Null Pointer Exception

[Former Member]

Hi Experts

I am getting the Null Pointer Exception when I execute the following code. Can anybody please suggest where i am going wrong.

  public void readInbox( )
  {
    //@@begin readInbox()
	while (! wdContext.nodeEmail().isEmpty()) { 
		wdContext.nodeEmail().removeElement(wdContext.nodeEmail().getElementAt(0) );
	}
	wdContext.nodeEmail().invalidate();    
	Message[] message = new Message[1000];
	IPublicEmailInteractiveFormComp.IEmailElement newEmailNodeElement;
	//Set properties
	
	// @TODO Enter your email server address here by replacing the text in angle brackets.
	String host = "otemail.otegroup.com";
	// @TODO Enter your email account here by replacing the text in angle brackets.
	String username = "abc@otegroup.com";
	// @TODO Enter your email account password here by replacing the text in angle brackets.
	String password = "password";
	Properties props = new Properties();	
	props.put("mail.smtp.host", host);
	//Set Session
	Session session = Session.getInstance(props, null);
	//Set the store
	try {
		Store store = session.getStore("imap");
		store.connect(host,username,password);
		//Get folder
		Folder folder = store.getFolder("INBOX");
		folder.open(Folder.READ_ONLY);
		//Get Mails
		message = folder.getMessages();
		//Fill table with mails
		for (int i = 0; i < message.length; i++) 
		{
			if (message<i>.isSet(Flags.Flag.SEEN) == false) 
			{ 
				if (message<i>.getSubject().equals("Travel Request Form"))
				{
					newEmailNodeElement = wdContext.createEmailElement();	  		
					newEmailNodeElement.setFrom(message<i>.getFrom()[0].toString());
					newEmailNodeElement.setSubject(message<i>.getSubject());
					newEmailNodeElement.setSentDate(message<i>.getSentDate().toString());
					//Check for right Attachment
					Object content = message<i>.getContent();
					if ( content != null  && content instanceof Multipart) 
					{
						for (int j = 0 , n = ((Multipart)content).getCount(); j < n; j++) 
						{		
							Part part = ((Multipart)content).getBodyPart(j);
							String disposition = part.getDisposition();
							if ( disposition != null && (disposition.equals(Part.ATTACHMENT) || disposition.equals(Part.INLINE)))
							{
								if (part.getFileName().equals("TravelRequest.pdf")) 
								{
									newEmailNodeElement.setAttachment(true);
									newEmailNodeElement.setContentType(part.getContentType().toString());
									InputStream is = part.getInputStream();
									ByteArrayOutputStream bo = new ByteArrayOutputStream();																
									int c;
									while ((c = is.read()) > -1) bo.write(c);
									byte[] pdfSource = bo.toByteArray();
									newEmailNodeElement.setPdfSource(pdfSource);
									break;	
								}
								else
								{
									newEmailNodeElement.setAttachment(false);	
								}
							}
						}
					}
					wdContext.nodeEmail().addElement(newEmailNodeElement);
				}
			}
		}
		//Close connection
		folder.close(true);
		store.close();		
	} 
	catch (MessagingException e) 
	{
		wdComponentAPI.getMessageManager().reportSuccess(e.getMessage());
		e.printStackTrace();
	} 
	catch (IOException e)
	{
		wdComponentAPI.getMessageManager().reportSuccess(e.getMessage());
		e.printStackTrace();
	} 	
	catch (NullPointerException e)
	{
		wdComponentAPI.getMessageManager().reportSuccess(e.getMessage());
		e.printStackTrace();
	}
    //@@end
  }

regards

Abdullah

[Former Member · Accepted solution]

Abdullah,

There are several reasons:

First problem is the following fragment:

//Get Mails
message = folder.getMessages();
//Fill table with mails
for (int i = 0; i < message.length; i++)  {
...
}

Looks like folder.getMessages() returns null value. So rewrite condition in your loop as:

for (int i = 0; null != message && i < message.length; i++)  {
...
}

Second, what if some mails has no subject? Rewrite the following in null-defensive style:

if (message[ i ].getSubject().equals("Travel Request Form")) {
  newEmailNodeElement = wdContext.createEmailElement();
  newEmailNodeElement.setFrom(message[ i ].getFrom()[0].toString());
  newEmailNodeElement.setSubject(message[ i ].getSubject());
  newEmailNodeElement.setSentDate(message[ i ].getSentDate().toString());
  ...
}

Should be:

if ("Travel Request Form".equals( message[ i ].getSubject() ) ) {
  newEmailNodeElement = wdContext.createEmailElement();
  if ( message[ i ].getFrom() != null && message[ i ].getFrom().length > 0)
    newEmailNodeElement.setFrom(message[ i ].getFrom()[0].toString());
  newEmailNodeElement.setSubject(message[ i ].getSubject());
  if (message[ i ].getSentDate() != null)
    newEmailNodeElement.setSentDate(message[ i ].getSentDate().toString());
  ...
}

Same below:

if (part.getFileName().equals("TravelRequest.pdf")) {
...
}

Must be changed to:

if (  "TravelRequest.pdf".equals(part.getFileName())  ) {
...
}

Valery Silaev

SaM Solutions

http://www.sam-solutions.net

[Former Member · Accepted solution]

Hi Valery,

thanks once again for helping me out.

I am able to get the pdfs into the table in my application.

When I click on any of the rows. A new opens up that displays the pdf content.

When I click on submit button on this view; My explorer closes. This happens when I have a pdf and i trigger an outbound plug.

Any hints as to why this problem occurs.

Regards

Abdullah

[Former Member · Accepted solution]

Abdullah,

Please post this question as separate thread (it's common SDN policy -- one question - one thread).

VS

[Former Member]

Hi Abdulla,

I think u r getting exception because of not initializing array elements after

Message[] message = new Message[1000];

Add the following after this and try

for(int i=0;i<1000;i++)

{

message<i>=new MimeMessage(sessionObj);

}

Regards

Fahad Hamsa