diff --git a/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/config/BpmFlowableConfiguration.java b/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/config/BpmFlowableConfiguration.java
index e79437b436..3cedf71bb2 100644
--- a/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/config/BpmFlowableConfiguration.java
+++ b/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/config/BpmFlowableConfiguration.java
@@ -11,12 +11,9 @@ import org.flowable.common.engine.api.delegate.event.FlowableEventListener;
 import org.flowable.spring.SpringProcessEngineConfiguration;
 import org.flowable.spring.boot.EngineConfigurationConfigurer;
 import org.springframework.beans.factory.ObjectProvider;
-import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.context.ApplicationEventPublisher;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.core.task.AsyncListenableTaskExecutor;
-import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
 
 import java.util.List;
 
@@ -28,26 +25,6 @@ import java.util.List;
 @Configuration(proxyBeanMethods = false)
 public class BpmFlowableConfiguration {
 
-    /**
-     * 参考 {@link org.flowable.spring.boot.FlowableJobConfiguration} 类，创建对应的 AsyncListenableTaskExecutor Bean
-     *
-     * 如果不创建，会导致项目启动时，Flowable 报错的问题
-     */
-    @Bean(name = "applicationTaskExecutor")
-    @ConditionalOnMissingBean(name = "applicationTaskExecutor")
-    public AsyncListenableTaskExecutor taskExecutor() {
-        ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
-        executor.setCorePoolSize(8);
-        executor.setMaxPoolSize(8);
-        executor.setQueueCapacity(100);
-        executor.setThreadNamePrefix("flowable-task-Executor-");
-        executor.setAwaitTerminationSeconds(30);
-        executor.setWaitForTasksToCompleteOnShutdown(true);
-        executor.setAllowCoreThreadTimeOut(true);
-        executor.initialize();
-        return executor;
-    }
-
     /**
      * BPM 模块的 ProcessEngineConfigurationConfigurer 实现类：
      *
diff --git a/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/behavior/BpmSequentialMultiInstanceBehavior.java b/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/behavior/BpmSequentialMultiInstanceBehavior.java
index 75582a0541..8848f81836 100644
--- a/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/behavior/BpmSequentialMultiInstanceBehavior.java
+++ b/yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/behavior/BpmSequentialMultiInstanceBehavior.java
@@ -8,6 +8,7 @@ import cn.iocoder.yudao.module.bpm.framework.flowable.core.util.BpmnModelUtils;
 import cn.iocoder.yudao.module.bpm.framework.flowable.core.util.FlowableUtils;
 import lombok.Setter;
 import org.flowable.bpmn.model.*;
+import org.flowable.common.engine.api.delegate.Expression;
 import org.flowable.engine.delegate.DelegateExecution;
 import org.flowable.engine.impl.bpmn.behavior.AbstractBpmnActivityBehavior;
 import org.flowable.engine.impl.bpmn.behavior.SequentialMultiInstanceBehavior;
@@ -90,4 +91,21 @@ public class BpmSequentialMultiInstanceBehavior extends SequentialMultiInstanceB
         super.executeOriginalBehavior(execution, multiInstanceRootExecution, loopCounter);
     }
 
+    // ========== 屏蔽解析器覆写 ==========
+
+    @Override
+    public void setCollectionExpression(Expression collectionExpression) {
+        // 保持自定义变量名，忽略解析器写入的 collection 表达式
+    }
+
+    @Override
+    public void setCollectionVariable(String collectionVariable) {
+        // 保持自定义变量名，忽略解析器写入的 collection 变量名
+    }
+
+    @Override
+    public void setCollectionElementVariable(String collectionElementVariable) {
+        // 保持自定义变量名，忽略解析器写入的单元素变量名
+    }
+
 }
diff --git a/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/auth/vo/AuthLoginReqVO.java b/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/auth/vo/AuthLoginReqVO.java
index 483e5112c9..f4875563da 100644
--- a/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/auth/vo/AuthLoginReqVO.java
+++ b/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/auth/vo/AuthLoginReqVO.java
@@ -23,8 +23,8 @@ public class AuthLoginReqVO extends CaptchaVerificationReqVO {
 
     @Schema(description = "账号", requiredMode = Schema.RequiredMode.REQUIRED, example = "yudaoyuanma")
     @NotEmpty(message = "登录账号不能为空")
-    @Length(min = 4, max = 16, message = "账号长度为 4-16 位")
-    @Pattern(regexp = "^[A-Za-z0-9]+$", message = "账号格式为数字以及字母")
+    @Length(min = 4, max = 30, message = "账号长度为 4-30 位")
+    @Pattern(regexp = "^[a-zA-Z0-9]{4,30}$", message = "账号格式为数字以及字母")
     private String username;
 
     @Schema(description = "密码", requiredMode = Schema.RequiredMode.REQUIRED, example = "buzhidao")
diff --git a/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/user/vo/user/UserSaveReqVO.java b/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/user/vo/user/UserSaveReqVO.java
index 827f5e9503..192e0539f1 100644
--- a/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/user/vo/user/UserSaveReqVO.java
+++ b/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/user/vo/user/UserSaveReqVO.java
@@ -23,7 +23,7 @@ public class UserSaveReqVO {
 
     @Schema(description = "用户账号", requiredMode = Schema.RequiredMode.REQUIRED, example = "yudao")
     @NotBlank(message = "用户账号不能为空")
-    @Pattern(regexp = "^[a-zA-Z0-9]+$", message = "用户账号由 数字、字母 组成")
+    @Pattern(regexp = "^[a-zA-Z0-9]{4,30}$", message = "用户账号由 数字、字母 组成")
     @Size(min = 4, max = 30, message = "用户账号长度为 4-30 个字符")
     @DiffLogField(name = "用户账号")
     private String username;
diff --git a/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/service/oauth2/OAuth2TokenServiceImpl.java b/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/service/oauth2/OAuth2TokenServiceImpl.java
index 2a01a006e9..dc70874cf0 100644
--- a/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/service/oauth2/OAuth2TokenServiceImpl.java
+++ b/yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/service/oauth2/OAuth2TokenServiceImpl.java
@@ -6,6 +6,7 @@ import cn.hutool.core.util.IdUtil;
 import cn.hutool.core.util.ObjectUtil;
 import cn.hutool.core.util.StrUtil;
 import cn.iocoder.yudao.framework.common.enums.UserTypeEnum;
+import cn.iocoder.yudao.framework.common.exception.ServiceException;
 import cn.iocoder.yudao.framework.common.exception.enums.GlobalErrorCodeConstants;
 import cn.iocoder.yudao.framework.common.pojo.PageResult;
 import cn.iocoder.yudao.framework.common.util.date.DateUtils;
@@ -68,7 +69,7 @@ public class OAuth2TokenServiceImpl implements OAuth2TokenService {
     }
 
     @Override
-    @Transactional(rollbackFor = Exception.class)
+    @Transactional(noRollbackFor = ServiceException.class)
     public OAuth2AccessTokenDO refreshAccessToken(String refreshToken, String clientId) {
         // 查询访问令牌
         OAuth2RefreshTokenDO refreshTokenDO = oauth2RefreshTokenMapper.selectByRefreshToken(refreshToken);