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I want to develop a Spring MVC web application that use a private Ethereum network and I feel confused witch API to use Ethereumj or Web3j. I'd like to know the difference between them and how to connect my local blockchain.

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You should choose Web3j. Because, you want to create application that uses blockchain, being its client.

According official docs:

Web3j - is a client library.

EthereumJ - is the blockchain node itself

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