Resolving Linear Pointer is throwing error - blockchain

Question

I was trying to use LinearPointer in my Application.When I was trying to resolve the state data where I want the unconsumed latest version,it is throwing Illegal Argument Exception.I am adding the logs.
{actor_id=internalShell, actor_owning_identity=O=PartyB, L=Tokyo, C=JP, actor_store_id=NODE_CONFIG, fiber-id=10000004, flow-id=56a4acbd-971f-4e79-8b89-314a910de58a, invocation_id=b191db29-3ad2-4276-9136-217269398148, invocation_timestamp=2020-09-25T12:29:40.292Z, origin=internalShell, session_id=99a63055-16d6-4515-82e4-145399148cae, session_timestamp=2020-09-25T12:28:11.858Z, thread-id=160}
[WARN ] 2020-09-25T12:29:40,533Z [Node thread-1] interceptors.DumpHistoryOnErrorInterceptor. - Flow [56a4acbd-971f-4e79-8b89-314a910de58a] error - List has more than one element. [errorCode=1af3t2i, moreInformationAt=https://errors.corda.net/OS/4.5/1af3t2i] {actor_id=internalShell, actor_owning_identity=O=PartyB, L=Tokyo, C=JP, actor_store_id=NODE_CONFIG, fiber-id=10000004, flow-id=56a4acbd-971f-4e79-8b89-314a910de58a, invocation_id=b191db29-3ad2-4276-9136-217269398148, invocation_timestamp=2020-09-25T12:29:40.292Z, origin=internalShell, session_id=99a63055-16d6-4515-82e4-145399148cae, session_timestamp=2020-09-25T12:28:11.858Z, thread-id=160}
java.lang.IllegalArgumentException: List has more than one element.
at kotlin.collections.CollectionsKt___CollectionsKt.single(_Collections.kt:480) ~[kotlin-stdlib-1.2.71.jar:1.2.71-release-64 (1.2.71)]
at net.corda.core.contracts.LinearPointer.resolve(StatePointer.kt:197) ~[corda-core-4.5.jar:?]
at statePointer.example.flows.UpdateVehicleFlow.call(UpdateVehicleFlow.kt:44) ~[?:?]
at statePointer.example.flows.UpdateVehicleFlow.call(UpdateVehicleFlow.kt:28) ~[?:?]
at net.corda.node.services.statemachine.FlowStateMachineImpl.run(FlowStateMachineImpl.kt:299) ~[corda-node-4.5.jar:?]
at net.corda.node.services.statemachine.FlowStateMachineImpl.run(FlowStateMachineImpl.kt:66) ~[corda-node-4.5.jar:?]
at co.paralleluniverse.fibers.Fiber.run1(Fiber.java:1092) ~[quasar-core-0.7.12_r3-jdk8.jar:0.7.12_r3]
at co.paralleluniverse.fibers.Fiber.exec(Fiber.java:788) ~[quasar-core-0.7.12_r3-jdk8.jar:0.7.12_r3]
at co.paralleluniverse.fibers.RunnableFiberTask.doExec(RunnableFiberTask.java:100) ~[quasar-core-0.7.12_r3-jdk8.jar:0.7.12_r3]
at co.paralleluniverse.fibers.RunnableFiberTask.run(RunnableFiberTask.java:91) ~[quasar-core-0.7.12_r3-jdk8.jar:0.7.12_r3]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) ~[?:1.8.0_201]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) ~[?:1.8.0_201]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) ~[?:1.8.0_201]
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) ~[?:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) ~[?:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) ~[?:1.8.0_201]
at net.corda.node.utilities.AffinityExecutor$ServiceAffinityExecutor$1$thread$1.run(AffinityExecutor.kt:63) ~[corda-node-4.5.jar:?]
The code that I was trying is ,
val queryCriteria = QueryCriteria.LinearStateQueryCriteria(
null,
listOf(vehicleState!!.state.data.serviceStationDynamic.resolve(serviceHub).state.data.linearId.id),
null, Vault.StateStatus.UNCONSUMED)
// Use the vaultQuery with the previously created queryCriteria to fetch the ServiceStation to be used as input
// in the transaction.
val serviceStationStateAndRef = serviceHub.vaultService.queryBy<ServiceStation>(queryCriteria).states.singleOrNull()
val chargeFromDynamicPointer=serviceStationStateAndRef!!.state.data.serviceCharge

Answer 1

The linearId of a LinearState is supposed to be unique for a particular state throughout its evolution. It means that when a linear state evolves all the historic states of it should share the same linearId. However, it needs to be unique for different linear states.
The error message suggests that you have more than one linear state with the same linearId, which is why resolve is failing.