Ethereum(J) is a pure Java implementation of the Ethereum protocol. It is provided as a library that can be embedded into any Java/Scala project and provides full support for the Ethereum protocol and ancillary services. Ethereum(J) was originally developed by Roman Mandeleil and is now funded by <ether.camp>.
Ethereum(J) supports CPU mining. Currently it is implemented in pure Java and is available for private and test networks. You can even mine on the live Ethereum network, but this is not economical.
Link:
Blog: http://ethereumj.io/
Github: https://github.com/ethereum/ethereumj
Gitter Chat: https://gitter.im/ethereum/ethereumj
If you want to learn Ethereum DApp development efficiently , you can visit the most popular online interactive tutorials provided by Huizhi.com:
More other content is also available on this Ethereum blog .