列表中的 Cxf Wsdl2java 空条目消失

Cxf Wsdl2java null entry in list disappear

我用 cxf 创建了一个网络服务客户端,xew plugin 用于列表展开

问题是列表中的 null 消失了。 例如:

我有一个带有 List<String> 字符串和 null-entry

的请求

当请求现在到达服务器时,它只包含字符串而不是 null 条目。所以示例列表中只有 2 个条目。

这里是一个 wsdl 的例子:

[..]
<!-- the request -->
<xsd:element name="createGroup">
    <xsd:complexType>
        <xsd:sequence>
            <xsd:element maxOccurs="1" minOccurs="1" name="in0" nillable="true" type="xsd:string"/>
            <xsd:element maxOccurs="1" minOccurs="1" name="in1" nillable="true" type="ns2:ArrayOfRole"/>
        </xsd:sequence>
    </xsd:complexType>
</xsd:element>
[..]
<!-- the list which will be unwrapped -->
<xsd:complexType name="ArrayOfRole">
    <xsd:sequence>
        <xsd:element maxOccurs="unbounded" minOccurs="0" name="Role" nillable="true" type="xsd:String"/>
    </xsd:sequence>
</xsd:complexType>

我正在使用 maven 生成 ws 客户端

<properties>
    <cxf.version>3.0.5</cxf.version>
    <jaxbBasic.version>0.6.5</jaxbBasic.version>
</properties>
[..]
<plugin>
    <groupId>org.apache.cxf</groupId>
    <artifactId>cxf-codegen-plugin</artifactId>
    <version>${cxf.version}</version>
    <executions>
        <execution>
            <id>generate-sources</id>
            <phase>generate-sources</phase>
            <configuration>
                <sourceRoot>src/main/java</sourceRoot>
                <defaultOptions>
                    <bindingFiles>
                        <bindingFile>${basedir}/jaxbBindings.xml</bindingFile>
                        <bindingFile>${basedir}/jaxwsBindings.xml</bindingFile>
                    </bindingFiles>
                    <extraargs>
                        <!-- xew plugin for unwrapping list wrappers types NOTE: the args need to be over the others otherwise there are compilation errors -->
                        <extraarg>-xjc-Xxew</extraarg>
                        <extraarg>-xjc-Xxew:instantiate lazy</extraarg>

                        <!-- Generate toString, equals, hashcode methods -->
                        <extraarg>-xjc-Xts:style:de.company.tostring.CustomToStringStyle.DEFAULT</extraarg>
                        <extraarg>-xjc-Xequals</extraarg>
                        <extraarg>-xjc-XhashCode</extraarg>
                    </extraargs>
                </defaultOptions>
                <wsdlRoot>${ws.dirAbsolute}</wsdlRoot>
                <includes>
                    <include>*.wsdl</include>
                </includes>
            </configuration>
            <goals>
                <goal>wsdl2java</goal>
            </goals>
        </execution>
    </executions>
    <dependencies>
        <dependency>
            <groupId>org.apache.cxf.xjcplugins</groupId>
            <artifactId>cxf-xjc-ts</artifactId>
            <version>${cxf.version}</version>
        </dependency>
        <dependency>
            <groupId>org.jvnet.jaxb2_commons</groupId>
            <artifactId>jaxb2-basics</artifactId>
            <version>${jaxbBasic.version}</version>
        </dependency>
        <dependency>
            <groupId>com.github.jaxb-xew-plugin</groupId>
            <artifactId>jaxb-xew-plugin-fixed</artifactId> <!-- this is a custom version with a small modification see https://github.com/dmak/jaxb-xew-plugin/issues/44 -->
            <version>1.7-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-xjc</artifactId>
            <version>2.2.11</version>
        </dependency>
    </dependencies>
</plugin>

jaxbBindings.xml

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<jaxb:bindings version="2.1" xmlns:jaxb="http://java.sun.com/xml/ns/jaxb">
    <jaxb:globalBindings generateElementProperty="false"/>
</jaxb:bindings>

jaxwsBindings.xml

<jaxws:bindings xmlns:xs="http://www.w3.org/2001/XMLSchema"
            xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
            xmlns:jaxws="http://java.sun.com/xml/ns/jaxws"
            xmlns:jaxb="http://java.sun.com/xml/ns/jaxb">
    <jaxws:enableWrapperStyle>false</jaxws:enableWrapperStyle>
</jaxws:bindings>

样品请求:

final CreateGroup create = new CreateGroup();
create.setIn0("newgroup");
final List<String> roles = new ArrayList<String>();
roles.add("testrole");
roles.add(null);
roles.add("testrole2");
create.setIn1(roles);
final SamplePortType proxy = ..;
proxy.createGroup(create);

有没有办法让 null 条目仍然存在于服务器端?

我不确定这一点,但 JAXB 绑定中的 generateElementProperty 是否可能导致该问题?根据 documentation,如果 属性 设置为 false,JAXB 将无法往返所有 XML 文档。如果设置为 true,您将不得不处理 JAXBElement class 但是,正如文档所述:

The JAXBElement type roundtrips the XML representation of name element across an unmarshal/marshal operation.

查看该页面中的示例,可能会有帮助。

问题是 jaxb-xew-plugin 生成的代码遗漏了 nillable = true 对于列表的 XmlElement

由插件生成:

@XmlElementWrapper(required = true, nillable = true)
@XmlElement(name = "Role", namespace = "http://www.whosebug.com/example")
protected List<String> in1;

如果您尝试添加 nillable=true,它将起作用:

@XmlElementWrapper(required = true, nillable = true)
@XmlElement(name = "Role", namespace = "http://www.whosebug.com/example", nillable = true)
protected List<String> in1;

所以插件似乎缺少包装值的 nillable 属性。

我认为问题出在 this code part,其中 XmlElement 是 "lifted" 到外部元素并且 nillable 属性被遗漏了。

将以下代码片段添加到上述代码部分将解决您的问题并生成工作代码:

JExpression nillable = getAnnotationMemberExpression(xmlElementOriginalAnnotation, "nillable");
if (nillable != null) {
    xmlElementAnnotation.param("nillable", nillable);
}

此问题中讨论的问题已在 jaxb-xew-plugin 的 1.7 版本中解决。 This issue keeps track of that case, here 是版本。