我有一个带有 Seam 生成的 Entity 和 EntityHome 类型支持 bean 的输入表单。由于用户在保存输入的数据之前需要一个确认弹出对话框，因此我将自动生成的 'h:commandButton' 替换为 'a4j:commandButton' 并将一个模式面板附加到它的 'oncomplete' 事件中：
Edit.xhtml 输入表单位：
. . . . .
<div class="actionButtons">
<a:commandButton id="save"
value="Save"
oncomplete="#{rich:component('confirmCreatePanel')}.show();"
disabled="#{!userProjectRolesHome.wired}"
rendered="#{!userProjectRolesHome.managed}">
<s:conversationId/>
</a:commandButton>
</div>
<rich:popupPanel modal="true" id="confirmCreatePanel" moveable="false" resizeable="false" height="120">
<f:facet name="header">Confirm</f:facet>
<div class="actionButtons">
<rich:panel style="align:center;">
<h:outputText value="Are you sure you want to create this ?" />
<table width="100%">
<tbody>
<tr>
<td align="center" width="50%">
<a:commandButton type="submit" value="Yes" action="#{userProjectRolesHome.persist}"
oncomplete="#{rich:component('confirmCreatePanel')}.hide()"/>
</td>
<td align="center" width="50%">
<a:commandButton type="submit" value="No" onclick="#{rich:component('confirmCreatePanel')}.hide()"/>
</td>
</tr>
</tbody>
</table>
</rich:panel>
</div>
</rich:popupPanel>
当单击“保存”按钮时，“confirmCreatePanel”会弹出 OK，但是当用户单击 mod.panel 时“是”并调用“persist()”时，我会收到一个异常，抱怨成员变量为“无效的'。
如果我从“a4j:commandButton”或“h:commandButton”的“action”属性中调用“persist()”，一切正常。“未完成”处理把事情搞砸了，它曾经工作过。
相同的代码适用于 Seam 2.2.0.Final/RF3.3.3/JSF1.2。升级到 Seam2.3.0.Final/RF4/JSF2 后它现在不工作了这里有什么变化？
2013-02-06 12:57:50,394 ERROR [clahrc.session.UserProjectRolesHome] user-project-role persisting or emailing failed:
javax.validation.ConstraintViolationException: Validation failed for classes [clahrc.entity.UserProjectRoles] during persist time for groups [javax.validation.groups.Default, ]
List of constraint violations:[
ConstraintViolationImpl{interpolatedMessage='may not be null', propertyPath=projects, rootBeanClass=class clahrc.entity.UserProjectRoles, messageTemplate='{javax.validation.constraints.NotNull.message}'}
ConstraintViolationImpl{interpolatedMessage='may not be null', propertyPath=users, rootBeanClass=class clahrc.entity.UserProjectRoles, messageTemplate='{javax.validation.constraints.NotNull.message}'}
ConstraintViolationImpl{interpolatedMessage='may not be null', propertyPath=roles, rootBeanClass=class clahrc.entity.UserProjectRoles, messageTemplate='{javax.validation.constraints.NotNull.message}'}
]
at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.validate(BeanValidationEventListener.java:159)
at org.hibernate.cfg.beanvalidation.BeanValidationEventListener.onPreInsert(BeanValidationEventListener.java:94)
at org.hibernate.action.internal.EntityInsertAction.preInsert(EntityInsertAction.java:175)
at org.hibernate.action.internal.EntityInsertAction.execute(EntityInsertAction.java:73)
at org.hibernate.engine.spi.ActionQueue.execute(ActionQueue.java:272)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:264)
at org.hibernate.engine.spi.ActionQueue.executeActions(ActionQueue.java:186)
at org.hibernate.event.internal.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:326)
at org.hibernate.event.internal.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:52)
at org.hibernate.internal.SessionImpl.flush(SessionImpl.java:1081)
at org.hibernate.ejb.AbstractEntityManagerImpl.flush(AbstractEntityManagerImpl.java:973)
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.persistence.EntityManagerInvocationHandler.invoke(EntityManagerInvocationHandler.java:46)
at $Proxy77.flush(Unknown Source)
at org.jboss.seam.framework.EntityHome.persist(EntityHome.java:85)
at clahrc.session.UserProjectRolesHome.persist(UserProjectRolesHome.java:104)
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:22)
at org.jboss.seam.intercept.RootInvocationContext.proceed(RootInvocationContext.java:32)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:56)
at org.jboss.seam.transaction.RollbackInterceptor.aroundInvoke(RollbackInterceptor.java:28)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.BijectionInterceptor.aroundInvoke(BijectionInterceptor.java:77)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.transaction.TransactionInterceptor$1.work(TransactionInterceptor.java:97)
at org.jboss.seam.util.Work.workInTransaction(Work.java:61)
at org.jboss.seam.transaction.TransactionInterceptor.aroundInvoke(TransactionInterceptor.java:91)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.core.MethodContextInterceptor.aroundInvoke(MethodContextInterceptor.java:44)
at org.jboss.seam.intercept.SeamInvocationContext.proceed(SeamInvocationContext.java:68)
at org.jboss.seam.intercept.RootInterceptor.invoke(RootInterceptor.java:107)
at org.jboss.seam.intercept.JavaBeanInterceptor.interceptInvocation(JavaBeanInterceptor.java:186)
at org.jboss.seam.intercept.JavaBeanInterceptor.invoke(JavaBeanInterceptor.java:104)
at clahrc.session.UserProjectRolesHome_$$_javassist_seam_21.persist(UserProjectRolesHome_$$_javassist_seam_21.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:597)
at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:335)
at org.jboss.el.util.ReflectionUtil.invokeMethod(ReflectionUtil.java:348)
at org.jboss.el.parser.AstPropertySuffix.invoke(AstPropertySuffix.java:58)
at org.jboss.el.parser.AstValue.invoke(AstValue.java:96)
at org.jboss.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:276)
at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)
at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88)
at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102)
at javax.faces.component.UICommand.broadcast(UICommand.java:315)
at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)
at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)
at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)
at org.jboss.seam.web.LoggingFilter.doFilter(LoggingFilter.java:60)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.IdentityFilter.doFilter(IdentityFilter.java:40)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.MultipartFilter.doFilter(MultipartFilter.java:90)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.ExceptionFilter.doFilter(ExceptionFilter.java:64)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.RedirectFilter.doFilter(RedirectFilter.java:45)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.web.HotDeployFilter.doFilter(HotDeployFilter.java:53)
at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:69)
at org.jboss.seam.servlet.SeamFilter.doFilter(SeamFilter.java:158)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:397)
at org.jboss.as.jpa.interceptor.WebNonTxEmCloserValve.invoke(WebNonTxEmCloserValve.java:50)
at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:153)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:155)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:368)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:671)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:930)
at java.lang.Thread.run(Thread.java:662)