<f:ajax> JSF 2.0

<h:outputLabel for="somCliente"
                                           value="Cliente"/>
                            <h:selectOneMenu id="somCliente"
                                             value="#{dlgGridCompMB.cliente}">
                                <f:selectItems value="#{dlgGridCompMB.clientes}"/>
                                <f:ajax listener="#{dlgGridCompMB.atualizarClientes}"
                                        execute="@this"
                                        event="change"/>

                            </h:selectOneMenu>

public void atualizarClientes(ValueChangeEvent event) {
        try {
            IEmpresaBO empresaBO = getBusinessFactory().getIEmpresaBO();
            if (getClientes().size() > 0) {
                this.carregarCombos();
                this.carregarTabela();
            }
        } catch (Exception ex) {
            super.getLogger().error(ex.getMessage());
            ex.printStackTrace();
        }
    }

OBS: Já troquei o (ValueChangeEvent  por ActionEvent)

SEVERE: javax.faces.FacesException: /index.xhtml @23,57 listener="#{dlgGridCompMB.atualizarClientes}": Method not found: [email removido](javax.faces.event.AjaxBehaviorEvent)
        at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:90)
        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:312)
        at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1523)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:188)
        at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:641)
        at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:97)
        at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:85)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:185)
        at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:325)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:226)
        at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:165)
        at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:791)
        at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:693)
        at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:954)
        at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:170)
        at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:135)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:102)
        at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:88)
        at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:76)
        at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:53)
        at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:57)
        at com.sun.grizzly.ContextTask.run(ContextTask.java:69)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:330)
        at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:309)
        at java.lang.Thread.run(Thread.java:619)
Caused by: javax.el.MethodNotFoundException: /index.xhtml @23,57 listener="#{dlgGridCompMB.atualizarClientes}": Method not found: [email removido](javax.faces.event.AjaxBehaviorEvent)
        at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:102)
        at com.sun.faces.facelets.tag.jsf.core.AjaxBehaviorListenerImpl.processAjaxBehavior(AjaxHandler.java:439)
        at javax.faces.event.AjaxBehaviorEvent.processListener(AjaxBehaviorEvent.java:113)
        at javax.faces.component.behavior.BehaviorBase.broadcast(BehaviorBase.java:98)
        at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:763)
        at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:775)
        at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267)
        at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82)
        ... 27 more