xml - XJC - [错误]编译器无法支持此属性自定义

Question

我在尝试映射 java 属性中的元素时遇到了 xjc 的奇怪问题。我想在 Test2 上使用 test3 的 getter 和 setter。

我将我的绑定(bind)设置为:

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<jaxb:bindings xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:jaxb="http://java.sun.com/xml/ns/jaxb"
    version="2.1">
    <jaxb:globalBindings localScoping="toplevel" underscoreBinding="asCharInWord">
    </jaxb:globalBindings>
    <jaxb:bindings schemaLocation="test.xsd">
        <jaxb:schemaBindings>
            <jaxb:package name="test.detail" />
        </jaxb:schemaBindings>
        <jaxb:bindings node="//xsd:element[@name='TEST']">
            <jaxb:class name="Test"></jaxb:class>
        </jaxb:bindings>
        <jaxb:bindings node="//xsd:element[@name='TEST1']">
            <jaxb:class name="Test1" />
        </jaxb:bindings>
        <jaxb:bindings node="//xsd:element[@name='TEST2']">
            <jaxb:class name="Test2Impl" />
        </jaxb:bindings>
        <jaxb:bindings node="//xsd:element[@name='TEST3']">
            <jaxb:property name="test3" />
        </jaxb:bindings>
    </jaxb:bindings>
</jaxb:bindings>

我的 xsd 与此类似:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="" elementFormDefault="qualified"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
    xmlns:jaxb="http://java.sun.com/xml/ns/jaxb">
    <xsd:element name="TEST1">
        <xsd:complexType mixed="true">
            <xsd:sequence>
                <xsd:element name="TEST2" maxOccurs="unbounded">
                    <xsd:complexType mixed="true">
                        <xsd:sequence>
                            <xsd:element name="TEST3" minOccurs="0" type="xsd:string" />
                        </xsd:sequence>
                    </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="TEST">
        <xsd:complexType mixed="true">
            <xsd:sequence>
                <xsd:element ref="TEST1" minOccurs="0" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

当我尝试使用 xjc -b binding.xjb -d out test.xsd 生成时，我得到:

parsing a schema...
[WARNING] EmptyTargetNamespace: In schema document 'jaxb-generate-test/test.xsd',
the value of the 'targetNamespace' attribute cannot be an empty string.
  line 3 of jaxb-generate-test/test.xsd

[ERROR] compiler was unable to honor this property customization. 
It is attached to a wrong place, or its inconsistent with other bindings.
  line 20 of jaxb-generate-test/binding.xjb

[ERROR] (the above customization is attached to the following location in the schema)
  line 10 of jaxb-generate-test/test.xsd

Failed to parse a schema.

我创建了一个github project你可以测试一下。

Answer 1

首先，您需要修复 XSD，以便定义与 targetNamespace 关联并且元素引用正确。

尝试:

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema targetNamespace="http://myns" elementFormDefault="qualified"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:jaxb="http://java.sun.com/xml/ns/jaxb" xmlns:tns="http://myns">
    <xsd:element name="TEST1">
        <xsd:complexType mixed="true">
            <xsd:sequence>
                <xsd:element name="TEST2" maxOccurs="unbounded">
                    <xsd:complexType mixed="true">
                        <xsd:sequence>
                            <xsd:element name="TEST3" minOccurs="0" type="xsd:string" />
                        </xsd:sequence>
                    </xsd:complexType>
                </xsd:element>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
    <xsd:element name="TEST">
        <xsd:complexType mixed="true">
            <xsd:sequence>
                <xsd:element ref="tns:TEST1" minOccurs="0" />
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>

但是，您仍然遇到更困难的问题，即如何在其余混合内容中挑选出具有“test3”getter 的 TEST3 子元素。 JAXB 会将它们全部映射到一个列表中。

查看其他帖子，如 this它看起来像 JAXB2 Simplify plugin也许能够帮助您解决用例。

(也许有人会写一个更好的答案，更详细地说明如何操作，但这可能足够有帮助，我可以按原样发布)。