diff --git a/src/main/java/com/alibaba/excel/write/ExcelBuilderImpl.java b/src/main/java/com/alibaba/excel/write/ExcelBuilderImpl.java
index 9658f55..59f78bf 100644
--- a/src/main/java/com/alibaba/excel/write/ExcelBuilderImpl.java
+++ b/src/main/java/com/alibaba/excel/write/ExcelBuilderImpl.java
@@ -25,10 +25,13 @@ public class ExcelBuilderImpl implements ExcelBuilder {
     private ExcelWriteFillExecutor excelWriteFillExecutor;
     private ExcelWriteAddExecutor excelWriteAddExecutor;
 
+    static {
+        // Create temporary cache directory at initialization time to avoid POI concurrent write bugs
+        FileUtils.createPoiFilesDirectory();
+    }
+
     public ExcelBuilderImpl(WriteWorkbook writeWorkbook) {
         try {
-            // Create temporary cache directory at initialization time to avoid POI concurrent write bugs
-            FileUtils.createPoiFilesDirectory();
             context = new WriteContextImpl(writeWorkbook);
         } catch (RuntimeException e) {
             finishOnException();
diff --git a/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java b/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java
index 3e27bd3..7b7d6b3 100644
--- a/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java
+++ b/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java
@@ -73,6 +73,8 @@ public class WriteTest {
      * 2. 根据自己或者排除自己需要的列
      * <p>
      * 3. 直接写即可
+     *
+     * @since 2.1.1
      */
     @Test
     public void excludeOrIncludeWrite() {
diff --git a/src/test/java/com/alibaba/easyexcel/test/temp/read/HeadReadTest.java b/src/test/java/com/alibaba/easyexcel/test/temp/read/HeadReadTest.java
index 5127f72..b046d14 100644
--- a/src/test/java/com/alibaba/easyexcel/test/temp/read/HeadReadTest.java
+++ b/src/test/java/com/alibaba/easyexcel/test/temp/read/HeadReadTest.java
@@ -8,6 +8,7 @@ import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
 import com.alibaba.excel.EasyExcel;
+import com.alibaba.excel.cache.Ehcache;
 
 /**
  * 临时测试
@@ -25,4 +26,15 @@ public class HeadReadTest {
 
     }
 
+    @Test
+    public void testCache() throws Exception {
+        File file = new File("D:\\test\\headt1.xls");
+        EasyExcel.read(file, HeadReadData.class, new HDListener()).readCache(new Ehcache(20)).sheet(0).doRead();
+
+        LOGGER.info("------------------");
+        EasyExcel.read(file, HeadReadData.class, new HDListener()).readCache(new Ehcache(20)).sheet(0).doRead();
+        LOGGER.info("------------------");
+        EasyExcel.read(file, HeadReadData.class, new HDListener()).readCache(new Ehcache(20)).sheet(0).doRead();
+    }
+
 }
diff --git a/update.md b/update.md
index 9bd246e..eaaed2b 100644
--- a/update.md
+++ b/update.md
@@ -1,3 +1,5 @@
+# 2.1.2
+
 # 2.1.1
 * 发布正式版
 * 修改map返回为LinkedHashMap
@@ -61,7 +63,7 @@
 * 修复监听器转换异常会重复提示的bug
 
 # 2.0.1
-* 降级poi为3.1.7 兼容jdk6
+* 降级poi为3.17 兼容jdk6
 
 # 2.0.0
 * 修复当cell为空可能会抛出空指针的bug