In case anybody encounters this problem. I found the cause and solution.
The problem is that the property is multi-value:
propertyDef.setName("my:IsFriendOf");
propertyDef.setMultiple(true);
The error message is kind of misleading; what is actually happening is that
the property exists, but with a different data type. The problem goes away
by setting the property this way:
Value val[] = new
Value[]{session.getValueFactory().createValue(jane)};
joe.setProperty("my:IsFriendOf", val);
I wish this error message was more informative. It should say something
about incompatible data types, rather than the "not found" misleading
message.
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