Java 向Webservice请求添加自定义Soap头

我已经使用ApacheAxis2为webserivce生成了存根，我想向请求中添加自定义soap头，我希望soap头看起来像这样

<soapenv:Header xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><ns1:soapHeader xmlns:ns1="urn:oasis:names:core" soapenv:mustUnderstand="0"><ns1:Username>myuser</ns1:Username><ns1:Password>mypass</ns1:Password></ns1:soapHeader></soapenv:Header>

但我没有得到必要的soap头，这是我得到的

 <soapenv:Header xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><ns1:soapHeader xmlns:ns1="urn:oasis:names:core" soapenv:mustUnderstand="0"><ns1:Username>myuser</ns1:Username></ns1:soapHeader></soapenv:Header>

myuser

正如你看到的密码丢失，我想知道我做错了什么

 <soapenv:Header xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><ns1:soapHeader xmlns:ns1="urn:oasis:names:core" soapenv:mustUnderstand="0"><ns1:Username>myuser</ns1:Username></ns1:soapHeader></soapenv:Header>