Cannot Issue an IOU on Corda-Training-Template Java-Src

[JonathanScialpi]

The IOUIssueFlow takes a parameter of IOUState state. As described in creating-an-instance-of-a-class, we can provide the state object to the flow via the crash shell as (also tried without the dollar sign):

flow start IOUIssueFlow$InitiatorFlow state: { amount: $10, lender: "O=ParticipantB, L=New York, C=GB", borrower: "O=ParticipantC, L=Paris, C=FR" }

This statement works with the Kotlin version of the corda-training-template but throws the following error in the Java version:

No matching constructor found:
- [net.corda.training.state.IOUState]: Could not parse as a command: Cannot construct instance of `net.corda.training.state.IOUState` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: UNKNOWN; line: -1, column: -1]

Although I am not using the default constructor, the default constructor should still be called by this():

@ConstructorForDeserialization
    public IOUState(Amount<Currency> amount, Party lender, Party borrower, UniqueIdentifier linearId){
        this.amount = amount;
        this.lender = lender;
        this.borrower = borrower;
        this.linearId = linearId;
    }

    public IOUState(Amount<Currency> amount, Party lender, Party borrower) {
        this(amount, lender, borrower, new UniqueIdentifier());
    }

What is the proper syntax to issue an IOU state in the corda-training-template?

[muhamadto]

hello,

I'm getting the same error

flow start IOUIssueFlow$InitiatorFlow arg0: {amount: $1000, lender: "O=Supplier Service,OU=coffeebeans,L=Sydney,C=AU", borrower: "O=Consumer Service,OU=coffeebeans,L=Sydney,C=AU"}

and response

No matching constructor found:
- [class com.coffeebeans.creditum.state.IOUState]: Could not parse as a command: Cannot construct instance of `com.coffeebeans.creditum.state.IOUState` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: UNKNOWN; line: -1, column: -1]

[muhamadto]

I found the issue with my code

Maven compiler plugin was defaulting to 3.1 which means that <maven.compiler.parameters>true</maven.compiler.parameters> was not picked up since this property was added only since version 3.6.2, check here

On Top of that, I had to change the IOUState constructor by making is json creator. The constructor now looks like this,

  @JsonCreator
  public IOUState(@JsonProperty("amount") final Amount<Currency> amount,
      @JsonProperty("lender") final Party lender,
      @JsonProperty("borrower") final Party borrower) {
    this(amount, lender, borrower, new Amount<>(0, amount.getToken()), new UniqueIdentifier());
  }

Now running the flow works

flow start IOUIssueFlow$InitiatorFlow state: {amount: $1000, lender: "O=Supplier Service,OU=coffeebeans,L=Sydney,C=AU", borrower: "O=Consumer Service,OU=coffeebeans,L=Sydney,C=AU"}

 ✓ Starting
          Requesting signature by notary service
              Requesting signature by Notary service
              Validating response from Notary service
     ✓ Broadcasting transaction to participants
▶︎ Done
Flow completed with result: SignedTransaction(id=8FDB7BBC182A0EDAF27CCBD958A9AC49057ED094B13B1957B07BAF3FFC045EE4)

Then querying the vault results in

Sun Jun 07 21:33:20 UTC 2020>>> run vaultQuery contractStateType: com.coffeebeans.creditum.state.IOUState
states:
- state:
    data: !<com.coffeebeans.creditum.state.IOUState>
      amount: "1000.00 USD"
      lender: "OU=coffeebeans, O=Supplier Service, L=Sydney, C=AU"
      borrower: "OU=coffeebeans, O=Consumer Service, L=Sydney, C=AU"
      paid: "0.00 USD"
      linearId:
        externalId: null
        id: "846828dd-b83e-410a-b144-4d955d2fddc7"
    contract: "com.coffeebeans.creditum.contract.IOUContract"
    notary: "OU=coffeebeans, O=Notary Service, L=Sydney, C=AU"
    encumbrance: null
    constraint: !<net.corda.core.contracts.HashAttachmentConstraint>
      attachmentId: "A97FC1D2E210A7BC8FE75705E29A5AF284245A3D5E7AC1D945D41D61D5EBACDB"
  ref:
    txhash: "8FDB7BBC182A0EDAF27CCBD958A9AC49057ED094B13B1957B07BAF3FFC045EE4"
    index: 0
statesMetadata:
- ref:
    txhash: "8FDB7BBC182A0EDAF27CCBD958A9AC49057ED094B13B1957B07BAF3FFC045EE4"
    index: 0
  contractStateClassName: "com.coffeebeans.creditum.state.IOUState"
  recordedTime: "2020-06-07T21:33:20.398Z"
  consumedTime: null
  status: "UNCONSUMED"
  notary: "OU=coffeebeans, O=Notary Service, L=Sydney, C=AU"
  lockId: null
  lockUpdateTime: null
  relevancyStatus: "RELEVANT"
  constraintInfo:
    constraint:
      attachmentId: "A97FC1D2E210A7BC8FE75705E29A5AF284245A3D5E7AC1D945D41D61D5EBACDB"
totalStatesAvailable: -1
stateTypes: "UNCONSUMED"
otherResults: []