fix close

CHANGELOG.md

@@ -12,6 +12,7 @@
 ### 🐞Bug修复
 * 【extra  】    修复TinyPinyinEngine空构造造成可能的误判问题
 * 【http   】    修复在gzip模式下Content-Length服务端设置异常导致的阶段
+* 【db     】    修复PooledDataSource关闭逻辑错误问题
 
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hutool-db/src/main/java/cn/hutool/db/ds/pooled/PooledDataSource.java

@@ -147,11 +147,9 @@ public class PooledDataSource extends AbstractDataSource {
 	@Override
 	synchronized public void close() {
 		if (CollectionUtil.isNotEmpty(this.freePool)) {
-			for (PooledConnection pooledConnection : freePool) {
-				pooledConnection.release();
-				this.freePool.clear();
-				this.freePool = null;
-			}
+			this.freePool.forEach(PooledConnection::release);
+			this.freePool.clear();
+			this.freePool = null;
 		}
 	}