Today we're happy to announce the release of Errai 4.0.0.Beta2. This release includes lots of little fixes and enhancements including:
- The EmbeddedWildflyLauncher for Super Dev Mode has been upgraded to use WildFly 10
- Errai Navigation has new annotations for linking native anchors to Errai Navigation pages
- Improved code-generation performance
- Better support for declarative data-binding to native DOM elements
- An injectable ManagedInstance
for dynamically creating bean instances that manages the instances' life-cycles
Below we'll explain what some of these changes mean before talking about next steps.
WildFly 10 Upgrade
The EmbeddedWildflyLauncher now support WidFly 10+. Because of API changes in WildFly, it was not possible to maintain backwards compatibility with WildFly 8. That means that you have two options when upgrading Errai to 4.0.0.Beta2.
Upgrading to WildFly 10 (Recommended)
If you use the same WildFly configuration shown in the Errai Tutorial then you need only upgrade the
as.version
property to 10.0.0.Final
. If you have any other configuration, just make sure that the errai.jboss.home
system property in your Super Dev Mode configuration points to the root of a WildFly 10 installation.Don't Upgrade errai-cdi-jboss
If you can't migrate to WildFly 10 right away, you can use an older version of
errai-cdi-jboss
(which contains the launcher) while still using the newest beta release for all other Errai jars.Errai Navigation Links with Native Anchors
Errai Navigation has two new annotations that you can use on native Anchors for linking to Errai Navigation pages:
These annotations are meant to replace the widget-based
The first anchor links directly to the
org.jboss.errai.ui.nav.client.local.api.TransitionTo
org.jboss.errai.ui.nav.client.local.api.TransitionToRole
These annotations are meant to replace the widget-based
TransitionAnchor
. Below we show them used in an Errai UI templated bean.The first anchor links directly to the
FAQPage
while the second links to the page with the DefaultPage
role. As with the previous transition anchors, Anchors with TransitionTo
or TransitionToRole
are validated at compile-time.Better Data-Binding Support for Native DOM Elements
There were two issues with declarative data-binding of native elements in Errai 4.0.0.Beta1:
@Bound
on a native element would fail in some cases for beans that were not@Templated
@Bound(onKeyUp=true)
on an input element (TextInput
,NumberInput
, etc.) was not supported (and would cause compilation errors)
Both of these issues are fixed in 4.0.0.Beta2, moving Errai two small steps closer to the goal of GWT widget-free UI development.
Creating Beans Dynamically with Managed Life-Cycles
Errai supports CDI's
Instance<T>
for dynamically creating bean instances, but this API has some practical issues:- An instance created by an
Instance<T>
is managed by the caller. The caller is responsible for destroying the bean, which can lead to memory leaks. - Calling
destroy
on anInstance<T>
destroys a bean regardless of its scope. But usually it is only desirable to destroy@Dependent
beans, since@ApplicationScoped
beans tend to be used throughout the entire runtime of an application.
Errai 4.0.0.Beta2 includes a new ManagedInstance<T> interface with similar methods but slightly different semantics that aim to simplify dynamic bean creation:
- The
destroy
method onManagedInstance<T>
destroys@Dependent
instances and is a no-op for all other scopes. ManagedInstance<T>
has adestroyAll
method that destroys all@Dependent
instances created by it.- When a
ManagedInstance<T>
is destroyed, itsdestroyAll
method is called. AManagedInstance<T>
is destroyed when the bean it is injected into is destroyed.
In case the significance of that last point isn't immediately clear, this means that every dynamically created
@Dependent
instance from ManagedInstance<T>
is cleaned-up when the type that injected that ManagedInstance<T>
is destroyed. This avoids memory leaks and boiler-plate in short-lived components that create dynamic instances (like lists of UI elements).Next Steps
In the coming weeks here are some of the features and tasks we will be working on:
- Support for a new scope bound to Errai Navigation
@Page
life-cycles - Thin DOM wrappers for browser events supported by Errai UI
@EventHandler
- Configurable strategy for merging
@DataField
element attributes - Testing with the newest GWT 2.8 snapshots and releases
In the interim, please try out Errai 4.0.0.Beta2 and tell us what you think.
Happy coding!
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