I'm using an Express server, and everything seem to be working fine. I run my Angular application on it and it runs as it should Navigating between the different routes works like a charm.
But if I navigate to a route, and reload the page in browser, the server returns "Internal Server Error" and the following appears in my server log:
Error
at XMLHttpRequest3.send (/Users/<path-to>/server/main.js:1:4025798)
at Observable._subscribe (/Users/<path-to>/server/main.js:1:4264955)
at Observable._trySubscribe (/Users/<path-to>/server/main.js:1:3520438)
at Observable.subscribe (/Users/<path-to>/server/main.js:1:3520220)
at DoOperator.call (/Users/<path-to>/server/main.js:1:3583421)
at Observable.subscribe (/Users/<path-to>/server/main.js:1:3520074)
at CatchOperator.call (/Users/<path-to>/server/main.js:1:3562760)
at Observable.subscribe (/Users/<path-to>/server/main.js:1:3520074)
at scheduleTask (/Users/<path-to>/main.js:1:640743)
at Observable._subscribe (/Users/<path-to>/server/main.js:1:641346)
Unhandled Promise rejection: req.next is not a function ; Zone: <root> ; Task: Promise.then ; Value: TypeError: req.next is not a function
at done (/Users/<path-to>/server/main.js:1:2200666)
at _ZoneDelegate2.invoke (/Users/<path-to>/server/main.js:1:4048589)
at Zone3.run (/Users/<path-to>/server/main.js:1:4040924)
at /Users/<path-to>/server/main.js:1:4068136
at _ZoneDelegate2.invokeTask (/Users/<path-to>/server/main.js:1:4049527)
at Zone3.runTask (/Users/<path-to>/main.js:1:4042009)
at drainMicroTaskQueue (/Users/<path-to>/server/main.js:1:4053298) TypeError: req.next is not a function
at done (/Users/<path-to>/server/main.js:1:2200666)
at _ZoneDelegate2.invoke (/Users/<path-to>/server/main.js:1:4048589)
at Zone3.run (/Users/<path-to>/server/main.js:1:4040924)
at /Users/<path-to>/server/main.js:1:4068136
at _ZoneDelegate2.invokeTask (/Users/<path-to>/server/main.js:1:4049527)
at Zone3.runTask (/Users/<path-to>/server/main.js:1:4042009)
at drainMicroTaskQueue (/Users/<path-to>/server/main.js:1:4053298)
Edit: The server crashes with the error below when i do a second reload.
/Users/<path-to>/server/main.js:1
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integrations_namespaceObject={};__webpack_require__2.r(integrations_namespaceObject),__webpack_require__2.d(integrations_namespaceObject,{Console:()=>Console,ContextLines:()=>ContextLines,Http:()=>Http,LinkedErrors:()=>LinkedErrors,Modules:()=>Modules,OnUncaughtException:()=>OnUncaughtException,OnUnhandledRejection:()=>OnUnhandledRejection});var esm_integrations_namespaceObject={};__webpack_require__2.r(esm_integrations_namespaceObject),__webpack_require__2.d(esm_integrations_namespaceObject,{FunctionToString:()=>FunctionToString,InboundFilters:()=>InboundFilters});var handlers_namespaceObject={};__webpack_require__2.r(handlers_namespaceObject),__webpack_require__2.d(handlers_namespaceObject,{errorHandler:()=>errorHandler,extractRequestData:()=>extractRequestData,parseRequest:()=>parseRequest,requestHandler:()=>requestHandler,tracingHandler:()=>tracingHandler});var node_esm_namespaceObject={};__webpack_require__2.r(node_esm_namespaceObject),__webpack_require__2.d(node_esm_namespaceObject,{Handlers:()=>handlers_namespaceObject,Hub:()=>Hub,Integrations:()=>INTEGRATIONS,NodeBackend:()=>NodeBackend,NodeClient:()=>NodeClient,SDK_NAME:()=>SDK_NAME,SDK_VERSION:()=>SDK_VERSION,Scope:()=>scope_Scope,Session:()=>Session,Severity:()=>Severity,Transports:()=>transports_namespaceObject,addBreadcrumb:()=>addBreadcrumb,addGlobalEventProcessor:()=>addGlobalEventProcessor,captureEvent:()=>captureEvent,captureException:()=>captureException,captureMessage:()=>captureMessage,close:()=>sdk_close,configureScope:()=>configureScope,deepReadDirSync:()=>deepReadDirSync,defaultIntegrations:()=>defaultIntegrations,flush:()=>flush,getCurrentHub:()=>getCurrentHub,getHubFromCarrier:()=>getHubFromCarrier,getSentryRelease:()=>getSentryRelease,init:()=>init,lastEventId:()=>lastEventId,makeMain:()=>makeMain,setContext:()=>setContext,setExtra:()=>setExtra,setExtras:()=>setExtras,setTag:()=>setTag,setTags:()=>setTags,setUser:()=>setUser,startTransaction:()=>startTransaction,withScope:()=>withScope});var integrations_namespaceObject_0={};__webpack_require__2.r(integrations_namespaceObject_0),__webpack_require__2.d(integrations_namespaceObject_0,{FunctionToString:()=>functiontostring_FunctionToString,InboundFilters:()=>inboundfilters_InboundFilters});var browser_esm_integrations_namespaceObject={};__webpack_require__2.r(browser_esm_integrations_namespaceObject),__webpack_require__2.d(browser_esm_integrations_namespaceObject,{Breadcrumbs:()=>Breadcrumbs,Dedupe:()=>Dedupe,GlobalHandlers:()=>GlobalHandlers,LinkedErrors:()=>linkederrors_LinkedErrors,TryCatch:()=>TryCatch,UserAgent:()=>UserAgent});var