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Application does not start after adding an aditional OSGi declarative service. [message #1767367]

Wed, 05 July 2017 10:05

Vladimir Jaksic

Messages: 1
Registered: July 2017

Junior Member

I have a Problem with OSGi declarative services. I am referencing an IResource in my interface and therefore, the application suddenly fails to start with an error:

Caused by: java.lang.IllegalStateException: The instance data location has not been specified yet.

And

java.lang.NoClassDefFoundError: org/eclipse/core/resources/IResource.

I have tried adding the org.eclipse.core.resources to the required bundles in the manifest, but to no avail. Any clues about bringing this about?

I have added the full exception trace to the attachments.

Attachment: exception_trace.log
(Size: 440.99KB, Downloaded 117 times)

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Re: Application does not start after adding an aditional OSGi declarative service. [message #1767394 is a reply to message #1767367]

Wed, 05 July 2017 15:19

Eclipse User

Referencing `IResource` isn't a problem in itself, but your service is being activated, causing the JVM to load the referenced class definitions, before the Eclipse workspace is available. `org.eclipse.core.resources`'s Bundle Activator tries to restore the workspace, which requires accessing the OSGi `osgi.instance.area` location, which has not yet been set.

It's hard to say more without knowing more about your declarative service. A few possible ways to avoid this issue include (1) using the IAdapter mechanism to avoid specifying IResource in your method signatures, (2) adding a dependency on the IWorkspace service (exposed by `org.eclipse.core.resources`) so that your service won't be available until the workspace has been started.

Brian.

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