Ben Hale

Ben Hale

San Francisco, CA

Blog posts by Ben Hale

Bundlor 1.0.0.RC1 Available

Engineering | December 23, 2009 | ...

I'm very excited to announce that Bundlor 1.0.0.RC1 is now available. There have been numerous changes to Bundlor since the M6 release including additions to detection and warning criteria as well as improvements to the ANT and Maven configurations.

This milestone marks feature-complete status for the 1.0.0 release. Baring any major issues, this candidate will be released as 1.0.0.RELEASE shortly.

Detection and Warning Criteria

Bundlor now detects Java types in the following locations:

Bundlor also scans the its generated manifest for the following issues and generates warnings based on them:

Standardized and Simplified Configuration

One of the most glaringly bad parts of Bundlor up until the RC1 release was the inconsistency of features and configuration across the various front ends (command-line, ANT, Maven). RC1 has unfortunately had to change the configuration parameters of all of these but the end result is consistency and in many cases simplification of Bundlor's configuration.

Please see the Bundlor documentation for the configuration options for your…

dm Server 2.0.0.M6

Engineering | October 27, 2009 | ...

dm Server 2.0.0.M6 is now available and can be downloaded from here.

This release follows quickly on the M5 release as we close in on the first 2.0.0 release candidate. This time we've focused very heavily on fixing outstanding defects and added just a handful of new features. Take a look at the M6 release notes for the full details of the defects that we've fixed and the features we've added. Please keep your feedback coming as comments on our blog, in the forums, and on the JIRA.

New and Noteworthy

Running dm Kernel and dm Server as a Service

The dm Kernel and dm Server can now be started as a service on windows and UNIX machines. To install the service on windows you need to edit the $HOME/bin/service/conf/wrapper.conf file to properly list the path of the kernel or server. Then you run the $HOME/bin/service/windows.bat install. There are other commands to be run and the dm Server documentation addresses the others.

UNIX users have it even easier as the $HOME/bin/service directory contains a number of init.d compatible…

dm Server 2.0.0.M5

Engineering | October 12, 2009 | ...

dm Server 2.0.0.M5 is now available and can be downloaded from here.

We’re getting towards the end of the 2.0.0 release cycle so most of the work in this milestone is focused on locking down the user interaction model. Take a look at the M5 release notes for the full details of what we’ve been working on. Please keep your feedback coming as comments on our blog, in the forums and on JIRA.

Please also watch the blog for detailed posts on many of the new features referenced in this New and Noteworthy.

New and Noteworthy

Deploying Configuration Files

Properties files can now be deployed in either the pickup directory or in any configured repository. The content of these files is then accessible in OSGi’s ConfigurationAdmin at a PID specified as the file’s name without the .properties extension.

Plan Attributes and Properties

Plans can now have globally defined attributes used for substitution.

	<attribute name="version" value="[1.0.0, 2.0.0)"/>

<artifact type="bundle" name="" version="${version}"/>

Artifacts within plans can have properties defined which are translated into Bundle manifest headers at deployment time.

<artifact type="bundle" name="my.webapp" version="[1.0.0, 2.0.0)">
	<property name="Web-ContextPath" value="/foo"/>

Admin Console

The Artifacts page of the admin console has been spruced up to render the dependencies of user installed artifacts as trees. In addition, each level of these trees is lazily loaded improving load-time performance.

Admin Console

Command-line Shell

dm Server now ships with a command line shell to replace the Equinox console that was previously used. This console is accessible locally with the -shell startup command.

$ bin/ -shell
<KE0001I> Kernel starting.
<KE0002I> Kernel started.
<SH0001I> dm Kernel ssh shell available on port 2402.

     @@@ ***
    @@@ *****            .__.                  .__.            .__.  .__.
   @@@@ ******         __|  |  _____     _____.|  |__    ___…

Bundlor Adds Support for the Blueprint Service

Engineering | September 26, 2009 | ...

I'm pleased to announce that beginning with its newly released 1.0.0.M6 version, Bundlor now supports OSGi Blueprint Service files.

As with the support for Spring-DM contexts, Bundlor scans for Blueprint Service configuration files in both the default location (OSGI-INF/blueprint/*.xml) and in locations specified with the custom Bundle-Blueprint manifest header. When these files are found, they are scanned for class and interface names and the packages for those types are added to the OSGi manifest that Bundlor creates.

For information about Bundlor and to download this latest milestone, please visit the Bundlor project page

Slices Menu Bar Screencast

Engineering | August 07, 2009 | ...

I'm pleased to announce a new screencast for SpringSource Slices. This screencast walks through the creation of the menu-bar sample application. It shows how a host can use a collection of slices to populate a menu bar dynamically without restarting and can be completely de-coupled from the knowledge of exactly what items might be in the menu-bar. In addition, the slices only provide their specific content, and include formatting and other window content from the host bundle.

Slice Menu Bar (5:19)

Source Code

Git Migration

Engineering | July 15, 2009 | ...

Some of you may have noticed that in recent posts that the dm Server team has been referencing Git repository URLs. The team has been migrating all of its source code and I'm now pleased to announce that this migration is done. The list below contains the Git URLs for the code managed by the dm Server team. If you were referencing the equivalent repositories in SVN, please clone these new repos instead.

This announcement only covers code managed by the dm Server team, and not the entirety of the Spring portfolio. Other projects will be converting at their own pace and the Subversion…

Maven PAR Plugin 1.0.0.M1

Engineering | June 24, 2009 | ...

Shortly after the introduction of SpringSource dm Server (Application Platform at the time), Thorsten Maus created a Maven plugin for creating PAR files. This was a great community contribution and we even used it in the Getting Started Guide for dm Server 1.0.x.

As dm Server's 2.0 milestones have progressed we've been adding new functionality to the PAR file. The most interesting feature is that now a PAR file can contain more than just JAR files. With the introduction of OSGi RFC 66, the dm Server has deprecated Web Modules in favor of the standard Web Container files using a .war

OSGi Test Stubs 1.0.0.M1

Engineering | June 23, 2009 | ...

I'm pleased to announce the 1.0.0.M1 release of SpringSource's OSGi Test Stubs.  These stubs offer a way to unit test complex OSGi Framework interactions without needing a full OSGi container.

The Problem

As the dm Server team has been developing, we found that one of the biggest problem areas for testing for us was in BundleActivators.  Our BundleActivators do quite a bit of publishing services to the service registry as well as consuming services using ServiceTrackers.  These kinds of tasks involve many interwoven calls to BundleContexts, Bundles, ServiceRegistrations, and ServiceReferences.  In the beginning, these activators were simple enough that not much unit testing was done on them, and we depended on integration tests to catch any bugs that were introduced.  As time went on though, the activators became more complex and unit testing became a more pressing need.  We started using EasyMock for these tests, but found that they were very complex, hard to maintain, and most importantly hard to understand.
public void startAndStop() throws Exception {
    BundleActivator bundleActivator = new DumpBundleActivator();
    BundleContext context = createMock(BundleContext.class);
    Filter filter = createMock(Filter.class);
    String filterString = "(objectClass=" + DumpContributor.class.getName() + ")";

dm Server Repository Content via JMX

Engineering | June 22, 2009 | ...

In the dm Server 2.0.0.M1 release we added support for shared repositories. As a followup to this new functionality, we've added support for browsing those repositories via JMX.

Connecting to a running dm Server instance with a JMX client now shows you a Repository group. Under this group, each configured repository (with the exception of chained repositories) has a bean that returns synopses of all of the artifacts contained inside. The bean also exposes a method for returning the entire, detailed ArtifactDescriptor for a given bean based on it's type, name, and version.

JMX Repository Browsing

Obviously, something like JConsole is mostly useful for displaying small targeted amounts of data.  For larger datasets, the AMS team is currently working on visualization that is a bit easier on the eyes.

Using an OSGi Profile with Bundlor

Engineering | May 18, 2009 | ...

When managing and transforming as many bundles as are included in the the SpringSource Enterprise Bundle Repository, it becomes very difficult to remember what packages are boot delegated, exported from the system bundle, or from other bundles in your system. This information is important because you probably don't want to import packages that are boot delegated, you probably do want to import system bundle packages at "0", and you want to define custom imports for all others. Remembering which packages are in each of these categories ends up being a bit error prone and defining template…

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