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Where to find design patterns, best practices for Eclipse plugin development

Our team is developing a Eclipse based IDE (typically a plugins), currently we are progressing good but I feel somehow we are feeling smell of bad practices in code. Example I can give here is, eventListeners :
Consider we have button named button1 and in the same java file (just below the button) we are adding selection listener to it like:
button1.addSelectionListener(new SelectionListener() {
//Remaining code here
}
Which I feel is completly bad idea, and my question, is there any design pattern, best practices etc available for eclipse plugin development? Or do you have any small tips/suggestions for the same? I know there are books available like Code Complete 2 etc etc, but I need bit suggestions respect to eclipse plugin development.
I tried in Google and didn't get much good informations regarding same, I got this IBM's article. But I feel it's not very useful, any suggestions or tip is appreciated.
Note: Please let me know if it is not appropriate here or is it good for anyother stackexchange networks (like programmers), I can move it there.

After several years of plugin development, I find these resources to be most useful for me when I find myself struggling on how to implement new feature:
Eclipse sources. Nothing will beat this. Try to find some already existing analogic part of what you're just doing and look how Eclipse developers did it - what patterns and extensions they used and so on. Helps to keep you plugins consistent with other parts of Eclipse. Eclipse Plugin Spy is your friend here (Alt + Shift + F1/F2).
Platform Plug-in Developer Guide - will guide you through basic concepts of Eclipse, like how to create menus properly, implement an editor, or save user preferences.
Eclipse Plug-ins (4th Edition) - Well known must-have for plugins developer.
And, of course, Stack overflow :)

I like to add some more resources that I have found useful to dreo's answer. The eclipse sources are invaluable, if you want to understand something in detail. To understand global concepts however, I suggest to read as much tutorials as you can. I can recommend the following websites:
Eclipse Corner Articles Has a lot of tutorials ranging from basic concepts to plugins specific topics.
Vogella Eclipse Tutorials Also a good tutorial website. It deals with a lot of topics that are important for Eclipse RCP development.
SWT Snippets More than 100 code snippets. Really useful, if you want to learn more about SWT and its capabilities.
The Official Eclipse FAQs Last but not least, I can recommend the official Eclipse FAQs. They provide compact solutions for a variety of topics.

UML Plugin for Eclipse - Class Diagrams & Java Code Generation - Indigo/Juno

I am looking for a UML plugin for Eclipse. I know this questions has been asked several times, but most of them are a few years old. From what I read I would say that most people prefer eUML2, but this officially supports only Helios.
So far I am using argoUML, but the absence of an undo-button is really an usability nightmare, to say the least. Additionally I would prefer integration into Eclipse.
What I want is:
Free/Open-source
Actively developed tool (support for Indigo, planned support for Juno)
Hassle-free installation in Eclipse
Class diagrams
Generate Java code from diagrams
Update the class diagrams after implementation is done (round-trip)
What would be nice:
Other diagrams, where for me the most important are sequence and use case diagrams
If there are in fact no suitable Eclipse plugins, than I would be happy if you could point out other tools that are free/open source and linux-based and which workflow you are using to accomplish the aforementioned requirements.

I'll definitely go with ObjectAid.
It supports drag and drop of classes and packages directly from your code in eclipse.
No need to open another application for your modeling.
Model files (*.ucls) can be kept in a separate project in eclipse while you code/develop your Java codes in another project. All these can be done on a single eclipse session.
Just want to emphasize on the drag-n-drop. I simply love it!
I'm using Eclipse Juno.
I tried other modeling tools but didn't get what I wanted.
P.S.
Creation of class diagrams is free, but needs an evaluation license for creating Sequence diagrams.

For now I will go with either Green UML or UML Lab. Green UML fulfills all the points I asked for, except that I'm not a hundred percent sure it is very actively developed. But the last update is from November 2011. It only supports class diagrams, but that is ok for me. It can be found here.
Other than that I will try the academic version of UML Lab as it looks a bit more promising, though not being free is a draw back.

Papyrus is probably the best choice. It is actively developed and is an industry backed project. It does not have code-generation capabilities by since the uml model is stored as an emf model you can use acceleo for code generation.
Round trip (update of diagram after code update) is also not supported.
But it does support many other UML diagrams.
I tried a number of open source tools, and actually found none that are good to use inside eclipse, so I am using Visual Paradigm for UML, community edition. Not free, does not do what you want, but for modeling purposes it is way above any eclipse plug-in.

