Add message to uses of require(...) (#4192)

client/jackson/src/main/kotlin/net/corda/client/jackson/internal/CordaModule.kt

@@ -3,7 +3,7 @@
 package net.corda.client.jackson.internal
 
 import com.fasterxml.jackson.annotation.*
-import com.fasterxml.jackson.annotation.JsonCreator.Mode.*
+import com.fasterxml.jackson.annotation.JsonCreator.Mode.DISABLED
 import com.fasterxml.jackson.annotation.JsonInclude.Include
 import com.fasterxml.jackson.core.JsonGenerator
 import com.fasterxml.jackson.core.JsonParseException
@@ -38,7 +38,10 @@ import net.corda.core.utilities.NetworkHostAndPort
 import net.corda.core.utilities.parseAsHex
 import net.corda.core.utilities.toHexString
 import net.corda.serialization.internal.AllWhitelist
-import net.corda.serialization.internal.amqp.*
+import net.corda.serialization.internal.amqp.SerializerFactoryBuilder
+import net.corda.serialization.internal.amqp.constructorForDeserialization
+import net.corda.serialization.internal.amqp.hasCordaSerializable
+import net.corda.serialization.internal.amqp.propertiesForSerialization
 import java.math.BigDecimal
 import java.security.PublicKey
 import java.security.cert.CertPath
@@ -327,11 +330,11 @@ private class PartialTreeJson(val includedLeaf: SecureHash? = null,
                               val right: PartialTreeJson? = null) {
     init {
         if (includedLeaf != null) {
-            require(leaf == null && left == null && right == null)
+            require(leaf == null && left == null && right == null) { "Invalid JSON structure" }
         } else if (leaf != null) {
-            require(left == null && right == null)
+            require(left == null && right == null) { "Invalid JSON structure" }
         } else {
-            require(left != null && right != null)
+            require(left != null && right != null) { "Invalid JSON structure" }
         }
     }
 }

client/jfx/src/main/kotlin/net/corda/client/jfx/model/NodeMonitorModel.kt

@@ -202,7 +202,7 @@ class NodeMonitorModel : AutoCloseable {
                 val _connection = client.start(username, password)
                 // Check connection is truly operational before returning it.
                 val nodeInfo = _connection.proxy.nodeInfo()
-                require(nodeInfo.legalIdentitiesAndCerts.isNotEmpty())
+                require(nodeInfo.legalIdentitiesAndCerts.isNotEmpty()){"No identity certificates found"}
                 _connection
             } catch (exception: Exception) {
                 if (shouldRetry) {

common/validation/src/main/kotlin/net/corda/common/validation/internal/Validated.kt

@@ -126,7 +126,7 @@ interface Validated<TARGET, ERROR> {
          */
         class Unsuccessful<TARGET, ERROR>(override val errors: Set<ERROR>) : Result<TARGET, ERROR>(), Validated<TARGET, ERROR> {
             init {
-                require(errors.isNotEmpty())
+                require(errors.isNotEmpty()) { "No errors encountered during validation" }
             }
 
             override fun value(exceptionOnErrors: (Set<ERROR>) -> Exception) = throw exceptionOnErrors.invoke(errors)

core/src/main/kotlin/net/corda/core/crypto/CompositeKey.kt

@@ -40,14 +40,14 @@ class CompositeKey private constructor(val threshold: Int, children: List<NodeAn
 
