Github user aledsage commented on the issue:
https://github.com/apache/brooklyn-server/pull/396
@neykov thanks for the pointers. The problem is that the entity's memento
is written with the plain type (i.e. not having the OSGi bundle name). The
`BasicEntityMemento.type` is a string of the implementation type, set in
`MementoGenerators.populateBrooklynObjectMementoBuilder`.
When we go to load that, we therefore don't know which bundle it came from.
And we can't tell the bundle from the catalog item either (because we're trying
to load from an arbitrary bundle, rather than a bundle that was in this catalog
item's `libraries` section).
Note that for "normal" class names, we write the OSGi prefix inside
`XmlMementoSerializer.OsgiClassnameMapper.serializedClass`.
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It's not obvious where the best place is to fix this. The
`MementoGenerators` currently know nothing about OSGi etc.
And the `XmlMementoSerializer` does not really want to poke around inside
`BasicEntityMemento` etc. It could register a `Converter` for it (and for all
the other subtypes of `AbstractMemento`), but that doesn't feel ideal.
On balance, I think putting something in the `MementoGenerators` is the
best bet. I'll explore that more.
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