Exception when unmarshalling an "Interface"

An exception (java.lang.InstantiationError) is raised when unmarshalling an "Interface". Attached is a testcase below as well as the fix. The fix is a one liner in the convertAnother() in TreeUnmarshaller.java (below).

I apologize for not know how to generate a patch. I would appreciate if someone can tell me how do to it in eclipse.

Thanks in advance

chung-onn

TreeUnmarshaller.java
=====================

public Object convertAnother(Object parent, Class type) {
try

{ Converter converter = converterLookup.lookupConverterForType(type); //types.push(type); //the "bug" types.push(classMapper.lookupDefaultType(type)); //the fix Object result = converter.unmarshal(reader, this); types.popSilently(); return result; }

catch (ConversionException conversionException)

{ addInformationTo(conversionException, type); throw conversionException; }

catch (RuntimeException e)

{ ConversionException conversionException = new ConversionException(e); addInformationTo(conversionException, type); throw conversionException; }

}

Testcase
=======

import java.util.ArrayList;
import java.util.List;
import junit.framework.TestCase;

import com.thoughtworks.xstream.XStream;

public class XStreamTester extends TestCase {
public static void main(String[] args)

{ junit.textui.TestRunner.run(XStreamTester.class); }

/*

• Test alias for interface class
  */
  public void testAlias() { System.out.println("\nAlias with aliased xmlString"); XStream xs = new XStream(); xs.alias("addressBookInfo",AddressBookInfo.class,AddressBook.class); xs.alias("addressInfo",AddressInfo.class, Address.class); AddressBookInfo addrInfo = new AddressBook(); String xmlString = xs.toXML(addrInfo); System.out.println("***xmlstring:\n" +xmlString); AddressBookInfo addrInfo1 = (AddressBookInfo) xs.fromXML(xmlString); System.out.println(" Object:"+addrInfo1); System.out.println("***xmlString:\n"+xs.toXML(addrInfo1)); }

/*

• Test aliasing after from a non-alias xmlstring
  */
  public void testAlias1() { System.out.println("\nAlias without aliased xmlString"); XStream xs = new XStream(); AddressBookInfo addrInfo = new AddressBook(); String xmlString = xs.toXML(addrInfo); System.out.println("***xmlstring:\n" +xmlString); xs.alias("addressBookInfo",AddressBookInfo.class,AddressBook.class); xs.alias("addressInfo",AddressInfo.class, Address.class); AddressBookInfo addrInfo1 = (AddressBookInfo) xs.fromXML(xmlString); System.out.println(" Object:"+addrInfo1); System.out.println("***xmlString:\n"+xs.toXML(addrInfo1)); }

public interface AddressBookInfo

{ public List getAddresses(); public void setAddresses(List address); }

public class AddressBook implements AddressBookInfo {
private List addresses;

public AddressBook()

{ addresses = new ArrayList(); AddressInfo addr = new Address("Home","Home"); AddressInfo addr1 = new Address("Office","Office"); addresses.add(addr); addresses.add(addr1); }

public List getAddresses()

{ return addresses; }

public void setAddresses(List addresses)

{ this.addresses = addresses; }

}

public interface AddressInfo

{ public String getAddr1(); public String getAddr2(); public void setAddr1(String addr1); public void setAddr2(String addr2); }

public class Address implements AddressInfo {
private String addr1="addr1";
private String addr2="addr2";

public Address(String addr1, String addr2)

{ this.addr1 = addr1; this.addr2 = addr2; }

public String getAddr1()

{ return addr1; }

public String getAddr2()

{ return addr2; }

public void setAddr1(String addr1)

{ this.addr1 = addr1; }

public void setAddr2(String addr2)

{ this.addr2 = addr2; }

}

}