Solved

javamail imap message content encoding

Posted on 2009-07-10
10
1,943 Views
Last Modified: 2013-11-29
I'm trying to download mail from an imap server and I keep getting Unknown Encoding exceptions.  Here's the exception:

java.io.IOException: Unknown encoding: 7Bit;
      javax.mail.internet.MimePartDataSource.getInputStream(MimePartDataSource.java:108)
      com.sun.mail.handlers.text_plain.getContent(text_plain.java:90)
      javax.activation.DataSourceDataContentHandler.getContent(Unknown Source)
      javax.activation.DataHandler.getContent(Unknown Source)
      javax.mail.internet.MimeMessage.getContent(MimeMessage.java:1395)
      net.mainsequence.email.MailMessage.loadMessage(MailMessage.java:176)
      net.mainsequence.email.MailMessage.<init>(MailMessage.java:110)

Any ideas on how to fix this?
Object content = message.getContent();
			if(content instanceof String){
				mailContent = (String) content;
				textSegment = mailContent;
				htmlSegment = "";
			}else if(content instanceof InputStream){
				InputStream in = (InputStream) content;
				byte[] c = new byte[in.available()];
				in.read(c);
				String temp = new String(c);
				mailContent = temp;
				textSegment = mailContent;
				htmlSegment = "";
			}else if(content instanceof Multipart){
				Multipart multipart = (Multipart) message.getContent();	
				getMultiPart(multipart);
			}

Open in new window

0
Comment
Question by:csalem01
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 5
  • 3
  • 2
10 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 24828082
Looks like you might have a malformed header with a stray or extra semicolon. You might need to catch the exception and extract the message to deal with it
0
 
LVL 92

Expert Comment

by:objects
ID: 24828291
encoding should be 7bit
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24829538
Encoding is not case sensitive
0
Salesforce Has Never Been Easier

Improve and reinforce salesforce training & adoption using WalkMe's digital adoption platform. Start saving on costly employee training by creating fast intuitive Walk-Thrus for Salesforce. Claim your Free Account Now

 

Author Comment

by:csalem01
ID: 24839973
i caught the exception and printed the message to a file using the messages getrawinputstream function and it seems like all the messages that I'm having a problem with were caught as spam by spamassassin.  I don't see any problem with the headers though.  Looking through the error log though I see there's also an exception thrown for a message with content type "utf-8" and one message with content type "iso-8859-10".  I attached one of the messages that was throwing the exception with "7Bit", any ideas with what the problem with that message is?
269094365369276.txt
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24840241
The problem is exactly what i told you above. I've just saved some of my mails+headers to file 'ct' and run the following (note the absence of semicolons):
goose@seegobin:/tmp$ grep 'Content-Transfer-Encoding' ct
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: 7bit
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: 7bit
Content-Transfer-Encoding: 7bit
  h=Received:X-YMail-OSG:Message-ID:Date:From:User-Agent:MIME-Version:To:Subject:Content-Type:Content-Transfer-Encoding;
Content-Transfer-Encoding: 7bit
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: 7bit
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: base64
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: quoted-printable
Content-Transfer-Encoding: base64
goose@seegobin:/tmp$ 

Open in new window

0
 
LVL 92

Expert Comment

by:objects
ID: 24844760
transfer encoding is incorrect as I pointed out above :)
It should be "7bit", not "7bit;"
0
 

Author Comment

by:csalem01
ID: 24852524
Thanks alot, that worked.  I attached the code that made it work.  

I'm also getting errors with these content types (I attached the messages for each):

Content-Type: text/plain;
 charset="iso-8859-10"

Content-Type: text/plain; charset=koi8-r
Content-Transfer-Encoding: utf-8

Any ideas on how to fix these?
String xEncoding[] = message.getHeader("Content-Transfer-Encoding");
			if(xEncoding != null){
				if(xEncoding.length > 0){
					if(xEncoding[0].equalsIgnoreCase("7Bit;")){
						tempMessage = new MimeMessage((MimeMessage)message);
						tempMessage.removeHeader("Content-Transfer-Encoding");
						tempMessage.addHeader("Content-Transfer-Encoding", "7Bit");
					}
				}
			}

Open in new window

980348665832080.txt
318235670833124.txt
0
 
LVL 86

Accepted Solution

by:
CEHJ earned 500 total points
ID: 24852717
Those charsets are relatively exotic. I certainly don't have support for ISO-8859-10 in my runtime, but do have support for KOI8-R in one runtime. Make sure you've selected full internationalization support on install.

You could probably ignore the mails that are either wrong or unsupported
0
 

Author Comment

by:csalem01
ID: 24853803
The problem with the KOI8-R mail is the "Content-Transfer-Encoding: utf-8".

"utf-8" isn't in the mime spec.  I guess I'll just have to ignore those mails.

thanks alot for your help
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 24853864
:-)
0

Featured Post

Optimize your web performance

What's in the eBook?
- Full list of reasons for poor performance
- Ultimate measures to speed things up
- Primary web monitoring types
- KPIs you should be monitoring in order to increase your ROI

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Go is an acronym of golang, is a programming language developed Google in 2007. Go is a new language that is mostly in the C family, with significant input from Pascal/Modula/Oberon family. Hence Go arisen as low-level language with fast compilation…
Pop culture is prime bait for hackers seeking to infect user’s computers and mobile devices with malicious malware. Hackers know exactly what the latest trends are online and know how to use them to their advantage.
Video by: Michael
Viewers learn about how to reduce the potential repetitiveness of coding in main by developing methods to perform specific tasks for their program. Additionally, objects are introduced for the purpose of learning how to call methods in Java. Define …
Viewers will learn about the regular for loop in Java and how to use it. Definition: Break the for loop down into 3 parts: Syntax when using for loops: Example using a for loop:
Suggested Courses

630 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question