Soap Server引发了错误:'java.lang.NullPointerException'。如何调试?

时间:2015-05-17 19:45:40

标签: python web-services soap wsdl suds

我正在尝试从荷兰土地注册(WSDL here)调用SOAP Web服务。我首先尝试使用pysimplesoap library来做到这一点。虽然我确实得到了相关的xml,但是pysimplesoap给出了TypeError: Tag: IMKAD_Perceel invalid (type not found)(我创建了一个SO question about that here)。由于我怀疑这是pysimplesoap中的一个错误,我现在正在尝试使用suds library

在pysimplesoap中,以下返回正确的xml(但正如我所说的pysimplesoap给出了一个TypeError):

from pysimplesoap.client import SoapClient
client = SoapClient(wsdl='http://www1.kadaster.nl/1/schemas/kik-inzage/20141101/verzoekTotInformatie-2.1.wsdl', username=xxx, password=xxx, trace=True)
response = client.VerzoekTotInformatie(
    Aanvraag={
        'berichtversie': '4.7',  # Refers to the schema version: http://www.kadaster.nl/web/show?id=150593&op=/1/schemas/homepage.html
        'klantReferentie': 'MyReference1',  # Refers to something we can set ourselves.
        'productAanduiding': '1185',  # a four-digit code referring to whether the response should be in "XML" (1185), "PDF" (1191) or "XML and PDF" (1057).
        'Ingang': {
            'Object': {
                'IMKAD_KadastraleAanduiding': {
                    'gemeente': 'ARNHEM',
                    'sectie': 'AC',
                    'perceelnummer': '1234'
                }
            }
        }
    }
)

这产生了下面的xml:

<soap:Body>
  <VerzoekTotInformatieRequest xmlns="http://www.kadaster.nl/schemas/kik-inzage/20141101">
    <Aanvraag xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">
      <berichtversie xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">4.7</berichtversie>
      <klantReferentie xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">ARNHEM-AC-1234</klantReferentie>
      <productAanduiding xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">1185</productAanduiding>
      <Ingang xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">
        <Object xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">
          <IMKAD_KadastraleAanduiding xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">
            <gemeente xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">ARNHEM AC</gemeente>
            <sectie xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">AC</sectie>
            <perceelnummer xmlns="http://www.kadaster.nl/schemas/kik-inzage/ip-aanvraag/v20141101">5569</perceelnummer>
          </IMKAD_KadastraleAanduiding>
        </Object>
      </Ingang>
    </Aanvraag>
  </VerzoekTotInformatieRequest>
</soap:Body>

所以现在我尝试更改此代码以改为使用suds。到目前为止,我想出了这个:

from suds.client import Client
client = Client(url='http://www1.kadaster.nl/1/schemas/kik-inzage/20141101/verzoekTotInformatie-2.1.wsdl', username='xxx', password='xxx')
Aanvraag = client.factory.create('ns3:Aanvraag')
Aanvraag.berichtversie = '4.7'
Aanvraag.klantReferentie = 'MyReference1'
Aanvraag.productAanduiding = '1185'
IMKAD_KadastraleAanduiding = client.factory.create('ns3:IMKAD_KadastraleAanduiding')
IMKAD_KadastraleAanduiding.gemeente = 'ARNHEM'
IMKAD_KadastraleAanduiding.sectie = 'AC'
IMKAD_KadastraleAanduiding.perceelnummer = '1234'
Object = client.factory.create('ns3:Object')
Object.IMKAD_KadastraleAanduiding = IMKAD_KadastraleAanduiding
Ingang = client.factory.create('ns3:Ingang')
Ingang.Object = Object
Aanvraag.Ingang = Ingang

result = client.service.VerzoekTotInformatie(Aanvraag)

生成以下xml:

<ns2:Body>
  <ns0:VerzoekTotInformatieRequest>
    <ns0:Aanvraag>
      <ns1:berichtversie>4.7</ns1:berichtversie>
      <ns1:klantReferentie>MyReference1</ns1:klantReferentie>
      <ns1:productAanduiding>1185</ns1:productAanduiding>
      <ns1:Ingang>
        <ns1:Object>
          <ns1:IMKAD_KadastraleAanduiding>
            <ns1:gemeente>ARNHEM</ns1:gemeente>
            <ns1:sectie>AC</ns1:sectie>
            <ns1:perceelnummer>1234</ns1:perceelnummer>
          </ns1:IMKAD_KadastraleAanduiding>
        </ns1:Object>
      </ns1:Ingang>
    </ns0:Aanvraag>
  </ns0:VerzoekTotInformatieRequest>
</ns2:Body>

不幸的是,这会导致服务器返回Nullpointer:

Traceback (most recent call last):
  File "<input>", line 1, in <module>
    result = client.service.VerzoekTotInformatie(Aanvraag)
  File "/Library/Python/2.7/site-packages/suds/client.py", line 542, in __call__
    return client.invoke(args, kwargs)
  File "/Library/Python/2.7/site-packages/suds/client.py", line 602, in invoke
    result = self.send(soapenv)
  File "/Library/Python/2.7/site-packages/suds/client.py", line 649, in send
    result = self.failed(binding, e)
  File "/Library/Python/2.7/site-packages/suds/client.py", line 702, in failed
    r, p = binding.get_fault(reply)
  File "/Library/Python/2.7/site-packages/suds/bindings/binding.py", line 265, in get_fault
    raise WebFault(p, faultroot)
WebFault: Server raised fault: 'java.lang.NullPointerException'

这个错误当然非常无益。该错误没有提供任何关于导致NullPointer的提示。

如果我看一下pysimplesoap和suds通过网络发送的xml之间的区别,suds的xml缺少很多xmlns定义(尽管我不知道是否需要它们)和标签的名称包括例如ns0:的前缀。我不知道这些差异是否相关,我也不知道如何让suds创建与pysimplesoap相同的xml。

虽然wsdl file of the service是公开的,但服务本身是付费的(每年60欧元+每次成功请求3欧元)。因此,我认为阅读此内容的人很难/不可能重现此问题,而且我无法在此处提供我的用户凭据。

但是因为我真的坚持这个问题,也许有人可以给我一些如何调试这个的技巧?例如;如何让suds创建与pysimplesoap相同的xml?或者我如何获得有关nullpointer的更多信息?

欢迎任何帮助!

1 个答案:

答案 0 :(得分:0)

这不是一个答案,而是来自Python和SOAP的先前经验的建议。

  1. 找到一些好的(已建立的SOAP参考)Java工具,用于在给定WSDL的情况下进行SOAP查询。
  2. 制作一些您感兴趣的典型查询,并记录作为模板发送/接收的内容
  3. 忘记Python SOAP库,只使用模板查询SOAP端点(Python有许多模板语言)。
  4. 如果第2步失败并使用了突出的Java工具,请联系techsupport,了解您所支付的服务。

    您是否检查过Python SOAP客户端是否真正下载了所有这些优秀的XSD?