Struts检测到未处理的异常：java.lang.NullPointerException

嗨，我有这个问题，我的代码，我试图上传文件到服务器上，并保持数据库

第一个版本是相同的代码，没有文件上传，所有的工作都很好

struts.xml

1048576
image/png，image/gif，image/jpg，image/jpeg
/paginaBienvenida.jsp
/nuevoclient.jsp

现在，在AcconadIrclient上执行

public String execute() throws Exception {
    String filePath = "C:\\Users\\alumno\\Desktop\\DWES_JAVA\\imagenes";
    //crea un fichero
    File fileToCreate = new File(filePath, this.fileFileName);
    String rutaCompleta=filePath+ this.fileFileName;
    //volcado de datos.
    FileUtils.copyFile(this.file, fileToCreate);


    Cliente cliente = new Cliente();
    System.out.println(getNombre());

    cliente.setNombre(getNombre()); 
    cliente.setEdad(getEdad());
    cliente.setEmail(getEmail());
    cliente.setTelefono(getTelefono()); 
    cliente.setRuta(rutaCompleta);

    InterfaceClienteDAO clienteDAO = FactoriaDAO.getAlumnoDAO("MySQL");

    clienteDAO.insertarCliente(cliente);    

    return SUCCESS;

}

豆客

private String nombre;
private String email;
private String telefono;
private int edad;
private String ruta;

以及能手和二传手

客户岛

public void insertarCliente(Cliente c){

    try {
        db.abrirConexion();
        String query = "insert into cliente values('" + c.getNombre() + "','"
                + c.getEmail() + "','" + c.getTelefono() + "',"
                + c.getEdad() + ","+c.getRuta()+" )";
        db.ejecutarUpdate(query);
        db.commit();
        db.cerrarConexion();

    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
}

jsp仅包含信息

现在是例外

Struts Problem Report

Struts has detected an unhandled exception:

Messages:   
Stacktraces

java.lang.NullPointerException
    java.io.File.(Unknown Source)
    actions.AccionAnadirCliente.execute(AccionAnadirCliente.java:38)
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    java.lang.reflect.Method.invoke(Unknown Source)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:450)
    com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:289)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:252)
    org.apache.struts2.interceptor.FileUploadInterceptor.intercept(FileUploadInterceptor.java:325)
    com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:246)
    org.apache.struts2.impl.StrutsActionProxy.execute(StrutsActionProxy.java:54)
    org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:562)
    org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)
    org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)
    org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
    org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1023)
    org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
    org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    java.lang.Thread.run(Unknown Source)

谢谢，伊万

编辑： 例外情况是这样的

File fileToCreate = new File(filePath, this.fileFileName);

---

您只包括文件上载拦截器，而需要包括整个堆栈（默认堆栈或您创建的自定义堆栈）：

1048576
image/png，image/gif，image/jpg，image/jpeg
/paginaBienvenida.jsp
/nuevoclient.jsp

您的第一个参数中也有一个输入错误，它是

maximum

而不是

maximun