Weird SAX exception only with jar-with-dependencies

I have code that is working fine in my test environment (running command line from Maven) but fails when I generate a jar-with-dependencies and run that from the command line. The relevant error is:

[XMPP Writer Thread] INFO org.doorways.montage.Chatter - XMPP status: DISCONNECTED (old status: AUTHENTICATED)
Status change caused by:
javax.xml.bind.MarshalException
 - with linked exception:
[com.sun.istack.internal.SAXException2: class rocks.xmpp.extensions.delay.model.DelayedDelivery nor any of its super class is known to this context.
javax.xml.bind.JAXBException: class rocks.xmpp.extensions.delay.model.DelayedDelivery nor any of its super class is known to this context.]
[XMPP Writer Thread] ERROR org.doorways.montage.Chatter - XMPP error: 
javax.xml.bind.MarshalException
 - with linked exception:
[com.sun.istack.internal.SAXException2: class rocks.xmpp.extensions.delay.model.DelayedDelivery nor any of its super class is known to this context.
javax.xml.bind.JAXBException: class rocks.xmpp.extensions.delay.model.DelayedDelivery nor any of its super class is known to this context.]
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:311)
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.marshal(MarshallerImpl.java:163)
    at rocks.xmpp.core.session.XmppStreamWriter.lambda$send$2(XmppStreamWriter.java:124)
    at java.util.concurrent.CompletableFuture$AsyncRun.run(CompletableFuture.java:1626)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)
Caused by: com.sun.istack.internal.SAXException2: class rocks.xmpp.extensions.delay.model.DelayedDelivery nor any of its super class is known to this context.
javax.xml.bind.JAXBException: class rocks.xmpp.extensions.delay.model.DelayedDelivery nor any of its super class is known to this context.
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:232)
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.reportError(XMLSerializer.java:247)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayReferenceNodeProperty.serializeListBody(ArrayReferenceNodeProperty.java:107)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayERProperty.serializeBody(ArrayERProperty.java:144)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeBody(ClassBeanInfoImpl.java:345)
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsSoleContent(XMLSerializer.java:578)
    at com.sun.xml.internal.bind.v2.runtime.ClassBeanInfoImpl.serializeRoot(ClassBeanInfoImpl.java:326)
    at com.sun.xml.internal.bind.v2.runtime.XMLSerializer.childAsRoot(XMLSerializer.java:479)
    at com.sun.xml.internal.bind.v2.runtime.MarshallerImpl.write(MarshallerImpl.java:308)
    ... 10 more
Caused by: javax.xml.bind.JAXBException: class rocks.xmpp.extensions.delay.model.DelayedDelivery nor any of its super class is known to this context.
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getBeanInfo(JAXBContextImpl.java:567)
    at com.sun.xml.internal.bind.v2.runtime.property.ArrayReferenceNodeProperty.serializeListBody(ArrayReferenceNodeProperty.java:97)
    ... 16 more

The only reference to this weirdness I've found online is four years old:

https://stackoverflow.com/questions/10350549/jaxb-marshal-exception-impl-class-nor-any-of-its-super-class-is-not-known-to-a

I'm currently using:

<dependency>
  <groupId>rocks.xmpp</groupId>
  <artifactId>xmpp-extensions-client</artifactId>
  <version>0.7.3</version>
</dependency>

I can see the relevant classes in my jar-with-dependencies:

rocks/xmpp/extensions/data/validate/model/Validation$ValidationMethod.class
rocks/xmpp/extensions/data/validate/model/Validation.class
rocks/xmpp/extensions/delay/model/DelayedDelivery.class
rocks/xmpp/extensions/delay/model/package-info.class
rocks/xmpp/extensions/disco/model/info/Feature.class
rocks/xmpp/extensions/disco/model/info/Identity.class

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