3.x versions fixed the exception handling in the java code. Prior versions
(2.6.1) would silently ignore exceptions.
Also added logging, which is the log you are showing. In that log, all those
lines start with INFO and shows what 2.6.1 was likely doing without advertising
it.
In this particu
3.3 hdfjava added exception handling and reporting. This is likely what you are
running into, they were always there, just being ignored.
Also, hdfjava would always check for image attributes by name, if a dataset was
opened and those log errors are a result of blindly calling
H5Aget_attribut
