feat(BPM): AsyncTaskExecutor 如果不创建，会导致项目启动时，Flowable 报错的问题

yudao-module-bpm/src/main/java/cn/iocoder/yudao/module/bpm/framework/flowable/config/BpmFlowableConfiguration.java

@@ -11,9 +11,12 @@ 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.AsyncTaskExecutor;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor;
 
 import java.util.List;
 
@@ -25,6 +28,26 @@ 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
+     * <p>
+     * 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 AsyncTaskExecutor 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：
      *