Upgrading a CorDapp to a new platform version

These notes provide instructions for upgrading your CorDapps from previous versions, starting with the upgrade from our first public Beta ( Milestone 12), to V1.0.

General rules

Always remember to update the version identifiers in your project gradle file:

ext.corda_release_version = '1.0.0'
ext.corda_gradle_plugins_version = '1.0.0'

It may be necessary to update the version of major dependencies:

ext.kotlin_version = '1.1.4'
ext.quasar_version = '0.7.9'

Please consult the relevant release notes of the release in question. If not specified, you may assume the versions you are currently using are still in force.

We also strongly recommend cross referencing with the Changelog to confirm changes.

v3.0 to v3.1

Gradle Plugin Version

Corda 3.1 uses version 3.1.0 of the gradle plugins and your build.gradle file should be updated to reflect this.

ext.corda_gradle_plugins_version = '3.1.0'

You will also need to update the corda_release_version identifier in your project gradle file.

ext.corda_release_version = '3.1-corda'

V2.0 to V3.0

Gradle Plugin Version

Corda 3.0 uses version 3.0.9 of the gradle plugins and your build.gradle file should be updated to reflect this.

ext.corda_gradle_plugins_version = '3.0.9'

You will also need to update the corda_release_version identifier in your project gradle file.

ext.corda_release_version = 'corda-3.0'

Network Map Service

With the re-designed network map service the following changes need to be made:

  • The network map is no longer provided by a node and thus the networkMapService config is ignored. Instead the network map is either provided by the compatibility zone (CZ) operator (who operates the doorman) and available using the compatibilityZoneURL config, or is provided using signed node info files which are copied locally. See Network Map for more details, and setting-up-a-corda-network.rst on how to use the network bootstrapper for deploying a local network.
  • Configuration for a notary has been simplified. extraAdvertisedServiceIds, notaryNodeAddress, notaryClusterAddresses and bftSMaRt configs have been replaced by a single notary config object. See Node configuration for more details.
  • The advertisement of the notary to the rest of the network, and its validation type, is no longer determined by the extraAdvertisedServiceIds config. Instead it has been moved to the control of the network operator via the introduction of network parameters. The network bootstrapper automatically includes the configured notaries when generating the network parameters file for a local deployment.
  • Any nodes defined in a deployNodes gradle task performing the function of the network map can be removed, or the NetworkMap parameter can be removed for any “controller” node which is both the network map and a notary.
  • For registering a node with the doorman the certificateSigningService config has been replaced by compatibilityZoneURL.

Corda Plugins

  • Corda plugins have been modularised further so the following additional gradle entries are necessary: For example:>

The plugin needs to be applied in all gradle build files where there is a dependency on Corda using any of: cordaCompile, cordaRuntime, cordapp

  • For existing contract ORM schemas that extend from CommonSchemaV1.LinearState or CommonSchemaV1.FungibleState, you will need to explicitly map the participants collection to a database table. Previously this mapping was done in the superclass, but that makes it impossible to properly configure the table name. The required changes are to:
    • Add the override var participants: MutableSet<AbstractParty>? = null field to your class, and
    • Add JPA mappings

For example:>

@Table(name = "cash_states_v2",
        indexes = arrayOf(Index(name = "ccy_code_idx2", columnList = "ccy_code")))
class PersistentCashState(

        @Column(name = "participants")
        @CollectionTable(name="cash_states_v2_participants", joinColumns = arrayOf(
                JoinColumn(name = "output_index", referencedColumnName = "output_index"),
                JoinColumn(name = "transaction_id", referencedColumnName = "transaction_id")))
        override var participants: MutableSet<AbstractParty>? = null,


Whilst the enablement of AMQP is a transparent change, as noted in the Object serialization documentation the way classes, and states in particular, should be written to work with this new library may require some alteration to your current implementation.

  • With AMQP enabled Java classes must be compiled with the -parameter flag.

    • If they aren’t, then the error message will complain about arg<N> being an unknown parameter.
    • If recompilation is not viable, a custom serializer can be written as per Pluggable Serializers for CorDapps
    • It is important to bear in mind that with AMQP there must be an implicit mapping between constructor parameters and properties you wish included in the serialized form of a class.
  • Error messages of the formConstructor parameter - "<some parameter of a constructor>" - doesn't refer to a property of "class <some.class.being.serialized>"indicate that a class, in the above example some.class.being.serialized, has a parameter on its primary constructor that doesn’t correlate to a property of the class. This is a problem because the Corda AMQP serialization library uses a class’s constructor (default, primary, or annotated) as the means by which instances of the serialized form are reconstituted.See the section “Mismatched Class Properties / Constructor Parameters” in the Object serialization documentation

Database schema changes

An H2 database instance (represented on the filesystem as a file called persistence.mv.db) used in Corda 1.0 or 2.0 cannot be directly reused with Corda 3.0 due to minor improvements and additions to stabilise the underlying schemas.