esm_transports_namespaceObject={};__webpack_require__2.r(esm_transports_namespaceObject),__webpack_require__2.d(esm_transports_namespaceObject,{BaseTransport:()=>base_BaseTransport,FetchTransport:()=>FetchTransport,XHRTransport:()=>XHRTransport,makeNewFetchTransport:()=>makeNewFetchTransport,makeNewXHRTransport:()=>makeNewXHRTransport});var browser_esm_namespaceObject={};__webpack_require__2.r(browser_esm_namespaceObject),__webpack_require__2.d(browser_esm_namespaceObject,{BrowserClient:()=>BrowserClient,Hub:()=>hub_Hub,Integrations:()=>esm_INTEGRATIONS,SDK_NAME:()=>version_SDK_NAME,SDK_VERSION:()=>version_SDK_VERSION,Scope:()=>scope_Scope_0,Session:()=>session_Session,Severity:()=>severity_Severity,Transports:()=>esm_transports_namespaceObject,addBreadcrumb:()=>minimal_addBreadcrumb,addGlobalEventProcessor:()=>scope_addGlobalEventProcessor,captureEvent:()=>minimal_captureEvent,captureException:()=>minimal_captureException,captureMessage:()=>minimal_captureMessage,close:()=>esm_sdk_close,configureScope:()=>minimal_configureScope,defaultIntegrations:()=>sdk_defaultIntegrations,eventFromException:()=>eventFromException,eventFromMessage:()=>eventbuilder_eventFromMessage,flush:()=>sdk_flush,forceLoad:()=>forceLoad,getCurrentHub:()=>hub_getCurrentHub,getHubFromCarrier:()=>hub_getHubFromCarrier,init:()=>sdk_init,injectReportDialog:()=>injectReportDialog,lastEventId:()=>sdk_lastEventId,makeMain:()=>hub_makeMain,onLoad:()=>onLoad,setContext:()=>minimal_setContext,setExtra:()=>minimal_setExtra,setExtras:()=>minimal_setExtras,setTag:()=>minimal_setTag,setTags:()=>minimal_setTags,setUser:()=>minimal_setUser,showReportDialog:()=>showReportDialog,startTransaction:()=>minimal_startTransaction,withScope:()=>minimal_withScope,wrap:()=>sdk_wrap});__webpack_require__2(97584);var 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A server error has occurred.
node exited with 1 code.
I suspect this is a symptom of client side routing, which is typical of Single Page Applications (SPAs). As you navigate through your working application, you see your address bar entries change. But those are not URLs being requested from your Express server. Rather, your Angular framework is intercepting the request and invoking the JavaScript you packaged with your application.
The only "legitimate" URL for your application would be the one that initially loads your application. Everything you see in the address bar afterwards is recognized by your Angular router, but not by your Express server.
When exceptions occur in a UIPath project I have an email that is sent out with the exception info included. There seems to be an issue though where I can only see where the error occured by looking at the selector information such as:
Cannot find the UI element corresponding to this selector:
<html app='chrome.exe' title='Microsoft Dynamics GP' />
<webctrl aaname='Add' idx='1'
parentid='a00000000000000008549000000030009000000000001000000000000' tag='DIV' />
This info and the stack trace or any other info is not really helpful for quickly finding the source of the problem. I have looked through the UIPath documentation and forum and found only the this question, which seemed to point to using the exception.Source to show the name of the activity where the error occurred. exception.Source only returns “UiPath.Core.Activities” though instead of "Type into Copy Job# 'INPUT'" in the following example:
This obviously causes a big problem with exception handling. How can I easily return the source with each exception?
When your selector fails, you will end up with a new object of type UiPath.Core.SelectorNotFoundException. However, until the team at UiPath decides to add the Display Name into the inner exception, there is little you can do in this particular case.
Take the following example - the first line shows the Inner Exception, and the second one in red is essentially just the exception being rethrown. Note that only the latter one contains the Display Name property.
The Source itself will usually be of type UiPath.Core.Activities, but since this is just the type's name, we don't have any link to the faulting object. Here's what you can do:
Add some details to your exception. You don't want to do this for each activity, but you could have certain blocks of try-catches (example: logging into the system consists of three individual activites, and they reside in one block).
Rethrow the exception. That way the Display Name will end up in the execution log file.