Odd classloading problem can't find class in OSGI bundle

[Beta User]

I have a bundle A that requires bundle B (aka commonsconfiguration)

Require-Bundle: com.springsource.org.apache.commons.lang,
com.springsource.org.hibernate,
commonsconfiguration

B is a bundle I have produced via BND that wraps commons-configuration-1.5.jar (not in the repo yet, see https://issuetracker.springsource.com/browse/BRITS-59)

B is in the usr bundle dir and is shown as ACTIVE on the OSGI console. If I do a bundle command from the console I can see that BUNDLE B is exporting correctly package:

Exported packages
org.apache.commons.configuration.event; version="0.0.0"[exported]
org.apache.commons.configuration.plist; version="0.0.0"[exported]
org.apache.commons.configuration.reloading; version="0.0.0"[exported]
org.apache.commons.configuration.interpol; version="0.0.0"[exported]
org.apache.commons.configuration.web; version="0.0.0"[exported]
org.apache.commons.configuration.tree.xpath; version="0.0.0"[exported]
org.apache.commons.configuration; version="0.0.0"[exported]
org.apache.commons.configuration.beanutils; version="0.0.0"[exported]
org.apache.commons.configuration.tree; version="0.0.0"[exported]

Within bundle A I have a bean as follows:

<bean id="propertiesLoadedViaJDBC"
class="org.apache.commons.configuration.Configurat ionConverter"
factory-method="getProperties">
<constructor-arg>
<bean
class="org.apache.commons.configuration.DatabaseCo nfiguration">
<constructor-arg>
<ref local="dataSource" />
</constructor-arg>

<constructor-arg
ref="applicationProperties[config.table]" />
<constructor-arg
ref="applicationProperties[config.keyColumn]" />
<constructor-arg
ref="applicationProperties[config.valueColumn]" />
</bean>
</constructor-arg>
</bean>

Can anyone think of a reason why I am getting this when I try and deploy bundle A ?

<SPDE0100E> The class with name 'org.apache.commons.configuration.ConfigurationCon verter', referenced by bean 'propertiesLoadedViaJDBC', could not be loaded by class loader 'PlatformBundleClassLoader: [bundle=commonbasecore_1.0.3]':
java.lang.ClassNotFoundException: org.apache.commons.configuration.ConfigurationConv erter
at org.eclipse.osgi.framework.internal.core.BundleLoa der.findClassInternal(BundleLoader.java:481)
at org.eclipse.osgi.framework.internal.core.BundleLoa der.findClass(BundleLoader.java:397)
at org.eclipse.osgi.framework.internal.core.BundleLoa der.findClass(BundleLoader.java:385)
at org.eclipse.osgi.internal.baseadaptor.DefaultClass Loader.loadClass(DefaultClassLoader.java:87)
at com.springsource.platform.osgi.framework.equinox.P latformBundleClassLoader.loadClass(PlatformBundleC lassLoader.java:134)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 51)
at org.eclipse.osgi.framework.internal.core.BundleLoa der.loadClass(BundleLoader.java:313)
at org.eclipse.osgi.framework.internal.core.BundleHos t.loadClass(BundleHost.java:227)
at org.eclipse.osgi.framework.internal.core.AbstractB undle.loadClass(AbstractBundle.java:1274)
at org.springframework.osgi.util.BundleDelegatingClas sLoader.findClass(BundleDelegatingClassLoader.java :99)
at org.springframework.osgi.util.BundleDelegatingClas sLoader.loadClass(BundleDelegatingClassLoader.java :156)

[Beta User]

PS the post meant to say you can correctly see that package "org.apache.commons.configuration" is exported so my bundle B seems to be OK, but A is having a problem finding the class.

[Andy Wilkinson]

Hi Paul,

Just to be sure I understand your app correctly: is bundle A the 'commonbasecore' bundle with a version of 1.0.3, as mentioned in the SPDE100E error message?

Thanks,
Andy

[Beta User]

Yep, that will be the one.

[Beta User]

Hi Paul,

Can you use the bundle command in the osgi console to verify the package that has been export/import in bundle A/B?

In your require bundle example,

Require-Bundle: com.springsource.org.apache.commons.lang,
com.springsource.org.hibernate,
commonsconfiguration

Is commonsconfiguration the bundle symbolic name of bundle B?

Thanks,

Michael

[Andy Wilkinson]

Do you have the commons-configuration-1.5.jar file embedded within bundle b that you produced with BND? If so, have you referenced the embedded JAR in bundle b's Bundle-ClassPath manifest header?

[Beta User]

Something very strange has happened in that having upgraded to the latest nightly build of the STS ap eclipse plugin, the error went away. Possibly this was due to a clean re-start of Eclipse and the app server. I don't know, but will get back to you if the problem re-occurs