列表中的Cxf Wsdl2java null条目消失

我正在使用maven来生成ws客户端

    3.0.5
    0.6.5

[..]

    org.apache.cxf
    cxf-codegen-plugin
    ${cxf.version}
    
        
            generate-sources
            generate-sources
            
                src/main/java
                
                    
                        ${basedir}/jaxbBindings.xml
                        ${basedir}/jaxwsBindings.xml
                    
                    
                        
                        -xjc-Xxew
                        -xjc-Xxew:instantiate lazy

                        
                        -xjc-Xts:style:de.company.tostring.CustomToStringStyle.DEFAULT
                        -xjc-Xequals
                        -xjc-XhashCode
                    
                
                ${ws.dirAbsolute}
                
                    *.wsdl
                
            
            
                wsdl2java
            
        
    
    
        
            org.apache.cxf.xjcplugins
            cxf-xjc-ts
            ${cxf.version}
        
        
            org.jvnet.jaxb2_commons
            jaxb2-basics
            ${jaxbBasic.version}
        
        
            com.github.jaxb-xew-plugin
            jaxb-xew-plugin-fixed 
            1.7-SNAPSHOT
        
        
            com.sun.xml.bind
            jaxb-xjc
            2.2.11
        
    

    false

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