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JavaMail BaseEncode64 Error

I'm currently developing an application which download attachment from gmail account. Right now, I got error whenever downloading zipped attachment. But, not all, some I can retrieve it without error. Here's the Exception message:

Exception in thread "main" com.sun.mail.util.DecodingException: BASE64Decoder: Error in encoded stream: needed 4 valid base64 characters but only got 1 before EOF, the 10 most recent characters were: "Q3w5ilxj2P"

FYI: I was able to download the attachment via gmail web interface.

Here's the snippet:

        Multipart multipart = (Multipart) message.getContent();

        for (int i = 0; i < multipart.getCount(); i++) {

            BodyPart bodyPart = multipart.getBodyPart(i);

            if (bodyPart.getFileName().toLowerCase().endsWith("zip") ||
                    bodyPart.getFileName().toLowerCase().endsWith("rar")) {
                InputStream is = bodyPart.getInputStream();
                File f = new File("/tmp/" + bodyPart.getFileName());
                FileOutputStream fos = new FileOutputStream(f);
                byte[] buf = new byte[bodyPart.getSize()];
                int bytesRead;
                while ((bytesRead = is.read(buf)) != -1) {
                    fos.write(buf, 0, bytesRead);
                }
                fos.close();
            }
        }
    }

Anyone have idea, how to work around this problem?

like image 794
ariefbayu Avatar asked Nov 18 '09 11:11

ariefbayu


2 Answers

From a list of the known limitations, bugs, issues of JavaMail:

Certain IMAP servers do not implement the IMAP Partial FETCH functionality properly. This problem typically manifests as corrupt email attachments when downloading large messages from the IMAP server. To workaround this server bug, set the "mail.imap.partialfetch" property to false. You'll have to set this property in the Properties object that you provide to your Session.

So you should just turn off partial fetch in imap session. For example:

Properties props = System.getProperties();
props.setProperty("mail.store.protocol", "imap");
props.setProperty("mail.imap.partialfetch", "false");
Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("imaps");
store.connect("imap.gmail.com", "<username>","<password>");

source: https://javaee.github.io/javamail/docs/api/com/sun/mail/imap/package-summary.html

like image 74
RED Avatar answered Nov 04 '22 13:11

RED


If You Are Using java mail API then add these lines while you are connectin the imap server......

Properties prop = new Properties();
prop.put("mail.imaps.partialfetch", false);
Session session = Session.getDefaultInstance(prop, null);

........ .... your code .. ......

it should work.

like image 22
Sorted Avatar answered Nov 04 '22 12:11

Sorted