java SAML getUnmarshaller（元素）返回null

Question

我试图从XmlString构造XML对象，但getUnmarshaller（元素）返回null：

代码如下：

     try {
        InitializationService.initialize();
        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder docBuilder = documentBuilderFactory.newDocumentBuilder();
        Document document = docBuilder.parse(new ByteArrayInputStream(xmlString.trim().getBytes()));
        Element element = document.getDocumentElement();
        UnmarshallerFactory unmarshallerFactory = XMLObjectProviderRegistrySupport.getUnmarshallerFactory();
        org.opensaml.core.xml.io.Unmarshaller unmarshaller = unmarshallerFactory
              .getUnmarshaller(element); //This is coming out be null
        System.out.println(unmarshaller);
     } catch (Exception e) {
        e.printStackTrace();
     }

这是XMLString

static String xmlString ="<?xml version=\"1.0\"?>" +
          "  <!DOCTYPE address" +
          "  [" +
          "     <!ELEMENT address (buildingnumber, street, city, state, zip)>" +
          "     <!ATTLIST address xmlns CDATA #IMPLIED>" +
          "     <!ELEMENT buildingnumber (#PCDATA)>" +
          "     <!ELEMENT street (#PCDATA)>" +
          "     <!ELEMENT city (#PCDATA)>" +
          "     <!ELEMENT state (#PCDATA)>" +
          "     <!ELEMENT zip (#PCDATA)>" +
          "  ]>" +
          "" +
          "  <address>" +
          "    <buildingnumber> 29 </buildingnumber>" +
          "    <street> South Street</street>" +
          "    <city>Vancouver</city>" +
          "" +
          "    <state>BC</state>" +
          "    <zip>V6V 4U7</zip>" +
          "  </address>";

任何帮助都将不胜感激

Answer 1

OpenSAML3的初始化过程很可能存在问题。我猜unmarshallerFactory是空的。首先检查您是否具有以下依赖项：

<dependency>
    <groupId>org.opensaml</groupId>
    <artifactId>opensaml-saml-impl</artifactId>
    <version>3.0.x</version>
</dependency>

如果存在，则尝试手动初始化OpenSAML库，就像https://github.com/wso2-extensions/carbon-identity-saml-common/blob/931e6164ee64350b15c6aa6ae080a0c5fb280828/components/org.wso2.carbon.identity.saml.common.util/src/main/java/org/wso2/carbon/identity/saml/common/util/SAMLInitializer.java#L41-L85一样，然后您将获得正确的解组器

Answer 2

我不知道是否还需要，但是

DefaultBootstrap.bootstrap();

起初，我解决了这个问题