Ao enviar um arquivo, recebo o seguinte erro:

Struts Problem Report Struts has detected an unhandled exception: Messages: File: java/io/File.java Line number: 317 
Stacktraces java.lang.NullPointerException java.io.File.(File.java:317) 
    example.uploadFile.execute(uploadFile.java:36) 
    sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 
    sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.jav‌​a:43)
    java.lang.reflect.Method.invoke(Method.java:483)

index.jsp

<form action="upload" method="post" enctype="multipart/form-data">
    <label for="myFile">Upload your file</label>
    <input type="file" name="myFile" />
    <input type="submit" value="Upload"/>
</form>

uploadFile.java

package example;
import java.io.File;
import org.apache.commons.io.FileUtils;
import java.io.IOException;    
import com.opensymphony.xwork2.ActionSupport;

public class uploadFile extends ActionSupport {
   private File myFile;
   private String myFileContentType;
   private String myFileFileName;
   private String destPath;

   public String execute() {

      destPath = "C:\\Program Files\\Apache Software Foundation\\Apache Tomcat 8.0.3\\work";

      try{
         System.out.println("Src File name: " + myFile);
         System.out.println("Dst File name: " + myFileFileName);                     
         File destFile  = new File(destPath, myFileFileName);
         FileUtils.copyFile(myFile, destFile);      
      }catch(IOException e){
         return ERROR;
      }

      return SUCCESS;
   }

   public File getMyFile() {
      return myFile;`
   }
   public void setMyFile(File myFile) {
      this.myFile = myFile; this the file which user selects to upload
   }
   public String getMyFileContentType() {
      return myFileContentType; content type of the uploading file
   }
   public void setMyFileContentType(String myFileContentType) {
      this.myFileContentType = myFileContentType;`
   }
   public String getMyFileFileName() {
      return myFileFileName;
   }
   public void setMyFileFileName(String myFileFileName) {
      this.myFileFileName = myFileFileName; 
   }
}

struts.xml

<struts>
    <include file="example.xml"/>
    <constant name="struts.devMode" value="true" />
    <constant name="struts.multipart.maxSize" value="1000000" />

    <!-- Configuration for the default package. -->
    <package name="default" extends="struts-default">
       <action name="upload" class="example.uploadFile">
            <interceptor-ref name="basicStack"/>
            <interceptor-ref name="fileUpload">
                <param name="allowedTypes">image/jpeg,image/gif</param>
            </interceptor-ref>
            <result name="success">/success.jsp</result>
            <result name="error">/error.jsp</result>
        </action>
    </package>
</struts>