Nodes that do not require SSL to be enabled for RPC clients now need an additional port to be specified as part of their configuration. To do this, add a block as follows to the nodes configuraiton:

rpcSettings {
    adminAddress "localhost:10007"

to node.conf files.

Also, the property rpcPort is now deprecated, so it would be preferable to substitute properties specified that way e.g., rpcPort=10006 with a block as follows:

rpcSettings {
    address "localhost:10006"
    adminAddress "localhost:10007"

Equivalent changes should be performed on classes extending CordformDefinition.


  • The registration mechanism for CorDapps in MockNetwork unit tests has changed:

    • CorDapp registration is now done via the cordappPackages constructor parameter of MockNetwork. This parameter is a list of String values which should be the package names of the CorDapps containing the contract verification code you wish to load
    • The unsetCordappPackages method is now redundant and has been removed
  • Many classes have been moved between packages, so you will need to update your imports

  • setCordappPackages and unsetCordappPackages have been removed from the ledger/transaction DSL and the flow test framework, and are now set via a constructor parameter or automatically when constructing the MockServices or MockNetwork object

  • Key constants e.g. ALICE_KEY have been removed; you can now use TestIdentity to make your own

  • The ledger/transaction DSL must now be provided with MockServices as it no longer makes its own

  • In transaction blocks, input and output take their arguments as ContractStates rather than lambdas

  • Also in transaction blocks, command takes its arguments as CommandDatas rather than lambdas

  • The MockServices API has changed; please refer to its API documentation

  • TestDependencyInjectionBase has been retired in favour of a JUnit Rule called SerializationEnvironmentRule

  • This replaces the initialiseSerialization parameter of ledger/transaction and verifierDriver

  • The withTestSerialization method is obsoleted by SerializationEnvironmentRule and has been retired

    • Similarly, the MockNetwork.createNode methods now take a MockNodeParameters builder
  • MockNode constructor parameters are now aggregated in MockNodeArgs for easier subclassing

  • MockNetwork.Factory has been retired as you can simply use a lambda

  • testNodeConfiguration has been retired, please use a mock object framework of your choice instead

  • MockNetwork.createSomeNodes and IntegrationTestCategory have been retired with no replacement

  • Starting a flow can now be done directly from a node object. Change calls of the form node.getServices().startFlow(...) to node.startFlow(...)

  • Similarly a tranaction can be executed directly from a node object. Change calls of the form node.getDatabase().transaction({ it -> ... }) to node.transaction({() -> ... })

  • startFlow now returns a CordaFuture, there is no need to call startFlow(...).getResultantFuture()

V1.0 to V2.0

  • You need to update the corda_release_version identifier in your project gradle file. The corda_gradle_plugins_version should remain at 1.0.0:>
ext.corda_release_version = '2.0.0'
ext.corda_gradle_plugins_version = '1.0.0'

Public Beta (M12) to V1.0


  • MockNetwork has moved. To continue using MockNetwork for testing, you must add the following dependency to your build.gradle file:>
testCompile "net.corda:corda-node-driver:$corda_release_version"


  • CordaPluginRegistry has been removed:
    • The one remaining configuration item customizeSerialisation, which defined a optional whitelist of types for use in object serialization, has been replaced with the SerializationWhitelist interface which should be implemented to define a list of equivalent whitelisted classes
    • You will need to rename your services resource file. ‘resources/META-INF/services/net.corda.core.node.CordaPluginRegistry’ becomes ‘resources/META-INF/services/net.corda.core.serialization.SerializationWhitelist’
    • MockNode.testPluginRegistries was renamed to MockNode.testSerializationWhitelists
    • In general, the @CordaSerializable annotation is the preferred method for whitelisting, as described in Object serialization

Missing imports

Use IntelliJ’s automatic imports feature to intelligently resolve the new imports:

  • Missing imports for contract types:

    • CommercialPaper and Cash are now contained within the finance module, as are associated helpers functions. For example:
      • import net.corda.contracts.ICommercialPaperState becomes import net.corda.finance.contracts.ICommercialPaperState
      • import net.corda.contracts.asset.sumCashBy becomes import net.corda.finance.utils.sumCashBy
      • import net.corda.core.contracts.DOLLARS becomes import net.corda.finance.DOLLARS
      • import net.corda.core.contracts.issued by becomes import net.corda.finance.issued by
      • import net.corda.contracts.asset.Cash becomes import net.corda.finance.contracts.asset.Cash
  • Missing imports for utility functions:

