쓰레드로컬의 데이터 비우는 조건 추가

jdbc/src/main/java/org/springframework/transaction/support/TransactionSynchronizationManager.java

@@ -31,7 +31,9 @@ public static void bindResource(DataSource key, Connection value) {
     public static Connection unbindResource(DataSource key) {
         Map<DataSource, Connection> dataSourceConnectionMap = resources.get();
         Connection remove = dataSourceConnectionMap.remove(key);
-        resources.remove();
+        if (dataSourceConnectionMap.isEmpty()) {
+            resources.remove();
+        }
         return remove;
     }
 }