[Simple-support] Tutorial #3: "Nested object serialization" fails on deserialization

[Lee R. <le...@rh...>]

Hi,
I am a newbie so I started implementing & testing the examples from the
tutorial right from the top.
When I got to #3 "Nested object serialization", the forward serialization
worked like a charm.  However, the attempting the reverse deserialization
fails:

org.simpleframework.xml.core.PersistenceException: Constructor not matched
for class Security
at 
org.simpleframework.xml.core.ClassCreator.getInstance(ClassCreator.java:109)
at 
org.simpleframework.xml.core.Composite.readConstructor(Composite.java:288)
at org.simpleframework.xml.core.Composite.read(Composite.java:236)
at org.simpleframework.xml.core.Composite.read(Composite.java:202)
at org.simpleframework.xml.core.Composite.read(Composite.java:150)
at org.simpleframework.xml.core.Composite.readVariable(Composite.java:687)
at org.simpleframework.xml.core.Composite.readInstance(Composite.java:635)
at org.simpleframework.xml.core.Composite.readUnion(Composite.java:610)
at org.simpleframework.xml.core.Composite.readElement(Composite.java:593)
at org.simpleframework.xml.core.Composite.readElements(Composite.java:506)
at org.simpleframework.xml.core.Composite.readSection(Composite.java:388)
at org.simpleframework.xml.core.Composite.read(Composite.java:367)
at org.simpleframework.xml.core.Composite.read(Composite.java:234)
at org.simpleframework.xml.core.Composite.read(Composite.java:202)
at org.simpleframework.xml.core.Composite.read(Composite.java:150)
at org.simpleframework.xml.core.Composite.readVariable(Composite.java:687)
at org.simpleframework.xml.core.Composite.readInstance(Composite.java:635)
at org.simpleframework.xml.core.Composite.readUnion(Composite.java:610)
at org.simpleframework.xml.core.Composite.readElement(Composite.java:593)
at org.simpleframework.xml.core.Composite.readElements(Composite.java:506)
at org.simpleframework.xml.core.Composite.readSection(Composite.java:388)
at org.simpleframework.xml.core.Composite.read(Composite.java:367)
at org.simpleframework.xml.core.Composite.read(Composite.java:234)
at org.simpleframework.xml.core.Composite.read(Composite.java:202)
at org.simpleframework.xml.core.Composite.read(Composite.java:150)
at org.simpleframework.xml.core.Traverser.read(Traverser.java:92)
at org.simpleframework.xml.core.Persister.read(Persister.java:632)
at org.simpleframework.xml.core.Persister.read(Persister.java:613)
at org.simpleframework.xml.core.Persister.read(Persister.java:591)
at org.simpleframework.xml.core.Persister.read(Persister.java:550)
at org.simpleframework.xml.core.Persister.read(Persister.java:528)
at org.simpleframework.xml.core.Persister.read(Persister.java:433)
at 
com.yahoo.monarch.SimpleTutorial.deserializeConfiguration(SimpleTutorial.jav
a:72)
at com.yahoo.monarch.SimpleTutorial.main(SimpleTutorial.java:98)

The ClassCreator.getInstance(context, criteria) is getting a null back from
the getInitializer(context, criteria) method and throws the exception.

In order to load data into the classes for the forward serialization I added
simple constructors to the code shown in the tutorial (see below).
I presume those were omitted to reduce clutter.

Nonetheless, I'm stuck.  Any help would be appreciated.

Thanks!
Lee.

The concatenated code (minus imports):

<pre>
@Root
public class Configuration {

  @Element
  private Server server;

  @Attribute
  private int id;

  public Configuration(Server server, int id) {
    this.server = server;
    this.id = id;
  }
   
  public int getIdentity() { return id; }
  public Server getServer() { return server; }
  }

//***
public class Server {

  @Attribute
  private int port;

  @Element
  private String host;

  @Element
  private Security security;

  public Server(Security sec, String host, int port) {
    this.security = sec;
    this.host = host;
    this.port = port;
  }
    
  public int getPort() { return port; }
  public String getHost() { return host; }
  public Security getSecurity() { return security; }
 }

//***
public class Security {

  @Attribute
  private boolean ssl;

  @Element
  private String keyStore;

  public Security(boolean ssl, String keyStore) {
    this.ssl = ssl;
    this.keyStore = keyStore;
  }

  public boolean isSSL() { return ssl; }
  public String getKeyStore() { return keyStore; }
 }

//***
public static void serializeConfiguration() {  //This works
  //create hierarchy
  Security sec = new Security(true, "KeyStoreURL");
  Server server = new Server(sec, "myHost.yahoo.com", 8080);
  Configuration config = new Configuration(server, 101);
  //serialize to XML
  Serializer serializer = new Persister();
  File result = new File("configuration.xml");
  try {
    serializer.write(config, result);
  } catch (Exception e) {
    e.printStackTrace();
  }
}

public static void deserializeConfiguration() { //This fails
  Serializer serializer = new Persister();
  File source = new File("configuration.xml");
  Configuration config = null;
  try {
    config = serializer.read(Configuration.class, source); //Throws above
exception
  } catch (Exception e) {
    e.printStackTrace();
  }
  println("Class: Configuration");
  if (config != null) {
    Server svr = config.getServer();
    if (svr != null) {
      Security sec = svr.getSecurity();
      if (sec != null) {
        println("Security.ssl: "+sec.isSSL());
        println("Security.keyStore: "+sec.getKeyStore());
      }
      println("Server.host: "+svr.getHost());
      println("Server.port: "+svr.getPort());
    }
    println("Configuraiton.id: "+config.getIdentity());
  }
}
</pre>