Hi all, I guess this should be easy for some of you experts, so I hope to get an answer here, after searching for this bug for a couple of hours now. Here's the situation: | @XmlJavaTypeAdapter(AbstractInodeImpl.Adapter.class) | public interface Inode extends Serializable, Comparable<Inode>, Cloneable | { | //definition of getters,setters,... | } | | @Entity | @Table(name="inode") | @Inheritance(strategy=InheritanceType.SINGLE_TABLE) | @DiscriminatorColumn( | name="type", | discriminatorType=DiscriminatorType.STRING | ) | | @XmlSeeAlso({FileInode.class, DirectoryInode.class}) | public abstract class AbstractInodeImpl implements Inode | { | //implementation of getters,setters,... | | static public class Adapter extends XmlAdapter<AbstractInodeImpl, Inode> | { | public Inode unmarshal(AbstractInodeImpl v) | { | return v; | } | public AbstractInodeImpl marshal(Inode v) | { | return (AbstractInodeImpl)v; | } | } | } | | @Entity | @Name("directoryInode") | @DiscriminatorValue("directory") | public class DirectoryInode extends AbstractInodeImpl implements Serializable | { | // more implementation | } | | @Entity | @Name("fileInode") | @DiscriminatorValue("file") | public class FileInode extends AbstractInodeImpl implements Serializable | { | // even more... | } | | @Stateless | @WebService(name = "FileSystemService", serviceName = "FileSystemService") | @Name("fileSystemService") | @WebContext(contextRoot="/tumbolia/services", urlPattern="/FileSystemService") | public class FileSystemServiceImpl implements FileSystemService, Serializable | { | @WebMethod | public List<Inode> getAllChildren(String inodePath) | { | List<Inode> children = ((FileSystemManager)Component.getInstance("fileSystemManager", true)).getInodePathChildren(inodePath); | | return children; | } | } | I generate my JAXB beans with wsconsume or wsimport (have tried both) from the wsdl that was automatically generated. When I call the webservice in the last bean, I get this exception: | [javax.xml.bind.UnmarshalException: Unable to create an instance of com.acepostproduction.tumbolia.webservice.AbstractInodeImpl | - with linked exception: | [java.lang.InstantiationException]] | com.acepostproduction.virtuolia.exceptions.WsException: [TumboliaFileSystemCommunicator] Error while calling getAllChildren(): javax.xml.bind.UnmarshalException | - with linked exception: | [javax.xml.bind.UnmarshalException: Unable to create an instance of com.acepostproduction.tumbolia.webservice.AbstractInodeImpl | - with linked exception: | [java.lang.InstantiationException]] | at com.acepostproduction.virtuolia.communicator.TumboliaFileSystemCommunicator.getAllChildren(TumboliaFileSystemCommunicator.java:87) | at com.acepostproduction.virtuolia.VirtuoliaDiskDriver.startSearch(VirtuoliaDiskDriver.java:340) | ... | Any ideas why the polymorphism on the return value is failing? It would be great if someone could give me a hint here. bram View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4112791#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...