java - JAXB with XPATH Flexibility to modify Objects at runtime -

i want modify jaxb loaded objects (from xml) can marshall them disk updated xml.

now lets take example:

<customers>   <customer id="1" name="jack">     <address type="residence">       <firstline>1 saxon court</firstline>       <city>cy</city>     </address>   </customer>     <customer id="2" name="iain">     <address type="residence">       <firstline>104 bank road</firstline>       <city>ny</city>     </address>   </customer> </customers> 

now have multiple customers, want use xpath functionality handle of customer[@id=2] object can add/update address. if not use xpath functionality jaxb generated classes have "list<customer> customer" , have iterate through list of customer match desirable customer[@id=2].

can give me idea how object instance handle jaxb generated objects using xpath, can marshall update actual xml on disk. if cannot done through jaxb, can alternative solution read , write xmls using java objects xpath flexibility.

updated question sample code:

following sample code shows want achieve moxy/jaxb.

package org.soc.test.customers.moxy;  import java.io.file; import java.util.list; import javax.xml.bind.*;  public class unmarshaldemo {     public static void main(string[] args) throws exception {         org.eclipse.persistence.jaxb.jaxbcontext jc =    (org.eclipse.persistence.jaxb.jaxbcontext)     jaxbcontext.newinstance(customer.class);         file instancedoc = new file("input.xml");         customer customer = (customer) jc.createunmarshaller() .unmarshal(instancedoc);         list<phonenumber>  phones = jc.getvaluebyxpath(customer, "phone-number[@id=\"12\"]", null, list.class);         string customerid = jc.getvaluebyxpath(customer, "@id", null, string.class);         system.out.println("customerid " + customerid + "  ,  phone " + (phones==null?"0":phones.size()));         jc.setvaluebyxpath(customer, "phone-number[@id=\"12\"]/area-code/text()", null, "555");     jc.createmarshaller().marshal(customer, system.out);     } } 

input xml:

<?xml version="1.0" encoding="utf-8"?> <customer id="1141">     <first-name>jon</first-name>     <last-name>smith</last-name>     <phone-number id="11">         <area-code>515</area-code>         <number>2726652</number>     </phone-number>     <phone-number id="12">         <area-code>515</area-code>         <number>2726652</number>     </phone-number> </customer> 

xsd:

<?xml version="1.0" encoding="utf-8"?>  <xs:schema xmlns:xs="http://www.w3.org/2001/xmlschema"      elementformdefault="unqualified"      attributeformdefault="unqualified">     <xs:element name="customer">         <xs:complextype>             <xs:sequence>                 <xs:element name="first-name" type="stringmaxsize5"/>                 <xs:element name="last-name" type="stringmaxsize5"/>                 <xs:element ref="phone-number" maxoccurs="2"/>             </xs:sequence>             <xs:attribute name="id" type="xs:string"/>         </xs:complextype>     </xs:element>     <xs:element name="phone-number">         <xs:complextype>             <xs:sequence>                 <xs:element name="area-code" type="stringmaxsize5"/>                 <xs:element name="number" type="xs:string"/>             </xs:sequence>             <xs:attribute name="id" type="xs:string"/>         </xs:complextype>     </xs:element>     <xs:simpletype name="stringmaxsize5">         <xs:restriction base="xs:string">             <xs:maxlength value="5"/>         </xs:restriction>     </xs:simpletype> </xs:schema> 

jaxb.properties:

javax.xml.bind.context.factory=org.eclipse.persistence.jaxb.jaxbcontextfactory 

output: customerid 1141 , phone 0

i expecting list size of phone number 1 returning null.

hope helps in understanding problem facing.

thanks venkat

it's not supported moxy. org.eclipse.persistence.internal.oxm.context supports numeric indexes in square brackets. while xpathfragment understands , creates appropriate predicates, context ignores far searching match goes. i'd either raise bug, or tool.

see context source code (commit 7cedaac6cdf9384ae9a06129d6f9abd607f9e3c4, line 371 onwards) what's happening.