ZoneVersionTooLowException when working with MockNetwork - corda

Question

cordaVersion = 4.3
tokens_release_version = '1.1-RC06-PRESIGN'
OS = Windows 10
Using a MockNetwork I was testing TokenPointer’s that point to EvolvableTokenType’s (reference states) using the TokenSDK when I got the following error message:
net.corda.core.node.ZoneVersionTooLowException: Reference states requires all nodes on the Corda compatibility zone to be running at least platform version 4. The current zone is only enforcing a minimum platform version of 1. Please contact your zone operator.

Answer 1

I got the same ZoneVersionTooLowException error when using reference states in my contract and testing the flows using MockNetwork.
I fixed it by changing the minimumPlatformVersion to 4 in the testNetworkParameters class and using that to construct my MockNetwork. Here is the snippet in Kotlin.
import net.corda.testing.common.internal.testNetworkParameters
class AssetCreationFlowTests {
private lateinit var network: MockNetwork
private lateinit var a: StartedMockNode
private lateinit var b: StartedMockNode
#Before
fun setup() {
val myNetworkParameters = testNetworkParameters(minimumPlatformVersion = 4)
network = MockNetwork(MockNetworkParameters(
cordappsForAllNodes = listOf(
TestCordapp.findCordapp(AssetContract::class.packageName)
),
networkParameters = myNetworkParameters
)
)

Answer 2

I looked on stackoverflow and found this but I was determined to get a MockNetwork working because it is so handy for testing.
I had to create my MockNetwork manually versus using the defaults. I extracted all the MockNetwork properties from a default build of a MockNetwork:
MockNetwork mockNet = new MockNetwork(new MockNetworkParameters(getTestCordapps()));
Step 1) Build a NetworkParameters object setting the minimumPlatformVersion to 4:
List<NotaryInfo> notaryinfo = Arrays.asList();
NetworkParameters networkParameters = new NetworkParameters(
4,
notaryinfo,
10485760,
524288000,
java.time.Instant.now(),
1,
Collections.emptyMap()
);
Step 2) Create a MockNetworkParameters object using the new NetworkParameters;
MockNetworkParameters mockNetworkParameters = new MockNetworkParameters(
false,
false,
new InMemoryMessagingNetwork.ServicePeerAllocationStrategy.Random.Random(),
Arrays.asList(new MockNetworkNotarySpec(new CordaX500Name("Notary Service", "Zurich", "CH"), true)),
networkParameters,
getTestCordapps()
);
NB: getTestCordapps() just returns a List<TestCordapp> that I need for the test I am performing i.e.
private List<TestCordapp> getTestCordapps() {
return ImmutableList.of(
TestCordapp.findCordapp("com.template.contracts"),
TestCordapp.findCordapp("com.template.flows"),
TestCordapp.findCordapp("com.r3.corda.lib.tokens.contracts"),
etc.
etc.
)}
Step 3) Build your MockNetwork with your MockNetworkParameters object:
MockNetwork mockNetwork = new MockNetwork(mockNetworkParameters);
I’ve been using it for a few weeks and it seems to work. If there is a better way please let me know.