    • Many common types and helper methods have been consolidated into net.corda.core.utilities package. For example:
      • import net.corda.core.crypto.commonName becomes import net.corda.core.utilities.commonName
      • import net.corda.core.crypto.toBase58String becomes import net.corda.core.utilities.toBase58String
      • import net.corda.core.getOrThrow becomes import net.corda.core.utilities.getOrThrow
  • Missing flow imports:

    • In general, all reusable library flows are contained within the core API net.corda.core.flows package
    • Financial domain library flows are contained within the finance module net.corda.finance.flows package
    • Other flows that have moved include import net.corda.core.flows.ResolveTransactionsFlow, which becomes import net.corda.core.internal.ResolveTransactionsFlow

Core data structures

  • Missing Contract override:

    • Contract.legalContractReference has been removed, and replaced by the optional annotation @LegalProseReference(uri = "<URI>")
  • Unresolved reference:

    • AuthenticatedObject was renamed to CommandWithParties
  • Overrides nothing:

    • LinearState.isRelevant was removed. Whether a node stores a LinearState in its vault depends on whether the node is one of the state’s participants
    • txBuilder.toLedgerTransaction now requires a ServiceHub parameter. This is used by the new Contract Constraints functionality to validate and resolve attachments

Flow framework

  • FlowLogic communication has been upgraded to use explicit FlowSession instances to communicate between nodes:

    • FlowLogic.send/FlowLogic.receive/FlowLogic.sendAndReceive has been replaced by FlowSession.send/ FlowSession.receive/FlowSession.sendAndReceive. The replacement functions do not take a destination parameter, as this is defined implictly by the session used
    • Initiated flows now take in a FlowSession instead of Party in their constructor. If you need to access the counterparty identity, it is in the counterparty property of the flow session
  • FinalityFlow now returns a single SignedTransaction, instead of a List<SignedTransaction>

  • TransactionKeyFlow was renamed to SwapIdentitiesFlow

  • SwapIdentitiesFlow must be imported from the confidential-identities package net.corda.confidential

Node services (ServiceHub)

  • Unresolved reference to vaultQueryService:

    • Replace all references to <services>.vaultQueryService with <services>.vaultService
    • Previously there were two vault APIs. Now there is a single unified API with the same functions: VaultService.
  • FlowLogic.ourIdentity has been introduced as a shortcut for retrieving our identity in a flow

  • serviceHub.myInfo.legalIdentity no longer exists

  • getAnyNotary has been removed. Use serviceHub.networkMapCache.notaryIdentities[0] instead

  • ServiceHub.networkMapUpdates is replaced by ServiceHub.networkMapFeed

  • ServiceHub.partyFromX500Name is replaced by ServiceHub.wellKnownPartyFromX500Name

    • A “well known” party is one that isn’t anonymous. This change was motivated by the confidential identities work

RPC Client

  • Missing API methods on the CordaRPCOps interface:
    • verifiedTransactionsFeed has been replaced by internalVerifiedTransactionsFeed
    • verifiedTransactions has been replaced by internalVerifiedTransactionsSnapshot
    • These changes are in preparation for the planned integration of Intel SGX™, which will encrypt the transactions feed. Apps that use this API will not work on encrypted ledgers. They should generally be modified to use the vault query API instead
    • Accessing the networkMapCache via services.nodeInfo().legalIdentities returns a list of identities
      • This change is in preparation for allowing a node to host multiple separate identities in the future


Please note that Clauses have been removed completely as of V1.0. We will be revisiting this capability in a future release.

  • CorDapps must be explicitly registered in MockNetwork unit tests:

    • This is done by calling setCordappPackages, an extension helper function in the net.corda.testing package, on the first line of your @Before method. This takes a variable number of String arguments which should be the package names of the CorDapps containing the contract verification code you wish to load
    • You should unset CorDapp packages in your @After method by using unsetCordappPackages after stopNodes
  • CorDapps must be explicitly registered in DriverDSL and RPCDriverDSL integration tests:

    • You must register package names of the CorDapps containing the contract verification code you wish to load using the extraCordappPackagesToScan: List<String> constructor parameter of the driver DSL


  • FungibleAsset interface simplification:
    • The Commands grouping interface that included the Move, Issue and Exit interfaces has been removed
    • The move function has been renamed to withNewOwnerAndAmount
  • This is for consistency with OwnableState.withNewOwner