         fun getInstance(asn1: ASN1Primitive): PublicKey {
             val keyInfo = SubjectPublicKeyInfo.getInstance(asn1)
-            require(keyInfo.algorithm.algorithm == CordaObjectIdentifier.COMPOSITE_KEY)
+            require(keyInfo.algorithm.algorithm == CordaObjectIdentifier.COMPOSITE_KEY) { "Key must be composite" }
             val sequence = ASN1Sequence.getInstance(keyInfo.parsePublicKey())
             val threshold = ASN1Integer.getInstance(sequence.getObjectAt(0)).positiveValue.toInt()
             val sequenceOfChildren = ASN1Sequence.getInstance(sequence.getObjectAt(1))
             val builder = Builder()
             val listOfChildren = sequenceOfChildren.objects.toList()
             listOfChildren.forEach { childAsn1 ->
-                require(childAsn1 is ASN1Sequence)
+                require(childAsn1 is ASN1Sequence) { "Child key is not in ASN1 format" }
                 val childSeq = childAsn1 as ASN1Sequence
                 val key = Crypto.decodePublicKey((childSeq.getObjectAt(0) as DERBitString).bytes)
                 val weight = ASN1Integer.getInstance(childSeq.getObjectAt(1))
@@ -274,7 +274,7 @@ class CompositeKey private constructor(val threshold: Int, children: List<NodeAn
          * is invalid (for example it would contain no keys).
          */
         fun build(threshold: Int? = null): PublicKey {
-            require(threshold == null || threshold > 0)
+            require(threshold == null || threshold > 0) { "Threshold must not be specified or its value must be greater than zero" }
             val n = children.size
             return when {
                 n > 1 -> CompositeKey(threshold ?: children.map { (_, weight) -> weight }.sum(), children)

core/src/main/kotlin/net/corda/core/crypto/SecureHash.kt

@@ -19,7 +19,7 @@ sealed class SecureHash(bytes: ByteArray) : OpaqueBytes(bytes) {
     /** SHA-256 is part of the SHA-2 hash function family. Generated hash is fixed size, 256-bits (32-bytes). */
     class SHA256(bytes: ByteArray) : SecureHash(bytes) {
         init {
-            require(bytes.size == 32)
+            require(bytes.size == 32) { "Invalid hash size, must be 32 bytes" }
         }
     }
 

core/src/main/kotlin/net/corda/core/crypto/internal/ProviderMap.kt

@@ -45,7 +45,7 @@ val cordaBouncyCastleProvider = BouncyCastleProvider().apply {
     Security.addProvider(it)
 }
 val bouncyCastlePQCProvider = BouncyCastlePQCProvider().apply {
-    require(name == "BCPQC") // The constant it comes from is not final.
+    require(name == "BCPQC") { "Invalid PQCProvider name" }
 }.also {
     Security.addProvider(it)
 }

core/src/main/kotlin/net/corda/core/internal/InternalUtils.kt

@@ -5,7 +5,10 @@ package net.corda.core.internal
 import net.corda.core.DeleteForDJVM
 import net.corda.core.KeepForDJVM
 import net.corda.core.crypto.*
-import net.corda.core.serialization.*
+import net.corda.core.serialization.SerializationDefaults
+import net.corda.core.serialization.SerializedBytes
+import net.corda.core.serialization.deserialize
+import net.corda.core.serialization.serialize
 import net.corda.core.utilities.OpaqueBytes
 import net.corda.core.utilities.UntrustworthyData
 import org.slf4j.Logger
@@ -109,7 +112,7 @@ fun <T> List<T>.randomOrNull(): T? {
 /** Returns the index of the given item or throws [IllegalArgumentException] if not found. */
 fun <T> List<T>.indexOfOrThrow(item: T): Int {
     val i = indexOf(item)
-    require(i != -1)
+    require(i != -1){"No such element"}
     return i
 }
 
@@ -219,7 +222,7 @@ data class InputStreamAndHash(val inputStream: InputStream, val sha256: SecureHa
          */
         @DeleteForDJVM
         fun createInMemoryTestZip(numOfExpectedBytes: Int, content: Byte): InputStreamAndHash {
-            require(numOfExpectedBytes > 0)
+            require(numOfExpectedBytes > 0){"Expected bytes must be greater than zero"}
             val baos = ByteArrayOutputStream()
             ZipOutputStream(baos).use { zos ->
                 val arraySize = 1024

