我试图在IBM Watson Unity SDK中运行该示例，但是当它尝试创建会话时却遇到了NullReferenceException。
这是SDK的示例脚本，但修改后的行除外。我添加这些是因为出于某些奇怪的原因，未将用户名和密码添加到凭据中。如果您对此有一个答案，那么我会为此问题here
创建一个单独的问题using System.Collections;
using System.Collections.Generic;
using IBM.Watson.DeveloperCloud.Connection;
using IBM.Watson.DeveloperCloud.Logging;
using IBM.Watson.DeveloperCloud.Utilities;
using IBM.WatsonDeveloperCloud.Assistant.v2;
using UnityEngine;
namespace IBM.Watson.DeveloperCloud.Services.Assistant.v2
{
public class ExampleAssistantV2 : MonoBehaviour
{
#region PLEASE SET THESE VARIABLES IN THE INSPECTOR
[Space(10)]
[Tooltip("The service URL (optional). This defaults to \"https://gateway.watsonplatform.net/assistant/api\"")]
[SerializeField]
private string _serviceUrl;
[Tooltip("The assistantId to run the example.")]
[SerializeField]
private string _assistantId;
[Tooltip("The version date with which you would like to use the service in the form YYYY-MM-DD.")]
[SerializeField]
private string _versionDate;
[Header("CF Authentication")]
[Tooltip("The authentication username.")]
[SerializeField]
private string _username;
[Tooltip("The authentication password.")]
[SerializeField]
private string _password;
[Header("IAM Authentication")]
[Tooltip("The IAM apikey.")]
[SerializeField]
private string _iamApikey;
[Tooltip("The IAM url used to authenticate the apikey (optional). This defaults to \"https://iam.bluemix.net/identity/token\".")]
[SerializeField]
private string _iamUrl;
#endregion
private Assistant _service;
private bool _createSessionTested = false;
private bool _messageTested = false;
private bool _deleteSessionTested = false;
private string _sessionId;
private void Start()
{
LogSystem.InstallDefaultReactors();
Runnable.Run(CreateService());
}
private IEnumerator CreateService()
{
// Create credential and instantiate service
Credentials credentials = null;
if (!string.IsNullOrEmpty(_username) && !string.IsNullOrEmpty(_password))
{
// Authenticate using username and password
credentials = new Credentials(_username, _password, _serviceUrl);
credentials.Username = _username; //Modified
credentials.Password = _password; //Modified
credentials.Url = _serviceUrl; //Modified
}
else if (!string.IsNullOrEmpty(_iamApikey))
{
// Authenticate using iamApikey
TokenOptions tokenOptions = new TokenOptions()
{
IamApiKey = _iamApikey,
IamUrl = _iamUrl
};
credentials = new Credentials(tokenOptions, _serviceUrl);
// Wait for tokendata
while (!credentials.HasIamTokenData())
yield return null;
}
else
{
throw new WatsonException("Please provide either username and password or IAM apikey to authenticate the service.");
}
_service = new Assistant(credentials);
_service.VersionDate = _versionDate;
Runnable.Run(Examples());
}
private IEnumerator Examples()
{
Log.Debug("ExampleAssistantV2.Examples()", "Attempting to CreateSession");
_service.CreateSession(OnCreateSession, OnFail, _assistantId);
while (!_createSessionTested)
{
yield return null;
}
Log.Debug("ExampleAssistantV2.Examples()", "Attempting to Message");
_service.Message(OnMessage, OnFail, _assistantId, _sessionId);
while (!_messageTested)
{
yield return null;
}
Log.Debug("ExampleAssistantV2.Examples()", "Attempting to DeleteSession");
_service.DeleteSession(OnDeleteSession, OnFail, _assistantId, _sessionId);
while (!_deleteSessionTested)
{
yield return null;
}
Log.Debug("ExampleAssistantV2.Examples()", "Assistant examples complete.");
}
private void OnDeleteSession(object response, Dictionary<string, object> customData)
{
