For more details I am adding here the class which is being unmarshalled, its
mapping file and how the unmarshaller is obtained. Please let me know if you
need anything else :
1. ScopeNode.java
public class ScopeNode extends GenericNode {
private List<UserNode> users;
private List<GroupNode> groups;
private List<RoleNode> roles;
private List<ContextNode> contexts;
private transient int enabVirRes;
public List<GroupNode> getGroups() {
return groups;
}
public void setGroups(List<GroupNode> groups1) {
this.groups = groups1;
}
public List<RoleNode> getRoles() {
return roles;
}
public void setRoles(List<RoleNode> roles1) {
this.roles = roles1;
}
public List<UserNode> getUsers() {
return users;
}
public void setUsers(List<UserNode> users1) {
this.users = users1;
}
public List<ContextNode> getContexts() {
return contexts;
}
public void setContexts(List<ContextNode> contexts1) {
this.contexts = contexts1;
}
public int getEnableVirtualResource() {
return enabVirRes;
}
public void setEnableVirtualResource(int enabVirRes1) {
this.enabVirRes = enabVirRes1;
}
****************************************
2. scopenode-mapping.xml
<mapping>
<include href="nvpair-mapping.xml"/>
<include href="rule-mapping.xml"/>
<include href="genericnode-mapping.xml"/>
<include href="rolenode-mapping.xml"/>
<include href="groupnode-mapping.xml"/>
<include href="usernode-mapping.xml"/>
<include href="contextnode-mapping.xml"/>
<class name="com.cisco.epm.pdp.cache.ScopeNode"
extends="com.cisco.epm.pdp.cache.GenericNode" >
<map-to xml="ScopeNode"/>
<field name="users" type="com.cisco.epm.pdp.cache.UserNode"
collection="arraylist">
<bind-xml name="users" node="element"/>
</field>
<field name="groups" type="com.cisco.epm.pdp.cache.GroupNode"
collection="arraylist">
<bind-xml name="groups" node="element"/>
</field>
<field name="roles" type="com.cisco.epm.pdp.cache.RoleNode"
collection="arraylist">
<bind-xml name="roles" node="element"/>
</field>
<field name="contexts"
type="com.cisco.epm.pdp.cache.ContextNode"
collection="arraylist">
<bind-xml name="contexts" node="element"/>
</field>
<field name="enabVirRes" type="integer" transient="true"
get-method="getEnableVirtualResource" set-method="setEnableVirtualResource">
<bind-xml name="enabVirRes" node="element"/>
</field>
</class>
</mapping>
****************************************
3. Code snippet for getting unmarshaller:
XMLContext xmlContext = getXMLContext();
Reader r = new BufferedReader(new InputStreamReader(is));
Unmarshaller unmarshaller = xmlContext.createUnmarshaller();
return unmarshaller.unmarshal(r);
XMLContext getXMLContext() throws Exception{
try {
xmlContext = new XMLContext();
Mapping mapping = new Mapping();
mapping.loadMapping(inputSource);
xmlContext.addMapping(mapping);
} catch (MappingException e) {
LOGGER.logError("Mapping of xml elements to class
members failed", e);
throw e;
}
}
here the inputSource is a instance variable which is initialized with Input
Stream of the mapping file of this object.I also verified that there is no
autocomplete attribute used in my mapping files.
Also a strange thing is when I use these mapping files to be read as files
rather than as input source it is working.
But currently I am reading the mapping files as :
InputStream mappingResource =
getClass().getClassLoader().getResourceAsStream("scopenode-mapping.xml");
inputSource = new InputSource(mappingResource);
Martin.Bolz wrote:
>
> Hi,
>
> thats strange even without a mapping file such a unmarshalling scenario
> works for me. Could you provide a little
> bit more detail? As far as I know reflection is not involved if you use a
> mapping-file (assuming you not specified the
> autocomplete feature in the mapping-file). Anyway could you also check
> your not using one of the static unmarshalling
> methods? This is a common mistake as your mapping-file is ignored then in
> unmarshalling.
>
> Regards,
>
> Martin
>
> -----Ursprüngliche Nachricht-----
> Von: avner21J [mailto:[email protected]]
> Gesendet: Montag, 21. Juni 2010 07:20
> An: [email protected]
> Betreff: [castor-user] org.exolab.castor.xml.MarshalException:Unable to
> instantiate java.util.List
>
>
> Hi,
>
> I am using castor (ver 1.3.1) to unmarshal an xml into a java object.
> This object has member variables as collections (List).
>
> Even though in the mapping file I used collections attribute of field tag
> and has set it to arraylist, it is still throwing this exception.
>
> After doing a bit of research on this,I found that since UnmarshalHandler
> uses reflection to create object from xml, it is trying to invoke
> java.util.List.newInstance() which might be the root of the problem.
>
> The class which I am trying to unmarshal is an already existing class and
> I
> cannot change the type of the member variables to ArrayList from List.
>
> Exception Trace is below:
>
> Caused by: java.lang.InstantiationException: java.util.List() method not
> found
> at
> org.exolab.castor.xml.UnmarshalHandler.createInstance(UnmarshalHandler.java:2584)
> at
> org.exolab.castor.xml.UnmarshalHandler.startElement(UnmarshalHandler.java:2348)
> at
> org.exolab.castor.xml.UnmarshalHandler.startElement(UnmarshalHandler.java:1436)
> at org.apache.xerces.parsers.AbstractSAXParser.startElement(Unknown
> Source)
> at
> org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanStartElement(Unknown
> Source)
>
> I am stuck with this. Please help me resolve this.
> --
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> Sent from the Castor - User mailing list archive at Nabble.com.
>
>
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