The best is Omondo EclipseUML for Java code generation because I can model but also hand code. I never loose my model because multiple iterations are possible opposite to other tools just working from model to code.
Accelero code generation is too complex and the code is not really good. It requires to fix it manually once generated. If more than one package then relations between packages are not generated. I would say that accelero is good for a single class diagram code generation but as soon as you have more than one diagram in a package or multiple package then it is better not to use this plugin.

I was looking for UML Round Trip Engineering tool that supports reversing and drawing sequence Diagrams. Focus is on sequence diagrams as majority of tools can help with class diagrams, but not sequence diags.
Among the Free or cheap tools: I tried Papyrus, Modisco, Modelio, ObjectAid - first 3 are bit over complicated for some basic reversing, tend to ask too many question to locate source and libraries and all is bit clumsy, and they don't help much with sequence diagrams. ObjectAid works well even with the most recent eclipse (Luna). Sequence diagrams have cheap license. Sadly - none of them understands Spring annotations (e.g. #autowire).
Among big and expensive tools like EA, Sparx, Magic Draw, UML Lab (Yatta) - I like none, I find them too expensive for what they offer. Also, Complicated to reverse code (endless search source path problems). Magic and Modelio can't reverse and auto-generate sequence diagrams.
Alternative to these expensive tools is Altova UModel, it works as independent tool or eclipse plugin (I used it independently of eclipse, faster install, offers sync diagram with code function). It's the only tool that can open eclipse project extensions (doesn't ask about classpaths, however can't find maven libraries) and no support for Spring annotations. Java 7 is not officially supported but it works (minor exceptions with some rare generics). If they add: full java 7 support, spring support, open whole eclipse workspace and support pom/maven libraries, that would be the best round trip engineering tool around.
I ended up using ObjectAid, which is free/cheap and does things well (except spring autowire), lacks communication diagram which was great thing in Altova.
HTH someone...
PS: I use MyEclipse Pro sometimes, decent yearly price, it can do some things from above, you need to see trial version and if UML are suitable for business documentation (too many boxes/packages make diagrams confusing).

Advice for mapping an undocumented Java Eclipse Project

I have started at a new firm and as part of my duties am making small changes on a Java Project that was developed previously. The problem is that it is mostly undocumented and very complex. By undocumented I mean no comments, no Java doc, no documentation guide, nothing. It's a website Java project developed in Eclipse and built using Ant. My question is what tools are available to help me map out the project to better understand it. Or is there any advice on the best set of steps to follow.
Thank you for your time.

Look into reverse engineering tools that can create UML diagrams for java, like omondo. If the ant build script is complex aswell - I once visualized some complex ant build script using yEd, that helped a lot.

I personally found that UML-based tools do not scale well in such cases, except for some very specific cases, where sequence diagrams might help a lot.
Instead, I would refer to the following book (available online) for a general approach to the problem:
http://scg.unibe.ch/download/oorp/
And try out some research tools for code visualization to get an overview, for example:
http://www.inf.usi.ch/faculty/lanza/codecrawler.html
(would love to post more links, but can't due to stackoverflow's spam prevention mechanism)

Slicing Tools for Eclipse

Does anyone know if there are any open source tools for eclipse that can generate static program slices according to the slicing technique outlined by Mark Weiser (http://en.wikipedia.org/wiki/Program_slicing)? I can only seem to find JSlice, which only works for Fedora. Any pointers about how I could tackle this (and libraries out there, or example algorithms for java) would be great.

Disclaimer: I haven't tried the tool listed below.
Indus. It appears to make itself useful via the Kaveri plugin in Eclipse.
It would be worth noting that apart from JSlice and Indus, no other known code slicers for Java appear to be available, although there are quite a few papers that discuss building a code slicer for Java. Sadly, the authors do not appear to have made these tools available for further research.

How about WALA and javaslicer.

For someone coming from Visual Studio/C# background and wants to learn Java - Which should I get: Netbeans or Eclipse?

