inputFileUpload error

I created FileUploadForm.java as a managed bean in my application which
I call
from my upload form copied from UploadForm.jsp - when I click the
'upload' button I get this error:

java.lang.NullPointerException at
com.odabasioglu.master.backbean.FileUploadForm.processMyFile

UploadForm.jsp******************
<h:form id="MyForm" enctype="multipart/form-data">
<x:inputFileUpload id="fileUpload" value="#{FileUploadForm.myFile}"
storage="file" required="true"/>
<h:commandButton value="Submit"
action="#{FileUploadForm.processMyFile}"/>
</h:form>

FileUploadForm.java***************
  private UploadedFile myFile;
    private String myParam;
    private String myResult;

    public UploadedFile getMyFile() {
        return myFile;
    }

    public void setMyFile(UploadedFile myFile) {
        this.myFile = myFile;
    }
    public String processMyFile() {

         InputStream in = new
BufferedInputStream(file.getInputStream());
    }
web.xml****************
 <filter>
        <filter-name>ExtensionsFilter</filter-name>
        <filter-class>
            org.apache.myfaces.component.html.util.ExtensionsFilter
        </filter-class>
        <init-param>
            <param-name>uploadMaxFileSize</param-name>
            <param-value>10m</param-value>
        </init-param>
        <init-param>
            <param-name>uploadThresholdSize</param-name>
            <param-value>100k</param-value>
        </init-param>
    </filter>

    <filter-mapping>
        <filter-name>ExtensionsFilter</filter-name>
        <servlet-name>FacesServlet</servlet-name>
    </filter-mapping>