diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/datasource/DataSourceKey.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/datasource/DataSourceKey.java
index dbb65038..122271ee 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/datasource/DataSourceKey.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/datasource/DataSourceKey.java
@@ -34,9 +34,11 @@ public class DataSourceKey {
 
     public static void use(String dataSourceKey) {
         Deque<String> deque = lookup.get();
-        if (deque != null) {
-            deque.push(dataSourceKey);
+        if (deque == null) {
+            deque = new ArrayDeque<>(1);
+            lookup.set(deque);
         }
+        deque.push(dataSourceKey);
     }
 
     public static String get() {
@@ -95,31 +97,4 @@ public class DataSourceKey {
         return shardingDsKey != null ? shardingDsKey : dataSource;
     }
 
-    // === For Removal ===
-
-    @Deprecated
-    public static String getByManual() {
-        throw new UnsupportedOperationException("使用 DataSource.get() 代替。");
-    }
-
-    @Deprecated
-    public static String getByAnnotation() {
-        throw new UnsupportedOperationException("使用 DataSource.get() 代替。");
-    }
-
-    @Deprecated
-    public static void useWithAnnotation(String dataSourceKey) {
-        throw new UnsupportedOperationException("使用 DataSource.use(String) 代替。");
-    }
-
-    @Deprecated
-    public static void setAnnotationKeyThreadLocal(ThreadLocal<String> annotationKeyThreadLocal) {
-        throw new UnsupportedOperationException("使用 DataSource.setThreadLocal(ThreadLocal<Deque<String>>) 代替。");
-    }
-
-    @Deprecated
-    public static void setManualKeyThreadLocal(ThreadLocal<String> manualKeyThreadLocal) {
-        throw new UnsupportedOperationException("使用 DataSource.setThreadLocal(ThreadLocal<Deque<String>>) 代替。");
-    }
-
 }