aws.greengrass.clientdevices.mqtt.EMQX fails on Windows

Question

Basic deployment for the new EMQX MQTT Broker (https://docs.aws.amazon.com/greengrass/v2/developerguide/mqtt-broker-emqx-component.html) fails on Windows

The EMQX log is failing w/ a Windows Credentials error:

```
2022-08-19T20:29:26.491Z [INFO] (pool-2-thread-63) aws.greengrass.clientdevices.mqtt.EMQX: shell-runner-start. {scriptName=services.aws.greengrass.clientdevices.mqtt.EMQX.lifecycle.startup.script, serviceName=aws.greengrass.clientdevices.mqtt.EMQX, currentState=STARTING, command=["C:\greengrass\v2\packages\artifacts-unarchived\aws.greengrass.clientdevices.mq..."]}
2022-08-19T20:29:26.492Z [ERROR] (pool-2-thread-63) aws.greengrass.clientdevices.mqtt.EMQX: shell-runner-error. Error while running process. {scriptName=services.aws.greengrass.clientdevices.mqtt.EMQX.lifecycle.startup.script, serviceName=aws.greengrass.clientdevices.mqtt.EMQX, currentState=STARTING, command=["C:\greengrass\v2\packages\artifacts-unarchived\aws.greengrass.clientdevices.mq..."]}
java.io.IOException: Failed to read credential
	at vendored.com.microsoft.alm.storage.windows.internal.WindowsCredUtils.read(WindowsCredUtils.java:36)
	at com.aws.greengrass.util.platforms.windows.WindowsExec.getPassword(WindowsExec.java:298)
	at com.aws.greengrass.util.platforms.windows.WindowsExec.createProcess(WindowsExec.java:116)
	at com.aws.greengrass.util.Exec.exec(Exec.java:316)
	at com.aws.greengrass.util.Exec.background(Exec.java:373)
	at com.aws.greengrass.lifecyclemanager.ShellRunner$Default.successful(ShellRunner.java:110)
	at com.aws.greengrass.lifecyclemanager.GenericExternalService.run(GenericExternalService.java:683)
	at com.aws.greengrass.lifecyclemanager.GenericExternalService.run(GenericExternalService.java:701)
	at com.aws.greengrass.lifecyclemanager.GenericExternalService.run(GenericExternalService.java:629)
	at com.aws.greengrass.lifecyclemanager.GenericExternalService.startup(GenericExternalService.java:343)
	at com.aws.greengrass.lifecyclemanager.Lifecycle.lambda$handleStateTransitionStartingToRunningAsync$9(Lifecycle.java:530)
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: com.sun.jna.LastErrorException: [1168] Element not found.
	at com.sun.jna.Native.invokeInt(Native Method)
	at com.sun.jna.Function.invoke(Function.java:426)
	at com.sun.jna.Function.invoke(Function.java:361)
	at com.sun.jna.Library$Handler.invoke(Library.java:265)
	at com.sun.proxy.$Proxy30.CredRead(Unknown Source)
	at vendored.com.microsoft.alm.storage.windows.internal.WindowsCredUtils.read(WindowsCredUtils.java:31)
	... 15 more
```

MichaelDombrowski-AWS · Accepted Answer

The error "failed to read credential" means that Greengrass was not able to find the password for the component's runWith user. This does not only apply to EMQX, but to any component which runs an external process. This happens when Greengrass is not running as the user which our instructions would have you run it, or if you did not create and store a user's password following: https://docs.aws.amazon.com/greengrass/v2/developerguide/quick-installation.html

If Greengrass is running as a Windows system service, which is what our instructions will have you do, then the user's password must be stored in the LOCAL_SYSTEM account's credential store. Our instructions have you store the password using the `PsExec` utility, so see that portion of the instructions to make sure that you've followed that.

If you aren't running Greengrass as a system service, then you should stop Greengrass and instead run it as a system service.

aws.greengrass.clientdevices.mqtt.EMQX fails on Windows

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