java - How to unmarshall xml with different namespaces -

i use jaxb 2.0 , want unmarshall xml getting validation errors. example if element or attribute missed. here xml want parse:

<?xml version="1.1" encoding="utf-8"?> <package version="2.0" xmlns="http://www.idpf.org/2007/opf">   <metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:opf="http://www.idpf.org/2007/opf">     <dc:title>title</dc:title>   </metadata> </package> 

my model classes:

@xmlaccessortype(xmlaccesstype.field) @xmlrootelement(name = "package") public class package {     @xmlelement(required = true)     public metadata metadata;      @xmlattribute(name = "version", required = true)     public string version; }  @xmlaccessortype(xmlaccesstype.field) @xmlrootelement(name = "metadata") public class metadata {      @xmlelement(namespace = "http://purl.org/dc/elements/1.1/", required = true)     public string title; } 

package-info.java has annotation:

@javax.xml.bind.annotation.xmlschema(namespace = "http://www.idpf.org/2007/opf", elementformdefault = javax.xml.bind.annotation.xmlnsform.qualified) 

and code unmarshalling:

    jaxbcontext jc = jaxbcontext.newinstance(package.class);     unmarshaller unmarshaller = jc.createunmarshaller();      final list<bytearrayoutputstream> outs = new arraylist<>();     jc.generateschema(new schemaoutputresolver(){         @override         public result createoutput(string namespaceuri, string suggestedfilename) throws ioexception {             bytearrayoutputstream out = new bytearrayoutputstream();             outs.add(out);             streamresult streamresult = new streamresult(out);             streamresult.setsystemid("");             return streamresult;         }});     streamsource[] sources = new streamsource[outs.size()];     (int i=0; i<outs.size(); i++) {         bytearrayoutputstream out = outs.get(i);         system.out.append(new string(out.tobytearray()));         sources[i] = new streamsource(new bytearrayinputstream(out.tobytearray()),"");     }     schemafactory sf = schemafactory.newinstance(xmlconstants.w3c_xml_schema_ns_uri);     schema schema = sf.newschema(sources);     unmarshaller.setschema(schema);      unmarshaller.seteventhandler(event -> {         system.out.append(event.tostring());         return true;     });     opf file = (opf) unmarshaller.unmarshal(opffile); 

it generates schema:

<?xml version="1.0" encoding="utf-8" standalone="yes"?> <xs:schema elementformdefault="qualified" version="1.0" targetnamespace="http://www.idpf.org/2007/opf" xmlns:tns="http://www.idpf.org/2007/opf" xmlns:xs="http://www.w3.org/2001/xmlschema" xmlns:ns1="http://purl.org/dc/elements/1.1/">   <xs:import namespace="http://purl.org/dc/elements/1.1/"/>   <xs:element name="metadata" type="tns:metadata"/>   <xs:element name="package" type="tns:package"/>   <xs:complextype name="package">     <xs:sequence>       <xs:element ref="tns:metadata"/>     </xs:sequence>     <xs:attribute name="version" type="xs:anysimpletype" use="required"/>   </xs:complextype>   <xs:complextype name="metadata">     <xs:sequence>       <xs:element ref="ns1:title"/>     </xs:sequence>   </xs:complextype> </xs:schema> <?xml version="1.0" encoding="utf-8" standalone="yes"?> <xs:schema version="1.0" targetnamespace="http://purl.org/dc/elements/1.1/" xmlns:xs="http://www.w3.org/2001/xmlschema">   <xs:element name="title" type="xs:string"/> </xs:schema> 

and during unmarshalling throw error: org.xml.sax.saxparseexception: src-resolve: cannot resolve name 'ns1:title' a(n) 'element declaration' component.

how should annotate classes parse xml file?

you have hands dirty resource resolver; below working code:

    jaxbcontext jc = jaxbcontext.newinstance(package.class); unmarshaller unmarshaller = jc.createunmarshaller();  final map<string, bytearrayoutputstream> outs = new hashmap<string, bytearrayoutputstream>();  jc.generateschema(new schemaoutputresolver(){     @override     public result createoutput(string namespaceuri, string suggestedfilename) throws ioexception{         bytearrayoutputstream out = new bytearrayoutputstream();         outs.put(suggestedfilename, out);         streamresult streamresult = new streamresult(out);         streamresult.setsystemid(suggestedfilename);         return streamresult;     }}); streamsource[] sources = new streamsource[outs.size()]; int = 0; (map.entry<string, bytearrayoutputstream> entry: outs.entryset()) {     system.out.append(new string(entry.getvalue().tobytearray()));     sources[i++] = new streamsource(new bytearrayinputstream(entry.getvalue().tobytearray()), entry.getkey()); } schemafactory sf = schemafactory.newinstance(xmlconstants.w3c_xml_schema_ns_uri); sf.setresourceresolver(new lsresourceresolver(){     @override     public lsinput resolveresource(string type, string namespaceuri, string publicid, string systemid, string baseuri){         bytearrayoutputstream bout = outs.get(systemid);         if(bout!=null){             return new dominputimpl(publicid, systemid, baseuri, new bytearrayinputstream(bout.tobytearray()), null);         }else             return null;     } }); schema schema = sf.newschema(sources); unmarshaller.setschema(schema); unmarshaller.seteventhandler(new validationeventhandler(){     @override     public boolean handleevent(validationevent event){         system.out.append(event.tostring());         return true;     } });  object obj = unmarshaller.unmarshal(new file("package.xml"));