IllegalFlowLogicException: A FlowLogicRef cannot be constructed for FlowLogic

问题

In my Corda I am trying to call a flow using RPC but I am getting this error while making the call to initiate the flow:

net.corda.core.flows.IllegalFlowLogicException: A FlowLogicRef cannot be constructed for FlowLogic of type com.example.flow.PolicyFlow$Initiator: due to missing constructor for arguments: [class com.example.state.PolicyState]

My Flow is shown in the snippet below:

 public SignedTransaction call() throws FlowException {
        class SignTxFlow extends SignTransactionFlow {
            private SignTxFlow(FlowSession otherPartyFlow, ProgressTracker progressTracker) {
                super(otherPartyFlow, progressTracker);
            }

            @Override
            protected void checkTransaction(SignedTransaction stx) {
                requireThat(require -> {
                    ContractState output = stx.getTx().getOutputs().get(0).getData();
                    require.using("This must be an Policy transaction.", output instanceof PolicyState);
                    PolicyState policy = (PolicyState) output;
                    require.using("I won't accept Policy without a first Name.", (!(policy.getFirstName().equals(""))));
                    return null;
                });
            }
        }

        return subFlow(new SignTxFlow(otherPartyFlow, SignTransactionFlow.Companion.tracker()));
    }

The Function for RPC Connection and initiating the flow is given below:

Can someone help me with this?

回答1:

Please check the constructor of PolicyFlow$Initiator Class there is a mismatch in constructor: you are sending policy but the constructor expects something else as I can see in code you provided in comments. there is no constructor in that class that accepts a policy state. You've a constructor with 10 fields.

来源：https://stackoverflow.com/questions/52054813/illegalflowlogicexception-a-flowlogicref-cannot-be-constructed-for-flowlogic