There are some pretty good resources and tutorials on the main Eclipse and IBM&#39;s site. One of the best ways is to pick an open source plug-in that has some similar features to what you want to do and start to dissect it.

  - *[PDE Does Plug-ins][1]*
  - *[Plug-in development 101, Part 1: The fundamentals][2]*
  - *[Eclipse Plugins Exposed, Part 1: A First Glimpse][3]*
  - *[Developing Eclipse plug-ins][4]*

  [1]: http://www.eclipse.org/articles/Article-PDE-does-plugins/PDE-intro.html
  [2]: http://www.ibm.com/developerworks/library/os-eclipse-plugindev1/index.html
  [3]: http://www.onjava.com/pub/a/onjava/2005/02/09/eclipse.html
  [4]: http://www.ibm.com/developerworks/opensource/library/os-ecplug/


Eclipse has a pretty good &quot;[Your First Plug-in][1]&quot; tutorial.  If it is confusing, I&#39;m sure they would greatly appreciate your feedback.  Keep in mind that Eclipse is essentially Java, so if you don&#39;t have a good grasp of Java go for general Java tutorials first, and then come back to Eclipse development.

O&#39;Reilly has two good Eclipse Plugin tutorials:

  - [Eclipse Plugins Exposed][2]
  - [Develop Your Own Plugins for Eclipse][3]

They not only go through the simple code examples, but give you screen shots of the process since a lot of work is done through wizard type interface windows.  

If these aren&#39;t helpful, perhaps you could be more specific as to what is difficult to follow.

-Adam


  [1]: http://www.eclipse.org/articles/Article-Your%20First%20Plug-in/YourFirstPlugin.html
  [2]: http://www.onjava.com/pub/a/onjava/2005/02/09/eclipse.html
  [3]: http://www.onjava.com/pub/a/onjava/2004/08/18/eclipseplugins.html

The best step-by-step that covers almost every aspect of plugin development is the book &quot;Eclipse: Building Commercial Quality Plugins&quot;.

It&#39;s available at most book shops and electronically at safari:
http://safari.oreilly.com/9780321574435

I found a great Eclipse plugin tutorial named *[Extending Eclipse - Plug-in Development Tutorial][1]*.

  [1]: http://cvalcarcel.wordpress.com/2009/07/08/writing-an-eclipse-plug-in-part-1-what-im-going-to-do/


I think a very good resource is also to look at the examples that are available via the new Plug-In Project wizard.

Depending on what you want to provide with your plug-in, you can choose from editor plug-ins, view plug-ins, plug-ins that provide a property page (just to name a few) and see how they&#39;re built and what extension points they implement.

I&#39;m reloading a web page that has the following code:

    &lt;label for=&quot;showimage&quot;&gt;Show Image&lt;/label&gt;
    &lt;input id=&quot;showimage&quot; name=&quot;showimage&quot; type=&quot;checkbox&quot; value=&quot;1&quot; /&gt;

Even though the HTML stays sent to the browser is the same for each reload of the page, the checkbox always takes on the checked value when a reload was performed.  In other words, if the user checks the checkbox and reloads, the checkbox is still checked.

Is there some caching going on here?  

__Edit__: I tried Gordon Bell&#39;s solution below and find that this is still happening even after removing the value=&quot;1&quot;.  Anything else I might be missing?

    &lt;label for=&quot;showimage&quot;&gt;Show Image&lt;/label&gt; 
    &lt;input id=&quot;showimage&quot; name=&quot;showimage&quot; type=&quot;checkbox&quot; /&gt; 



Why does the checkbox stay checked when reloading the page?

How can I continuously capture images from a webcam?

I want to experiment with object recognition (by maybe using java media framework). 

I was thinking of creating two threads

one thread:

  - Node 1: capture live image
  - Node 2: save image as &quot;1.jpg&quot;
  - Node 3: wait 5 seconds
  - Node 4: repeat...

other thread:

  - Node 1: wait until image is captured
  - Node 2: using the &quot;1.jpg&quot; get colors
    from every pixle
  - Node 3: save data in arrays
  - Node 4: repeat...



Capturing image from webcam in java?

How can I start writing a plugin for [Eclipse][1]?

I&#39;ve looked for documentation, but unfortunately there is very little or it&#39;s poor, so what articles can recommended?

  [1]: http://en.wikipedia.org/wiki/Eclipse_%28software%29


How to write a plugin for Eclipse?

<p>How can I start writing a plugin for <a href="http://en.wikipedia.org/wiki/Eclipse_%28software%29" target="_blank" rel="noopener noreferrer">Eclipse</a>?</p>
<p>I've looked for documentation, but unfortunately there is very little or it's poor, so what articles can recommended?</p>


Per the Java documentation, the [hash code][1] for a `String` object is computed as:

&gt;     s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1]
&gt; using &lt;code&gt;int&lt;/code&gt; arithmetic, where &lt;code&gt;s[i]&lt;/code&gt; is the
 &lt;i&gt;i&lt;/i&gt;th character of the string, &lt;code&gt;n&lt;/code&gt; is the length of
 the string, and &lt;code&gt;^&lt;/code&gt; indicates exponentiation.

