jaxb - Cxf Wsdl2java 列表中的空条目消失

Question

我已经创建了一个带有 cxf 的 web 服务客户端 xew plugin用于列表展开

问题在于null在列表中消失。
例如。:

我有一个带有 List<String> 的请求带字符串和 null -入口

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

这是 wsdl 的示例:

[..]
<!-- 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>

示例请求:

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服务器端仍然存在条目？

Answer 1

问题在于 jaxb-xew-plugin 生成未命中的代码 nillable = true为 XmlElement的名单。

由插件生成:

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

所以看起来插件缺少 nillable包装值的属性。

我认为问题出在 this code part ，其中 XmlElement 被“提升”到外部元素和 nillable属性被省略。

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);
}

这个问题中讨论的问题从 得到解决。版本 1.7 jaxb-xew-plugin。 This issue跟踪那个案例， here是发布。