Representation of the
HTML Geo API for Java provides annotation based way of obtaining geolocation information from a browser or any other device capable of providing it.
Interfaces for integrators of various execution environments.Not really interesting for clients.
Service provider classes to build
Service provider interfaces for those willing to
Service Provider Interfaces for those who wish to integrate own technology with the HTML for Java API.
Entry point to the test compatibility kit.
Every browser widget Java API offers ways for communication between Java and
writes different code when communicating with
different one when communicating with
yet another one when talking to
The goal of HTML/Java API is to unify this communication. By providing simple
and highly portable
basic building blocks
one can create sophisticated APIs (like
that can be embedded into
Swing or JavaFX applications,
headlessly on a server
or executed anywhere HTML/Java API was ported.
high level bindingsto control your UI with a Model-view-viewmodel paradigm - see classical TODO example.
RESTor WebSockets to simplify network communication from a browser.
The HTML/Java API offers you unified access to
full featured Java runtime (like real HotSpot VM) and
very lightweight rendering technology (so it can potentially fit
Bck2Brwsr and definitely
to various types of phones - e.g.
What can be more lightweight (from a browser perspective) than
HTML!? Speed up your development with
component to display the HTML, get browser inspect features,
CSS navigation and IDE integration.
The project has been donated to Apache Foundation and the code is now hosted in the incubator repository along other Apache incubating projects. Contribute to the project by forking its GitHub repository.
Using Android JSON
parsing library as it is Apache licensed -
It is acceptable to read properties of a model when
computing a property.
Regular subclassing of
- better garbage collector related behavior of ko4j instances thanks
to introduction of
license in the ko4j artifact - bug
Simplifying dependencies of
org.netbeans.html.json.tck - bug
Bug fix for
multiple observers on a single model object.
GC behavior specified in TCK and used in Knockout for Java implementation.
Removing dependency on Java collection classes implementations.
Models.asList(T...) factory method to
a create simple list implementation.
KnockoutTCK to avoid
undefinedare treated as null. Better behavior under multi-threaded load. Workaround for garbage collector behavior of modern JavaFX WebView implementations (JDK8 u112 and newer). JavaFX Presenter can show popup window. Development has switched to Git repository thanks to conversion by Emilian Bold. Better support for obfuscation of knockout module (bug 270013).
Model classescan have
per-instance private data.
Model classescan generate builder-like construction methods if builder
-Dfxpresenter.headless=truewhen launching its virtual machine and no window will be shown. This is particularly useful for testing. Configure your surefire or failsafe plugins like:
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-surefire-plugin</artifactId> <version>2.13</version> <configuration> <systemPropertyVariables> <fxpresenter.headless>true</fxpresenter.headless> </systemPropertyVariables> </configuration> </plugin>OSGi headers are now enterprise OSGi ready. Switched to minified version 3.4.0 of knockout.js. Better support for recursive @Model definitions. New module
org.netbeans.html:xhr4jprovides implementation of
technology identifierxhr4j - this module can be used to workaround limitations of CORS by handling the
OnReceiveconnections in Java.
One can control
HTTP request headers
when connecting to server using the
annotation. It is possible to have
writable computed properties.
There is an easy way to enable Firebug in
the JavaFX based Web View -
just run with
Bugfix of issues 250503,
The content of a
can be selected by registering implementations under specific
and requesting them during
of the context.
org.netbeans.html:ko4j module's implementation
offers ko4j, xhr and websocket identifiers
for its registered services
module registers its
Java based JSON and
under the name tyrus.
A particular DOM subtree
that a knockout.js model gets
applied to can be selected by using
Models.applyBindings(m, id) with an id of an HTML element.
There is new
which controls behavior of the generated
If specified and non-empty, then the generated method
this and the provided
If specified, but left empty, then the generated method
If unspecified, the method will not be generated at all
(a change with respect to older versions). However one can
to perform the association of any model with the page element.
Memory model when using Knockout bindings has been improved
(required additions of two new methods:
now the Java
models can garbage collect,
when no longer used. Library writers that use
control garbage collection behavior of method arguments by
Array properties are now
mutable from the knockout.js
point of view (required
one SPI change).
The page lookup mechanism can use
to load localized a page with appropriate suffix.
All SPI were moved under the NetBeans namespace - e.g.
org.netbeans.html.sound.spi, and also
org.netbeans.html.json.tck. Methods annotated
without fallback Java code now throw
with a message suggesting to switch to proper
browser context to
prevent endless debugging when one forgets to do so.
System can run in
Felix OSGi container (originally only Equinox).
now deeply check changes in other
classes they depend on and recompute their values accordingly.
Knockout.js library has been updated
to version 3.2.0.
Setters or array properties on classes generated by
annotation can be accessed from any thread.
can be registered into
BrwsrCtx. There is
to parse a JSON array and convert it into
Improved behavior of
enum values in
Few bugfixes for better portability.
New API for
on top of Nashorn - does not run knockout for Java
(reported as JDK-8046013),
however even in current state it is quite
useful for testing
FXBrowsers has been extended
with new helper methods to make it easier to use HTML+Java
API in existing JavaFX applications.
The annotation processor is made
more robust with respect to errors in callback syntax of
has been improved based on a failure of its usability study.
There can be additional parameters to methods annotated by
OnReceive that allows one to
pass state when a JSON call is made and use it when it finishes.
The mechanism of discovery of sibling HTML page has been
extended to work on systems that don't support
asynchronous execution. Libraries using
new attribute as much as possible, as it can speed up execution
in certain environments.
Learn how to
animate an HTML page from Java
without referencing single HTML element from the Java code.
JSON to communicate
with REST based server API.
Use WebSockets and JSON.
$ mvn archetype:generate \ -DarchetypeGroupId=com.dukescript.archetype \ -DarchetypeArtifactId=knockout4j-archetype \ -DarchetypeVersion=0.16 # or newer version, if availableAnswer few questions (for example choose myfirstbrwsrpage as artifactId) and then you can:
The application is rendered in a
web view component (that of course requires your JDK to come
and JDK8 from Oracle contain everything that is needed).
The generated application is built around one
Java source (uses the
Model annotation to
Data.java class during compilation)
and one HTML file (uses the Knockout
data-bind the HTML elements to the
$ ls client/src/main/java/**/DataModel.java $ ls client/src/main/webapp/pages/index.htmlThat is all you need to get started. Play with the sources, modify them and enjoy Html for Java!
This API is part of NetBeans.org project and as such it works naturally with the NetBeans IDE. On the other hand, the API is using nothing NetBeans specific, it builds on standard Java6 APIs and as such it shall work fine in any IDE.
A lot of work is done by annotation processors that generate various boiler plate code during compilation. This is a standard part of Java since JDK6, but for example Eclipse is known not to deal with processors well and developers using it need to be careful. IntelliJ users hasn't reported any issues and of course, NetBeans IDE support for processors is outstanding.
useful to do a bit of post processing of classes. There is a
plugin for that.
NetBeans IDE will invoke it when doing a build. Other IDEs may
need some hint to do so.
Anyway: If one does not see all (generated) sources or is getting
LinkageErrors when executing the application,
switch to command line and do clean build
$ mvn clean install
It is not goal of this documentation to list all possible ways to package and deploy applications which use this API. However it is important for new comers to see the benefits of using the HTML for Java API and as such let's list at least few bundling options, known to work at the time of writing this documentation.
First of all, this is a client technology. You write client applications with it which may, but need not connect to a server. You don't need Tomcat or WebLogic to deploy HTML for Java applications.
The sample project generated by
org.apidesign.html knockout4j-archetype is configured
to use JavaFX
as the rendering technology. This setup is primarily suitable for
development - it needs no special packaging, starts quickly and
allows you to use classical HotSpot VM debuggers. A final
artifact from the build is also a ZIP file which you can use
and distribute to your users. Good for desktop applications.
All the HTML for Java libraries are packaged as OSGi bundles and as such they can easily be run in NetBeans as well as in Eclipse. As a result one can use OSGi and have a common module system for both platforms. In addition to that one can render using HTML and have a common UI in both platforms. In such case your application would be packaged as a set of OSGi bundles. Read more...
There is more and more attempts to execute Java bytecode
in a browser, without any special Java plugin installed.
The HTML for Java is
carefully designed to produce lightweight, well performing
applications even on such restricted environments. It uses
no reflection calls and that allows to statically pre-compile
is called Bck2Brwsr,
another TeaVM. Both support the
more or play
a minesweeper game packaged for your browser
(of course written in Java):
Now when we have seen that the HTML for Java applications can run on any modern browser, we can ask whether they can also fit into a phone!? Yes, they can and especially to phones that can execute Java code already! Just by changing your packaging you can create an APK file and deploy it to your Android phone. Read more or install Fair Minesweeper for Android...
In case you'd like your application to reach out to second biggest group of smartphone users, don't despair: It seems the set of devices that can execute HTML for Java applications has been extended to iPads and iPhones. Get the details here and play Fair Minesweeper on iOS!
Convinced it makes sense to use
HTML for Java
APIs for writing applications that are
written once, displayed anywhere? Or do you have an
environment which is not supported? In such case you can bring
HTML for Java
to your environment yourself. Just implement your own
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