1 节点无法往下走：No outgoing sequence flow of the exclusive gateway

1.1 报错内容如下：

org.activiti.engine.ActivitiException: No outgoing sequence flow of the exclusive gateway 'Gateway_0eog5rg' could be selected for continuing the processat org.activiti.engine.impl.bpmn.behavior.ExclusiveGatewayActivityBehavior.leave(ExclusiveGatewayActivityBehavior.java:105)at org.activiti.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.execute(FlowNodeActivityBehavior.java:38)at org.activiti.engine.impl.agenda.ContinueProcessOperation.executeActivityBehavior(ContinueProcessOperation.java:211)at org.activiti.engine.impl.agenda.ContinueProcessOperation.executeSynchronous(ContinueProcessOperation.java:145)at org.activiti.engine.impl.agenda.ContinueProcessOperation.continueThroughFlowNode(ContinueProcessOperation.java:102)at org.activiti.engine.impl.agenda.ContinueProcessOperation.run(ContinueProcessOperation.java:67)at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:73)at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:57)at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:42)at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48)at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:59)at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:193)at com.xh.niec.service.impl.ActCommonServiceImpl.completeTaskWithVariable(ActCommonServiceImpl.java:112)at com.xh.niec.service.impl.FaultOrderServiceImpl.faultOrderFlow(FaultOrderServiceImpl.java:185)at com.xh.niec.service.impl.FaultOrderServiceImpl$$FastClassBySpringCGLIB$$688da1f8.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:685)at com.xh.niec.service.impl.FaultOrderServiceImpl$$EnhancerBySpringCGLIB$$4710d37e.faultOrderFlow(<generated>)at com.xh.niec.controller.FaultOrderController.faultOrderFlow(FaultOrderController.java:105)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:566)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doPut(FrameworkServlet.java:920)at javax.servlet.http.HttpServlet.service(HttpServlet.java:663)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.gh.common.filter.TokenAuthenticationFilter.doFilterInternal(TokenAuthenticationFilter.java:53)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter(OAuth2AuthenticationProcessingFilter.java:176)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108)

1.2 分析原因

• 完成节点的时候，不满足往下走的条件。本质上是因为工作流认为当前节点往下走的条件没有任何一条分支可以满足；
• 最终的解决方案，肯定会把你引向条件表达式有问题上；

1.3 No outgoing sequence flow 常见问题以及解决方案

• 多数情况，优先检查当前节点的变量是否满足流程图中的任一条件分支
  （举个例子：条件分支中有两个条件分别是 ${status==1} 和 ${status==2}，此时传进去的变量值为 status==3，不满足两个条件中的任意一个，工作流判断没有哪条分支可以执行，则报错。）
• 查看流程图中的排他网关的条件变量名和代码中的变量名是否一致，这点很容易疏忽，记错容易写岔劈
  （比如：流程图中配置的判断条件是：${roleName==‘系统管理员’}，而代码中的变量名为 userName，工作流判断没有满足的分支可以走，则报错。）
• 若流程图条件变量和代码中变量一致，需要考虑条件的完整性
  （比如：流程图中配置的判断条件是${price>=100} 和 ${price>=200} 和 ${price==50}，这属于典型的不完整，这个条件下的区间外集还是很明显的，尽量保证条件的完整性。）
• 变量没有塞进去，这个错误不容易犯，但是犯了这个错很难找出来
  （我们习惯性的设置变量用的都是用 taskService.setVariable() 方法，以及使用 taskService.complete(taskId,variableMap) 方法来完成当前节点，这些变量是贯穿流程的，并不会绑定当前节点。建议使用 taskService.complete(taskId,variableMap,true) 或taskService.setVariableLocal 方法）
  （PS：这个问题曾困扰我一天半，最终才发现是这个问题）

2 taskId相关的报错：不存在，或者为空，或者无效

    taskId不存在，或者为空，或者无效的问题，影响有很多，无法一一列举，但是可以从下面两个角度着手去思考：

• 当前节点已经执行完成。当前的 taskId 并不是你理解的 taskId。（每流转到一个节点，taskId 都是会改变的，只有主流程的 PROC_INST_ID 才是不变的）
• taskId 一开始就没有值，或在某个代码块中被赋予成了其他的值。（我就是这样，把 taskId 保存在了业务表，然后再完成节点的时候再塞进去，最后发现是变量名取错了，一直报 taskId is null，一定要仔细检查。）

