Disable creation of .orc.crc file

I am working with the apache orc-core java api. I have noticed a couple of things and was wondering if there are options to control them

Does not overwrite files. The call to OrcFile.createWriter fails if the specified file already exists. Is there an option to get it to overwrite by default?
Generates .crc files. If I write to a file called test.orc the program also creates a file called .test.orc.crc. Is there an option to disable this?

I know I can work around both of these simply by deleting the relevant files in the code. Was just wondering if there was a "proper" way.