.jar format to MOBI

jojobookreader · 01-06-2012, 04:10 AM

Hi,
I have downloaded some books in .jar format but am unable to do anything with them.
I was hoping to convert them to Mobi files to send to my Kindle but it seems Calibre cannot do anything with them.
Also, even if I just "double-click" them all I get it the error message:

"failed to load Main-Class manifest attribute from ****.jar"

Any suggestions anyone??

regards, jojo

DSpider · 01-06-2012, 06:07 AM

Isn't .jar a Java archive (ie. a mobile phone game or utility) ? Try opening one of them with WinRAR or 7-Zip. If there's something that looks like HTML code you should be able to convert it somehow...

If you can't open any, there may be some form of DRM applied to them, I'm not sure. This format isn't very common. It's probably some relic from the pre-Palm and "PDA" days.

BobC · 01-17-2012, 12:34 PM

.jar is indeed a Java Archive - some books have been packaged up so as to be readable on a mobile phone. The .jar contains effectively the reader and the book.

I would think most books of this sort could be sourced in a "proper" format rather than messing about trying to de-construct the packaging of the .jar.

Gutenberg have a Qioo format that is somewhat similar. I have unzipped a Qioo.jar archive and it contains amongst other things a text file called "data" which is the book in simple text format. As the text contains the usual Gutenberg headers it would be much easier to download the original text !

BobC

jojobookreader · 02-03-2012, 03:08 AM

Thank BobC,
that is very explanatory. think i will look for the proper format in future.

jojo

01-06-2012, 04:10 AM	#1
jojobookreader Junior Member Posts: 2 Karma: 10 Join Date: Jan 2012 Device: kindle	.jar format to MOBI Hi, I have downloaded some books in .jar format but am unable to do anything with them. I was hoping to convert them to Mobi files to send to my Kindle but it seems Calibre cannot do anything with them. Also, even if I just "double-click" them all I get it the error message: "failed to load Main-Class manifest attribute from ****.jar" Any suggestions anyone?? regards, jojo

01-06-2012, 06:07 AM	#2
DSpider Evangelist Posts: 450 Karma: 343115 Join Date: Nov 2009 Location: Romania Device: PW2 2014	Isn't .jar a Java archive (ie. a mobile phone game or utility) ? Try opening one of them with WinRAR or 7-Zip. If there's something that looks like HTML code you should be able to convert it somehow... If you can't open any, there may be some form of DRM applied to them, I'm not sure. This format isn't very common. It's probably some relic from the pre-Palm and "PDA" days. Last edited by DSpider; 01-07-2012 at 02:43 PM.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
MOBI format concern	Ario Khamemi PHD	Amazon Kindle	17	02-10-2011 08:21 AM
best format to convert to mobi	rcuadro	Kindle Formats	15	03-15-2009 08:07 PM
ePub to Mobi Format	greeny	Bookeen	10	02-24-2009 02:54 PM
Kindle format > Mobi?	Halk	Bookeen	4	02-13-2009 11:19 AM
mobi format	sassanik	Sony Reader	7	09-04-2008 01:52 PM

01-17-2012, 12:34 PM	#3
BobC Guru Posts: 691 Karma: 3026110 Join Date: Dec 2008 Location: Lancashire, U.K. Device: BeBook 1, BeBook Pure, Kobo Glo, (and HD),Energy Sistem EReader Pro +	.jar is indeed a Java Archive - some books have been packaged up so as to be readable on a mobile phone. The .jar contains effectively the reader and the book. I would think most books of this sort could be sourced in a "proper" format rather than messing about trying to de-construct the packaging of the .jar. Gutenberg have a Qioo format that is somewhat similar. I have unzipped a Qioo.jar archive and it contains amongst other things a text file called "data" which is the book in simple text format. As the text contains the usual Gutenberg headers it would be much easier to download the original text ! BobC

02-03-2012, 03:08 AM	#4
jojobookreader Junior Member Posts: 2 Karma: 10 Join Date: Jan 2012 Device: kindle	Thank BobC, that is very explanatory. think i will look for the proper format in future. jojo

Advert