JavaSyntaxError parsing method reference

[hacktoon]

The code below is throwing a JavaSyntaxError because of the brackets in "Long[]::new", and I can't figure out why. Is it invalid Java?

public class StatementStepDefinition {
    public void foobar() {
        final Long[] secondaryTransactionsIds = getSecondaryTransactions().stream().toArray(Long[]::new);
    }
}

[jsjohnst]

It is valid JDK8 Streams API syntax. I ran into this issue too, so will see if I can submit a PR to resolve it.