missing parameter name at index 0 {}

问题

I try to write a demo - deliverydemo base on bootcamp-cordapp and refer cordapp-example for my own Order Flow. After Party A-C and Notary started by command "build/nodes/runnodes":

TokenIssueFlow is worked.
I can saw my Order Flow by "flow list" command in CLI. But got "missing parameter name at index 0 {}" when try to start my order flow.

Thu Jul 26 09:41:51 CST 2018>>> flow start OrderPlaceFlow$OrderPlaceRequestFlow buyer: PartyB, seller: PartyC, sellingPrice: 12.9, downPayments: 0.1 flow start OrderPlaceFlow$OrderPlaceRequestFlow buyer: PartyB, seller: PartyC, sellingPrice: 12.9, downPayments: 0.1: exception: Could not parse as a command: Method lambda$call$6 missing parameter name at index 0 Thu Jul 26 09:41:55 CST 2018>>> E 09:41:55+0800 [pool-8-thread-8] command.CRaSHSession.execute - Error while evaluating request 'flow start OrderPlaceFlow$OrderPlaceRequestFlow buyer: PartyB, seller: PartyC, sellingPrice: 12.9, downPayments: 0.1' flow start OrderPlaceFlow$OrderPlaceRequestFlow buyer: PartyB, seller: PartyC, sellingPrice: 12.9, downPayments: 0.1: exception: Could not parse as a command: Method lambda$call$6 missing parameter name at index 0 {} net.corda.client.jackson.StringToMethodCallParser$UnparseableCallException$ReflectionDataMissing: Could not parse as a command: Method lambda$call$6 missing parameter name at index 0 at net.corda.client.jackson.StringToMethodCallParser.paramNamesFromMethod(StringToMethodCallParser.kt:131) ~[corda-jackson-corda-3.0.jar:?]

Thu Jul 26 09:38:32 CST 2018>>> flow list com.cienet.deliverydemo.order.OrderPlaceFlow$OrderPlaceRequestFlow com.cienet.deliverydemo.token.TokenIssueFlow net.corda.core.flows.ContractUpgradeFlow$Authorise net.corda.core.flows.ContractUpgradeFlow$Deauthorise net.corda.core.flows.ContractUpgradeFlow$Initiate

Thu Jul 26 09:38:34 CST 2018>>>

public OrderPlaceRequestFlow(Party buyer, Party seller, float sellingPrice, float downPayments) {
    this.buyer = buyer;
    this.seller = seller;
    this.sellingPrice = sellingPrice;
    this.downPayments = downPayments;
}

回答1:

I still do not know why, but that is working after build clean and re-build by:

./gradlew clean
./gradlew test
./gradlew deployNodesJava -Poffline=true

回答2:

Sometimes, that is a re-build issue. But, if you are using JAVA for a flow, and using session send/receive/unwarp, this error will rise. And not happen in Kotlin code.

EDIT:

I add a Kotlin code just for sending/receiving StateAndRef.

class TokenAsk(private val otherPartyFlow: FlowSession) {

@Suspendable
fun askTokenState(amount: Int, owner: Party): StateAndRef<TokenState> {
    otherPartyFlow.send(amount)
    otherPartyFlow.send(owner)
    return otherPartyFlow.receive<StateAndRef<TokenState>>().unwrap { it }
}

@Suspendable
fun receiveAmount(): Int =
    otherPartyFlow.receive<Int>().unwrap{it}

@Suspendable
fun receiveOwner(): Party =
        otherPartyFlow.receive<Party>().unwrap{it}

@Suspendable
fun sendStateAndRef(tokenStateAndRef: StateAndRef<TokenState>) =
    otherPartyFlow.send(tokenStateAndRef)

}

** EDIT 2 **

I faced this error again, when I am using Kotlin code. I have to remove the "private" key word in the constructor of a Flow for avoiding this error.

From:

class Initiator(private val number: String, private val otherParty: Party) : FlowLogic<SignedTransaction>()

To:

class Initiator(val number: String, val otherParty: Party) : FlowLogic<SignedTransaction>()

来源：https://stackoverflow.com/questions/51529864/missing-parameter-name-at-index-0

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corda