core/src/main/kotlin/net/corda/core/internal/NamedCache.kt

@@ -14,8 +14,8 @@ interface NamedCacheFactory {
      * the name can be used to create a file name or a metric name.
      */
     fun checkCacheName(name: String) {
-        require(!name.isBlank())
-        require(allowedChars.matches(name))
+        require(!name.isBlank()){"Name must not be empty or only whitespace"}
+        require(allowedChars.matches(name)){"Invalid characters in cache name"}
     }
 
     fun <K, V> buildNamed(caffeine: Caffeine<in K, in V>, name: String): Cache<K, V>

core/src/main/kotlin/net/corda/core/internal/errors/AddressBindingException.kt

@@ -9,7 +9,7 @@ class AddressBindingException(val addresses: Set<NetworkHostAndPort>) : CordaRun
 
     private companion object {
         private fun message(addresses: Set<NetworkHostAndPort>): String {
-            require(addresses.isNotEmpty())
+            require(addresses.isNotEmpty()) { "Address list must not be empty" }
             return if (addresses.size > 1) {
                 "Failed to bind on an address in ${addresses.joinToString(", ", "[", "]")}."
             } else {

core/src/main/kotlin/net/corda/core/utilities/ByteArrays.kt

@@ -68,8 +68,8 @@ sealed class ByteSequence(private val _bytes: ByteArray, val offset: Int, val si
      * This method cannot be used to get bytes before [offset] or after [offset]+[size], and never makes a new array.
      */
     fun slice(start: Int = 0, end: Int = size): ByteBuffer {
-        require(start >= 0)
-        require(end >= 0)
+        require(start >= 0) { "Starting index must be greater than or equal to 0" }
+        require(end >= 0){"End index must be greater or equal to 0"}
         val clampedStart = min(start, size)
         val clampedEnd = min(end, size)
         return ByteBuffer.wrap(_bytes, offset + clampedStart, max(0, clampedEnd - clampedStart)).asReadOnlyBuffer()
@@ -155,7 +155,7 @@ open class OpaqueBytes(bytes: ByteArray) : ByteSequence(bytes, 0, bytes.size) {
     }
 
     init {
-        require(bytes.isNotEmpty())
+        require(bytes.isNotEmpty()) { "Byte Array must not be empty" }
     }
 
     /**
@@ -193,7 +193,7 @@ fun String.parseAsHex(): ByteArray = DatatypeConverter.parseHexBinary(this)
 @KeepForDJVM
 class OpaqueBytesSubSequence(override val bytes: ByteArray, offset: Int, size: Int) : ByteSequence(bytes, offset, size) {
     init {
-        require(offset >= 0 && offset < bytes.size)
-        require(size >= 0 && offset + size <= bytes.size)
+        require(offset >= 0 && offset < bytes.size) { "Offset must be greater than or equal to 0, and less than the size of the backing array" }
+        require(size >= 0 && offset + size <= bytes.size) { "Sub-sequence size must be greater than or equal to 0, and less than the size of the backing array" }
     }
 }

experimental/corda-utils/src/main/kotlin/io/cryptoblk/core/StatusTransitions.kt

@@ -67,7 +67,7 @@ class StatusTransitions<out S, in R, T : StatusTrackingContractState<S, R>>(priv
             // for each combination of in x out which should normally be at most 1...
             inputStates.forEach { inp ->
                 outputStates.forEach { outp ->
-                    require(inp != null || outp != null)
+                    require(inp != null || outp != null) { "Input and output states cannot be both left unspecified" }
                     val options = matchingTransitions(inp?.status, outp?.status, cmd.value)
 
                     val signerGroup = options.groupBy { it.signer }.entries.singleOrNull()

experimental/src/main/kotlin/net/corda/finance/contracts/universal/UniversalContract.kt

@@ -203,7 +203,7 @@ class UniversalContract : Contract {
                 val rest = extractRemainder(arr, action)
 
