Hay @discernente,

thank you for pointing this out and sorry for the late reply. I've updated the sample at GitHub. The following snippet should work again:

[...]
Transaction transaction = new Transaction();
// The expiration date defines how long the transaction is valid. This field is optional and SteemJ will automatically use the current system time and an offset.
transaction.setExpirationDate("2016-04-06T08:29:27UTC");
// Define in which block the transaction should be added. In most cases this is the next available block which can be asked using the following lines:
GlobalProperties globalProperties = steemApiWrapper.getDynamicGlobalProperties();

transaction.setRefBlockPrefix(globalProperties.getHeadBlockId().getHashValue());
transaction.setRefBlockNum(globalProperties.getHeadBlockId().getNumberFromHash());

// There is also the option to add extensions to a transaction which are currently not used by Steem and therefore not supported by SteemJ.
// transaction.setExtensions(extensions);

// A Transaction accepts one or more Operations which have to be provided as an ArrayList.
ArrayList<Operation> operations = new ArrayList<>();
[...]