com.google.gwt.user.client.rpc.SerializationException: Could not get type signature for class Line (when Save)

[Jorge Luis Pérez Medina]

The example is realized with Objectify 5.0.3. The case is produced when i trying save instances of Project. I obtain the error: "Could not get type signature for class Line"

Here the StackTrace and the Code of entities used, also the code that save the Project with the service used.

The StackTrace:

objc[6458]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.7.0_60.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.7.0_60.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
Initializing App Engine server
juil. 29, 2014 9:33:59 AM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml
INFOS: Successfully processed /Users/jperezmedina/Documents/workspace/TestCase/war/WEB-INF/appengine-web.xml
juil. 29, 2014 9:33:59 AM com.google.apphosting.utils.config.AbstractConfigXmlReader readConfigXml
INFOS: Successfully processed /Users/jperezmedina/Documents/workspace/TestCase/war/WEB-INF/web.xml
juil. 29, 2014 9:33:59 AM com.google.appengine.tools.development.SystemPropertiesManager setSystemProperties
INFOS: Overwriting system property key 'java.util.logging.config.file', value '/Applications/eclipse/appengine-java-sdk-1.9.6/config/sdk/logging.properties' with value 'WEB-INF/logging.properties' from '/Users/jperezmedina/Documents/workspace/TestCase/war/WEB-INF/appengine-web.xml'
juil. 29, 2014 9:33:59 AM com.google.apphosting.utils.jetty.JettyLogger info
INFOS: Logging to JettyLogger(null) via com.google.apphosting.utils.jetty.JettyLogger
juil. 29, 2014 9:34:06 AM com.google.apphosting.utils.jetty.JettyLogger info
INFOS: jetty-6.1.x
juil. 29, 2014 9:34:14 AM com.google.apphosting.utils.jetty.JettyLogger info
INFOS: Started SelectChannelConnector@0.0.0.0:8888
juil. 29, 2014 9:34:14 AM com.google.appengine.tools.development.AbstractModule startup
INFOS: Module instance default is running at http://localhost:8888/
juil. 29, 2014 9:34:14 AM com.google.appengine.tools.development.AbstractModule startup
INFOS: The admin console is running at http://localhost:8888/_ah/admin
juil. 29, 2014 9:34:14 AM com.google.appengine.tools.development.DevAppServerImpl doStart
INFOS: Dev App Server is now running
com.google.gwt.user.client.rpc.SerializationException: could not get type signature for class be.example.shared.model.Line
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:125)
    at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.serialize(Map_CustomFieldSerializerBase.java:53)
    at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.serialize(HashMap_CustomFieldSerializer.java:39)
    at com.google.gwt.user.client.rpc.core.java.util.HashMap_FieldSerializer.serial(HashMap_FieldSerializer.java:23)
    at com.google.gwt.user.client.rpc.impl.SerializerBase.serialize(SerializerBase.java:126)
    at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamWriter.serialize(ClientSerializationStreamWriter.java:183)
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:130)
    at be.example.shared.model.Session_FieldSerializer.serialize(Session_FieldSerializer.java:112)
    at be.example.shared.model.Session_FieldSerializer.serial(Session_FieldSerializer.java:132)
    at com.google.gwt.user.client.rpc.impl.SerializerBase.serialize(SerializerBase.java:126)
    at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamWriter.serialize(ClientSerializationStreamWriter.java:183)
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:130)
    at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.serialize(Collection_CustomFieldSerializerBase.java:44)
    at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.serialize(ArrayList_CustomFieldSerializer.java:39)
    at com.google.gwt.user.client.rpc.core.java.util.ArrayList_FieldSerializer.serial(ArrayList_FieldSerializer.java:23)
    at com.google.gwt.user.client.rpc.impl.SerializerBase.serialize(SerializerBase.java:126)
    at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamWriter.serialize(ClientSerializationStreamWriter.java:183)
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:130)
    at be.example.shared.model.Project_FieldSerializer.serialize(Project_FieldSerializer.java:51)
    at be.example.shared.model.Project_FieldSerializer.serial(Project_FieldSerializer.java:66)
    at com.google.gwt.user.client.rpc.impl.SerializerBase.serialize(SerializerBase.java:126)
    at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamWriter.serialize(ClientSerializationStreamWriter.java:183)
    at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamWriter.writeObject(AbstractSerializationStreamWriter.java:130)
    at be.example.client.TestCaseService_Proxy.saveProject(TestCaseService_Proxy.java:123)
    at be.example.client.TestCase.onModuleLoad(TestCase.java:46)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.google.gwt.dev.shell.ModuleSpace.onLoad(ModuleSpace.java:411)
    at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:200)
    at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:526)
    at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)
    at java.lang.Thread.run(Thread.java:745)

