Azure Functions，“System.Private.CoreLib：值不能为空。（参数'path1'）。值不能为空。（参数'provider'）”答案

【问题标题】：Azure Functions, "System.Private.CoreLib: Value cannot be null. (Parameter 'path1'). Value cannot be null. (Parameter 'provider')"Azure Functions，“System.Private.CoreLib：值不能为空。（参数'path1'）。值不能为空。（参数'provider'）”
【发布时间】：2020-06-30 00:41:38
【问题描述】：

我在我的 Gradle（4.6 版）Java (JDK 1.8) 项目中使用 azure 函数应用程序运行 Azure 函数/核心工具 3.x。我在 localhost:7071 的 api/devices 有一个 GET 端点，但我一直在运行 azureFunctionsRun。

当我运行 azureFunctionsPackage 时，它似乎工作正常。当我运行 azureFunctionsRun 时，我收到下面发布的错误。当我使用 azure core tools 2.x 时，我很喜欢使用命令“func start”，一切都完美无缺。我有带有样板版本和 ExtensionBundles 脚本的 host.json 文件和带有 Azure Web Jobs Storage 连接字符串的 local.settings.json：

Azure Functions Core Tools found.
Starting running Azure Functions...
Executing command: cmd.exe /c cd /D C:\git\edge_bootstrap_ms\build\azurefunctions\edge-bootstrap-ms && func host start

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Azure Functions Core Tools (3.0.2106 Commit hash: 5431fca4f603bf9446d7dd2d5f96a43b5f69b5cb)
Function Runtime Version: 3.0.13107
[3/18/2020 8:56:57 PM] FUNCTIONS_WORKER_RUNTIME set to java. Skipping WorkerConfig for language:node
[3/18/2020 8:56:57 PM] FUNCTIONS_WORKER_RUNTIME set to java. Skipping WorkerConfig for language:powershell
[3/18/2020 8:56:57 PM] FUNCTIONS_WORKER_RUNTIME set to java. Skipping WorkerConfig for language:python
[3/18/2020 8:56:57 PM] Starting worker process:C:\Program Files\Java\jdk1.8.0_241\bin\java  -XX:+TieredCompilation -XX:TieredStopAtLevel=1 -noverify -Djava.net.preferIPv4Stack=true -jar "C:\Users\KBRV37\AppData\Roaming\npm\node_modules\azure-functions-core-tools\bin\workers\java\azure-functions-java-worker.jar" --host 127.0.0.1 --port 61509 --workerId 9ff09cf4-42d8-4e1a-b66e-8058754fe61a --requestId 123c617a-61e1-4b3a-98d8-13b6a5eff6c1 --grpcMaxMessageLength 134217728
[3/18/2020 8:56:57 PM] C:\Program Files\Java\jdk1.8.0_241\bin\java process with Id=10984 started
[3/18/2020 8:56:57 PM] [INFO] {Application.main}: Azure Functions Java Worker  version [ 1.5.2-SNAPSHOT]
[3/18/2020 8:56:58 PM] [INFO] {MessageHandler.handle}: Message generated by "StartStream.Builder"
[3/18/2020 8:56:59 PM] Building host: startup suppressed: 'False', configuration suppressed: 'False', startup operation id: '078289ce-7cd5-4f2f-924b-40696702867a'
[3/18/2020 8:56:59 PM] Reading host configuration file 'C:\git\edge_bootstrap_ms\build\azurefunctions\edge-bootstrap-ms\host.json'
[3/18/2020 8:56:59 PM] Host configuration file read:
[3/18/2020 8:56:59 PM] {
[3/18/2020 8:56:59 PM]   "version": "2.0",
[3/18/2020 8:56:59 PM]   "extensionBundle": {
[3/18/2020 8:56:59 PM]     "id": "Microsoft.Azure.Functions.ExtensionBundle",
[3/18/2020 8:56:59 PM]     "version": "[1.*, 2.0.0)"
[3/18/2020 8:56:59 PM]   }
[3/18/2020 8:56:59 PM] }
[3/18/2020 8:56:59 PM] Reading functions metadata
[3/18/2020 8:56:59 PM] 3 functions found
[3/18/2020 8:56:59 PM] Looking for extension bundle Microsoft.Azure.Functions.ExtensionBundle at (null)
[3/18/2020 8:56:59 PM] Fetching information on versions of extension bundle Microsoft.Azure.Functions.ExtensionBundle available on https://functionscdn.azureedge.net/public/ExtensionBundles/Microsoft.Azure.Functions.ExtensionBundle/index.json
[3/18/2020 8:56:59 PM] A host error has occurred during startup operation '078289ce-7cd5-4f2f-924b-40696702867a'.
[3/18/2020 8:56:59 PM] System.Private.CoreLib: Value cannot be null. (Parameter 'path1').
Value cannot be null. (Parameter 'provider')
Application is shutting down...
[3/18/2020 8:56:59 PM] Initialization cancellation requested by runtime.
[3/18/2020 8:56:59 PM] Shutting down language worker channels for runtime:java
[3/18/2020 8:56:59 PM] Stopping host...
[3/18/2020 8:56:59 PM] Host shutdown completed.
:azureFunctionsRun FAILED
1 actionable task: 1 executed

FAILURE: Build failed with an exception.

Host.json：

{
  "version": "2.0",
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[1.*, 3.0.0)"
  }
}

local.settings.json：

{
  "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "DefaultEndpointsProtocol=https;AccountName=myAzureAccountName;AccountKey=myAzureAccountKeyString==",
    "FUNCTIONS_WORKER_RUNTIME": "java"
  }
}

【问题讨论】：

你能展示一下你的azure函数的代码吗？

标签： java http gradle azure-functions endpoint

【解决方案1】：

我可以通过卸载 coretools 3.x 并重新安装来解决此问题。或者就像我在这篇文章中所说的，如果你很懒，你可以点击 azurefunctinosrun 失败时显示在控制台中的那个 extensionsbundle 链接，在你再次运行 azurefunctions 后它会立即工作。

【讨论】：

【解决方案2】：

我在 DI 服务的构造函数中使用的“local.setting.json”中缺少配置值。通过添加这些值解决了我的问题。希望你也是。

【讨论】：