fix: 解决 springboot jar 内解析 lambda 表达式出错的问题

mybatis-plus-core/src/main/java/com/baomidou/mybatisplus/core/toolkit/support/SerializedLambda.java

@@ -18,6 +18,7 @@ package com.baomidou.mybatisplus.core.toolkit.support;
 import com.baomidou.mybatisplus.core.toolkit.ClassUtils;
 import com.baomidou.mybatisplus.core.toolkit.ExceptionUtils;
 import com.baomidou.mybatisplus.core.toolkit.SerializationUtils;
+import sun.reflect.Reflection;
 
 import java.io.*;
 
@@ -57,8 +58,17 @@ public class SerializedLambda implements Serializable {
         }
         try (ObjectInputStream objIn = new ObjectInputStream(new ByteArrayInputStream(SerializationUtils.serialize(lambda))) {
             @Override
-            protected Class<?> resolveClass(ObjectStreamClass objectStreamClass) throws IOException, ClassNotFoundException {
-                Class<?> clazz = super.resolveClass(objectStreamClass);
+            protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
+                Class<?> clazz;
+                try {
+                    clazz = super.resolveClass(desc);
+                } catch (ClassNotFoundException e) {
+                    // 应对第三方库使用自定义加载器又不注册的情况（这里对 SpringBoot 提出批评）
+                    // 最大限度降低 ClassLoader 到下级加载器
+                    Class<?> caller = Reflection.getCallerClass();
+                    String name = desc.getName();
+                    clazz = Class.forName(name, true, caller.getClassLoader());
+                }
                 return clazz == java.lang.invoke.SerializedLambda.class ? SerializedLambda.class : clazz;
             }
         }) {
@@ -117,7 +127,7 @@ public class SerializedLambda implements Serializable {
     /**
      * @return 获取实例化方法的类型
      */
-    public Class getInstantiatedType() {
+    public Class<?> getInstantiatedType() {
         String instantiatedTypeName = normalizedName(instantiatedMethodType.substring(2, instantiatedMethodType.indexOf(';')));
         return ClassUtils.toClassConfident(instantiatedTypeName);
     }