On 11/4/09 4:18, peter lawrey wrote:
Hello, I have found that having the same package in two bundles, where one depends on the other causes a problem. This is ok if the bundles are independent, but if the same package appears in more than one bundle, only one bundle will work.
You are creating a split package (i.e., a package spanning multiple bundles) then exporting/importing this package from both bundles. This sort of thing is specifically not allowed by OSGi, so this is just an error in your bundles.
If you import a package from another bundle, it will completely shadow an internal package of the same name. See the OSGi spec on class search order. Imports are searched before the bundle class path and they are terminal.
By both importing and exporting the package, you are giving the OSGi framework the choice to treat the bundle as an importer or an exporter (in this case the "or" is "xor"). So, in your scenario, most likely one of your bundles is being selected as an exporter and the other is being selected as an importer.
Moral to the story, don't use split packages. -> richard
When I attempt to load the second bundle I get the following error. However if the second bundle uses a different package, there is no problem. I don't know if this should be an error or not but it could be handled better, either by reporting the true error or not reporting an error and working. One think I found confusing was the message "Cannot create a POJO instance, the POJO constructor invocation has thrown an exception : null" which indicates that the constructor was called but threw an unknown exception. Neither the constructor nor the static block for the class is called. See attached for an example. 10:08:26,384 | ERROR | Thread-29 | SamePackage Two | ? ? | [ERROR] SampleImplementation : [SampleImplementationA] Class not found during the loading phase : samepackage.SampleImplementation 10:08:26,385 | ERROR | Thread-29 | SamePackage Two | ? ? | [ERROR] SampleImplementation : [SampleImplementationA] createInstance -> The POJO constructor invocation failed : null 10:08:26,387 | ERROR | Thread-29 | SamePackage Two | ? ? | [ERROR] SampleImplementation : Cannot create a POJO instance, the POJO constructor invocation has thrown an exception : null java.lang.RuntimeException: Cannot create a POJO instance, the POJO constructor invocation has thrown an exception : null at org.apache.felix.ipojo.InstanceManager.createObject(InstanceManager.java :639) at org.apache.felix.ipojo.InstanceManager.getPojoObject(InstanceManager.jav a:776) at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHand ler.__stateChanged(LifecycleCallbackHandler.java:156) at org.apache.felix.ipojo.handlers.lifecycle.callback.LifecycleCallbackHand ler.stateChanged(LifecycleCallbackHandler.java) at org.apache.felix.ipojo.InstanceManager.setState(InstanceManager.java:440 ) at org.apache.felix.ipojo.InstanceManager.start(InstanceManager.java:321) at org.apache.felix.ipojo.ComponentFactory.createInstance(ComponentFactory. java:155) at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory .java:298) at org.apache.felix.ipojo.IPojoFactory.createComponentInstance(IPojoFactory .java:235) at org.apache.felix.ipojo.InstanceCreator$ManagedInstance.create(InstanceCr eator.java:360) at org.apache.felix.ipojo.InstanceCreator.addInstance(InstanceCreator.java: 89) at org.apache.felix.ipojo.Extender.parse(Extender.java:269) at org.apache.felix.ipojo.Extender.startManagementFor(Extender.java:208) at org.apache.felix.ipojo.Extender.access$600(Extender.java:52) at org.apache.felix.ipojo.Extender$CreatorThread.run(Extender.java:669) at java.lang.Thread.run(Thread.java:619) 10:08:26,387 | ERROR | Thread-29 | SamePackage Two | ? ? | [ERROR] SampleImplementation : Cannot create a POJO instance, the POJO constructor invocation has thrown an exception : null 10:08:26,388 | ERROR | Thread-29 | ipojo | ? ? | [ERROR] iPOJO Instance Creator : A matching factory was found for {component=SampleImplementation, instance.name=SampleImplementationA}, but the instantiation failed : The configuration is not correct for the type SampleImplementation : Cannot create a POJO instance, the POJO constructor invocation has thrown an exception : null--------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@felix.apache.org For additional commands, e-mail: users-h...@felix.apache.org
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