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Transaction inputs are now prepopulated with empty scriptSig. Each signer is expected to update this scriptSig with a signature at a proper place. There is a new method in RedeemData to locate index of the key/signature within scriptSig/program. To generalize an above approach for all supported types of inputs, RedeemData can now represent data for any type of input. For pay-to-address and pay-to-pubkey inputs it is expected to contain single key and CHECKSIG program. Signers now accept ProposedTransaction object that could carry additional metadata shared between signers. For now it shares derivation path of the signing key. To preserve the dummy sig feature, a new flag was introduced in a SendRequest. It specifies whether to fill empty sigs with dummies during tx completion or not. Default value is true (for backward compatibility). There is a CustomTransactionSigner class that may be used as a base for simple third-party signers (or may be not). It is used in unit test which may be treated as a usage example.
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 -Dexec.args="<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. Note that this example app does not use checkpointing, so the initial chain sync will be pretty slow. You can make an app that starts up and does the initial sync much faster by including a checkpoints file; see the documentation for more info on this. Now you are ready to follow the tutorial: https://bitcoinj.github.io/getting-started