                 // for now - let's assume not
-                require(rest is Zero)
+                require(rest is Zero) { "Remainder must be zero" }
 
                 requireThat {
                     "action must have a time-window" using (tx.timeWindow != null)

finance/src/main/kotlin/net/corda/finance/contracts/FinanceTypes.kt

@@ -321,7 +321,7 @@ open class BusinessCalendar(val holidayDates: List<LocalDate>) {
      * TODO: Make more efficient if necessary
      */
     fun moveBusinessDays(date: LocalDate, direction: DateRollDirection, i: Int): LocalDate {
-        require(i >= 0)
+        require(i >= 0){"Days to add/subtract must be positive"}
         if (i == 0) return date
         var retDate = date
         var ctr = 0

finance/src/main/kotlin/net/corda/finance/contracts/GetBalances.kt

@@ -39,8 +39,8 @@ private fun rowsToAmount(currency: Currency, rows: Vault.Page<FungibleAsset<*>>)
     return if (rows.otherResults.isEmpty()) {
         Amount(0L, currency)
     } else {
-        require(rows.otherResults.size == 2)
-        require(rows.otherResults[1] == currency.currencyCode)
+        require(rows.otherResults.size == 2){"Invalid number of rows returned by query"}
+        require(rows.otherResults[1] == currency.currencyCode){"Currency on rows returned by query does not match expected"}
         val quantity = rows.otherResults[0] as Long
         Amount(quantity, currency)
     }

finance/src/main/kotlin/net/corda/finance/contracts/asset/OnLedgerAsset.kt

@@ -298,7 +298,7 @@ abstract class OnLedgerAsset<T : Any, out C : CommandData, S : FungibleAsset<T>>
                                                           issueCommand: CommandData): Set<PublicKey> {
             check(tx.inputStates().isEmpty())
             check(tx.outputStates().map { it.data }.filterIsInstance(transactionState.javaClass).isEmpty())
-            require(transactionState.data.amount.quantity > 0)
+            require(transactionState.data.amount.quantity > 0){"Amount to issue must be greater than zero"}
             val at = transactionState.data.amount.token.issuer
             val commandSigner = at.party.owningKey
             tx.addOutputState(transactionState)

finance/src/main/kotlin/net/corda/finance/flows/TwoPartyDealFlow.kt

@@ -140,8 +140,8 @@ object TwoPartyDealFlow {
                 // Verify the transaction identities represent the correct parties
                 val wellKnownOtherParty = serviceHub.identityService.wellKnownPartyFromAnonymous(it.primaryIdentity)
                 val wellKnownMe = serviceHub.identityService.wellKnownPartyFromAnonymous(it.secondaryIdentity)
-                require(wellKnownOtherParty == otherSideSession.counterparty)
-                require(wellKnownMe == ourIdentity)
+                require(wellKnownOtherParty == otherSideSession.counterparty){"Well known party for handshake identity ${it.primaryIdentity} does not match counterparty"}
+                require(wellKnownMe == ourIdentity){"Well known party for handshake identity ${it.secondaryIdentity} does not match ourIdentity"}
                 validateHandshake(it)
             }
         }

finance/src/main/kotlin/net/corda/finance/flows/TwoPartyTradeFlow.kt

@@ -203,7 +203,7 @@ object TwoPartyTradeFlow {
                 // The asset must either be owned by the well known identity of the counterparty, or we must be able to
                 // prove the owner is a confidential identity of the counterparty.
                 val assetForSaleIdentity = serviceHub.identityService.wellKnownPartyFromAnonymous(asset.owner)
-                require(assetForSaleIdentity == sellerSession.counterparty)
+                require(assetForSaleIdentity == sellerSession.counterparty){"Well known identity lookup returned identity that does not match counterparty"}
 
                 // Register the identity we're about to send payment to. This shouldn't be the same as the asset owner
                 // identity, so that anonymity is enforced.

finance/src/main/kotlin/net/corda/finance/utils/PhysicalLocationStructures.kt

@@ -9,8 +9,8 @@ data class ScreenCoordinate(val screenX: Double, val screenY: Double)
 @CordaSerializable
 data class WorldCoordinate(val latitude: Double, val longitude: Double) {
     init {
-        require(latitude in -90..90)
-        require(longitude in -180..180)
+        require(latitude in -90..90){"Latitude must be between -90 and +90"}
+        require(longitude in -180..180){"Longitude must be between -180 and +180"}
     }
 