Log.Debug("ExampleAssistantV2.OnDeleteSession()", "Session deleted.");
_createSessionTested = true;
}
private void OnMessage(MessageResponse response, Dictionary<string, object> customData)
{
_messageTested = true;
}
private void OnCreateSession(SessionResponse response, Dictionary<string, object> customData)
{
Log.Debug("ExampleAssistantV2.OnCreateSession()", "Session: {0}", response.SessionId);
_sessionId = response.SessionId;
_createSessionTested = true;
}
private void OnFail(RESTConnector.Error error, Dictionary<string, object> customData)
{
Log.Debug("ExampleAssistantV2.OnFail()", "Call failed: {0}: {1}", error.ErrorCode, error.ErrorMessage);
}
}
}
抛出的错误代码：
[01/27/2019 09:33:18][Unity][CRITICAL] Unity Exception NullReferenceException: Object reference not set to an instance of an object : IBM.Watson.DeveloperCloud.Services.Assistant.v2.ExampleAssistantV2.OnFail (IBM.Watson.DeveloperCloud.Connection.Error error, System.Collections.Generic.Dictionary`2 customData) (at Assets/Watson/Examples/ServiceExamples/Scripts/ExampleAssistantV2.cs:157)
IBM.Watson.DeveloperCloud.Services.Assistant.v2.Assistant.OnCreateSessionResponse (IBM.Watson.DeveloperCloud.Connection.Request req, IBM.Watson.DeveloperCloud.Connection.Response resp) (at Assets/Watson/Scripts/Services/Assistant/v2/Assistant.cs:208)
IBM.Watson.DeveloperCloud.Connection.RESTConnector+<ProcessRequestQueue>c__Iterator0.MoveNext () (at Assets/Watson/Scripts/Connection/RESTConnector.cs:581)
IBM.Watson.DeveloperCloud.Utilities.Runnable+Routine.MoveNext () (at Assets/Watson/Scripts/Utilities/Runnable.cs:131)
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)
UnityEngine.Debug:LogError(Object)
IBM.Watson.DeveloperCloud.Debug.DebugReactor:ProcessLog(LogRecord) (at Assets/Watson/Scripts/Debug/DebugReactor.cs:60)
IBM.Watson.DeveloperCloud.Logging.LogSystem:ProcessLog(LogRecord) (at Assets/Watson/Scripts/Logging/Logger.cs:206)
IBM.Watson.DeveloperCloud.Logging.Log:Critical(String, String, Object[]) (at Assets/Watson/Scripts/Logging/Logger.cs:294)
IBM.Watson.DeveloperCloud.Logging.LogSystem:UnityLogCallback(String, String, LogType) (at Assets/Watson/Scripts/Logging/Logger.cs:167)
UnityEngine.Application:CallLogCallback(String, String, LogType, Boolean)
NullReferenceException: Object reference not set to an instance of an object
IBM.Watson.DeveloperCloud.Services.Assistant.v2.ExampleAssistantV2.OnFail (IBM.Watson.DeveloperCloud.Connection.Error error, System.Collections.Generic.Dictionary`2 customData) (at Assets/Watson/Examples/ServiceExamples/Scripts/ExampleAssistantV2.cs:157)
IBM.Watson.DeveloperCloud.Services.Assistant.v2.Assistant.OnCreateSessionResponse (IBM.Watson.DeveloperCloud.Connection.Request req, IBM.Watson.DeveloperCloud.Connection.Response resp) (at Assets/Watson/Scripts/Services/Assistant/v2/Assistant.cs:208)
IBM.Watson.DeveloperCloud.Connection.RESTConnector+<ProcessRequestQueue>c__Iterator0.MoveNext () (at Assets/Watson/Scripts/Connection/RESTConnector.cs:581)
IBM.Watson.DeveloperCloud.Utilities.Runnable+Routine.MoveNext () (at Assets/Watson/Scripts/Utilities/Runnable.cs:131)
UnityEngine.SetupCoroutine.InvokeMoveNext (IEnumerator enumerator, IntPtr returnValueAddress) (at C:/buildslave/unity/build/Runtime/Export/Coroutines.cs:17)
编辑： 注意，我是在不好的时候问这个问题的，所以我决定对其进行编辑，以查看它是否更有可能得到回答。仍然没有进展，无法完全弄清什么是null。任何见识将不胜感激。
答案 0 :(得分：0)
SDK已过时。不得不切换到Github上的那个。进行更新后，我不再收到错误。但是，在某些情况下，即使您稍微修改一下示例，就有机会收到NullReferenceException。
答案 1 :(得分：0)
该错误是由于不提供AssistantId导致的Assistant V2。较旧的版本没有对AssistantId进行空检查。来自github的最新版本应具有null检查。