【功能修复】 修复表单内用户字段可以多选时的问题

yudao-module-bpm/yudao-module-bpm-biz/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/core/candidate/strategy/user/BpmTaskCandidateUserFieldOnFormStrategy.java

@@ -2,26 +2,22 @@ package cn.iocoder.yudao.module.bpm.framework.flowable.core.candidate.strategy.u
 
 import cn.hutool.core.convert.Convert;
 import cn.hutool.core.lang.Assert;
-import cn.hutool.core.map.MapUtil;
 import cn.iocoder.yudao.module.bpm.framework.flowable.core.candidate.BpmTaskCandidateStrategy;
 import cn.iocoder.yudao.module.bpm.framework.flowable.core.enums.BpmTaskCandidateStrategyEnum;
 import org.flowable.bpmn.model.BpmnModel;
 import org.flowable.engine.delegate.DelegateExecution;
 import org.springframework.stereotype.Component;
 
-import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
 
-import static cn.iocoder.yudao.framework.common.util.collection.SetUtils.asSet;
-
 /**
  * 表单内用户字段 {@link BpmTaskCandidateUserStrategy} 实现类
  *
  * @author jason
  */
 @Component
-public class BpmTaskCandidateUserFieldOnFormStrategy implements BpmTaskCandidateStrategy  {
+public class BpmTaskCandidateUserFieldOnFormStrategy implements BpmTaskCandidateStrategy {
 
     @Override
     public BpmTaskCandidateStrategyEnum getStrategy() {
@@ -35,7 +31,7 @@ public class BpmTaskCandidateUserFieldOnFormStrategy implements BpmTaskCandidate
 
     @Override
     public Set<Long> calculateUsersByTask(DelegateExecution execution, String param) {
-        Object result =  execution.getVariable(param);
+        Object result = execution.getVariable(param);
         return Convert.toSet(Long.class, result);
     }
 
@@ -43,8 +39,8 @@ public class BpmTaskCandidateUserFieldOnFormStrategy implements BpmTaskCandidate
     public Set<Long> calculateUsersByActivity(BpmnModel bpmnModel, String activityId,
                                               String param, Long startUserId, String processDefinitionId,
                                               Map<String, Object> processVariables) {
-        Long result = MapUtil.getLong(processVariables, param);
-        return result != null ? asSet(result) : new HashSet<>();
+        Object result = processVariables == null ? null : processVariables.get(param);
+        return Convert.toSet(Long.class, result);
     }
 
 }