unable to sign jar: java.util.zip.ZipException: invalid entry compressed size

99% of the time what that means is your jar is already signed

However jarsigner has no way to remove signatures from a jar , but you can do that manually since a jar file is a zip archive all you have to do is extract it , delete the META-INF directory and repack it.

Personally i use muCommander , you have to do this : shift+F6 (rename to .zip) > enter > del META-INF > enter > shift+F6 (rename back)
It treats archives as standard directories so it automatically handles the unpacking and repacking of the archive transparently

If you are a terminal lover you can run this for the same results:

zip -d YourJar.ext “META-INF*”

Which is going to result in this :
deleting: META-INF/MANIFEST.MF
deleting: META-INF/CERT.SF
deleting: META-INF/CERT.RSA

Yahoo recently bought Overture for a shot at the growing PPC market on the heels of recent  acquisitions of AltaVista and Alltheweb/FAST ,
so at this moment the 2 giants in the search engine business are Google and Yahoo , and i am personally glad of the increasing competition presented by yahoo even tho’ my homepage is set to google.com for 6 years now and it won’t change soon

A cause why Yahoo might have dumped Google might lay in the popularity decrease of the search engine giant due to it’s ongoing scandals pertaining Gmail , Pagerank , drugs , google bombing and a lot of other not the least relevant issues

Google Search http://google.com

Firms/technologies bought/integrated into google :
http://www.sprinks.com/index.htm Sprinks
http://www.appliedsemantics.com AppliedSemantics

Search engines that are powered by google :
http://search.aol.com/ AOL Search
http://www.earthlink.net/ Earthlink
http://teoma.com/ Teoma
http://www.iwon.com/ Iwon
http://www.hotbot.com/ Hotbot
http://www.go.com/ GO

Yahoo! Search http://search.yahoo.com

Firms/technologies bought/integrated into yahoo :
http://www.inktomi.com Inktomi
http://www.overture.com Overture

Search engines that are powered by yahoo :
http://www.altavista.com/ AltaVista
http://www.alltheweb.com/ Alltheweb
http://search.msn.com/ MSN Search
http://cnn.com/ CNN
http://excite.com/ Excite
http://www.kanoodle.com/ Kanoodle
http://infospace.com/ Infospace

the bad part with the adfree search is that you do not have a advanced search option

however you can put manually the options in the url like this
http://www.google.com/ie?num=100

the url above for example shows 100 finds per page and to not have to write all the options every time you can make it your homepage like i do

Google in english indiferent of the country you are in
http://www.google.com/ncr

External tools:

Poodle from gritechnologies can help in search engine optimization
http://www.gritechnologies.com/tools/spider.go

This interesting script at http://www.scroogle.org/scraper.html claims to show you how google is broken and what results it fails to show/rate like it should

http://www.mypagerank.net/ can show you the google pagerank for a specific site

http://www.soople.com is also a extension of google , better put , some kind of a gui for some of the google functions i detail below

Special searches :

you enter for example “phonebook:mancini ca” in a google search box and you can access it’s phonebook listing

phonebook:nameaddress shows phonebook entry of person
define:word gives definition of any word
related:url same as “what’s related” on serps.
link:url Shows other pages with links to that url.
site:domain restricts search results to the given domain.
allinurl:url shows only pages with all terms in the url.
inurl: like allinurl, but only for the next query word.
allintitle: shows only results with terms in title.
intitle: similar to allintitle, but only for the next word. “intitle:webmaster google” finds only pages with webmaster in the title, and google anywhere on the page.
cache:url will show the Google version of the passed url.
info:url will show a page containing links to related searches, backlinks, and pages containing the url. This is the same as typing the url into the search box.
spell: will spell check your query and search for it.
stocks: will lookup the search query in a stock index.
filetype: will restrict searches to that filetype. “-filetype:doc” to remove Microsoft word files.
daterange: is supported in Julian date format only. 2452384 is an example of a Julian date.
maps: If you enter a street address, a link to Yahoo Maps and to MapBlast will be presented.
phone: enter anything that looks like a phone number to have a name and address displayed. Same is true for something that looks like an address (include a name and zip code)
site:www.somesite.net “+www.somesite.+net” (tells you how many pages of your site are indexed by google)
allintext: searches only within text of pages, but not in the links or page title
allinanchor: searches only within links, not text or title