Not entirely sure if this is Seam 2.0B1 related, but I'm encountering some problems after upgrading where I'm getting an "org.hibernate.MappingException: Unknown entity:" message every time I try to update a form that uses a s:selectItems. I'm encountering this problem in two scenarios: (1) @OneToOne with lazy fetching enabled. (2) @ManyToOne--regardless if lazy fetching is turned on or not. I noticed that EntityConverterStore is picking up the first option in the selection list as the proxied-version of the entity, whose value expression is specified on the selectOneMenu component. This is why it's causing the problem. But why is it doing that? I suspect that when loading the entire list to fill the dropdown, the EM is loading a previously cached proxied of the entity. Any ideas how to fix this problem? ## components.xml | <fwk:entity-query name="regions" ejbql="select r from Region r"/> | ## Location.java | @Entity | public class Location { | | @OneToOne(fetch = FetchType.LAZY) | @JoinColumn(name = "regionid", nullable = false) | private Region region; | | ## location.xhtml | | <h:selectOneMenu required="true" | value="#{location.region}"> | <s:selectItems value="#{regions.resultList}" | var="region" | label="#{region.regionName}" | noSelectionLabel="Please select" | hideNoSelectionLabel="true"/> | <s:convertEntity/> | </h:selectOneMenu> | Stack trace | 14:36:37,506 [http-127.0.0.1-8080-2] ERROR DebugPageHandler:23 - redirecting to debug page | org.hibernate.MappingException: Unknown entity: a.b.c.Region_$$_javassist_54 | at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550) | at org.hibernate.event.def.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:68) | at org.hibernate.impl.SessionImpl.fireLoad(SessionImpl.java:878) | at org.hibernate.impl.SessionImpl.get(SessionImpl.java:815) | at org.hibernate.impl.SessionImpl.get(SessionImpl.java:808) | at org.hibernate.ejb.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:174) | at org.jboss.seam.persistence.EntityManagerProxy.find(EntityManagerProxy.java:85) | at org.jboss.seam.framework.EntityIdentifier.find(EntityIdentifier.java:32) | at org.jboss.seam.ui.converter.EntityConverterStore.get(EntityConverterStore.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:597) | at org.jboss.seam.util.Reflections.invoke(Reflections.java:21) | at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:31) | at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56) | at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:31) | at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) | at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:38) | at org.jboss.seam.util.Work.workInTransaction(Work.java:39) | at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:32) | at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) | at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:42) | at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68) | at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:106) | at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:151) | at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:87) | at org.jboss.seam.ui.converter.EntityConverterStore_$$_javassist_59.get(EntityConverterStore_$$_javassist_59.java) | at org.jboss.seam.ui.converter.EntityConverter.getAsObject(EntityConverter.java:88) | at com.sun.faces.renderkit.html_basic.HtmlBasicInputRenderer.getConvertedValue(HtmlBasicInputRenderer.java:152) | at com.sun.faces.renderkit.html_basic.MenuRenderer.convertSelectOneValue(MenuRenderer.java:197) | at com.sun.faces.renderkit.html_basic.MenuRenderer.getConvertedValue(MenuRenderer.java:359) | at javax.faces.component.UIInput.getConvertedValue(UIInput.java:934) | at javax.faces.component.UIInput.validate(UIInput.java:860) | at javax.faces.component.UIInput.executeValidate(UIInput.java:1065) | at javax.faces.component.UIInput.processValidators(UIInput.java:666) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030) | at javax.faces.component.UIForm.processValidators(UIForm.java:229) | at javax.faces.component.UIComponentBase.processValidators(UIComponentBase.java:1030) | at javax.faces.component.UIViewRoot.processValidators(UIViewRoot.java:662) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.access$201(AjaxViewRoot.java:53) | at org.ajax4jsf.framework.ajax.AjaxViewRoot$3.invokeRoot(AjaxViewRoot.java:315) | at org.ajax4jsf.framework.ajax.JsfOneOneInvoker.invokeOnRegionOrRoot(JsfOneOneInvoker.java:53) | at org.ajax4jsf.framework.ajax.AjaxContext.invokeOnRegionOrRoot(AjaxContext.java:191) | at org.ajax4jsf.framework.ajax.AjaxViewRoot.processValidators(AjaxViewRoot.java:329) | at com.sun.faces.lifecycle.ProcessValidationsPhase.execute(ProcessValidationsPhase.java:100) | at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:251) | at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:117) | at javax.faces.webapp.FacesServlet.service(FacesServlet.java:244) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83) | at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:87) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:46) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:73) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:127) | at org.ajax4jsf.framework.ajax.xmlfilter.BaseFilter.doFilter(BaseFilter.java:277) | at org.jboss.seam.web.Ajax4jsfFilter.doFilter(Ajax4jsfFilter.java:40) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.debug.hot.HotDeployFilter.doFilter(HotDeployFilter.java:63) | at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69) | at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:140) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96) | at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235) | at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) | at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) | at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175) | at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:179) | at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) | at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:84) | at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128) | at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) | at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:156) | at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) | at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:241) | at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844) | at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:580) | at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447) | View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4059399#... 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