     /**
@@ -24,8 +24,8 @@ data class WorldCoordinate(val latitude: Double, val longitude: Double) {
     @Suppress("unused") // Used from the visualiser GUI.
     fun project(screenWidth: Double, screenHeight: Double, topLatitude: Double, bottomLatitude: Double,
                 leftLongitude: Double, rightLongitude: Double): ScreenCoordinate {
-        require(latitude in bottomLatitude..topLatitude)
-        require(longitude in leftLongitude..rightLongitude)
+        require(latitude in bottomLatitude..topLatitude){"Latitude must be between $bottomLatitude and $topLatitude"}
+        require(longitude in leftLongitude..rightLongitude){"Longitude must be between $leftLongitude and $rightLongitude"}
 
         fun deg2rad(deg: Double) = deg * Math.PI / 180.0
         val leftLngRad = deg2rad(leftLongitude)

node-api/src/main/kotlin/net/corda/nodeapi/internal/DevIdentityGenerator.kt

@@ -47,7 +47,7 @@ object DevIdentityGenerator {
 
     /** Generates a CFT notary identity, where the entire cluster shares a key pair. */
     fun generateDistributedNotarySingularIdentity(dirs: List<Path>, notaryName: CordaX500Name): Party {
-        require(dirs.isNotEmpty())
+        require(dirs.isNotEmpty()){"At least one directory to generate identity for must be specified"}
 
         log.trace { "Generating singular identity \"$notaryName\" for nodes: ${dirs.joinToString()}" }
 
@@ -63,7 +63,7 @@ object DevIdentityGenerator {
 
     /** Generates a BFT notary identity: individual key pairs for each cluster member, and a shared composite key. */
     fun generateDistributedNotaryCompositeIdentity(dirs: List<Path>, notaryName: CordaX500Name, threshold: Int = 1): Party {
-        require(dirs.isNotEmpty())
+        require(dirs.isNotEmpty()){"At least one directory to generate identity for must be specified"}
 
         log.trace { "Generating composite identity \"$notaryName\" for nodes: ${dirs.joinToString()}" }
 

node-api/src/main/kotlin/net/corda/nodeapi/internal/crypto/X509Utilities.kt

@@ -254,7 +254,7 @@ object X509Utilities {
                           crlIssuer: X500Name? = null): X509Certificate {
         val builder = createPartialCertificate(certificateType, issuer, issuerPublicKey, subject, subjectPublicKey, validityWindow, nameConstraints, crlDistPoint, crlIssuer)
         return builder.build(issuerSigner).run {
-            require(isValidOn(Date()))
+            require(isValidOn(Date())){"Certificate is not valid at instant now"}
             toJca()
         }
     }
@@ -292,8 +292,8 @@ object X509Utilities {
                 crlDistPoint,
                 crlIssuer)
         return builder.build(signer).run {
-            require(isValidOn(Date()))
-            require(isSignatureValid(JcaContentVerifierProviderBuilder().build(issuerKeyPair.public)))
+            require(isValidOn(Date())){"Certificate is not valid at instant now"}
+            require(isSignatureValid(JcaContentVerifierProviderBuilder().build(issuerKeyPair.public))){"Invalid signature"}
             toJca()
         }
     }

node/src/main/kotlin/net/corda/node/internal/artemis/ReactiveArtemisConsumer.kt

@@ -39,7 +39,7 @@ private class MultiplexingReactiveArtemisConsumer(private val queueNames: Set<St
     override fun start() {
 
         synchronized(this) {
-            require(!startedFlag)
+            require(!startedFlag) { "Must not be started" }
             connect()
             startedFlag = true
         }
@@ -59,7 +59,7 @@ private class MultiplexingReactiveArtemisConsumer(private val queueNames: Set<St
     override fun connect() {
 
         synchronized(this) {
-            require(!connected)
+            require(!connected) { "Must not be connected" }
             queueNames.forEach { queue ->
                 createSession().apply {
                     start()

node/src/main/kotlin/net/corda/node/serialization/kryo/Kryo.kt

@@ -72,8 +72,9 @@ class ImmutableClassSerializer<T : Any>(val klass: KClass<T>) : Serializer<T>()
     val constructor = klass.primaryConstructor!!
 
