I want to develop some apps with java .

But when  I  try to get the balance for a special btc address  from my local  blockchain(local database) .

I don't know how to load the database(may be you call the storedblock class).

I have download the official database and it seems don't work.

As i have checked the old topics in this bbs ,there is a requirement of special database . named    *******.blockchain.

I want to ask ,where to download that type of blockchain.

Thank you very much.