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Class Cast Exception when casting to common interface [message #629192]

Mon, 27 September 2010 13:03

Iulius

Messages: 4
Registered: March 2010

Junior Member

Hi everybody,

I am currently playing around with OSGi and especially with Equinox. however I'm running into a little problem and am stuck there right now. My sample app is designed as follows:

Java Main program, that starts the Framework via EclipseStarter.
Bundle "interfaces" that only contains common interfaces.
Bundle "operatorA" and Bundle "operatorB" which depend on the interfaces bundle.
When I try to run a service from operatorA Bundle and cast it to the common interface I get the following exception:

Exception in thread "main" java.lang.ClassCastException: ...

I am sure this is a class loader issue, but I have no idea how to circumvent it. Any suggestions?

Thank you!

cya,
Iulius

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Re: Class Cast Exception when casting to common interface [message #629197 is a reply to message #629192]

Mon, 27 September 2010 13:14

Thomas Watson

Messages: 503
Registered: July 2009

Senior Member

In order for bundles to share the same package in OSGi the bundles need to import the common package (using Import-Package header). Do you have a bundle which exports the common package (using the Export-Package manifest header)? And does your other bundles import this package (using the Import-Package manifest header)?

It sounds like you package the common interface into each bundle and they are loading the interface with their own bundle class loader at runtime, this would cause the cast exception.

HTH

Tom.

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Re: Class Cast Exception when casting to common interface [message #629204 is a reply to message #629192]

Mon, 27 September 2010 13:33

Iulius

Messages: 4
Registered: March 2010

Junior Member

the interface bundle exports the package

org.osgi.interfaces.export

whereas the other bundles import exactly this package.

the classes are solely exported in the interface bundle. so I am using the Import/Export package header and do not package the common interface with each bundle.

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