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Add a new PAYMENT_ACK message to the protocol. Make incrementPayment return a future that completes when the server has acknowledge the balance increase. Also, prevent users from overlapping multiple increase payment requests. This resolves race conditions that can occur when the billed-for activity is asynchronous to the protocol in which the micropayment protocol is embedded. In this case, it was previously impossible to know when the async activity could be resumed as it would otherwise race with the process of the server checking the payment signature and updating the balance. Most applications of micropayments will use a single protocol that has been extended with an embedding, and thus this is not an issue. However in some rare applications the payment process may run alongside the existing protocol rather than inside it. In this case, payment acks should be used for synchronization.
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