  • args[0].parseNetworkHostAndPort() becomes NetworkHostAndPort.parse(args[0])
  • There is no longer a NodeInfo.advertisedServices property
    • The concept of advertised services has been removed from Corda. This is because it was vaguely defined and real-world apps would not typically select random, unknown counterparties from the network map based on self-declared capabilities
    • We will introduce a replacement for this functionality, business networks, in a future release
    • For now, services should be retrieved by legal name using NetworkMapCache.getNodeByLegalName


  • Be sure to use the correct identity when issuing cash:
    • The third parameter to CashIssueFlow should be the notary (and not the node identity)

From Milestone 13

Core data structures

  • TransactionBuilder changes:

    • Use convenience class StateAndContract instead of TransactionBuilder.withItems for passing around a state and its contract.
  • Transaction builder DSL changes:

    • When adding inputs and outputs to a transaction builder, you must also specify ContractClassName
      • ContractClassName is the name of the Contract subclass used to verify the transaction
  • Contract verify method signature change:

    • override fun verify(tx: TransactionForContract) becomes override fun verify(tx: LedgerTransaction)
  • You no longer need to override ContractState.contract function

Node services (ServiceHub)

  • ServiceHub API method changes:
    • services.networkMapUpdates().justSnapshot becomes services.networkMapSnapshot()


  • No longer need to define CordaPluginRegistry and configure requiredSchemas:
    • Custom contract schemas are automatically detected at startup time by class path scanning
    • For testing purposes, use the SchemaService method to register new custom schemas (e.g. services.schemaService.registerCustomSchemas(setOf(YoSchemaV1)))


  • Party names are now CordaX500Name, not X500Name:
    • CordaX500Name specifies a predefined set of mandatory (organisation, locality, country) and optional fields (common name, organisation unit, state) with validation checking
    • Use new builder CordaX500Name.build(X500Name(target)) or explicitly define the X500Name parameters using the CordaX500Name constructors


  • MockNetwork testing:

    • Mock nodes in node tests are now of type StartedNode<MockNode>, rather than MockNode
    • MockNetwork now returns a BasketOf(<StartedNode<MockNode>>)
    • You must call internals on StartedNode to get MockNode (e.g. a = nodes.partyNodes[0].internals)
  • Host and port changes:

    • Use string helper function parseNetworkHostAndPort to parse a URL on startup (e.g. val hostAndPort = args[0].parseNetworkHostAndPort())
  • Node driver parameter changes:

    • The node driver parameters for starting a node have been reordered
    • The node’s name needs to be given as an CordaX500Name, instead of using getX509Name

From Milestone 12 (First Public Beta)

Core data structures

  • Transaction building:
    • You no longer need to specify the type of a TransactionBuilder as TransactionType.General
    • TransactionType.General.Builder(notary) becomes TransactionBuilder(notary)


  • Gradle dependency reference changes:
    • Module names have changed to include corda in the artifacts’ JAR names:
compile "net.corda:core:$corda_release_version" -> compile "net.corda:corda-core:$corda_release_version"
compile "net.corda:finance:$corda_release_version" -> compile "net.corda:corda-finance:$corda_release_version"
compile "net.corda:jackson:$corda_release_version" -> compile "net.corda:corda-jackson:$corda_release_version"
compile "net.corda:node:$corda_release_version" -> compile "net.corda:corda-node:$corda_release_version"
compile "net.corda:rpc:$corda_release_version" -> compile "net.corda:corda-rpc:$corda_release_version"

Node services (ServiceHub)

  • ServiceHub API changes:
    • services.networkMapUpdates becomes services.networkMapFeed
    • services.getCashBalances becomes a helper method in the finance module contracts package (net.corda.finance.contracts.getCashBalances)


  • Financial asset contracts (Cash, CommercialPaper, Obligations) are now a standalone CorDapp within the finance module:

    • You need to import them from their respective packages within the finance module (e.g. net.corda.finance.contracts.asset.Cash)
    • You need to import the associated asset flows from their respective packages within finance module. For example:
      • net.corda.finance.flows.CashIssueFlow
      • net.corda.finance.flows.CashIssueAndPaymentFlow
      • net.corda.finance.flows.CashExitFlow
  • The finance gradle project files have been moved into a net.corda.finance package namespace:

    • Adjust imports of Cash flow references
    • Adjust the StartFlow permission in gradle.build files
    • Adjust imports of the associated flows (Cash*Flow, TwoPartyTradeFlow, TwoPartyDealFlow)