java - Issue with JAXB XMLAdapter marshalling -

i have requirement generate xml file below format using jaxb2, has both fixed , variable xml content.

what constraint?

the content of variable xml part should 1 of 5 different xml schema( planned have jaxb2.0 implemented 5 different java classes generate it) need embedded in fixed xml content.

xml format:

<user_info>   <header>     //fixed xml part      <msg_id>..</msg_id>      <type>...</type>   </header>   <user_type>    //  variable xml content                       // (usertype : admin, reviewer, auditer, enduser, reporter)     ........     </user_type> </user_info> 

what tried ?

i have created jaxb annotated java classes above xml metadata. variable xml part, used common parent class (baseusertype) extended 5 different classes <user_type>. , tried override marshall(..) operation using @xmljavatypeadapter. (as below)

jaxb annotated class:

@xmlrootelement(name="user_info") public class userinfo {      private header header;  //reference jaxb annotated class header.class      @xmljavatypeadapter(value=customxmladapter.class)     private baseusertype usertype; // base class - acts common type                                     //  5 different usertype jaxb annotated classes      // getters setters here..     // tried declare jaxb annotations @ getter method } 

custom xml adapter class:

public class customxmladapter extends xmladapter<writer, baseinfo> {         private marshaller marshaller=null;           @override          public baseinfo unmarshal(writer v) throws exception {              // implementations here...         }          @override          public writer marshal(baseinfo v) throws exception {                  outputstream outstream = new bytearrayoutputstream();                  writer strresult = new outputstreamwriter(outstream);                  if(v instanceof customerprofilerequest){                      getmarshaller().marshal((customerprofilerequest)v, strresult );                  }                  return strresult;          }          private marshaller getmarshaller() throws jaxbexception{                  if(marshaller==null){                          jaxbcontext jaxbcontext = jaxbcontext.newinstance(admin.class, reviewer.class, enduser.class, auditor.class, reporter.class);                         marshaller = jaxbcontext.createmarshaller();                  }                  return marshaller;          }  } 

where i'm struggling now?.

i'm not facing errors or warnings, xml being generated (as shown below). output not expected one. doesn't embeds variable xml part fixed 1 correctly.

output

 <user_info>         <header>             <msg_id>100</msg_id>            <type>static</type>         </header>         <user_type/> // empty element, though binded value properly.     </user_info> 

my questions :

1. why jaxb marshallers not embeds "customxmladapter" marshalled content parent 1 (userinfo.class).
2. do have any alternative option in jaxb simple?
3. how specify boundtype, valuetype in xmladapter. there specific type given in order embed content parent class marshalling?

an xmladapter works allowing convert domain object, value object jaxb can better handle purposes of marshalling/unmarshalling.

• http://blog.bdoughan.com/2010/12/jaxb-and-immutable-objects.html

if model objects other schemas sub classes of baseusertype, need make jaxbcontext aware of them. can when create jaxbcontext having colon separated string package names.

jaxbcontext jc = jaxbcontext.newinstance("com.example.common:com.example.foo:com.example.bar");