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I would bet on ECLIPSE<br />
go to <a href="http://www.eclipse.org" rel="ugc">www.eclipse.org</a>&nbsp; and see how huge their collection of tools is.<br />
ECLIPSE is fast, smart and reliable, even if you fooled around with its files.<br />
Last: as you don't install it, but just put it somewhere, minimal interference with the O.S.<br />
;JOOP!
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I would bet on ECLIPSE
go to www.eclipse.org [http://www.eclipse.org]  and see how huge their collection of tools is.
ECLIPSE is fast, smart and reliable, even if you fooled around with its files.
Last: as you don't install it, but just put it somewhere, minimal interference with the O.S.
;JOOP!

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Since you have an Oracle Background, I would also want to suggest that if you are looking to use components like Oracle ADF (<a href="http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.oracle.com%2Ftechnology%2Fproducts%2Fjdev%2Fhtdocs%2Fpartners%2Faddins%2Fexchange%2Fjsf%2Findex.html&ei=nG5YRbfPMIiusAL39OGJBg&usg=__5sfcVuwgOfZjUj-wjRJdCSt2VuU=&sig2=7dAfCblSu2ywmb8X2CLo2g" rel="ugc">http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.oracle.com%2Ftechnology%2Fproducts%2Fjdev%2Fhtdocs%2Fpartners%2Faddins%2Fexchange%2Fjsf%2Findex.html&ei=nG5YRbfPMIiusAL39OGJBg&usg=__5sfcVuwgOfZjUj-wjRJdCSt2VuU=&sig2=7dAfCblSu2ywmb8X2CLo2g</a>) JSF etc (which Oracle seems to back heavily) JDeveloper is better.<br />
<br />
JDeveloper has excellent support for a ADF which is Oracles own App Dev Fwk, I would suggest Jdeveloper *if and only if* you are going to use ADF inside out.<br />
<br />
For all other *sane* purposes ;) eclipse should do just fine 
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Since you have an Oracle Background, I would also want to suggest that if you are looking to use components like Oracle ADF (http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.oracle.com%2Ftechnology%2Fproducts%2Fjdev%2Fhtdocs%2Fpartners%2Faddins%2Fexchange%2Fjsf%2Findex.html&ei=nG5YRbfPMIiusAL39OGJBg&usg=__5sfcVuwgOfZjUj-wjRJdCSt2VuU=&sig2=7dAfCblSu2ywmb8X2CLo2g [http://www.google.com/url?sa=t&ct=res&cd=1&url=http%3A%2F%2Fwww.oracle.com%2Ftechnology%2Fproducts%2Fjdev%2Fhtdocs%2Fpartners%2Faddins%2Fexchange%2Fjsf%2Findex.html&ei=nG5YRbfPMIiusAL39OGJBg&usg=__5sfcVuwgOfZjUj-wjRJdCSt2VuU=&sig2=7dAfCblSu2ywmb8X2CLo2g]) JSF etc (which Oracle seems to back heavily) JDeveloper is better.

JDeveloper has excellent support for a ADF which is Oracles own App Dev Fwk, I would suggest Jdeveloper *if and only if* you are going to use ADF inside out.

For all other *sane* purposes ;) eclipse should do just fine

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I have an oracle background. <br />
1. Which is the most widely used Java IDE<br />
2. Which is the most upcomming Java IDE<br />
Oracle JDeveloper, Borelands JBuilder, Eclipse
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I have an oracle background. 
1. Which is the most widely used Java IDE
2. Which is the most upcomming Java IDE
Oracle JDeveloper, Borelands JBuilder, Eclipse

Comparison of Java IDEs

Development in most programming languages is frequently done with an editor or integrated development environment (IDE). An IDE is a software application that provide comprehensive facilities to computer programmers for software development. An IDE normally consists of a source code editor, build automation tools and a debugger. XCode, Visual Studio, Adobe Dreamweaver and Eclipse are some of the more popular development tools, but an editor or IDE can be anything from simple text editors to sophisticated programs. Related topics: All programming and development language, database and web based content management systems topics

Editors IDEs

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.