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Apparently this simple utility class might start to need unit tests now! To resolve the hack, we need to resolve some circularity in construction: to add the payment channels wallet extensions requires the peerGroup and wallet object to be constructed, but to construct the peerGroup requires the chain+store and to checkpoint a fresh store requires the wallet. Catch 22! We resolve by loading a temp wallet and then throwing it away, which is inefficient for a large wallet that's being replayed but normally shouldn't matter. Once the payment channels stuff is more mature and tested, we might want to just fold it into the core wallet format.
To get started, ensure you have the latest JDK installed, and download Maven from: http://maven.apache.org/ Then run "mvn clean package" to compile the software. You can also run "mvn site:site" to generate a website with useful information like JavaDocs. The outputs are under the target/ directory. Alternatively, just import the project using your IDE. IntelliJ has Maven integration once you tell it where to find your unzipped Maven install directory. Now try running one of the example apps: cd examples mvn exec:java -Dexec.mainClass=com.google.bitcoin.examples.ForwardingService <insert a bitcoin address here> It will download the block chain and eventually print a Bitcoin address. If you send coins to it, it will forward them on to the address you specified. Now you are ready to follow the tutorial: https://code.google.com/p/bitcoinj/wiki/GettingStarted