Re: inputFileUpload error

From:

Lew <lew@nowhere.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 10 Dec 2006 09:39:35 -0500

Message-ID:

<LKednUx_TqK1geHYnZ2dnUVZ_o2vnZ2d@comcast.com>

canodabasioglu@gmail.com wrote:

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

In general, take a look at the line or method identified in the exception, and
see what possibly *could* be null, debug to find out if it actually is null at
the point of invocation, and suss out why it was never set non-null.

How many variables are there at the point identified? Which ones could be null?

FileUploadForm.java***************

Slightly incomplete example.

  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());
    }

Where is the variable 'file' declared?
Where is it (supposed to be) set to a non-null value?

- Lew