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markiewb's blog - April 18, 2014 12:13 PM
Some impressions from the NetBeans platform training in Leipzig

IMG_20140416_122649 IMG_20140416_132247 IMG_20140416_132257 IMG_20140416_132309


Adam Bien - April 18, 2014 07:53 AM
Java 8, Method Handles and Concurrency Utilities For Java EE

Java 8 with method handles enables direct execution of synchronous (legacy) code asynchronously within a managed thread pool:

Prepare your questions—I will attempt to answer them…live. See you soon!

See also other screencasts at: http://tv.adam-bien.com or subscribe to http://www.youtube.com/user/bienadam.

See you at Java EE Workshops at MUC Airport!

Real World Java EE Workshops [Airport Munich]>

Geertjan's Blog - April 17, 2014 07:41 PM
Three Tips for DukeScript Fanboys

Here's my advice for DukeScript fanboys, of which there are some, but mainly two: Jaroslav Tulach and Toni Epple.

  1. Stop talking about "DukeScript". Whenever you say "DukeScript", any sane person assumes you're talking about a language. You're not. And that's what's confusing. You're talking about a framework. The DukeScript Framework is equivalent to HTML5 minus JavaScript plus Java. That's it. And that's a powerful message.

  2. Stop playing games. Instead, create real applications. Create CRUD applications, for example. Here's my humble first beginning, showing data from the Sample database in GlassFish displayed in HTML via Java in the JavaFX WebView thanks to the DukeScript Framework:

    But, please, make several complete scenarios that run out of the box, including, and especially, CRUD apps. This is where Vaadin and PrimeFaces have succeeded so far, i.e., they have complete widget samples, component demos, etc, etc, etc. Focus on business scenarios, not funny games.

  3. Seriously, sit down and think about all that stuff that you're exposing. Vaadin somehow gets away with it, because they're based on a known entity, i.e., GWT, and the DukeScript Framework should be able to do so, too. There's just so much going on in the background, it's scary. Somehow, you need to at least explain absolutely everything. Either shit or get off the pot, i.e., describe fully what's going on in the implementation or accept that it's going to be adopted by a small subset of developers. Since all the ideas in the DukeScript Framework are so completely brand new and so much magic is done via annotations, you either explain it all, down to the smallest details, or run the risk that no one will adopt it because, since there are several more understandable competitors, you're running the risk that something simpler, e.g., Vaadin, is going to become the standard, whether de-facto or not.
My two cents. And I have never been (very) wrong.

NetBeans Zone - The social network for developers - April 17, 2014 05:33 AM
Vaadin and NetBeans: Transporting Desktop Users to the Web

Bruno Freitas lives and works in Porto, Portugal, at BMAC, a private healthcare company. He is a software engineer building internal applications, while handling integration requirements with 3rd party software. As needed, he also manages Linux servers, databases, and network systems. Preview Text:  Bruno Freitas describes how NetBeans IDE...

Geertjan's Blog - April 16, 2014 10:14 PM
Swedish Economy Modeling on the NetBeans Platform

WamSys AB, located in Gothenburg, Sweden, focuses on developing products with Oracle DB and the NetBeans Platform.

In particular, the NetBeans Platform is used as the basis of their Mozart Platform, which provides generic modules for custom Swing components, including a table component with support for grouping, "frozen" rows and columns, and built-in aggregates.

Furthermore, the Mozart Platform facilitates the building of products on top of it. For example, it has its own widget framework, providing a customizable start page comparable to a web portal, while the Options window manages look & feel properties, such as support for switching to the JTattoo look and feel.

Here you can see a YouTube clip of the Mozart table component:


And here is a YouTube clip of the Mozart dashboard:


One of the products based on the Mozart Platform is Mozart Economy, a fully customizable billing system able to calculate fees based on complex conditions and provide data for invoicing. The system is used by Swedish schools for calculation of fees paid in preschool, where many different factors affect the price, such as the child's age, family income, and number of hours at school. The module corrects invoices over any period back in time with respect to changed conditions over time.

Another part of the solution is Mozart Statistics, which retrieves data from a database and creates statistical reports in Microsoft Excel, using the Apache POI library.  This enables customers to get powerful statistical reports with pivot tables and various type of charts.

NetBeans Zone - The social network for developers - April 15, 2014 09:09 PM
NetBeans Weekly News (Issue #635 - Apr 14, 2014)

Project News Plugin: Scala for NetBeans Caoyuan Deng has upgraded the Scala plugin for NetBeans 8! Get started with it today. Python in NetBeans IDE 8.0 Build Python projects in NetBeans 8 using the NetBeans-Python plugin. Preview Text:  In this issue: Working with Scala and Python in NetBeans 8.0; Using PrimeFaces' layout component; a...

