I am using a simple Seam-Gen generated application. I want to change the @Id 
field in the model class to be auto-generated. I changed the annotation to read 
as follows:
        @Id @GeneratedValue(strategy=GenerationType.AUTO)

When I run the application the EntityHome.persist throws an exception. Here is 
the stack trace:

  | avax.servlet.ServletException: Error calling action method of component 
with id optionalParent:save
  |     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:152)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63)
  |     at 
org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)
  |     at 
org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
  |     at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
  |     at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
  |     at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
  |     at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
  |     at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
  |     at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  |     at 
org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
  |     at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
  |     at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
  |     at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
  |     at 
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
  |     at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
  |     at 
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
  |     at java.lang.Thread.run(Thread.java:595)
  | 2007-08-15 16:16:36,421 ERROR [org.jboss.seam.web.ExceptionFilter] 
exception root cause
  | javax.faces.FacesException: Error calling action method of component with 
id optionalParent:save
  |     at 
org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
  |     at javax.faces.component.UICommand.broadcast(UICommand.java:106)
  |     at 
org.ajax4jsf.framework.ajax.AjaxViewRoot.processEvents(AjaxViewRoot.java:180)
  |     at 
org.ajax4jsf.framework.ajax.AjaxViewRoot.broadcastEvents(AjaxViewRoot.java:158)
  |     at 
org.ajax4jsf.framework.ajax.AjaxViewRoot.processApplication(AjaxViewRoot.java:329)
  |     at 
org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:343)
  |     at 
org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
  |     at javax.faces.webapp.FacesServlet.service(FacesServlet.java:137)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:63)
  |     at 
org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:60)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:57)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:79)
  |     at 
org.jboss.seam.web.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:49)
  |     at org.jboss.seam.web.SeamFilter.doFilter(SeamFilter.java:84)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:96)
  |     at 
org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:220)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
  |     at 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
  |     at 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
  |     at 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
  |     at 
org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:175)
  |     at 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:432)
  |     at 
org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:74)
  |     at 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
  |     at 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
  |     at 
org.jboss.web.tomcat.tc5.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156)
  |     at 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
  |     at 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
  |     at 
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
  |     at 
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
  |     at 
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
  |     at 
org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
  |     at java.lang.Thread.run(Thread.java:595)
  | Caused by: javax.faces.el.EvaluationException: /OptionalParentEdit.xhtml 
@54,67 action="#{optionalParentHome.persist}": 
javax.persistence.PersistenceException: 
org.hibernate.PersistentObjectException: detached entity passed to persist: 
com.genasys.testproject.optionalparent.OptionalParent
  |     at 
com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:73)
  |     at 
org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
  |     ... 43 more
  | Caused by: javax.persistence.PersistenceException: 
org.hibernate.PersistentObjectException: detached entity passed to persist: 
com.genasys.testproject.optionalparent.OptionalParent
  |     at 
org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:647)
  |     at 
org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:218)
  |     at 
org.jboss.seam.persistence.EntityManagerProxy.persist(EntityManagerProxy.java:128)
  |     at org.jboss.seam.framework.EntityHome.persist(EntityHome.java:48)
  |     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  |     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |     at java.lang.reflect.Method.invoke(Method.java:585)
  |     at org.jboss.seam.util.Reflections.invoke(Reflections.java:20)
  |     at 
org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31)
  |     at 
org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:57)
  |     at 
org.jboss.seam.interceptors.ManagedEntityIdentityInterceptor.aroundInvoke(ManagedEntityIdentityInterceptor.java:37)
  |     at 
org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  |     at 
org.jboss.seam.interceptors.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:34)
  |     at 
org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  |     at 
org.jboss.seam.interceptors.TransactionInterceptor$1.work(TransactionInterceptor.java:32)
  |     at org.jboss.seam.util.Work.workInTransaction(Work.java:37)
  |     at 
org.jboss.seam.interceptors.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:27)
  |     at 
org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  |     at 
org.jboss.seam.interceptors.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:27)
  |     at 
org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:69)
  |     at 
org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:103)
  |     at 
org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:151)
  |     at 
org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:87)
  |     at 
com.genasys.testproject.optionalparent.OptionalParentHome_$$_javassist_122.persist(OptionalParentHome_$$_javassist_122.java)
  |     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  |     at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
  |     at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
  |     at java.lang.reflect.Method.invoke(Method.java:585)
  |     at com.sun.el.parser.AstValue.invoke(AstValue.java:174)
  |     at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:286)
  |     at 
com.sun.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:68)
  |     at 
com.sun.facelets.el.LegacyMethodBinding.invoke(LegacyMethodBinding.java:69)
  |     ... 44 more
  | Caused by: org.hibernate.PersistentObjectException: detached entity passed 
to persist: com.genasys.testproject.optionalparent.OptionalParent
  |     at 
org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:79)
  |     at 
org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:38)
  |     at org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:618)
  |     at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:592)
  |     at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:596)
  |     at 
org.hibernate.ejb.AbstractEntityManagerImpl.persist(AbstractEntityManagerImpl.java:212)
  |     ... 75 more
  | 

Can anyone suggest the cause? What other changes do I need to make to support 
auto-generated ids?

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