我试图用maven，gwt，gwt-platform和guice-persist做一个例子。
但是，我遇到了麻烦。
当我尝试使用mvn gwt:run运行示例时，我得到以下异常：
1) Error injecting constructor, javax.persistence.PersistenceException: [PersistenceUnit: exemplo] Unable to build EntityManagerFactory at br.net.meditec.Exemplo.server.inject.AppInitializer.<init>(AppInitializer.java:9) while locating br.net.meditec.Exemplo.server.inject.AppInitializer 1 error at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:987) at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013) at br.net.meditec.Exemplo.server.inject.GuiceServletConfig.getInjector(GuiceServletConfig.java:24) at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:45) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:543) at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672) at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509) at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068) at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811) at com.google.gwt.dev.DevMode.main(DevMode.java:311) Caused by: javax.persistence.PersistenceException: [PersistenceUnit: exemplo] Unable to build EntityManagerFactory at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:914) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:889) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60) at com.google.inject.persist.jpa.JpaPersistService.start(JpaPersistService.java:94) at br.net.meditec.Exemplo.server.inject.AppInitializer.<init>(AppInitializer.java:10) at br.net.meditec.Exemplo.server.inject.AppInitializer$$FastClassByGuice$$96bdac91.newInstance(<generated>) at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40) at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013) at br.net.meditec.Exemplo.server.inject.GuiceServletConfig.getInjector(GuiceServletConfig.java:24) at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:45) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:543) at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672) at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509) at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068) at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811) at com.google.gwt.dev.DevMode.main(DevMode.java:311) 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:146) 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:2273) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2269) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1738) at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:88) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:889) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60) at com.google.inject.persist.jpa.JpaPersistService.start(JpaPersistService.java:94) at br.net.meditec.Exemplo.server.inject.AppInitializer.<init>(AppInitializer.java:10) at br.net.meditec.Exemplo.server.inject.AppInitializer$$FastClassByGuice$$96bdac91.newInstance(<generated>) at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40) at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013) at br.net.meditec.Exemplo.server.inject.GuiceServletConfig.getInjector(GuiceServletConfig.java:24) at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:45) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:543) at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672) at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509) at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068) at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811) at com.google.gwt.dev.DevMode.main(DevMode.java:311) 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) at org.hibernate.service.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:64) at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:146) 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:2273) at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2269) at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1738) at org.hibernate.ejb.EntityManagerFactoryImpl.<init>(EntityManagerFactoryImpl.java:88) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:904) at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:889) at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:56) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:83) at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60) at com.google.inject.persist.jpa.JpaPersistService.start(JpaPersistService.java:94) at br.net.meditec.Exemplo.server.inject.AppInitializer.<init>(AppInitializer.java:10) at br.net.meditec.Exemplo.server.inject.AppInitializer$$FastClassByGuice$$96bdac91.newInstance(<generated>) at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40) at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60) at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85) at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254) at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978) at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024) at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974) at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013) at br.net.meditec.Exemplo.server.inject.GuiceServletConfig.getInjector(GuiceServletConfig.java:24) at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:45) at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:543) at org.mortbay.jetty.servlet.Context.startContext(Context.java:136) at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220) at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513) at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448) at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130) at org.mortbay.jetty.Server.doStart(Server.java:222) at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39) at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672) at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509) at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068) at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811) at com.google.gwt.dev.DevMode.main(DevMode.java:311)
如果我通过eclipse运行模块，我还有另一个例外：
1) Error injecting constructor, javax.persistence.PersistenceException: No Persistence provider for EntityManager named exemplo
at br.net.meditec.Exemplo.server.inject.AppInitializer.<init>(AppInitializer.java:9)
while locating br.net.meditec.Exemplo.server.inject.AppInitializer
1 error
at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:987)
at com.google.inject.internal.InjectorImpl.getInstance(InjectorImpl.java:1013)
at br.net.meditec.Exemplo.server.inject.GuiceServletConfig.getInjector(GuiceServletConfig.java:24)
at com.google.inject.servlet.GuiceServletContextListener.contextInitialized(GuiceServletContextListener.java:45)
at org.mortbay.jetty.handler.ContextHandler.startContext(ContextHandler.java:543)
at org.mortbay.jetty.servlet.Context.startContext(Context.java:136)
at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1220)
at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:513)
at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:448)
at com.google.gwt.dev.shell.jetty.JettyLauncher$WebAppContextWithReload.doStart(JettyLauncher.java:468)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.handler.RequestLogHandler.doStart(RequestLogHandler.java:115)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
at org.mortbay.jetty.Server.doStart(Server.java:222)
at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:39)
at com.google.gwt.dev.shell.jetty.JettyLauncher.start(JettyLauncher.java:672)
at com.google.gwt.dev.DevMode.doStartUpServer(DevMode.java:509)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:1068)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:811)
at com.google.gwt.dev.DevMode.main(DevMode.java:311)
Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named exemplo
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:89)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:60)
at com.google.inject.persist.jpa.JpaPersistService.start(JpaPersistService.java:94)
at br.net.meditec.Exemplo.server.inject.AppInitializer.<init>(AppInitializer.java:10)
at br.net.meditec.Exemplo.server.inject.AppInitializer$$FastClassByGuice$$96bdac91.newInstance(<generated>)
at com.google.inject.internal.cglib.reflect.$FastConstructor.newInstance(FastConstructor.java:40)
at com.google.inject.internal.DefaultConstructionProxyFactory$1.newInstance(DefaultConstructionProxyFactory.java:60)
at com.google.inject.internal.ConstructorInjector.construct(ConstructorInjector.java:85)
at com.google.inject.internal.ConstructorBindingImpl$Factory.get(ConstructorBindingImpl.java:254)
at com.google.inject.internal.InjectorImpl$4$1.call(InjectorImpl.java:978)
at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1024)
at com.google.inject.internal.InjectorImpl$4.get(InjectorImpl.java:974)
... 21 more
在第一个错误中，看起来它没有找到PostgreSQLDialect，在第二个错误中，似乎它没有找到persistence.xml本身。
我创建了一个包含以下内容的类，它的工作正常：
public class DaoInjectionTest {
public static void main(String[] args) {
Injector injector = Guice.createInjector(new DaoModule(),
new JpaPersistModule("exemplo"));
injector.getInstance(AppInitializer.class);
injector.getInstance(RacaDao.class).save(new Raca("cachorro pastor alemao"));
}
}
所以，我无法理解发生了什么。有人可以帮忙吗？
如果可以提供帮助，请code of my project is in github。
非常感谢。
答案 0 :(得分：1)