Geertjan's Blog - April 15, 2014 06:08 PM
DukeScript Framework for Dummies

Jaroslav Tulach's Java/JavaScript framework DukeScript explained for dummies (e.g., me):

Or watch it here:


Further info:




APIDesign - Blogs - April 15, 2014 12:35 PM
Coolest NetBeans Plugin: MineSweeper!

MineSweeper is re-implementation of classical computer game available on each Microsoft Windows since the initial introduction in version 3.1. Surprisingly my kids (who otherwise spend hours with tablets) knew nothing about the game until...

I needed a demonstration for DukeScript technology that is using Java to code the application logic and HTML to render its UI. I decided to write a MineSweeper game as a basic demo. I've managed to execute the demo in a browser (via TeaVM) and Android (via DlvkBrwsr), but today I achieved another milestone: the MineSweeper module is available for every user of NetBeans 8.0!

Get the module via Tools/Plugins or visit its plugin page and enjoy your productivity boost!

In case you are interested in trying the code yourself, here is a way to get the sources:

$ hg clone http://source.apidesign.org/html~demo/
$ cd html~demo/
$ hg up -C 3d99b96ffbd4
$ mvn install
$ cd minesweeper/
$ mvn -Pnbrwsr install
# generates target/minesweeper-1.0-SNAPSHOT.nbm

and the system generates an NBM (NetBeans module file) which can be installed into your NetBeans! Give it a try and let's make NetBeans better by using more DukeScript APIs! Don't forget that you can package the same application to run on Android or in a browser. Become a developer that can: Write once, run anywhere!

--JaroslavTulach 12:35, 15 April 2014 (UTC)

Adam Bien - April 15, 2014 08:37 AM
Java 8: Reducing a List Into A CSV String

import java.util.ArrayList;
import java.util.List;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.*;
import org.junit.Test;

public class CSVStreamTest {

    public void listToString() {
        List<String> mascots = new ArrayList<>();

        String expected = "duke,juggy";
        String actual = mascots.stream().
                reduce((t, u) -> t + "," + u).
        assertThat(actual, is(expected));

See you at Java EE Workshops at MUC Airport!

Real World Java EE Workshops [Airport Munich]>

Michael's blog » NetBeans - April 14, 2014 09:24 PM
Using Lambda expressions with JSF 2.2

JSF 2.2 comes in conjunction with EL 3.0. This version of the expression language offers a rarely known highlight: It is capable of using lambda expressions and streams. Even thought defined withing the Jave EE 7 spec (and not Java … Continue reading

Adam Bien - April 14, 2014 11:48 AM
How To Tackle JavaEE - DevCrowd Keynote

How to structure a JavaEE application? How to organize your code? What are the essential ingredients of a maintainable JavaEE application? How to be productive with JavaEE?

I discussed such questions during the DevCrowd keynote: http://2014.devcrowd.pl/agenda/.

Warning: I used slides in the first part of the keynote :-).

Any questions left? Prepare your questions and I will attempt to answer them …live. Drop a comment / question && see you at each first Monday of the month at 6 p.m (CET) [http://www.ustream.tv/channel/adambien]!

See you at Java EE Workshops at MUC Airport, particularly at the Java EE Architectures workshop, screencasts at: http://tv.adam-bien.com or subscribe to http://www.youtube.com/user/bienadam.!

Real World Java EE Workshops [Airport Munich]>

Geertjan's Blog - April 11, 2014 08:14 AM
Python in NetBeans IDE 8.0

Copy this to the clipboard:


Then go to Tools | Plugins and open the Settings tab. Add the above as a new update center:

Then switch to the Available Plugins tab and you'll see the Python plugin:

Install the Python plugin:

Then create a new Python project, using the New Project dialog:

Give it a name and choose your platform. Either import existing sources as a new Python project...

...or create a Python project from scratch:

Then you have an editor with code completion, other editor features, plus a debugger:

Right-click a project to see a bunch of Python commands:

Add to the classpath after right-clicking a project and choosing Properties:

That's it, you're now ready to use Python in NetBeans IDE.

Geertjan's Blog - April 10, 2014 07:00 AM
Context-Sensitive TopComponent (Part 2)

Another way a TopComponent can be context sensitive is in the requirement that the menubar and toolbar need to relate to a specific TopComponent. Below you see that when Win1 is active, a different group of menus and toolbars is available...

... than when Win2 is active:

Part of the solution to this is described here recently about multiple rows of toolbars. However, this only addresses the topic of toolbars. What about menubars? And maybe other components too? I.e., when a TopComponent is active, it would be great if a subfolder of the FileSystem would become enabled, while all other parts would become disabled.

