ETL版本V3.9.4，使用docker部署，在使用了库表输入组件，选择了多张数据库表然后下一步载入表结构就直接报错，但是单张可以；请教下这是什么问题？

日志：
ETL01:admin at 01/09 01:46:07 traceId:695fed5f5fa3917a20123d85 =>URL请求执行异常:/rest/etl/sql/listTableColumns traceId=695fed5f5fa3917a20123d85
ETL01:admin at 01/09 01:48:21 traceId:695fede55fa3917a20123f57 =>错误提示:cn.restcloud.sqlmgr.controller.ETLSQLManagerRest.listTableColumns()方法执行出现异常!
ETL01:admin at 01/09 01:48:21 traceId:695fede55fa3917a20123f57 =>java.lang.Class - java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor554.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:278)
at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:222)
at cn.restcloud.framework.core.util.BeanUtil.invokeMethod(BeanUtil.java:37)
at cn.restcloud.framework.core.container.BeanEngine.call(BeanEngine.java:74)
at cn.restcloud.framework.dispatcher.ControllerDispatcher.executeControllerBean(ControllerDispatcher.java:222)
at cn.restcloud.framework.dispatcher.ActionDispatcher.execute(ActionDispatcher.java:209)
at cn.restcloud.springboot.init.RestCloudServlet.doGet(RestCloudServlet.java:60)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:670)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:779)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:227)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at cn.restcloud.springboot.filter.ResourceCacheFilter.doFilterInternal(ResourceCacheFilter.java:33)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at cn.restcloud.springboot.filter.AppRequestFilter.doFilterInternal(AppRequestFilter.java:30)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at cn.restcloud.framework.filters.ServiceFilter.doFilter(ServiceFilter.java:42)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:128)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.access$000(ErrorPageFilter.java:66)
at org.springframework.boot.web.servlet.support.ErrorPageFilter$1.doFilterInternal(ErrorPageFilter.java:103)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.springframework.boot.web.servlet.support.ErrorPageFilter.doFilter(ErrorPageFilter.java:121)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:189)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:162)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:197)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:541)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:135)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:687)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:360)
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:399)
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:893)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1789)
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:750)
Caused by: java.sql.SQLException: connection closed
at com.alibaba.druid.pool.DruidPooledConnection.checkStateInternal(DruidPooledConnection.java:1190)
at com.alibaba.druid.pool.DruidPooledConnection.checkState(DruidPooledConnection.java:1181)
at com.alibaba.druid.pool.DruidPooledConnection.getCatalog(DruidPooledConnection.java:951)
at cn.restcloud.etl.process.engine.service.db.ETLConnSchemaUtil.getConnSchema(ETLConnSchemaUtil.java:68)
at cn.restcloud.etl.process.engine.service.db.ETLRdbMetaDataUtil.listColumnsMetaInfoByTableName(ETLRdbMetaDataUtil.java:730)
at cn.restcloud.sqlmgr.controller.ETLSQLManagerRest.listTableColumns(ETLSQLManagerRest.java:319)