I've seen this happen in my own custom Java when importing from one project to another. The only solution I've found is to go in and update the parameter names in the java files.
Edit: See comments for reason why Java does this and alternate solution.
Thanks for reporting, I will make sure this one is fixed in the next release. The work around is indeed to rename the parameter. Note that afaik this only happens if you have an entity named 'Date' in your project somewhere.