Google Web Toolkit: Re: gwt application using hibernate and postgresql

Thank you very for your answers,

i have read and tried what you have suggested me. What i have noticed is that the main hibernate problem in gwt is that it cannot identify properly the entities of the class while passing from the client side to the server side. However, my entity class in my own application is never been accessed by the client side. All the instances are being used in the server side. Does this somehow affect the hibernate? Moreover, i have created an application using the default hibernate approach and i have the following error.

[error]

http://127.0.0.1:8888/isemanipulation/upload

Jan 5, 2012 11:25:18 PM org.hibernate.annotations.common.Version <clinit>

INFO: HCANN000001: Hibernate Commons Annotations {4.0.1.Final}

Jan 5, 2012 11:25:18 PM org.hibernate.Version logVersion

INFO: HHH000412: Hibernate Core {4.0.0.Final}

Jan 5, 2012 11:25:18 PM org.hibernate.cfg.Environment <clinit>

INFO: HHH000206: hibernate.properties not found

Jan 5, 2012 11:25:18 PM org.hibernate.cfg.Environment buildBytecodeProvider

INFO: HHH000021: Bytecode provider name : javassist

Jan 5, 2012 11:25:18 PM org.hibernate.service.jdbc.connections.internal.ConnectionProviderInitiator initiateService

WARN: HHH000181: No appropriate connection provider encountered, assuming application will be supplying connections

Jan 5, 2012 11:25:18 PM org.hibernate.dialect.Dialect <init>

INFO: HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect

[WARN] Error for /isemanipulation/upload

java.lang.ExceptionInInitializerError

at com.isemanipulation.server.fileUpload.FileUploadImpl.createHoney(FileUploadImpl.java:150)

at com.isemanipulation.server.fileUpload.FileUploadImpl.doPost(FileUploadImpl.java:87)

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: org.hibernate.HibernateException: Could not instantiate dialect class

at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.constructDialect(DialectFactoryImpl.java:82)

at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:64)

at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:170)

at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)

at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)

at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)

at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:71)

at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2270)

at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2266)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1735)

at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1775)

at com.isemanipulation.server.fileUpload.hibernate.SessionFactoryUtil.<clinit>(SessionFactoryUtil.java:28)

... 21 more

Caused by: java.lang.ClassCastException: org.hibernate.dialect.PostgreSQLDialect cannot be cast to org.hibernate.dialect.Dialect

at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.constructDialect(DialectFactoryImpl.java:73)

... 32 more

[WARN] Nested in java.lang.ExceptionInInitializerError:

org.hibernate.HibernateException: Could not instantiate dialect class