3 Unknown property used in expression 表达式中有未知的属性被使用了

3.1 报错内容如下：

org.activiti.engine.ActivitiException: Unknown property used in expression: ${faultStatus == 1 && maintenanceProfession==1}at org.activiti.engine.impl.el.JuelExpression.getValueFromContext(JuelExpression.java:93)at org.activiti.engine.impl.el.JuelExpression.getValue(JuelExpression.java:50)at org.activiti.engine.impl.el.UelExpressionCondition.evaluate(UelExpressionCondition.java:36)at org.activiti.engine.impl.util.condition.ConditionUtil.hasTrueCondition(ConditionUtil.java:34)at org.activiti.engine.impl.bpmn.behavior.ExclusiveGatewayActivityBehavior.leave(ExclusiveGatewayActivityBehavior.java:75)at org.activiti.engine.impl.bpmn.behavior.FlowNodeActivityBehavior.execute(FlowNodeActivityBehavior.java:38)at org.activiti.engine.impl.agenda.ContinueProcessOperation.executeActivityBehavior(ContinueProcessOperation.java:211)at org.activiti.engine.impl.agenda.ContinueProcessOperation.executeSynchronous(ContinueProcessOperation.java:145)at org.activiti.engine.impl.agenda.ContinueProcessOperation.continueThroughFlowNode(ContinueProcessOperation.java:102)at org.activiti.engine.impl.agenda.ContinueProcessOperation.run(ContinueProcessOperation.java:67)at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperation(CommandInvoker.java:73)at org.activiti.engine.impl.interceptor.CommandInvoker.executeOperations(CommandInvoker.java:57)at org.activiti.engine.impl.interceptor.CommandInvoker.execute(CommandInvoker.java:42)at org.activiti.engine.impl.interceptor.TransactionContextInterceptor.execute(TransactionContextInterceptor.java:48)at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:59)at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:202)at com.xh.niec.service.impl.ActCommonServiceImpl.completeTaskWithVariableLocal(ActCommonServiceImpl.java:100)at com.xh.niec.service.impl.FaultOrderServiceImpl.insertFaultOrder(FaultOrderServiceImpl.java:113)at com.xh.niec.service.impl.FaultOrderServiceImpl$$FastClassBySpringCGLIB$$688da1f8.invoke(<generated>)at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:685)at com.xh.niec.service.impl.FaultOrderServiceImpl$$EnhancerBySpringCGLIB$$fb4fd05c.insertFaultOrder(<generated>)at com.xh.niec.controller.FaultOrderController.add(FaultOrderController.java:85)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)at java.base/java.lang.reflect.Method.invoke(Method.java:566)at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:190)at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:138)at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:888)at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:793)at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1040)at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:943)at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:909)at javax.servlet.http.HttpServlet.service(HttpServlet.java:660)at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)at javax.servlet.http.HttpServlet.service(HttpServlet.java:741)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at com.gh.common.filter.TokenAuthenticationFilter.doFilterInternal(TokenAuthenticationFilter.java:53)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:320)at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:126)at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:90)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:118)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:137)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:111)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:158)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.oauth2.provider.authentication.OAuth2AuthenticationProcessingFilter.doFilter(OAuth2AuthenticationProcessingFilter.java:176)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:92)at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:77)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:334)at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:215)at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:178)at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)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:193)at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96)at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:526)at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:139)at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:367)at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:860)at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1591)at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: javax.el.PropertyNotFoundException: Cannot resolve identifier 'faultStatus'at de.odysseus.el.tree.impl.ast.AstIdentifier.eval(AstIdentifier.java:93)at de.odysseus.el.tree.impl.ast.AstBinary$SimpleOperator.eval(AstBinary.java:31)at de.odysseus.el.tree.impl.ast.AstBinary.eval(AstBinary.java:110)at de.odysseus.el.tree.impl.ast.AstBinary$2.eval(AstBinary.java:42)at de.odysseus.el.tree.impl.ast.AstBinary.eval(AstBinary.java:110)at de.odysseus.el.tree.impl.ast.AstEval.eval(AstEval.java:51)at de.odysseus.el.tree.impl.ast.AstNode.getValue(AstNode.java:31)at de.odysseus.el.TreeValueExpression.getValue(TreeValueExpression.java:122)at org.activiti.engine.impl.delegate.invocation.ExpressionGetInvocation.invoke(ExpressionGetInvocation.java:33)at org.activiti.engine.impl.delegate.invocation.DelegateInvocation.proceed(DelegateInvocation.java:35)at org.activiti.engine.impl.delegate.invocation.DefaultDelegateInterceptor.handleInvocation(DefaultDelegateInterceptor.java:25)at org.activiti.engine.impl.el.JuelExpression.getValueFromContext(JuelExpression.java:90)

3.2 分析原因

       很明显，翻译过来的意思是：表达式中有未知的属性被使用了。说明设置的变量和表达式中的变量没有保持一致，检查两边的变量命名就行了。

3.3 Unknown property used in expression 常见问题以及解决方案

• 仔细对比下变量名和流程图中的 UEL 表达式中的变量，哪个变量报错就是哪个写错了；
• 表达式写错了，多了空格，没有加单引号之类的，不符合UEL 表达式规范；

4 UEL 表达式的内容莫名其妙被转义了

    这种情况，大概率只有一种，那就是被拦截器中的 XSS 自定义方法给转义了，检查那个方法，放行即可

5 activiti不自动建表

    自动建表需要配置 databaseSchemaUpdate 属性值为 true。这种方法建议首次使用开启，后续关闭，特别是生产环境不要开启，否则你会收获很多报错。

• property 的形式

<!--数据库连接池方式配置--><bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"><property name="driverClassName" value="com.mysql.jdbc.Driver"/><property name="url" value="jdbc:mysql://192.168.1.181/activiti?useSSL=false"/><property name="username" value="root"/><property name="password" value="test@xhkj"/><property name="maxActive" value="3"/><property name="maxIdle" value="1"/></bean><!--同样, 在默认方式下bean的id固定为 processEngineConfiguration--><bean id="processEngineConfiguration"class="org.activiti.engine.impl.cfg.StandaloneProcessEngineConfiguration"><!--引入上面配置好的 链接池--><property name="dataSource" ref="dataSource"/><property name="databaseSchemaUpdate" value="true"/></bean>

• yml 形式

spring:activiti:# 是否对数据库架构进行检查更新database-schema-update: none# 历史储存级别history-level: full# 是否开启数据库储存历史记录 如果不开启这个配置的话 Activiti 只会创建17张表，完整的Activiti引擎依赖25张表db-history-used: truedeployment-mode: never-fail