I'm looking for the following:
A nice debugger that allows me to easily view variable values if I use breakpoints.
Works very nicely in Windows 7.
Has something similar to the Toolbox pane in Visual Studio.
Built in intellisense, and code completion with the TAB key.
Long term support. I mean something that will last and stay in active development for years. I don't want a pet project IDE that will stop developing in a year. I'm just learning so it'll be very dificult at first to switch IDE's.
I'm new so I don't really know which IDE provides what I need between the two. Any help?

Well, I switched from Eclipse to Visual Studio, and I use both just about every day.
I found it hard to get used to the little differences at first, but now I am proficient in both IDEs.
I can't speak to whether or not Netbeans would be easier to learn, but Eclipse shouldn't be hard at all.
Both IDEs will provide all of the features that you have listed, and you should be able to customize both of them to get them to work almost exactly like Visual Studio.

So you want to learn Java and your first question is about which IDE to learn ? I suggest you look at BlueJ which is an IDE designed for people who want to learn Java. From my, I admit limited, experience with the IDEs you mention, BlueJ is the one which gets least in one's way when trying to learn Java as opposed to learning the IDE. Once you've exhausted BlueJ's capabilities there is an easy progression to NetBeans through a plug-in but you would probably not find it too difficult to step up to Eclipse instead.
Yes, I know you want to choose between Eclipse and NetBeans but BlueJ might be of interest.

This is a common debate, and there are obviously merits on both sides (this might be better served as a community wiki page). I prefer Eclipse, but to answer your questions as well as I can briefly:
Works very nicely in Windows 7.
Both are fine.
Has something similar to the Toolbox pane in Visual Studio.
Sorry, not familiar. Neither are short on panes, though Eclipse has a richer cache of third party plugins that might give you the experience you want.
Built in intellisense, and code completion with the TAB key.
I believe both are Ctrl-Space by default. If you're working in Java in Eclipse, there's an automated pop-up after a half second delay each time you type a separator (.) character.
Long term support. I mean something that will last and stay in active development for >years. I don't want a pet project IDE that will stop developing in a year. I'm just >learning so it'll be very dificult at first to switch IDE's.
Both are very mature products. I'd imagine Eclipse's fortunes are a little more secure simply because NetBeans might experience some turbulence during the Oracle acquisition of Sun.
My only other comment is that it's always seemed to me that Netbeans had far nicer "click-and-go" project templates out of the box, while Eclipse offered richer third party library integrations and a better debugger.

Probably both will do. Personally, I'd rather use Netbeans, because it's easier to get started right-out-of-the box. Eclipse depends more on plugins.

Why not try both and see which one suits your individual tastes more?

Both are find but if you want to build GUI's, Netbeans has the edge as it has a built in GUI builder, including a toolbox of controls to use with it.
Eclipse does not have a GUI builder. The commercial Eclipse distribution, MyEclipse does have a GUI builder - it's actually the one from Netbeans.

Neither Intellij IDEA is the Cadillac of Java IDEs

Netbeans = Great out of box experiance
Eclipse = Highly customizable with plugins and (so I've heard) slightly better intellisence-like capabilities.
If possible, I'd say try both (despite the bandwidth problem). If you get basic Java Development versions, the sizes aren't that big (48 MB for NetBeans and 92 MB for Eclipse)
I personally prefer NetBean's in-built capabilities since I don't like having to install plugins to make my experience the way I want it (and not all Eclipse plugins are free) but most of my fellow java devs prefer Eclipse's simplicity and ease of use.

I think you should try Intellij Idea, it the most powerful-intuitive java IDE I've never seen (http://www.jetbrains.com/idea/index.html). The new Community Edition is free and more than enough for java developpement. As it is highly configurable you can choose 'TAB' for auto completion, but I think you can learn from existing combinations that are well design.
Regards.

Java has some really nice IDEs available and many will do what you require.
I dont know you, but I use VS with Resharper so I m very used to those shortcuts, if you do too then have a look at IntelliJ ( they have a comunity edition)
Otherwise you can get eclipse and get the IntelliJ keymap ( or try to get the default VS keymap)
Netbeans is nice too, but I had some problems with it ( ie didnt build, rancomly crashing, etc)
Also most offer Source Control integration ( in Eclipse you have many flavours of subversion for example)
I guess you ll have to play around and find what suits you
Cheers