From 848d709140ff480c372f1dbef161f84da7eb8329 Mon Sep 17 00:00:00 2001
From: Michael Yang <fuhai999@gmail.com>
Date: Thu, 3 Apr 2025 09:15:33 +0800
Subject: [PATCH] test: add lambada test

---
 .../com/mybatisflex/core/util/LambdaUtil.java |  4 ++++
 .../mybatisflex/core/util/LambdaUtilTest.java | 18 +++++++++++++++
 .../mybatisflex/core/util/TestAccount.java    | 23 +++++++++++++++++++
 3 files changed, 45 insertions(+)
 create mode 100644 mybatis-flex-core/src/test/java/com/mybatisflex/core/util/LambdaUtilTest.java
 create mode 100644 mybatis-flex-core/src/test/java/com/mybatisflex/core/util/TestAccount.java

diff --git a/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/LambdaUtil.java b/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/LambdaUtil.java
index 38005819..62b0d6d1 100644
--- a/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/LambdaUtil.java
+++ b/mybatis-flex-core/src/main/java/com/mybatisflex/core/util/LambdaUtil.java
@@ -35,6 +35,10 @@ public class LambdaUtil {
     private static final Map<Class<?>, Class<?>> implClassMap = new ConcurrentHashMap<>();
     private static final Map<Class<?>, QueryColumn> queryColumnMap = new ConcurrentHashMap<>();
 
+    public static Map<Class<?>, String> getFieldNameMap() {
+        return fieldNameMap;
+    }
+
     public static <T> String getFieldName(LambdaGetter<T> getter) {
         return MapUtil.computeIfAbsent(fieldNameMap, getter.getClass(), aClass -> {
             SerializedLambda lambda = getSerializedLambda(getter);
diff --git a/mybatis-flex-core/src/test/java/com/mybatisflex/core/util/LambdaUtilTest.java b/mybatis-flex-core/src/test/java/com/mybatisflex/core/util/LambdaUtilTest.java
new file mode 100644
index 00000000..dde765ae
--- /dev/null
+++ b/mybatis-flex-core/src/test/java/com/mybatisflex/core/util/LambdaUtilTest.java
@@ -0,0 +1,18 @@
+package com.mybatisflex.core.util;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class LambdaUtilTest {
+
+    @Test
+    public void testIssue516() {
+
+        for (int i = 0; i < 100; i++) {
+            LambdaUtil.getFieldName(TestAccount::getName);
+        }
+
+        Assert.assertEquals(LambdaUtil.getFieldNameMap().size(), 1);
+        System.out.println("testIssue516");
+    }
+}
diff --git a/mybatis-flex-core/src/test/java/com/mybatisflex/core/util/TestAccount.java b/mybatis-flex-core/src/test/java/com/mybatisflex/core/util/TestAccount.java
new file mode 100644
index 00000000..9d7ebbf3
--- /dev/null
+++ b/mybatis-flex-core/src/test/java/com/mybatisflex/core/util/TestAccount.java
@@ -0,0 +1,23 @@
+package com.mybatisflex.core.util;
+
+public class TestAccount {
+
+    private String name;
+    private int age;
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public int getAge() {
+        return age;
+    }
+
+    public void setAge(int age) {
+        this.age = age;
+    }
+}