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Retrieving a Bundle Classpath [message #753470]

Thu, 27 October 2011 12:14

Tony Day

Messages: 9
Registered: October 2011

Junior Member

Hi,

Is there a way to retrieve the running bundles classpath? Or any straightforward way to find this out? I know that the ClassLoader is a KernelBundleClassLoader, but this does not seem to provide methods for accessing the classpath string/array.

The reason I ask is for diagnostic purposes. Virgo is telling me something could not be found on the classpath although it is being imported.

Thanks

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Re: Retrieving a Bundle Classpath [message #753485 is a reply to message #753470]

Thu, 27 October 2011 12:53

Glyn Normington

Messages: 1222
Registered: July 2009

Senior Member

There is no simple representation of what you refer to as a class path in a bundle class loader. It's a combination of a local bundle class path and delegation routes, or "wires", to other bundle class loaders.

Have you tried the extremely useful class loading commands (clload, clhas, etc.) provided in the Virgo admin shell? See the user guide for details.

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Re: Retrieving a Bundle Classpath [message #753486 is a reply to message #753485]

Thu, 27 October 2011 12:53

Glyn Normington

Messages: 1222
Registered: July 2009

Senior Member

See also the FAQ.

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Re: Retrieving a Bundle Classpath [message #753489 is a reply to message #753486]

Thu, 27 October 2011 13:15

Tony Day

Messages: 9
Registered: October 2011

Junior Member

Hi Glyn,

Thanks for your advice!

I have used these commands, they really are helpful. Hence why I'm stuck.

Basically I'm having an issue where my bundle cannot find CGLIB at runtime (although it is imported successfully) which is also shown using clload, clhas, clexport as expected. Although I'm still getting the following error:

AG0000E Application context creation failure for bundle 'com.acme.osgi.hibernate-session' version '1.0.0.SNAPSHOT'. org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.osgi.service.exporter.support.OsgiServiceFactoryBean#0': Invocation of init method failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dynamicConfiguration' defined in BeanDefinition defined in URL [bundleentry://153.fwk32113234/META-INF/spring/bundle-context.xml]: Initialization of bean failed; nested exception is org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.

With the interesting part being:

org.springframework.aop.framework.AopConfigException: Cannot proxy target class because CGLIB2 is not available. Add CGLIB to the class path or specify proxy interfaces.

My proxy is simply:

<bean id="dynamicConfiguration"
	class="com.notehive.osgi.hibernate_samples.session.DynamicConfiguration"
	depends-on="databaseLauncher">
	<!-- 
		Need to create a proxy because of, I guess, some mysterious circular
		dependency which requires this bean to exist before it can be initialized. 
	-->
	[b]<aop:scoped-proxy/>[/b]
	<property name="hibernateProperties" ref="hibernateProperties" />
</bean>

NOTE: I've been using code originally developed by Hans Loe, though added Hibernate 3.6.7 and other dependencies. OsgiHibernateSpringSpringDMSample This works fine in Equinox alone.

The following packages relevant to CGLIB 2.2.0 are being exported from one bundle, and imported into my current bundle (this resolves without problem):

org.objectweb.asm;version="3.1.0"
org.objectweb.asm.signature;version="3.1.0"
net.sf.cglib.core;version="2.2.0"
net.sf.cglib.reflect;version="2.2.0"
net.sf.cglib.proxy;version="2.2.0"

I hope you can shed a light on why my bundle cannot find CGLIB.

Thanks

[Updated on: Thu, 27 October 2011 13:19]

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Re: Retrieving a Bundle Classpath [message #753499 is a reply to message #753489]

Thu, 27 October 2011 13:46

Tony Day

Messages: 9
Registered: October 2011

Junior Member

I've found a work-around.

Harald Wellman covers this in his blog:

Quote:

I had a very mysterious ClassNotFoundException when accessing some of my model classes. As it turned out, the reason was my usage of lazy loading, where Hibernate injects CGLIB proxy classes into my model classes. The exception was due to the fact that my model bundle did not have access to the CGLIB classes. Rather than declaring a dependency on CGLIB for each of my model bundles, I added the following header to my Hibernate manifest:

Require-Bundle: com.springsource.net.sf.cglib;visibility:=reexport

So I've now done this and gone on to my next error ("Resolver reported uses conflict").

Thanks for your help Glyn!

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Re: Retrieving a Bundle Classpath [message #754010 is a reply to message #753470]

Mon, 31 October 2011 12:57

Tony Day

Messages: 9
Registered: October 2011

Junior Member

Hi,

I'm still getting this CGLIB problem when trying to use Hibernate inside of Virgo.

I've tried everything that is suggested in the Virgo documentation - I'm importing the Hibernate bundles from the library provided by Spring Source Enterprise Bundles - Hibernate JPA (3.4.0.GA-A).

Any ideas why I am still getting this problem?

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