Well, definitely make it available somehow so people can take a look at it.
-> richard
On 10/1/09 12:26, Jeremias Maerki wrote:
Just in case anyone is interested: I've written a little bundle to work
around that problem and to get Apache FOP and Batik working in an OSGi
environment. The Apache XML Graphics project makes heavy use of the
META-INF/services mechanism for plug-ins.
My bundle provides code to transparently provide plug-in classes, be
that in an OSGi environment or in a plain Java environment. And it works
for Java>= 1.4 (i.e. doesn't use ServiceLoader). It seems to work quite
nicely for me so far, but I haven't taken the time to clean up
everything and publish it. And I'm using my own Ant-based
Bundle-Manifest creator (i.e. not BND) which is equally unpublished. But
if there's interest, I could do that work and publish it (be that on my
own website, as part of Apache XML Graphics or Apache Felix) in the next
few weeks (when my immediate deadlines are past).
Here's how some client code would look like:
Services services = Services.getInstance();
//Dynamic registration of ImagePreloaders
Iterator iter =
services.getServiceProvider(ImagePreloader.class).getServiceFactories();
while (iter.hasNext()) {
ServiceFactory factory = (ServiceFactory)iter.next();
registerPreloader((ImagePreloader)factory.createInstance());
}
Sorry, no generics, since I have to support Java 1.4 for the time being.
On 01.10.2009 11:48:16 Richard S. Hall wrote:
Did this issue ever get resolved?
As far as I can see, you are trying to find a service provider from the
SPI bundle, but the SPI bundle doesn't have any visibility to the
service provider, so it cannot find it. You cannot use ServiceLoader in
the normal way in OSGi.
-> richard
On 5/18/09 22:04, Moloney, Tim M wrote:
I've attached my example project. To build it just run 'mvn install'.
To run it from the command line, run 'RunFooFromOsgi'. To run it within
Eclipse, import the project, then run fooOsgi. RunFooFromMain (command
line) and fooMain (Eclipse) run the example service provider
successfully outside of Felix.
If I run my example code from the command line (RunFooFromOsgi), no
service providers are found.
If I run my example code from within Eclipse, I get the following:
Welcome to Felix.
=================
-> In com.example.foo.osgi.Activator.start():
ERROR: Error starting file:target/com.example.foo.osgi-0.1.0.jar
(org.osgi.framework.BundleException: Activator start error in bundle
com.example.foo.osgi [5].)
java.util.ServiceConfigurationError: com.example.foo.spi.Foo: Provider
com.example.foo.impl.FooImpl could not be instantiated:
java.lang.ClassCastException
at java.util.ServiceLoader.fail(ServiceLoader.java:207)
at java.util.ServiceLoader.access$100(ServiceLoader.java:164)
at
java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:353)
at java.util.ServiceLoader$1.next(ServiceLoader.java:421)
at com.example.foo.spi.FooFactory.getFoo(FooFactory.java:17)
at com.example.foo.osgi.Activator.start(Activator.java:17)
at
org.apache.felix.framework.util.SecureAction.startActivator(SecureAction
.java:589)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1458)
at
org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:984)
at
org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:263)
at java.lang.Thread.run(Thread.java:619)
Caused by: java.lang.ClassCastException
at java.lang.Class.cast(Class.java:2990)
at
java.util.ServiceLoader$LazyIterator.next(ServiceLoader.java:345)
... 8 more
Tim Moloney The reasonable man adapts himself
to
ManTech Real-time Systems Laboratory the world; the unreasonable one
persists
2015 Cattlemen Road in trying to adapt the world to
himself.
Sarasota, FL 34232 Therefore all progress depends on
the
(941) 377-6775 x208 unreasonable man. - George
Bernard Shaw
-----Original Message-----
From: Richard S. Hall [mailto:he...@ungoverned.org]
Sent: Monday, May 18, 2009 10:11
To: users@felix.apache.org
Subject: Re: ServiceLoader and OSGi?
On 5/18/09 9:31 AM, Moloney, Tim M wrote:
I have a very simple service provider that works outside of OSGi.
I tried using it in Felix but it fails with a ClassCastException.
Is this somehow related to the different class loaders in
the different
bundles?
Probably.
Any suggestions on how to get past this?
Not enough information to say.
-> richard
Thanks.
Tim Moloney The reasonable man adapts himself to
MRSL the world; the unreasonable one persists
2015 Cattlemen Road in trying to adapt the world to himself.
Sarasota, FL 34232 Therefore all progress depends on the
(941) 377-6775 x208 unreasonable man. George Bernard Shaw
Jeremias Maerki
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