odd deserialization error with gwt 2.0.3
tekbe
it seems I've got bad luck with switching to gwt 2.0. In addition to
the problem described here:
http://groups.google.com/group/google-web-toolkit/browse_thread/thread/6680775a0c925397
the following error does not only occur in development mode but also
with the compiled JavaScript.
Trying to send a simple entity to the server like this
AdminConfiguration cfg = new AdminConfiguration();
cfg.setHelpText("Hello World.");
adminService.save(cfg, new VoidCallbackAdapter<Void>());
causes this odd exception (notice: the name of the missing class is
equal to the String-value):
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException:
java.lang.ClassNotFoundException: Hello World.
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:308)
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:166)
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:123)
at
net.anwaltsdatenbank.adb.server.controller.RpcController.processCall(RpcController.java:
37)
at
com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:
224)
at
com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:
62)
at
org.gwtwidgets.server.spring.GWTSpringController.handleRequest(GWTSpringController.java:
85)
at
org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:
48)
at
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:
771)
at
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:
716)
at
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:
647)
at
org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:
563)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:
487)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:
362)
at
org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:
216)
at
org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:
181)
at
org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:
729)
at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:
405)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at
org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:
49)
at
org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:
152)
at org.mortbay.jetty.Server.handle(Server.java:324)
at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:
505)
at org.mortbay.jetty.HttpConnection
$RequestHandler.content(HttpConnection.java:843)
at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
at
org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:
395)
at org.mortbay.thread.QueuedThreadPool
$PoolThread.run(QueuedThreadPool.java:488)
Caused by: com.google.gwt.user.client.rpc.SerializationException:
java.lang.ClassNotFoundException: Hello World.
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:
561)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:
61)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader
$ValueReader$8.readValue(ServerSerializationStreamReader.java:137)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeValue(ServerSerializationStreamReader.java:
384)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeClass(ServerSerializationStreamReader.java:
658)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeImpl(ServerSerializationStreamReader.java:
704)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserialize(ServerSerializationStreamReader.java:
548)
at
com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:
61)
at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader
$ValueReader$8.readValue(ServerSerializationStreamReader.java:137)
at
com.google.gwt.user.server.rpc.impl.ServerSerializationStreamReader.deserializeValue(ServerSerializationStreamReader.java:
384)
at com.google.gwt.user.server.rpc.RPC.decodeRequest(RPC.java:296)
... 30 more
I'm using gwt 2.0.3, JPA 2, spring 3.0.1 and the GWTSpringController
of gwt-sl 1.0. Before switching to gwt 2.0 everything worked fine.
This is the (JPA 2 annotated) entity:
@Entity
@Table(name="ADB_CONFIG")
public class AdminConfiguration implements PersistedEntity<Long> {
private static final long serialVersionUID = -3641405191548095235L;
@Id
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Long id;
@Version
private Long version;
@Lob
private String helpText;
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public void setVersion(Long version) {
this.version = version;
}
public Long getVersion() {
return version;
}
public String getHelpText() {
return helpText;
}
public void setHelpText(String helpText) {
this.helpText = helpText;
}
}
This is the remote service:
@Service("administrationService")
public class AdministrationServiceImpl implements
AdministrationService {
private static final long serialVersionUID = 4214929347647808921L;
private final Logger log =
LoggerFactory.getLogger(AdministrationServiceImpl.class);
private final AdminConfigurationDao adminConfigurationDao;
private final Hibernate3BeanReplicator beanReplicator = new
Hibernate3BeanReplicator();
@Inject
public AdministrationServiceImpl(AdminConfigurationDao
adminConfigurationDao) {
super();
this.adminConfigurationDao = adminConfigurationDao;
}
@Transactional
public AdminConfiguration loadConfiguration() {
log.debug("loading configuration.");
final List<AdminConfiguration> result =
adminConfigurationDao.findAll();
return result.size() > 0 ? beanReplicator.copy(result.get(0)) : new
AdminConfiguration();
}
@Transactional
public void save(AdminConfiguration cfg) {
log.debug("saving configuration");
adminConfigurationDao.persist(cfg);
}
}
Any help is highly appreciated. Thank you.
tekbe
same error as this one: http://groups.google.com/group/google-web-toolkit/browse_thread/thread/6680775a0c925397
because it also occurs with compiled code.
when removing the JPA 2 annotations the entity can be deserialized
(sent to the server). I copied the entity AdminConfiguration to class
AdminConfiguration2, removed the JPA 2 annotations and the call to
testService.sendConfig2() works (while sendConfig1() fails).
AdminConfiguration cfg1 = new AdminConfiguration();
cfg1.setHelpText("Hello World.");
testService.sendConfig1(cfg1, new VoidCallbackAdapter<Void>());
AdminConfiguration2 cfg2 = new AdminConfiguration2();
cfg2.setHelpText("Hello World.");
testService.sendConfig2(cfg2, new VoidCallbackAdapter<Void>());
this is the service:
@Service("testService")
public class TestServiceImpl implements TestService {
Logger log = LoggerFactory.getLogger(TestServiceImpl.class);
public void sendConfig1(AdminConfiguration cfg) {
log.debug("sendConfig1(): {}", cfg.getHelpText());
}
public void sendConfig2(AdminConfiguration2 cfg) {
log.debug("sendConfig2(): {}", cfg.getHelpText());
}
}
same workaround here: use data transfer objects