Why is 31 used as a multiplier?

I understand that the multiplier should be a relatively large prime number. So why not 29, or 37, or even 97?

  [1]: http://java.sun.com/javase/6/docs/api/java/lang/String.html#hashCode()

Why does Java&#39;s hashCode() in String use 31 as a multiplier?

I have a [JPanel][1] to which I&#39;d like to add JPEG and PNG images that I generate on the fly.

All the examples I&#39;ve seen so far in the [Swing Tutorials][2], specially in the [Swing examples][3] use `ImageIcon`s.

I&#39;m generating these images as byte arrays, and they are usually larger than the common icon they use in the examples, at 640x480.

 1. Is there any (performance or other) problem in using the ImageIcon class to display an image that size in a JPanel?
 2. What&#39;s the *usual* way of doing it?
 3. How to add an image to a JPanel without using the ImageIcon class?

**Edit**: A more careful examination of the tutorials and the API shows that you cannot add an ImageIcon directly to a JPanel. Instead, they achieve the same effect by setting the image as an icon of a JLabel. This just doesn&#39;t feel right...

  [1]: http://download.oracle.com/javase/1.4.2/docs/api/javax/swing/JPanel.html
  [2]: http://java.sun.com/docs/books/tutorial/uiswing/
  [3]: http://java.sun.com/docs/books/tutorial/uiswing/examples/components/


How to add an image to a JPanel?

What&#39;s the difference between [`java.lang.ref.WeakReference`](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ref/WeakReference.html) and [`java.lang.ref.SoftReference`](https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/lang/ref/SoftReference.html) ?

What&#39;s the difference between SoftReference and WeakReference in Java?

I have got a template class as follows:

    class MyClass&lt;T&gt;
    {
        T field;
        public void myMethod()
        {
           field = new T(); // gives compiler error
        }
    }

How do I create a new instance of T in my class?

Instantiating object of type parameter

I&#39;m trying to implement paging using row-based limiting (for example: `setFirstResult(5)` and `setMaxResults(10)`) on a Hibernate Criteria query that has joins to other tables.

Understandably, data is getting cut off randomly; and the reason for that is explained [here][1].

As a solution, the page suggests using a &quot;second sql select&quot; instead of a join. 

How can I convert my existing criteria query (which has joins using `createAlias()`) to use a nested select instead?

  [1]: https://developer.jboss.org/wiki/HibernateFAQ-AdvancedProblems#jive_content_id_Hibernate_does_not_return_distinct_results_for_a_query_with_outer_join_fetching_enabled_for_a_collection_even_if_I_use_the_distinct_keyword

How to get distinct results in hibernate with joins and row-based limiting (paging)?

I was intending to have a play with git, and was wondering if anyone had used the [git plugin for eclipse](http://www.eclipse.org/egit/)

I see it&#39;s at version 0.3.1, and was wondering if anyone knew how stable it was / any gotchas?

---

Update:

If you are using a recent version of Eclipse, your Help menu has an &#39;Eclipse Marketplace...&#39; link. 

Enter &#39;git&#39; in the Find field. This shows me EGit. 

This is also very high in the Popular plugins list.

Click install. Much easier than having to add update site locations by hand.



How stable is the git plugin for eclipse?

There is two available Eclipse plugins for Maven :

  - [Eclipse IAM][1] (old name is Q4E)
  - [m2eclipse][2]

m2eclipse seems to be the oldest but the more robust. Is there any key differences between the two ?

Which one should be chosen for a project starting today and why ?

**UPDATE:** m2eclipse is moving to eclipse.org and will be included in the Indigo release train (Eclipse 3.7). See [m2e at Eclipse: What will this mean for you?][3] and [m2eclipse is moving to eclipse.org!][4]. The accepted answer is thus even more correct.

  [1]: http://www.eclipse.org/proposals/iam/
  [2]: http://m2eclipse.codehaus.org/
  [3]: http://www.sonatype.com/people/2010/12/m2e-at-eclipse-what-will-this-mean-for-you/
  [4]: http://www.eclipse.org/m2e/

Which is the best Maven Eclipse plugin?

I am using Maven (and the Maven Eclipse Integration) to manage the dependencies for my Java projects in Eclipse. The automatic download feature for JAR files from the Maven repositories is a real time saver. Unfortunately, it does not include API documentation and source code.

How can I set up Maven to automatically also get the source and javadoc attachments and register them properly with Eclipse?

Get source jar files attached to Eclipse for Maven-managed dependencies

I know I can configure command line arguments in the Run configuration but I want to run a java file multiple times with different command line arguments. It&#39;s a pain to change the Run Configuration every time.

Is there a way I can make Eclipse prompt me for command line arguments every time I run the program?



