Exceção java.lang.NullPointerException ao carregar GlassFish 2.1

Minha aplicação estava carregando normalmente no GlassFish 2.1 (JSF) e agora está dando essa exceção, o que pode ser isso?
HTTP Status 503 -

WebModule[/Transys]PWC1275: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener java.lang.NullPointerException at com.sun.faces.config.JSFVersionTracker.publishInstanceToApplication(JSFVersionTracker.java:264) at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:408) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4632) at org.apache.catalina.core.StandardContext.start(StandardContext.java:5312) at com.sun.enterprise.web.WebModule.start(WebModule.java:353) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:989) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:973) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:704) at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1627) at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1232) at com.sun.enterprise.server.WebModuleDeployEventListener.moduleDeployed(WebModuleDeployEventListener.java:182) at com.sun.enterprise.server.WebModuleDeployEventListener.moduleDeployed(WebModuleDeployEventListener.java:278) at com.sun.enterprise.admin.event.AdminEventMulticaster.invokeModuleDeployEventListener(AdminEventMulticaster.java:1005) at com.sun.enterprise.admin.event.AdminEventMulticaster.handleModuleDeployEvent(AdminEventMulticaster.java:992) at com.sun.enterprise.admin.event.AdminEventMulticaster.processEvent(AdminEventMulticaster.java:470) at com.sun.enterprise.admin.event.AdminEventMulticaster.multicastEvent(AdminEventMulticaster.java:182) at com.sun.enterprise.admin.server.core.DeploymentNotificationHelper.multicastEvent(DeploymentNotificationHelper.java:308) at com.sun.enterprise.deployment.phasing.DeploymentServiceUtils.multicastEvent(DeploymentServiceUtils.java:231) at com.sun.enterprise.deployment.phasing.ServerDeploymentTarget.sendStartEvent(ServerDeploymentTarget.java:298) at com.sun.enterprise.deployment.phasing.ApplicationStartPhase.runPhase(ApplicationStartPhase.java:132) at com.sun.enterprise.deployment.phasing.DeploymentPhase.executePhase(DeploymentPhase.java:108) at com.sun.enterprise.deployment.phasing.PEDeploymentService.executePhases(PEDeploymentService.java:966) at com.sun.enterprise.deployment.phasing.PEDeploymentService.start(PEDeploymentService.java:609) at com.sun.enterprise.deployment.phasing.PEDeploymentService.start(PEDeploymentService.java:653) at com.sun.enterprise.admin.mbeans.ApplicationsConfigMBean.start(ApplicationsConfigMBean.java:773) 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 com.sun.enterprise.admin.MBeanHelper.invokeOperationInBean(MBeanHelper.java:381) at com.sun.enterprise.admin.MBeanHelper.invokeOperationInBean(MBeanHelper.java:364) at com.sun.enterprise.admin.config.BaseConfigMBean.invoke(BaseConfigMBean.java:477) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:761) at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at com.sun.enterprise.admin.util.proxy.ProxyClass.invoke(ProxyClass.java:90) at $Proxy1.invoke(Unknown Source) at com.sun.enterprise.admin.server.core.jmx.SunoneInterceptor.invoke(SunoneInterceptor.java:304) at com.sun.enterprise.interceptor.DynamicInterceptor.invoke(DynamicInterceptor.java:174) at com.sun.enterprise.admin.jmx.remote.server.callers.InvokeCaller.call(InvokeCaller.java:69) at com.sun.enterprise.admin.jmx.remote.server.MBeanServerRequestHandler.handle(MBeanServerRequestHandler.java:155) at com.sun.enterprise.admin.jmx.remote.server.servlet.RemoteJmxConnectorServlet.processRequest(RemoteJmxConnectorServlet.java:122) at com.sun.enterprise.admin.jmx.remote.server.servlet.RemoteJmxConnectorServlet.doPost(RemoteJmxConnectorServlet.java:193) at javax.servlet.http.HttpServlet.service(HttpServlet.java:754) at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:333) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:196) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:313) at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94) at com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648) at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593) at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587) at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096) at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579) at com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263) at com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214) at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265) at com.sun.enterprise.web.connector.grizzly.WorkerThreadImpl.run(WorkerThreadImpl.java:116) PWC1306: Startup of context /Transys failed due to previous errors
Devo ter feito algo de errado, mas não sei o que foi, estou desenvolvendo um novo módulo que é um cadastro de Tarifas de Cálculo de Frete.

Bom, esse é o MB que tou mexendo:

public class TarifaBean implements java.io.Serializable {

    private TarifaDAO dao;
    private List<Tarifa> lista;
    private Set<Integer> keys;
    private Tarifa item;

    public TarifaBean() {
        dao = new TarifaDAO();
        item = new Tarifa();
    }

    public List<Tarifa> getLista() {
        dao = new TarifaDAO();
        dao.load();
        lista = dao.listaTarifas();
        keys = dao.getKeys();
        return lista;
    }

    public void setLista(List<Tarifa> lista) {
        this.lista = lista;
    }

    public Set<Integer> getKeys() {
        return keys;
    }

    public void setKeys(Set<Integer> keys) {
        this.keys = keys;
    }

    public Tarifa getItem() {
        return item;
    }

    public void setItem(Tarifa item) {
        this.item = item;
    }
    /*
    public List<SelectItem> getListaTarifas() {
        dao.load();
        List<SelectItem> l = new ArrayList<SelectItem>();
        Iterator<Tarifa> it = (Iterator<Tarifa>) this.getLista();
        while (it.hasNext()) {
            Tarifa obj = it.next();
            l.add(new SelectItem(obj.getId(), obj.getNome()));
        }
        return l;
    }*/
}

Esse é o DAO:

public class TarifaDAO extends GenericDAO {

    FacesContext facesContext;
    private static Map<Integer, Tarifa> map;

    public TarifaDAO() {
        super(Tarifa.class);
        facesContext = FacesContext.getCurrentInstance();
    }

    public void load() {
        map = new LinkedHashMap<Integer, Tarifa>();
        List<Tarifa> lista = listaTarifas();
        for (Tarifa item : lista) {
            map.put(item.getId(), item);
        }
    }

    public List<Tarifa> listaTarifas() {
        session = HibernateUtil.getSessionFactory().getCurrentSession();
        List<Tarifa> lista = null;
        lista = session.createCriteria(Tarifa.class).addOrder(Order.asc("nome")).list();
        return lista;
    }

    public Set<Integer> getKeys() {
        return map.keySet();
    }

    // Actions ------------------------------------------------------------------------------------
    public Tarifa find(Integer key) {
        if (map == null) {
            this.load();
        }
        return map.get(key);
    }
}

faces-config.xml:

<managed-bean>
        <managed-bean-name>tarifaBean</managed-bean-name>
        <managed-bean-class>org.trans.bean.TarifaBean</managed-bean-class>
        <managed-bean-scope>request</managed-bean-scope>
    </managed-bean>

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