The complete solution to this scenario has been described before, here. Jesse Glick has all the code for this here:


What the above lets you do is create layer entries like this:

<folder name="win1">
    <folder name="Menu">
        <folder name="First">
            <attr name="position" intvalue="150"/>
        <file name="Help.hidden"/>
    <folder name="Toolbars">
        <file name="UndoRedo.hidden"/>
<folder name="win2">
    <folder name="Menu">
        <folder name="Second">
            <attr name="position" intvalue="250"/>

Then, each TopComponent can specify which folder they want to own:

associateLookup(Lookups.singleton(new SystemSubPathLayerProvider("win1")));

The "SystemSubPathLayerProvider" does all the work in the background to enable and disable items appropriately, whether they are toolbars, menubars, or whatever else.

Nothing is written to disk, this is all done programmatically within the code, and not written to the user directory.

Geertjan's Blog - April 09, 2014 07:00 AM
Context-Sensitive TopComponent (Part 1)

I picked up a cool idea from a Polish developer, Dominik Cebula, recently. In the same way that the NetBeans Platform has context sensitive Actions, there should be context sensitive TopComponents.

Only if an Object of a specific type specified in the public constructor of the TopComponent is found in the Lookup should it be possible to open the TopComponent. And then the Object is available to the TopComponent, without the TopComponent needing to implement a LookupListener.

For example, below "FlightLeg Editor" and "Delay Editor" are both disabled, because no "FlightLeg" and no "Delay" is in the Lookup. Hence it doesn't make sense to open the editor, i.e., when the Object for which the editor exists is not available.

On the other hand, below a "FlightLeg" is available in the Lookup, because one of the flight legs has been selected and hence the underlying "FlightLeg" object is now in the Lookup. Therefore, the "FlightLeg Editor" menu item is enabled so that an editor can be opened for editing the selected flight leg:

In the same way, here the "Delay Editor" can be opened, because an Object of the type "Delay" is published when a DelayNode is selected:

Here is one of these TopComponents:

        preferredID = "FlightLegEditorTopComponent",
        persistenceType = TopComponent.PERSISTENCE_ALWAYS
        mode = "editor", 
        openAtStartup = false)
        category = "Window", 
        id = "org.cool.viewer.FlightLegEditorTopComponent")
        path = "Menu/Window")
        displayName = "#CTL_EditorAction",
        preferredID = "FlightLegEditorTopComponent"
    "CTL_EditorAction=FlightLeg Editor",
public class FlightLegEditorTopComponent extends ObjectTopComponent implements ActionListener{
    private FlightLeg fl;
    //no-arg constructor is required:
    private FlightLegEditorTopComponent() {}
    public FlightLegEditorTopComponent(FlightLeg fl) {
        this.fl = fl;
    public void actionPerformed(ActionEvent e) {

In the above, notice there is a public constructor that receives the domain object "FlightLeg" (i.e., for an airline-type application). Also, there's a new annotation up there, "@ObjectTopComponent.OpenActionForObjectRegistration".

Here's what that annotation looks like (copied and then simply renamed from "@TopComponent.OpenActionRegistration"):

public class ObjectTopComponent extends TopComponent {
    @Target({ ElementType.TYPE, ElementType.METHOD })
    public static @interface OpenActionForObjectRegistration {
        String displayName();
        String preferredID() default "";

However, the annotation above is processed in such a way that a context-sensitive Action is created that uses the type in the constructor of the TopComponent:

@ServiceProvider(service = Processor.class)
public final class ObjectTopComponentProcessor extends LayerGeneratingProcessor {
    public ObjectTopComponentProcessor() {
    public Set<String> getSupportedAnnotationTypes() {
        Set<String> hash = new HashSet<String>();
        return hash;
    protected boolean handleProcess(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) throws LayerGenerationException {
        for (Element e : roundEnv.getElementsAnnotatedWith(ObjectTopComponent.OpenActionForObjectRegistration.class)) {
            ObjectTopComponent.OpenActionForObjectRegistration reg = e.getAnnotation(ObjectTopComponent.OpenActionForObjectRegistration.class);
            assert reg != null;
            Description info = findInfo(e);
            ActionID aid = e.getAnnotation(ActionID.class);
            if (aid != null) {
                File actionFile = layer(e).
                        file("Actions/" + aid.category() + "/" + aid.id().replace('.', '-') + ".instance").
                        methodvalue("instanceCreate", "org.openide.windows.TopComponent", "openAction");
                actionFile.instanceAttribute("component", TopComponent.class, reg, null);
                if (reg.preferredID().length() > 0) {
                    actionFile.stringvalue("preferredID", reg.preferredID());
                generateContext(e, actionFile);
                actionFile.bundlevalue("displayName", reg.displayName(), reg, "displayName");
                if (info != null && info.iconBase().length() > 0) {
                    actionFile.stringvalue("iconBase", info.iconBase());
        return true;
    private void generateContext(Element e, File f) throws LayerGenerationException {
        ExecutableElement ee = null;
        ExecutableElement candidate = null;
        for (ExecutableElement element : ElementFilter.constructorsIn(e.getEnclosedElements())) {
            if (element.getKind() == ElementKind.CONSTRUCTOR) {
                candidate = element;
                if (!element.getModifiers().contains(Modifier.PUBLIC)) {
                if (ee != null) {
                    throw new LayerGenerationException("Only one public constructor allowed", e, processingEnv, null); // NOI18N
                ee = element;
        if (ee == null || ee.getParameters().size() != 1) {
            if (candidate != null) {
                throw new LayerGenerationException("Constructor has to be public with one argument", candidate);
            throw new LayerGenerationException("Constructor must have one argument", ee);
        VariableElement ve = (VariableElement) ee.getParameters().get(0);
        TypeMirror ctorType = ve.asType();
        switch (ctorType.getKind()) {
            case ARRAY:
                String elemType = ((ArrayType) ctorType).getComponentType().toString();
                throw new LayerGenerationException("Use List<" + elemType + "> rather than " + elemType + "[] in constructor", e, processingEnv, null);
            case DECLARED:
                break; // good
                throw new LayerGenerationException("Must use SomeType (or List<SomeType>) in constructor, not " + ctorType.getKind());
        DeclaredType dt = (DeclaredType) ctorType;
        String dtName = processingEnv.getElementUtils().getBinaryName((TypeElement) dt.asElement()).toString();
        if ("java.util.List".equals(dtName)) {
            if (dt.getTypeArguments().isEmpty()) {
                throw new LayerGenerationException("Use List<SomeType>", ee);
            f.stringvalue("type", binaryName(dt.getTypeArguments().get(0)));
            f.methodvalue("delegate", "org.openide.awt.Actions", "inject");
            f.stringvalue("injectable", processingEnv.getElementUtils().getBinaryName((TypeElement) e).toString());
            f.stringvalue("selectionType", "ANY");
            f.methodvalue("instanceCreate", "org.openide.awt.Actions", "context");
        if (!dt.getTypeArguments().isEmpty()) {
            throw new LayerGenerationException("No type parameters allowed in ", ee);
        f.stringvalue("type", binaryName(ctorType));
        f.methodvalue("delegate", "org.openide.awt.Actions", "inject");
        f.stringvalue("injectable", processingEnv.getElementUtils().getBinaryName((TypeElement) e).toString());
        f.stringvalue("selectionType", "EXACTLY_ONE");
        f.methodvalue("instanceCreate", "org.openide.awt.Actions", "context");
    private String binaryName(TypeMirror t) {
        Element e = processingEnv.getTypeUtils().asElement(t);
        if (e != null && (e.getKind().isClass() || e.getKind().isInterface())) {
            return processingEnv.getElementUtils().getBinaryName((TypeElement) e).toString();
        } else {
            return t.toString(); // fallback - might not always be right
    private Description findInfo(Element e) throws LayerGenerationException {
        Element type;
        switch (e.asType().getKind()) {
            case DECLARED:
                type = e;
            case EXECUTABLE:
                type = ((DeclaredType) ((ExecutableType) e.asType()).getReturnType()).asElement();
                throw new LayerGenerationException("" + e.asType().getKind(), e);
        TopComponent.Description info = type.getAnnotation(TopComponent.Description.class);
        return info;

The above processor is a combination of the TopComponentProcessor and the ActionProcessor in the NetBeans Platform.

And now you have a layer generating processor that creates a context sensitive Action for opening a TopComponent. If no Object of the type specified in the constructor of the TopComponent is in the Lookup, the Action will be disabled. If an Object of the specified type is available, the Action is enabled and immediately available to the TopComponent as soon as it is opened.

That's an example of a view that is bound to a model. Useful for editors that need to be created for one or more specific Objects. Data binding for TopComponents, hurray.

Geertjan's Blog - April 08, 2014 04:28 PM
Disable Module on Authentication Failure

The user starts the application. The splash screen is shown. Right after the modules are loaded, as indicated by the text in the splash screen, a small login screen appears. The user fills in the wrong login credentials and clicks OK. The text in the splash screen shows that one or more modules are being turned off. Then the main window of the application appears. Because the login credentials were wrong, one or more of the modules have been disabled. 