How to make Eclipse prompt me for command line arguments

The following code

    public class GenericsTest2 {
    
        public static void main(String[] args) throws Exception {
            Integer i = readObject(args[0]);
            System.out.println(i);
        }
    
        public static &lt;T&gt; T readObject(String file) throws Exception {
            return readObject(new ObjectInputStream(new FileInputStream(file)));
            // closing the stream in finally removed to get a small example
        }
    
        @SuppressWarnings(&quot;unchecked&quot;)
        public static &lt;T&gt; T readObject(ObjectInputStream stream) throws Exception {
            return (T)stream.readObject();
        }
    }

compiles in eclipse, but not with javac (type parameters of &lt;T&gt;T cannot be determined; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object). 

When I change readObject(String file) to 

        @SuppressWarnings(&quot;unchecked&quot;)
        public static &lt;T&gt; T readObject(String file) throws Exception {
            return (T)readObject(new ObjectInputStream(new FileInputStream(file)));
        }

it compiles in eclipse and with javac. Who is correct, the eclipse compiler or javac?


Bug in eclipse compiler or in javac (&quot;type parameters of T cannot be determined&quot;)

I need some resources that talk about how to design your software to be extensible, i.e. so that other people can write add-ons/plug-ins that adds functionality to it.

What do you recommend? Any books out there that discuss the subject?  
I would prefer something that&#39;s short and to the point; a bit of theory and a bunch of concrete examples.

I&#39;m not targeting a specific language, I want to be able to understand the core idea so that I can implement it in any language.  

And for the same reason, I prefer not to do it using a framework that someone else built (unless the framework is not very high-level, i.e. doesn&#39;t hide _too_ much), at the moment I only want to educate myself on the subject and experiment with various ways to implement it. Plus, a framework usually assumes user&#39;s knowledge about the subject.

**UPDATE**

I&#39;m not asking about OOP or allowing my classes to be inherited. I&#39;m talking about designing an application that will be deployed on a system, such that it can be extended by third-party add-ons AFTER its been deployed.

For example, Notepad++ has a plug-in architecture where you can place a .dll file in the plugins folder, and it adds functionality to the application that wasn&#39;t there, such as color-picking, or snippet insertion, or many other things (a wide range of functionality).

How to design extensible software (plugin architecture)?

The GUI for managing plugins in Eclipse got a bit of an overhaul in version 3.4.0. 
This GUI is accessed via the &quot;Software Updates...&quot; option in the Help menu. 


The option to remove the selected Mylyn plugin is greyed out. In fact, this is true of virtually every installed plugin. I know that the Mylyn plugins are optional, so why amn&#39;t I provided with an option to remove them?



How to uninstall plugins in Eclipse 3.4.X or higher

How would you implement a Plugin-system for your Java application?

Is it possible to have an easy to use (for the developer) system which achieves the following:

 - Users put their plugins into a subdirectory of the app
 - The Plugin can provide a configuration screen
 - If you use a framework, is the license compatible with commercial developement?

Best way to build a Plugin system with Java

In a simulation server environment where users are allowed to submit their own code to be run by the server, it would clearly be advantageous for any user-submitted code to be run in side a sandbox, not unlike Applets are within a browser.  I wanted to be able to leverage the JVM itself, rather than adding another VM layer to isolate these submitted components.

This kind of limitation appears to be possible using the existing Java sandbox model, but is there a dynamic way to enable that for just the user-submitted parts of a running application?

Sandbox against malicious code in a Java application

Has anyone managed to get Vim integrated into Eclipse painlessly? I just want to use Vim for the editor while retaining the general Eclipse interface. I have tried using Eclim plugin but the editor seemed to crash more often than work (the site said that the editor replacement functionality is still beta).

On the flip side, is there any IDE which matches Eclipse&#39;s functionality&amp;mdash;mainly the integration with SVN, ant, etc.&amp;mdash;and is also able to use Vim?

I mostly use eclipse for SAS SCL, Java and Javascript programming and find the eclipse editor too &quot;mouse-y&quot;.

I&#39;d also like, in a perfect world, to use vimdiff as a diff viewer for SVN (we use TortoiseSVN) while checking for diffs or conflicts during merge etc. I admit I havent spent a lot of time trying to get these things to work. I feel guilty about spending too much time on potential wild-goose-chases while my other team members are working away at their code, perfectly content with all that Eclipse has to offer.

Edit: Just found this while desperately browsing around: [Vim plugin](http://vimplugin.org/). Any experience using this? From the claims on the site, it sounds perfect.

Content Type	Original Author	Original Content on Stackoverflow
Question	Agusti-N	View Question on Stackoverflow
Solution 1 - Java	David Schlosnagle	View Answer on Stackoverflow
Solution 2 - Java	Adam Davis	View Answer on Stackoverflow
Solution 3 - Java	jdoklovic	View Answer on Stackoverflow
Solution 4 - Java	Junv	View Answer on Stackoverflow
Solution 5 - Java	fhe	View Answer on Stackoverflow

How to write a plugin for Eclipse?

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Capturing image from webcam in java?

Why does the checkbox stay checked when reloading the page?

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