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Very Weird Casting Exception - I've Never Seen Anything Like This with EMF [message #1843747]

Mon, 16 August 2021 16:07

Brandon Lewis

Messages: 268
Registered: May 2012

Senior Member

Caused by: java.lang.ClassCastException: class <package>.impl.InterconnectionTypeImpl cannot be cast to class <package>.InterconnectionType
(<package>.impl.InterconnectionTypeImpl is in unnamed module of loader org.eclipse.osgi.internal.loader.EquinoxClassLoader @6c361fde;
<package>.InterconnectionType is in unnamed module of loader org.eclipse.sirius.editor.utils.WorkspaceClassLoading$2 @6fd0034f)

I'm in a Sirius service trying to scope the legal things I can reference trying to calculate Domain based edges.

I have never seen this type of cast error from EMF before since the beginning of my use with it.

Any ideas?

When I launched the debugger for the very first time, my Windows box complained about some firewall settings etc.etc... I closed the window not understanding what was going on. Would this have anything to do with it?

I blown away my plugins that were auto-generated from EMF and re-generated them. No luck. URIs and namespaces all look spelled the same.

I get the exception occuring in my services even during normal runtime - so it's not just the debugger.

Java 11, Eclipse 2020_06, Sirius 6.5.1

[Updated on: Mon, 16 August 2021 16:09]

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Re: Very Weird Casting Exception - I've Never Seen Anything Like This with EMF [message #1843764 is a reply to message #1843747]

Tue, 17 August 2021 07:02

Ed Willink

Messages: 7655
Registered: July 2009

Senior Member

Hi

EMF CCE: I would normally suggest that this is a classic case of metamodel schizophrenia; same metamodel loaded twice, but in this case I see the "ClassLoader" and "unnamed module" red flags so I suggest that you have a 'bad' classpath that allows Java code to be loaded in conflicting fashions.

Even before Java 8 it was important to avoid multi-loading and you will find that there a number of places where EMF takes great care to use the context ClassLoader. It may be that you or the Sirius application code should do the same. It is very important for shared tooling plugins to reach out to use a ClassLoader that includes the user classes. The more recent versions of Java put stronger constraints on loading that I have so far succeeded in avoiding needing to understand.

As always, a fuller report can get a fuller answer. Why have you not shared the stack trace that is full of diagnostic information such as what looks like a bad call path to org.eclipse.sirius.editor.utils.WorkspaceClassLoading$2?

Regards

Ed Willink

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Re: Very Weird Casting Exception - I've Never Seen Anything Like This with EMF [message #1843773 is a reply to message #1843764]

Tue, 17 August 2021 11:54

Brandon Lewis

Messages: 268
Registered: May 2012

Senior Member

After re-generating the model cod, I did a -clearPersistedData and then followed that with cleaning the entire workspace. I am back to working now.

That was a pretty wild error I'd never seen before.

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