TypeError: Cannot read property 'greetingEndpoint' of undefined

[gastaldi]

Having the following configuration breaks the application:

{
	"application": "charming-machine",
	"parts": [{
		"shared": {
			"runtime": {
				"name": "dotnet",
				"version": "community"
			},
			"dotnet": {
				"namespace": "MyApp",
				"version": "1.0.0"
			}
		},
		"extra": {
			"runtimeInfo": {
				"image": "registry.access.redhat.com/dotnet/dotnet-22-rhel7",
				"enumInfo": {
					"id": "dotnet",
					"name": ".NET Core",
					"icon": "data:image/svg+xml;charset=utf8,%3Csvg version='1.1' id='Layer_1' xmlns='http://www.w3.org/2000/svg' xmlns:xlink='http://www.w3.org/1999/xlink' x='0px' y='0px' viewBox='0 0 32 32' style='enable-background:new 0 0 32 32;' xml:space='preserve'%3E%3Cstyle type='text/css'%3E .st0%7Bfill:%23008CDB;%7D%0A%3C/style%3E%3Cpath class='st0' d='M32,9.56h-8.72v1.28h3.59V22h1.53V10.84H32V9.56z M21.81,10.84V9.56h-6.66V22h6.66v-1.28h-5.12v-4.34h4.56 v-1.31h-4.56v-4.22H21.81z M2.16,21.41c0,0.29-0.1,0.54-0.31,0.75s-0.47,0.31-0.78,0.31c-0.29,0-0.54-0.1-0.75-0.31 C0.1,21.95,0,21.7,0,21.41c0-0.31,0.1-0.57,0.31-0.78s0.46-0.31,0.75-0.31c0.31,0,0.57,0.1,0.78,0.31S2.16,21.09,2.16,21.41 L2.16,21.41z M13.41,9.56h-1.53v9.81l-7-9.81H3.34V22h1.53v-9.81L11.91,22h1.5V9.56z'/%3E%3C/svg%3E%0A",
					"description": "Create stand-alone, production-grade .NET Core Applications that you can \"just run\".",
					"metadata": {
						"categories": ["backend"],
						"language": "csharp",
						"website": "https://dotnet.microsoft.com/apps/aspnet"
					}
				},
				"service": "charming-machine",
				"route": "charming-machine"
			},
			"category": "backend"
		},
		"capabilities": [{
			"module": "health",
			"props": {},
			"extra": {
				"category": "backend"
			}
		}, {
			"module": "rest",
			"props": {},
			"extra": {
				"category": "backend"
			}
		}, {
			"module": "database",
			"props": {
				"databaseType": "mysql"
			},
			"extra": {
				"category": "backend",
				"databaseInfo": {
					"image": "mysql",
					"service": "charming-machine-database-bind"
				}
			}
		}, {
			"module": "welcome",
			"props": {},
			"extra": {
				"category": "support"
			}
		}]
	}]
}

This is the error seen in the console

TypeError: Cannot read property 'greetingEndpoint' of undefined
    at e.render (RestCapability.tsx:63)
    at sr (react-dom.production.min.js:163)
    at ir (react-dom.production.min.js:162)
    at mr (react-dom.production.min.js:169)
    at Jr (react-dom.production.min.js:204)
    at Ur (react-dom.production.min.js:205)
    at Oi (react-dom.production.min.js:220)
    at Ai (react-dom.production.min.js:219)
    at zi (react-dom.production.min.js:216)
    at Qr (react-dom.production.min.js:214)
gr @ react-dom.production.min.js:179
react-dom.production.min.js:179 TypeError: Cannot read property 'dbEndpoint' of undefined
    at e.render (DatabaseCapability.tsx:68)
    at sr (react-dom.production.min.js:163)
    at ir (react-dom.production.min.js:162)
    at mr (react-dom.production.min.js:169)
    at Jr (react-dom.production.min.js:204)
    at Ur (react-dom.production.min.js:205)
    at Oi (react-dom.production.min.js:220)
    at Ai (react-dom.production.min.js:219)
    at zi (react-dom.production.min.js:216)
    at Qr (react-dom.production.min.js:214)
gr @ react-dom.production.min.js:179

[quintesse]

The problem should already be fixed in the LCB, but I think it's desirable that the Welcome App is robust enough to not fail completely when non-essential information like that is missing. (In this case it was the developer of the particular generator that didn't understand what those properties were for and had just removed them). In general we can say that the information in the extra property is potentially untrustworthy.