Easily catch error from maven install task in build pipeline in Azure Devops?

So I can help with how you might grab the error out of the build logs and send it over to slack.

Assuming we are going to run this task as the next task after the build error.

• We can get the build logs via the API. Make sure to add the system_access token so you can auth.
• Once we have all the logs grab the url out of the response to download the last log
• Download the last log
• Parse it and find the [[error]] lines
• Marshal the message to slack \ or do whatever else you want with it

YAML

- pwsh: |
    $base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes(("{0}:{1}" -f $user, $env:System_AccessToken)))
    $uriLogs = "$($env:SYSTEM_TEAMFOUNDATIONCOLLECTIONURI)$env:SYSTEM_TEAMPROJECTID/_apis/build/builds/$env:BUILD_BUILDID/logs?api-version=5.1"
    $response = Invoke-RestMethod -Uri $uriLogs -Method 'GET' -Headers @{Authorization = ("Basic {0}" -f $base64AuthInfo)}
    $logUrl =$response.value[-1].url
    $webContent = Invoke-WebRequest -Uri $logUrl -Method 'GET' -Headers @{Authorization = ("Basic {0}" -f $base64AuthInfo)}
    $ErrorMessage = $webContent.Content.tostring() -split "[`r`n]" | select-string "[[Error]]"
    Write-Output "Error lines found " $ErrorMessage

    $postSlackMessage = @{token=$env:SLACK_TOKEN;channel="@user,#channel-name";text=$ErrorMessage}
    Invoke-RestMethod -Uri https://slack.com/api/chat.postMessage -Body $postSlackMessage
  env:
    system_accesstoken: $(System.AccessToken)
  condition: failed()

Other alternatives:

• parse the log, find the error, and then send a link to the failure directly at that line number. There is a well known format for direct links to each line.
• send a direct link to download just the error part of the log. See startLine and endLine parameters here.