向soap请求添加附件

Question

当我尝试在soap请求中附加图像时，我在soapUI中收到以下错误

<env:Envelope xmlns:env="http://schemas.xmlsoap.org/soap/envelope/">
<env:Header/>
<env:Body>
  <env:Fault>
     <faultcode>env:Server</faultcode>
     <faultstring>Cannot set an Object of type 'java.awt.image.BufferedImage' as a message attachment.  Attachment objects must be Serializable.</faultstring>
  </env:Fault>
 </env:Body>
</env:Envelope>

请有人帮我理解这个错误的含义，并帮助我解决这个错误，以便我能得到所需的结果