The entities:

@SuppressWarnings("serial")
@Entity
public class Project extends GenericEntity implements IsSerializable {
 @Index
 private String name;
 private User user;

 @Serialize
 private List<Session> sessions = new ArrayList<Session>();
 ...

@SuppressWarnings("serial")
@Entity
public class Session extends GenericEntity implements IsSerializable {
 private int rows;
 private int cols;
 private User user;
 private Date date;
 private String name;
 @Serialize
 private Vector<Line> transectsH = new Vector<Line>();
 @Serialize
 private Vector<Line> transectsV = new Vector<Line>();
 @Serialize
 private HashMap<Point, Line> mapperHorizontalLines = new HashMap<Point, Line>();
 @Serialize
 private HashMap<Point, Line> mapperVerticalLines = new HashMap<Point, Line>();
 ...

@SuppressWarnings("serial")
@Entity
public class Line extends GenericEntity implements IsSerializable {
 private Image image;
 private Object data;
 private Point coordinate;
 private boolean selected;
 ...

@SuppressWarnings("serial")
@Entity
public class Point extends GenericEntity implements IsSerializable {
 private double x;
 private double y;
 ...

@SuppressWarnings("serial")
@Entity
public class User extends GenericEntity implements IsSerializable {
 @Index
 private String username;
 private String email;
 ...

The code that save the class Project:

package be.example.client;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;

import be.example.shared.model.Line;
import be.example.shared.model.Point;
import be.example.shared.model.Project;
import be.example.shared.model.Session;
import be.example.shared.model.User;

import com.google.gwt.core.client.EntryPoint;

import com.google.gwt.user.client.rpc.AsyncCallback;

public class TestCase implements EntryPoint {

 private Session session;
 private User user;
 private Project project;
 private List<Session> sessions = new ArrayList<Session>();

 public void onModuleLoad() {

    // create the user
    user = new User();
    user.setUsername("username");
    user.setEmail("em...@gmail.com");

    // create the sessions
    session = new Session();
    session.setCols(4);
    session.setRows(6);
    session.setUser(user);
    session.setDate(new Date("07/22/2014"));
    session.setName("Test 001");

    // add horizontal lines
    addHorizontalLines(300, 10);

    sessions.add(session);

    // create the project and save it

    project = new Project("0001LN", user, sessions);

    Services.getSensportService().saveProject(project, new AsyncCallback<Project>() {

         @Override
         public void onFailure(Throwable caught) {
            caught.printStackTrace(); }

         @Override
         public void onSuccess(Project result) {
            System.out.println(result.getSessions().get(0).toString());
         }

      });
    }

    private void addHorizontalLines(int height, int padding) {
         if (session.getRows() != 0) {
            for (int k = 0; k <= height; k += (height / session.getRows())) {
               // create the line and add it to the session
               Line line = new Line();
               line.setData("HorizontalLine");
               line.setCoordinate(new Point(padding, 0.5 + k + padding));
               line.setImage(null);
               session.addHorizontalLine(line);
            }
         }
     }
}

The method saveProject of service used:

public Project saveProject(Project project) throws IllegalArgumentException {
     ProjectDAO dao = new ProjectDAO();
     Key<Project> key = dao.save(project);
     return dao.findById(key.getId());
 }

The genericDAO that save and find one Entity:

 public Key<T> save(T clazz) {
     return ofy().save().entity(clazz).now();
 }

 public T findById(Long id) {
     return ofy().load().type(this.entityClass).id(id).now();
 }

[Jeff Schnitzer]

This is a GWT question - you would probably get better results by asking on the GWT list.

My guess, however, is that you can't serialize and Object type via GWT-RPC.

Jeff

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