Question

我试图在ChangeGear 5.0上搜索一张票。他们的API使用SOAP请求，当我运行搜索请求时，我得到错误＆＃34;对象引用没有设置为对象的实例＆＃34;。我已经查看了有关同一问题的现有主题（其中有很多），并且我已经尝试了所有这些但没有运气。非必需参数作为空标记包含在内而不是完全省略，我已经尝试过大写参数名称，并且我已经确保根据WSDL对请求进行了适当的格式化。

提供的ChangeGear 5.0文档指定构造如下所示的请求：

POST /cgweb/cgwebservices/cgwebservices.asmx HTTP/1.1
Host: ...
Content-Type: application/soap+xml; charset=utf-8

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <Search xmlns="http://www.sunviewsoftware.com/CGWebServices/">
      <sessionId>string</sessionId>
      <entityType>string</entityType>
      <criteria>string</criteria>
      <retrieveRelated>boolean</retrieveRelated>
      <entityTemplate>string</entityTemplate>
    </Search>
  </soap12:Body>
</soap12:Envelope>

这是我使用指定标题发布的请求：

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <Search xmlns="http://www.sunviewsoftware.com/CGWebServices/">
      <sessionId></sessionId>
      <entityType></entityType>
      <criteria></criteria>
      <retrieveRelated>true</retrieveRelated>
      <entityTemplate></entityTemplate>
    </Search>
  </soap12:Body>
</soap12:Envelope>

我设置的唯一参数是retrieveRelated，因为WSDL指定它是唯一必需的参数，但我也尝试将所有字符串参数设置为任意非空值并得到了相同的结果。我确定API正常运行，因为当我使用登录操作时，它会成功返回：

POST /cgweb/cgwebservices/cgwebservices.asmx HTTP/1.1
Host: ...
Content-Type: application/soap+xml; charset=utf-8

<?xml version="1.0" encoding="utf-8"?>
<soap12:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:soap12="http://www.w3.org/2003/05/soap-envelope">
  <soap12:Body>
    <Login xmlns="http://www.sunviewsoftware.com/CGWebServices/">
      <userName>...</userName>
      <password>...</password>
    </Login>
  </soap12:Body>
</soap12:Envelope>

结果：

200 OK
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Body>
    <LoginResponse xmlns="http://www.sunviewsoftware.com/CGWebServices/">
      <LoginResult>...</LoginResult>
    </LoginResponse>
  </soap:Body>
</soap:Envelope>

我使用的是与登录操作相同的会话。还有什么我可以尝试除了包含空标签的省略参数或大写他们的名字？完整的错误是：

500 Internal Server Error
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://www.w3.org/2003/05/soap-envelope" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Body>
    <soap:Fault>
      <soap:Code>
        <soap:Value>soap:Receiver</soap:Value>
      </soap:Code>
      <soap:Reason>
        <soap:Text xml:lang="en">Object reference not set to an instance of an object.</soap:Text>
      </soap:Reason>
      <soap:Node>.../cgweb/cgwebservices/cgwebservices.asmx</soap:Node>
      <detail>
        <Error xmlns=".../cgweb/cgwebservices/cgwebservices.asmx">
          <ErrorNumber>0</ErrorNumber>
          <ErrorMessage/>
          <ErrorCode>L_REJECT_CHANGES_FAILED</ErrorCode>
        </Error>
        <Error xmlns=".../cgweb/cgwebservices/cgwebservices.asmx">
          <ErrorNumber>0</ErrorNumber>
          <ErrorMessage>Object reference not set to an instance of an object.</ErrorMessage>
          <ErrorCode>Object reference not set to an instance of an object.</ErrorCode>
        </Error>
        <Error xmlns=".../cgweb/cgwebservices/cgwebservices.asmx">
          <ErrorNumber>0</ErrorNumber>
          <ErrorMessage>Object reference not set to an instance of an object.</ErrorMessage>
          <ErrorCode/>
        </Error>
      </detail>
    </soap:Fault>
  </soap:Body>
</soap:Envelope>

Answer 1

问题是服务器没有遵守WSDL。 entityTemplate参数是必需的，如果没有它，服务器将返回未设置为对象实例的＆＃34; Object引用＆＃34;错误。当我最初使用虚拟值测试参数时，出于巧合，我偶然忘记设置这个 - 唯一一个偏离WSDL规范的人。

SOAP对象引用未设置为对象的实例

1 个答案: