Hi Migueal, Am Mittwoch, den 12.09.2007, 11:46 +0100 schrieb Miguel Matos: > > So you would have to make sure the JMX > > Server knows about how to load the MBeans from within the Bundles - > > given that Bundles may come and go, this sounds like tricky. Generally I > > try no to use the JMX Server to create MBeans because of these issues. > > > How do you create the MBeans ?
Generally, I have my internal services and state objects, which register themselves with the JMX Server, either directly or using some ProxyMBean. But I have to admit, that I never had a requirement to have the JMX-based administrator create MBeans - and when there was the slightest chance, there could be such a requirement, I quickly found a workaround :-) > As a side question is this a general problem when using reflection in > a osgi environment? Reflection in itself is not the primary issue. The problem is tampering with class loading. And this is somewhat involved if you come from the traditional Java ClassLoader hierarchy model where each class loader knows all classes of its ancestor class loaders. In OSGi environment, each bundle has its class loader which only asks its parent class loader under certain circumstances (mainly bootdelegation classes). Generally, a bundle class loader only knows about its imports and the bundle-contained classes. One option to find solutions regarding class loaders and bundles might be to implement a class loader along the lines of the Equinox BundleProxyClassLoader recipe [1]. Regards Felix [1] http://wiki.eclipse.org/BundleProxyClassLoader_recipe > > Miguel Matos > > Hope this helps. > > > > Regards > > Felix > > > > Am Dienstag, den 11.09.2007, 23:28 +0100 schrieb MMatos: > > > > > Hello! > > > > > > I've been playing with apache felix for some months. Now I am building > > > a bundle that depends on external jars and use a bit of reflection. > > > > > > To overcome the problem of the external library I have used the > > > Bundle-ClassPath: manifest header. > > > > > > Currently my problem is when I tried to load a class using reflection > > > and I get a class not found exception. > > > > > > > > > javax.management.ReflectionException: The MBean class could not be > > > loaded by the default loader repository > > > at > > > com.sun.jmx.mbeanserver.MBeanInstantiatorImpl.findClassWithDefaultLoaderRepository(MBeanInstantiatorImpl.java:61) > > > at > > > com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.createMBean(DefaultMBeanServerInterceptor.java:271) > > > at > > > com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.createMBean(DefaultMBeanServerInterceptor.java:211) > > > at > > > com.sun.jmx.mbeanserver.JmxMBeanServer.createMBean(JmxMBeanServer.java:408) > > > at > > > kAdapt.mbeanServer.MainServer.registerMBean(MainServer.java:131) > > > > > > > > > Caused by: java.lang.ClassNotFoundException: kAdapt.mbeanServer.InfoMBean > > > at > > > com.sun.jmx.mbeanserver.ClassLoaderRepositorySupport.loadClass(ClassLoaderRepositorySupport.java:208) > > > at > > > com.sun.jmx.mbeanserver.ClassLoaderRepositorySupport.loadClass(ClassLoaderRepositorySupport.java:128) > > > at > > > com.sun.jmx.mbeanserver.MBeanInstantiatorImpl.findClassWithDefaultLoaderRepository(MBeanInstantiatorImpl.java:58) > > > ... 18 more > > > > > > > > > The class in question kAdapt.mbeanServer.InfoMBean is of course in the > > > package hierarchy but the osgi classloader seems to miss it ... > > > I would like to know why this happens and the solution. > > > > > > ( In this particular problem the class failing to load is an MBean when > > > trying to create it > > > -->> at > > > com.sun.jmx.mbeanserver.MBeanInstantiatorImpl.findClassWithDefaultLoaderRepository(MBeanInstantiatorImpl.java:61) > > > but I think that this problem will happen whenever one uses reflection > > > ... Am I right ? > > > ) > > > > > > I tried with DynamicImport-Package but without success too ... > > > > > > Here is my manifest > > > > > > Manifest-Version: 1.0 > > > Archiver-Version: Plexus Archiver > > > Created-By: Apache Maven > > > Build-Jdk: 1.5.0_12 > > > Bundle-Activator: kAdapt.Activator > > > DynamicImport-Package: kAdapt.mbeanServer <<---- the class not found > > > is here > > > Bundle-ClassPath: .,kAdapt,js-1.6R5.jar > > > Import-Package: org.osgi.framework;version=1.3,org.osgi.service.log;ve > > > rsion=1.3,javax.management.remote,javax.management,javax.xml.parsers, > > > org.w3c.dom,org.xml.sax > > > Bundle-ManifestVersion: 2 > > > > > > Any guidance will be greatly appreciated. > > > > > > Miguel Matos > > > > > > PS: I think I could use the jmx facilities provided by felix ( I am > > > already doing that in another bundle, but that is not the point in my > > > question....)) > > > > > > --------------------------------------------------------------------- > > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] For > additional commands, e-mail: [EMAIL PROTECTED] --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
