Spring OSGi classpath resource issue

Question

I'm trying to deploy a spring based bundle in osgi (fuse esb).In spring context, I'm referring to a db4o file which is inside resources folder. As per my understanding, a maven project will make sure that any file available under resources folder will be available in project classpath. I've kept the file under resources/META-INF/spring/repo/test.db4o.

Here's the entry in spring context.

<bean id="objectContainer" class="org.springmodules.db4o.ObjectContainerFactoryBean">
    <property name="databaseFile" value="classpath:META-INF/spring/repo/test.db4o" />
</bean>

Once I install and try to start the application, I'm getting the following exception.

java.io.FileNotFoundException: OSGi resource[classpath:META-INF/spring/repo/test.db4o|bnd.id=258|bnd.sym=taxonomydaoimplbundle] cannot be resolved to absolute file path because it does not reside in the file system: bundle://258.0:1/META-INF/spring/repo/test.db4o

I've tried different combinations, but OSGi doesn't seem to recognize this file. Any pointer will be appreciated.

-Thanks

Answer 1

I found the issue finally. ObjectContainerFactoryBean is relying on OSGiResourceBundle to load the resource as a file object. Though OSGiResourceBundle exposes a method called getFile(), it doesn't work as intended in an OSGi environment. It always expects a file protocol whereas the resource returned as an URI has a protocol "bundle".Hence, the exception is being thrown. The workaround is to use a inputstream or getUrl. Since I didn't have the source code of ObjectContainerFactoryBean, I had to extend this class to provide my own implementation which loads the file as an inputstream.