of StringBuffer.
diff --git a/src/main/java/org/apache/commons/dbutils/AbstractQueryRunner.java b/src/main/java/org/apache/commons/dbutils/AbstractQueryRunner.java
index a284637..8415173 100644
--- a/src/main/java/org/apache/commons/dbutils/AbstractQueryRunner.java
+++ b/src/main/java/org/apache/commons/dbutils/AbstractQueryRunner.java
@@ -586,7 +586,7 @@
         if (causeMessage == null) {
             causeMessage = "";
         }
-        final StringBuffer msg = new StringBuffer(causeMessage);
+        final StringBuilder msg = new StringBuilder(causeMessage);
 
         msg.append(" Query: ");
         msg.append(sql);