import java.util.List;
import org.netbeans.api.autoupdate.OperationContainer;
import org.netbeans.api.autoupdate.OperationException;
import org.netbeans.api.autoupdate.OperationSupport;
import org.netbeans.api.autoupdate.UpdateElement;
import org.netbeans.api.autoupdate.UpdateManager;
import org.netbeans.api.autoupdate.UpdateUnit;
import org.openide.DialogDisplayer;
import org.openide.NotifyDescriptor;
import org.openide.modules.OnStart;
import org.openide.util.Exceptions;

public class Startable implements Runnable {
    public void run() {
        NotifyDescriptor.InputLine nd = new NotifyDescriptor.InputLine("Name", "Login");
        //Got tired of typing it by hand:
        Object response = DialogDisplayer.getDefault().notify(nd);
        if (response == NotifyDescriptor.OK_OPTION) {
            String username = nd.getInputText();
            NotifyDescriptor.Message msg;
            if (!username.equals("admin")) {
                List<UpdateUnit> updateUnits = 
                for (UpdateUnit updateUnit : updateUnits) {
                    //Get each module that is installed:
                    UpdateElement el = updateUnit.getInstalled();
                    //Of those that are installed, if it has the code name base
                    //of the module we are interested in, and it is enabled,
                    //continue with this procedure to disable it:
                    if (el != null
                            && el.getCodeName().equals("com.mycompany.admin")
                            && el.isEnabled()) {
                        try {
                            //Specify how we want to handle the module; 
                            //here, we want to disable it:
                            OperationContainer oc = OperationContainer.createForDirectDisable();
                            //Finally, do the operation,
                            //passing a progress handle or, as in this case, null:
                            OperationSupport supp = (OperationSupport) oc.getSupport();
                        } catch (OperationException ex) {

Finally, the module is not shown in the Plugin Manager, so that it cannot be enabled from there. Only if the user logs in correctly is the module enabled.

Related reading:

Adam Bien - April 08, 2014 09:55 AM
1st Airhacks Q&A And The Answers Are:

Additional 10 live questions, 1h and 83 live views. The first edition Airhacks Q & A was fun for me. I started with answering the 10 proposed questions, then got additional blog comments, tweets and chats in real time. After a 1h I had to catch QuestionsOverflowException and postponed some answers to the 2nd edition of Airhacks Q & A (Monday, May 5th, 6 PM (CET)): http://www.ustream.tv/channel/adambien.

Thanks for all the interactions during the event. It was fun for me ...and I saved lots of time.

Write your questions as comments to this post, drop me a tweet or write a comment on my youtube channel: https://www.youtube.com/user/bienadam. I will pick again the 10 most recent questions and will answer them at the next edition of Airhacks Q & A.

We have sufficient stuff to cover, this blog has about 5000 comments, and probably 20% of that number are unanswered questions.

See you at the regular Java EE Workshops at MUC Airport and particularly at Distributed Computing and Persistence with Enterprise Java. ...and live each first Monday of the month at 6 P.M (CET) http://www.ustream.tv/channel/adambien!

See also other screencasts at: http://tv.adam-bien.com or subscribe to http://www.youtube.com/user/bienadam.

Real World Java EE Workshops [Airport Munich]>

Geertjan's Blog - April 07, 2014 08:33 PM
Multiple Rows of Toolbars

Realized today that toolbars can be placed in different rows:

The above is a result of a file I named "All.xml" that has this content and is found in the same package as the layer.xml file:

<?xml version="1.0"?>
<!DOCTYPE Configuration PUBLIC "-//NetBeans IDE//DTD toolbar//EN"
        <Toolbar name="File" />
        <Toolbar name="UndoRedo" />
        <Toolbar name="Clipboard"/>
        <Toolbar name="Memory"/>

It is registered as follows in the layer.xml file:

<folder name="Toolbars">
    <file name="All.xml" url="All.xml"/>

And then, as a handy final step, here's code in one of my TopComponents for switching between different toolbar definitions:

protected void componentActivated() {
public void componentDeactivated() {

Here's some related reading:

Michael's blog » NetBeans - April 07, 2014 05:32 PM
NetBeans 8 contribution

Due to less time, I sadly could only contribute a small amount to NetBeans 8. Following is the report, I received today. Get inspired to contribute too. Dear NetBeans User, In the past you have taken the time to report … Continue reading

Adam Bien - April 07, 2014 09:36 AM
1st Airhacks Q&A And The Questions Are:

  1. Jeff Picklyk: "How would you suggest convincing the ivory tower decision makers to leave plain old Tomcat + Spring in favour of JavaEE 6 or 7?"
  2. Andreas Haufler: "...and you should evaluate: Do I even need a JavaEE monster? Scalability can be achieved at a much lower price (in terms of learning curve and complexity)."
  3. My thoughts on Controversial 80 characters max withs.
  4. Tony Anecito: "JavaFX and ClassPath"
  5. Alberto Gori: "If this is true, I would say it's better to call em.clear() just after em.flush()."?
  6. Manfred Pauli: "You state you're never design your application by technical structures. Where would you pack exceptions to? Especially if they are used through the whole project. "
  7. Yasser: "I am trying to use your example, but my test fails at "facade.service = service". It looks like my test case doesn't have access to the @EJB Service in the ServiceFacade."
  8. Tim B. "If you have two applications communicate via REST and DTOs are forbidden, how do you share the model between those two?"
  9. Anonymous: "How one generates eg: REST client stubs in Delphi for java endpoints? There is still no widespread WSDL-like tools for REST"
  10. Conversation with Jeanne Boyarsky about @Ignore in unit test

I will at least answer the above questions today. If you have any other questions, just write a comment to this post. There are a few hours left...

You can also ask questions during the show using the built-in chat: or via twitter mentioning me: http://twitter.com/AdamBien (@AdamBien) or using the hashtag: #airhacks.

See you at Java EE Workshops at MUC Airport or on demand and in a location very near you: airhacks.io!

Real World Java EE Workshops [Airport Munich]>

NetBeans Zone - The social network for developers - April 07, 2014 06:38 AM
Tushar Joshi: My 5 Favorite NetBeans IDE Features!

Following on from Ciprian Turcu, Mark Stephens, Josh Preview Text:  Extensible architecture, active community, and other aspects of the NetBeans ecosystem are explained here by Tushar Joshi as his favorite NetBeans features. Legacy Sponsored:  unsponsored ...

Geertjan's Blog - April 06, 2014 07:00 AM

Handy, need to explore this further.

import javax.swing.AbstractButton;
import javax.swing.Action;
import javax.swing.JMenuItem;
import org.openide.awt.Actions;
import org.openide.awt.Actions.ButtonActionConnector;
import org.openide.util.lookup.ServiceProvider;
        service = ButtonActionConnector.class, 
        position = 100)
public class MyButtonActionConnector implements ButtonActionConnector {
   public boolean connect(AbstractButton button, Action action) {
      String text = (String)action.getValue("displayName");
      if (text != null) {
         String desc = (String)action.getValue(Action.SHORT_DESCRIPTION);
         if (desc != null) {
         } else {
         return true;
      return false;
   public boolean connect(JMenuItem item, Action action, boolean popup) {
       return false; // use default implementation

Further reading:




Geertjan's Blog - April 05, 2014 07:00 AM
Creating MultiViewElements on the Fly

Following from the above, here's how to add a new tab in the Java Editor, on the fly (as described here, possible from 8.0 onwards), i.e., when the "Design Custom Component" menu item (which is only available when you right-click a subclass of com.vaadin.ui.CustomComponent, as described yesterday) is clicked:

public void actionPerformed(ActionEvent ev) {
    TopComponent activated = WindowManager.getDefault().getRegistry().getActivated();
    MultiViewHandler mvh = MultiViews.findMultiViewHandler(activated);
    mvh.addMultiViewDescription(new DesignerMVD(), 1);

In short, the above gets you this:

DesignerMVD, referenced above, is as follows:

import java.awt.Image;
import org.netbeans.core.spi.multiview.MultiViewDescription;
import org.netbeans.core.spi.multiview.MultiViewElement;
import org.openide.util.HelpCtx;
import org.openide.util.Utilities;
import org.openide.windows.TopComponent;

public class DesignerMVD implements MultiViewDescription {
    public int getPersistenceType() {
        return TopComponent.PERSISTENCE_NEVER;
    public String getDisplayName() {
        return "Designer";
    public Image getIcon() {
        return null;
    public HelpCtx getHelpCtx() {
        return HelpCtx.DEFAULT_HELP;
    public String preferredID() {
        return "Designer";
    public MultiViewElement createElement() {
        return new DesignMVE(Utilities.actionsGlobalContext());

And DesignerMVE is like this, i.e., a JPanel, which will later contain a Visual Library Scene that visualizes the content of the CustomComponent in some way, so that it can be graphically edited:

import javax.swing.Action;
import javax.swing.JComponent;
import javax.swing.JPanel;
import javax.swing.JToolBar;
import org.netbeans.core.spi.multiview.CloseOperationState;
import org.netbeans.core.spi.multiview.MultiViewElement;
import org.netbeans.core.spi.multiview.MultiViewElementCallback;
import org.openide.awt.UndoRedo;
import org.openide.loaders.DataObject;
import org.openide.util.Lookup;

public class DesignMVE extends JPanel implements MultiViewElement {
    private JToolBar toolbar = new JToolBar();
    private DataObject obj;
    public DesignMVE(Lookup lkp) {
        obj = lkp.lookup(DataObject.class);
        assert obj != null;
    public JComponent getVisualRepresentation() {
        return this;
    public JComponent getToolbarRepresentation() {
        return toolbar;
    public Action[] getActions() {
        return new Action[0];
    public Lookup getLookup() {
        return obj.getLookup();
    @Override public void componentOpened() {}
    @Override public void componentClosed() {}
    @Override public void componentShowing() {}
    @Override public void componentHidden() {}
    @Override public void componentActivated() {}
    @Override public void componentDeactivated() {}
    public UndoRedo getUndoRedo() {
        return UndoRedo.NONE;
    private transient MultiViewElementCallback callback;
    public void setMultiViewCallback(MultiViewElementCallback mvec) {
        this.callback = mvec;
    public CloseOperationState canCloseElement() {
        return CloseOperationState.STATE_OK;

Finally, the action for opening the DesignerMVD is slightly more complex because we don't want a new DesignerMVD whenever the Action is invoked. Specifically, we do not want a new DesignerMVD if the file is already open, since then a new DesignerMVD will already have been created. Hence (thanks to instructions here), we get this:

public void actionPerformed(ActionEvent ev) {
    //Need to make sure to add a designer
    //only if the file hasn't been opened yet,
    //otherwise we'll get a new designer
    //whenever the action is invoked:
    FileObject fileObject = dobj.getPrimaryFile();
    JavaSource javaSource = JavaSource.forFileObject(fileObject);
    if (javaSource != null) {
        try {
            javaSource.runUserActionTask(new Task<CompilationController>() {
                public void run(CompilationController compilationController) throws Exception {
                    Document document = compilationController.getDocument();
                    if (document == null) {
                        TopComponent activated = WindowManager.getDefault().getRegistry().getActivated();
                        MultiViewHandler mvh = MultiViews.findMultiViewHandler(activated);
                        mvh.addMultiViewDescription(new DesignerMVD(), 1);
            }, true);
        } catch (IOException ex) {

A different approach might be to disable the Action when the file has been opened, so that it cannot be invoked again while the file is open, which means the above code would not be needed anymore.

The next step is to work on the Visual Library Scene, which will be contained within the JPanel above, together with a Palette (as described here) that contains all the relevant Vaadin components.

And then we'll have a Visual Designer for Vaadin!

Geertjan's Blog - April 04, 2014 10:33 PM
Popup Action Based on Java Subclass

Climb up the hierarchy (thanks to this) to determine whether a class is a subclass of com.vaadin.ui.CustomComponent and, if so, enable and display a popup menu on it so that it can be opened in a visual designer of some kind.

        category = "Tools",
        id = "org.tc.customizer.DesignCustomComponentAction")
        displayName = "#CTL_DesignCustomComponentAction",
        lazy = false)
    @ActionReference(path = "Loaders/text/x-java/Actions", position = 150)
@Messages("CTL_DesignCustomComponentAction=Design Custom Component")
public final class DesignAbstractFormAction extends AbstractAction implements ContextAwareAction {
    private final DataObject dobj;
    private static Map args = new HashMap();
    public DesignAbstractFormAction() {
    public DesignAbstractFormAction(Lookup context) {
        this.dobj = context.lookup(DataObject.class);
        JavaSource javaSource = JavaSource.forFileObject(dobj.getPrimaryFile());
        if (javaSource != null) {
            try {
                javaSource.runUserActionTask(new ScanForObjectTask(this), true);
            } catch (IOException ex) {
        //Hide the menu item if it isn't enabled:
        putValue(DynamicMenuContent.HIDE_WHEN_DISABLED, true);
    public void actionPerformed(ActionEvent ev) {
        //Starting point for designer:
        TopComponent tc = new TopComponent();
    public Action createContextAwareInstance(Lookup actionContext) {
        return new DesignAbstractFormAction(actionContext);
    private static class ScanForObjectTask implements Task<CompilationController&g; {
        private final DesignAbstractFormAction action;
        private ScanForObjectTask(DesignAbstractFormAction action) {
            this.action = action;
        public void run(CompilationController compilationController) throws Exception {
            new MemberVisitor(compilationController, action).scan(
                    compilationController.getCompilationUnit(), null);
    private static class MemberVisitor extends TreePathScanner<Void, Void&g; {
        private CompilationInfo info;
        private final AbstractAction action;
        public MemberVisitor(CompilationInfo info, AbstractAction action) {
            this.info = info;
            this.action = action;
        public Void visitClass(ClassTree t, Void v) {
            Element el = info.getTrees().getElement(getCurrentPath());
            if (el != null) {
                TypeElement element = (TypeElement) el;
                Types typeUtils = info.getTypes();
                while (element!=null&&!element.toString().equals("com.vaadin.ui.CustomComponent")) {
                    element = (TypeElement) typeUtils.asElement(element.getSuperclass());
                    if (element!=null&&element.toString().equals("com.vaadin.ui.CustomComponent")) {
                    } else {
            return null;

NetBeans Zone - The social network for developers - April 04, 2014 03:03 PM
David Salter: My 5 Favorite NetBeans IDE Features!

Following on from Ciprian Turcu, Mark Stephens, Josh Juneau, Preview Text:  Maven, Git, Java EE, and more... find out why David Salter likes NetBeans IDE! Legacy Sponsored:  unsponsored

Geertjan's Blog - April 03, 2014 02:26 PM
YouTube: Vaadin/NetBeans Webinar

The webinar is live on YouTube. Watch how Matti the Vaadin guy deletes almost my entire application and replaces it with Vaadin:

Or click here to get there: https://www.youtube.com/watch?v=3TompuzySD8

Here's a pic of the after party with Matti, my co-presenter:

And the after after party in a viking restaurant with Fredrik, Matti, and Sami:

Adam Bien - April 03, 2014 09:28 AM
GlassFish v4.0.1 Daily Build Supports Java 8 Lambda

GlassFish v4.0 does not support lambdas. If you attempt to deploy a Java EE 7 application with CDI and Lambdas you are going to get the following exception:

Severe:   Exception while visiting WEB-INF/classes/com/airhacks/lambda/test/BackendService.class of size 1825
java.lang.ArrayIndexOutOfBoundsException: 52264
	at org.objectweb.asm.ClassReader.readClass(ClassReader.java:2015)
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:469)
	at org.objectweb.asm.ClassReader.accept(ClassReader.java:425)
	at org.glassfish.hk2.classmodel.reflect.Parser$5.on(Parser.java:362)
	at com.sun.enterprise.v3.server.ReadableArchiveScannerAdapter.handleEntry(ReadableArchiveScannerAdapter.java:165)
	at com.sun.enterprise.v3.server.ReadableArchiveScannerAdapter.onSelectedEntries(ReadableArchiveScannerAdapter.java:127)
	at org.glassfish.hk2.classmodel.reflect.Parser.doJob(Parser.java:347)
	at org.glassfish.hk2.classmodel.reflect.Parser.access$300(Parser.java:67)
	at org.glassfish.hk2.classmodel.reflect.Parser$3.call(Parser.java:306)
	at org.glassfish.hk2.classmodel.reflect.Parser$3.call(Parser.java:295)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
	at java.lang.Thread.run(Thread.java:744)

The following test source was used:

public class BackendService {

    public double average() {
        List<Integer> numbers = new ArrayList<>();
        return numbers.stream().mapToInt(i -> i).average().getAsDouble();


However, GlassFish v4.0.1 nightly builds builds starting with March, 20th 2014 supports Java 8 and lambdas. You can deploy Java EE 7 applications running on Java 8 with lambdas.

See you at Java EE Workshops at MUC Airport!

Real World Java EE Workshops [Airport Munich]>

NetBeans Zone - The social network for developers - April 02, 2014 12:41 PM
Arthur Buliva: My 5 Favorite NetBeans IDE Features!

Following on from Ciprian Turcu, Mark Stephens, Preview Text:  Database support, GlassFish, Git, and more... read what Arthur Buliva from Kenya likes about NetBeans! Legacy Sponsored:  unsponsored

Geertjan's Blog - April 02, 2014 11:57 AM
Sign Up for Tomorrow's Vaadin/NetBeans Webinar!

Click the image above or click here to get to the sign up form!

Adam Bien - April 02, 2014 09:59 AM
Airhacks Q & A and How To Tackle Java EE (7)

Two free (no registration required) streaming, but interactive, events are waiting for you:

  1. Airhacks Questions and Answers: At the first Monday of each month at 6 P.M. CET. (next event is scheduled for: Monday, April, 7th, 6 P.M CET). I'm going to answer all remaining questions about Java (SE/EE/FX/Nashorn) from http://workshops.adam-bien.com, this blog, https://twitter.com/AdamBien and from "the streets" :-). The length of the event directly depends on the question's queue depth.
  2. Virtual Keynote: "How To Tackle Java EE 7" from http://2014.devcrowd.pl/. Abstract:
    You don't have to know the complete Java EE 7 API to create maintainable enterprise applications efficiently. The reverse is true: well designed Java EE applications comprise 95% business logic and only 5% plumbing. In this talk I would like to introduce a business driven approach to maintainable Java EE with lots of code and some slides
You can attend both events without any registration at: http://www.ustream.tv/channel/adambien. Questions can be asked during the event using the built-in chat or twitter with hashtag #airhacks.

See you at Java EE Workshops at MUC Airport or on demand and in a location very near you: airhacks.io!

Real World Java EE Workshops [Airport Munich]>

markiewb's blog - April 01, 2014 10:00 PM
NetBeans: Switching project groups from toolbar

Today I saw that a new version 1.7 of the “Cool Editor Actions” plugin has been uploaded by anchialos to the plugin portal [1]. It introduces switching of project groups and toolbar configurations right from the toolbar, which is very nice.



BTW: A similar much older plugin named “Project Group Toolbar” from Aljoscha Rittner already exists, but  unfortunately it does not work in a stable way anymore – regarding to multiple comments at the plugin portal [2].

[1] http://plugins.netbeans.org/plugin/39634/cool-editor-actions
[2] http://plugins.netbeans.org/plugin/20677/project-group-toolbar