Currently I receive an e-mail once an hour with minute resolution data.  I would like to combined the data contained in 24 (or more) e-mails into one large csv file.  Part of the problem is that the body of each e-mail(no attachments) has a header before the data is presented in csv format (See bottom for example).  In the following code you can see that I am trying to split the message string, into a string array that separates the message string at each '\n' AKA carriage return (Credit to Phi.lho for the idea). Next I try and join the strings contained in that string array back together minus the first 8 lines as that is where the header is.

As it completes each edited message they are added to a different string array of all the edited messages.  I then try and join these together with '\n' as the delimiter.  Lastly I am simply trying to print the resulting string so that I can verify the data looks correct before I move to the next step of actually creating a text file.

My problem is that I keep receiving a Java Null pointer error (along with some others) and can't figure out why.  Do strings have a limit to how long they can be?  Maybe I'm not using the join() function properly?  Any help or suggestions would be much appreciated.

Code:

2. import javax.mail.*;
3. import javax.mail.internet.*;
4. import javax.mail.Authenticator;
5. import javax.mail.PasswordAuthentication;
6. 
   
7. String []target;
8. String []parsedMess;
9. String []editedMess;
10. String completeMess;
11. 
    
12. void setup() {
13.   size(200,200);
14.   checkMail();  
15.   System.out.println(completeMess); 
16.   noLoop();
17. }
18. 
    
19. /****************************************************************CHECK MAIL FUNCTION***********************************************************************************/
20. void checkMail() {
21.   try {
22.     Properties props = System.getProperties();
23. 
    
24.     props.put("mail.pop3.host", "pop.gmail.com");
25.     
26.     // These are security settings required for gmail
27.     // May need different code depending on the account
28.     props.put("mail.pop3.port", "995");
29.     props.put("mail.pop3.starttls.enable", "true");
30.     props.setProperty("mail.pop3.socketFactory.fallback", "false");
31.     props.setProperty("mail.pop3.socketFactory.class","javax.net.ssl.SSLSocketFactory");
32. 
    
33.     // Create authentication object
34.     Auth auth = new Auth();
35.     
36.     // Make a session
37.     Session session = Session.getDefaultInstance(props, auth);
38.     Store store = session.getStore("pop3");
39.     store.connect();
40.     
41.     // Get inbox
42.     Folder folder = store.getFolder("INBOX");
43.     folder.open(Folder.READ_ONLY);
44.     System.out.println(folder.getMessageCount() + " total messages.");
45.     
46.     // Get array of messages and display them
47.     Message message[] = folder.getMessages();
48.     for (int i=0; i < message.length; i++) {
49.        int y = 0;
50.        String content = message[i].getContent().toString(); 
51.        String[] emailMess = split(content, '\n' );   //Here the email body is split up into sections seperated by a carriage return
52.        for (int k = 7; k < emailMess.length; k++){  //I start at 7 here to remove the unwanted lines at the top of each e-mail      
53.               parsedMess[y] = emailMess[k];        //Create parsedMess array using email array minus the first 7 lines
54.               y++;
55.         }
56.         editedMess[i] = join(parsedMess,'\n');          //Join my strings back together seperated by a carriage return (as it was originally) to form one large email string
57.     
58.   }
59.   completeMess = join(editedMess, '\n');          //Join all my complete email strings together into one large
60. 
    
61.     // Close the session
62.     folder.close(false);
63.     store.close();
64.   } 
65.   
66.   // This error handling isn't very good
67.   catch (Exception e) {
68.     e.printStackTrace();
69.   }
70. }
71. 
    
72. 
    
73. 
    
74. public class Auth extends Authenticator {
75. 
    
76.   public Auth() {
77.     super();
78.   }
79.   public PasswordAuthentication getPasswordAuthentication() {
80.     String username, password;
81.     username = "mymail@gmail.com";
82.     password = "password";
83.     System.out.println("authenticating. . ");
84.     return new PasswordAuthentication(username, password);
85.   }
86. }
87. 
    
  

 Example E-mail Body: