Griffon 0.9.2 – "Aquila pomarina" - is a maintenance release of Griffon 0.9.

Griffon Team

During the development time frame of 0.9.2 the team grew by two new members

New Features

Griffon build

The Griffon build has moved from Ant to Gradle with increased boost in build time and reduced setup.


IDE Integration

The integration files for Eclipse and IDEA have been updated to conform to their latest conventions.


Plugin dependencies declared using the Dependency DSL should be fully honored now.
The DependencyReport script will now skip configurations that may not available (i.e, such as provided)

Plugin CLI sources

Plugins can now build and package sources that should be excluded form runtime. Just place the sources under src/cli and the build will do the rest. Adding the package classes to the build via the dependency DSL is as easy as pasting the following snippet in the plugin's _Events.groovy script

def eventClosure1 = binding.variables.containsKey('eventSetClasspath') ? eventSetClasspath : {cl->}
eventSetClasspath = { cl ->
    if(compilingPlugin('quartz')) return
    griffonSettings.dependencyManager.flatDirResolver name: 'griffon-quartz-plugin', dirs: "${quartzPluginDir}/addon"
    griffonSettings.dependencyManager.addPluginDependency('quartz', [
        conf: 'compile',
        name: 'griffon-quartz-addon',
        group: 'org.codehaus.griffon.plugins',
        version: quartzPluginVersion
    griffonSettings.dependencyManager.addPluginDependency('quartz', [
        conf: 'build',
        name: 'griffon-quartz-cli',
        group: 'org.codehaus.griffon.plugins',
        version: quartzPluginVersion

Substitute 'quartz' for your plugin name. This feature is available to plugins that also package an addon descriptor.

Install plugin updates in batch mode

A couple of releases ago Griffon added a command to list all available plugin updates from currently installed plugins however you were still tasked with updating every single plugin individually. Now you can update all plugins in one step by invoking the list-plugins-update command with an additional flag

griffon list-plugins-updates -install

Override template selection

Every create-* command relies on templates in order to generate their target files. Each template matches a naming convention which can be used to your advantage. For example overriding the default template for a view when creating a new MVC groups can be done by calling

griffon create-mvc -view=CustomView

The command will search for templates in the following locations

The convention is simple, define a flag whose name matches the type of portion you want to override, i.e, -view matches View, -service matches Service and so on. This works with any supported file type (like Groovy and Java).

Configuration flags

All of the command options described in section 4.6 Command Line Options of the Griffon Guide can now be specified in griffon-app/conf/BuildConfig.groovy or $USER_HOME/.griffon/settings.groovy.


The logging DSL for execution during runtime is available during buildtime too. You can configure it by editing either griffon-app/conf/BuildConfig.groovy or $USER_HOME/.griffon/settings.groovy and placing a log4j section.


Logging DSL

Griffon 0.9.2 has ported over the Log4j DSL found in Grails 1.3.x. You can now configure logging pretty much in the same way. Here's an example of how a typical setup will look like (in griffon-app/conf/Config.groovy

log4j = {
    error  'org.codehaus.griffon',  //  internals

    warn   'griffon.util',

The Griffon Guide contains further information on how to use the DSL.

WindowManager DSL

Starting with Griffon 0.9.2 there's a new DSL for configuring show/hide behavior per window. This configuration can be set in griffon-app/conf/Config.groovy, and here is how it looks

swing {
    windowManager {
        myWindowName = [
            show: {window, app -> ... },
            hide: {window, app -> ... }
        myOtherWindowName = [
            show: {window, app -> ... }

The name of each entry must match the value of the Window's name: property. Each entry may have the following options

The first two options have priority over the third one. If one is missing then the WindowManager will invoke the default behavior. There is one last option that can be used to override the default behavior provided to all windows

swing {
    windowManager {
        defaultHandler = new MyCustomWindowDisplayHandler()

Previous to Griffon 0.9.2 the first window to be displayed during the Ready phase was determined by a simple algorithm: picking the first available window from the managed windows list. With 0.9.2 however, it's now possible to configure this behavior by means of the WindowManager DSL. Simply specify a value for swing.windowManager.startingWindow, like this

swing {
    windowManager {
        startingWindow = 'primary'

This configuration flag accepts two types of values:

If no match is found then the default behavior will be executed.

Conditional logging

The latest Groovy beta release (1.8b3) includes a new AST transformation (@Log) that can inject a Logger instance (if not present already) and transforms all logging calls to be conditionally guarded. This means that a simple logging statement as

log.info "Elmer Fudd hunts $wabbits"

is transformed into

if(log.infoEnabled) log.info "Elmer Fudd hunts $wabbits"

While Griffon 0.9.2 still depends on Groovy 1.7.6 (which doesn't provide access to @Log) it however, does inject conditional logging on all logger instances belonging to Griffon artifacts, that is: controllers, models, views, services, and any additional artifacts added by plugins.


There's a new helper class (griffon.core.AddonManager) that will keep track of installed Addons. Each addon now has an associated descriptor of type griffon.core.GriffonAddonDescriptor that can helps an application figure out more about addon contributions at runtime.

Services as Application Event Handlers

You might be aware that Griffon automatically manages services instances (with or without installing the Spring plugin). Each service is treated as a singleton, which made it a bit difficult to configure services as application event listeners. Starting with this release services instances will become application event listeners by default, same as controllers. Also, all available service instances can be accessed from the application instance using the getServices() method/property. Be warned that services are still instantiated on demand so you won't be able to query all services instances at a given time if not all of them have been instantiated already.

Threading AST Transformation

There's a new AST transformation that can be used to inject proper threading management used to execute code outside/inside the UI thread. Refer to section 9.3 Annotation Based Threading of the Griffon Guide.

Automatic threading management in Controllers

It's been known since the beginning of Swing that executing a long operation inside the EDT is a bad practice and should be avoided. Sadly there is no compile time support for checking for violations of this rule. However starting with this release all controller actions are guaranteed to be executed outside of the EDT. This feature can configured/disabled in several ways

1. Specify griffon.disable.threading.injection=true during the compilation process

griffon -Dgriffon.disable.threading.injection=true compile

2. Alternatively specify griffon.disable.threading.injection=true in either griffon-app/conf/BuildConfig.groovy or $USER_HOME/.griffon/settings.groovy.

3. Follow the instructions found in section 8.1.1 Threads and Actions of the Griffon Guide.

4. Or annotate the action property/method with @Threading(Threading.Policy.SKIP)

This feature complements the @Threading AST transformation, which means it will honor any settings you specify if an action is annotated with @Threading. A controller action is considered to be

Publish events in asynchronous mode

There are now 3 ways for publishing an event

Uncaught exception management

The Griffon runtime will now handle all uncaught exceptions and trigger application events following a naming convention. This way any listener can react to an exception being thrown. Consult section 5.5.10 of the Guide to know more about this feature. In short, if an IllegalArgumentException is thrown and not caught then a listener can handle by registering the following handler

   def onUncaughtIllegalArgumentException = { iae -> ... }

There's also a generic catch all event

   def onUncaghtExceptionThrown = { e -> ... }

Xml externalized Views

Building a Java View might not be so fun as building its Groovy counterpart (thanks to the builder DSL). However you can use an XML definition that closely resembles the builder format but uses XML instead of Groovy. this option is meant for developers that do not want to use Groovy source code in any way. Consult section 13.3 of the guide, specifically subsection 13.3.3 to know more about this feature.

Creating bindings in Java

Continuing with Java specific features, bindings are another missing aspect of the Swing library. Fear not as the new griffon.util.BindUtils exposes SwingBuilder's bindings throw a fluent interface design. Here's an example of it


You can use this feature from Groovy code too, as long as you provide an instance of a builder that can handle the bind() node.

Breaking changes

Moved Classes

Changed Classes

New classes

Dependency Management

Plugins built with Griffon 0.9.2 and upwards should declare all of its dependencies using the Dependency DSL found in griffon-app/conf/BuildConfig.groovy, including those that are located in the lib directory. For the latter case, you must declare a resolver that is local to the plugin, like this

griffon.project.dependency.resolution = {
    inherits "global"
    log "warn"
    repositories {
        flatDir name: 'slickPluginLib', dirs: 'lib'
    dependencies {
        compile 'org.newdawn:slick:274',

Buildtime Dependencies

The jar org.springframework.test is no longer provided for the test configuration.

Runtime Behavior

Automatic threading management for controller actions is a very desirable feature but it breaks compatibility with previous releases. You can disable this feature in many ways if it proves to be problematic during transition. Please review all methods and closure properties found in your controllers. Any candidate that follows the rules for actions will be automatically transformed.

Changes in the event publishing mechanism means that calling eventAsync() will not work as before. Every call to eventAsync() must be substituted with eventOutside()

Previous releases in this series

Griffon 0.9.2-beta-1
Griffon 0.9.2-beta-2
Griffon 0.9.2-beta-3
Griffon 0.9.2-rc1

Sample Applications

Griffon 0.9.2 ships with 5 sample applications of varying levels of complexity demonstrating various parts of the framework. In order of complexity they are:

File Viewer

File Viewer is a simple demonstration of creating new MVCGroups on the fly.

Source: samples/FileViewer

To run the sample from source, change into the source directory and run griffon run-app from the command prompt.


GroovyEdit is an improved version of FileViewer that uses custom observable models.

Source: samples/GroovyEdit

To run the sample from source, change into the source directory and run griffon run-app from the command prompt.

Font Picker

Font Picker demonstrates form based data binding to adjust the sample rendering of system fonts.

Source: samples/FontPicker

To run the sample from source, change into the source directory and run griffon run-app from the command prompt.


Greet, a full featured Griffon Application, is a Twitter client. It shows Joint Java/Groovy compilation, richer MVCGroup interactions, and network service based data delivery.

Source: samples/Greet

To run the sample from source, change into the source directory and run griffon run-webstart from the command prompt. Because Greet uses JNLP APIs for browser integration using run-app will prevent web links from working.


SwingPad, a full featured Griffon Application, is a scripting console for rendering Groovy SwingBuilder views.

Source: samples/SwingPad

To run the sample from source, change into the source directory and run griffon run-app from the command prompt.

0.9.2 Release Notes

0.9.2-rc1 Release Notes

0.9.2-beta-3 Release Notes

0.9.2-beta-2 Release Notes

0.9.2-beta-1 Release Notes