The disclosure has taken many industry watchers by surprise. Oracle hails from a software background and Sun has a pedigree in the server space,
But the merger has already failed to get through the 30-day review process with US authorities because of some issues around Java licensing which should be resolved in the next few weeks.
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According to Reuters, the EU is to scrutinise the deal later this month with Java licensing on the agenda again. Oracle CEO Larry Ellison has previously commented on adapting licensing for smartphones.
Oracle announced a $7.4bn deal to buy Sun in April and has said that it aims to have the acquisition process complete by the end of August.
The EU has 25 days to review the acquisition.
A version of this story originally appeared on MicroScope.