     init {
-        // Verify that this class is immutable (all properties are final)
-        require(props.none { it is KMutableProperty<*> })
+        props.forEach {
+            require(it !is KMutableProperty<*>) { "$it mutable property of class: ${klass} is unsupported" }
+        }
     }
 
     // Just a utility to help us catch cases where nodes are running out of sync versions.

node/src/main/kotlin/net/corda/node/services/config/NodeConfiguration.kt

@@ -265,8 +265,8 @@ data class SecurityConfiguration(val authService: SecurityConfiguration.AuthServ
                               val users: List<User>? = null) {
             init {
                 when (type) {
-                    AuthDataSourceType.INMEMORY -> require(users != null && connection == null)
-                    AuthDataSourceType.DB -> require(users == null && connection != null)
+                    AuthDataSourceType.INMEMORY -> require(users != null && connection == null) { "In-memory authentication must specify a user list, and must not configure a database" }
+                    AuthDataSourceType.DB -> require(users == null && connection != null) { "Database-backed authentication must not specify a user list, and must configure a database" }
                 }
             }
 

node/src/main/kotlin/net/corda/node/services/messaging/P2PMessagingClient.kt

@@ -569,7 +569,7 @@ private class P2PMessagingConsumer(
     override fun start() {
 
         synchronized(this) {
-            require(!startedFlag)
+            require(!startedFlag){"Must not already be started"}
             drainingModeWasChangedEvents.filter { change -> change.switchedOn() }.doOnNext { initialAndExistingConsumer.switchTo(existingOnlyConsumer) }.subscribe()
             drainingModeWasChangedEvents.filter { change -> change.switchedOff() }.doOnNext { existingOnlyConsumer.switchTo(initialAndExistingConsumer) }.subscribe()
             subscriptions += existingOnlyConsumer.messages.doOnNext(messages::onNext).subscribe()

node/src/main/kotlin/net/corda/node/services/messaging/RPCServer.kt

@@ -253,7 +253,7 @@ class RPCServer(
     private fun bindingRemovalArtemisMessageHandler(artemisMessage: ClientMessage) {
         lifeCycle.requireState(State.STARTED)
         val notificationType = artemisMessage.getStringProperty(ManagementHelper.HDR_NOTIFICATION_TYPE)
-        require(notificationType == CoreNotificationType.BINDING_REMOVED.name)
+        require(notificationType == CoreNotificationType.BINDING_REMOVED.name){"Message contained notification type of $notificationType instead of expected ${CoreNotificationType.BINDING_REMOVED.name}"}
         val clientAddress = artemisMessage.getStringProperty(ManagementHelper.HDR_ROUTING_NAME)
         log.warn("Detected RPC client disconnect on address $clientAddress, scheduling for reaping")
         invalidateClient(SimpleString(clientAddress))
@@ -262,7 +262,7 @@ class RPCServer(
     private fun bindingAdditionArtemisMessageHandler(artemisMessage: ClientMessage) {
         lifeCycle.requireState(State.STARTED)
         val notificationType = artemisMessage.getStringProperty(ManagementHelper.HDR_NOTIFICATION_TYPE)
-        require(notificationType == CoreNotificationType.BINDING_ADDED.name)
+        require(notificationType == CoreNotificationType.BINDING_ADDED.name){"Message contained notification type of $notificationType instead of expected ${CoreNotificationType.BINDING_ADDED.name}"}
         val clientAddress = SimpleString(artemisMessage.getStringProperty(ManagementHelper.HDR_ROUTING_NAME))
         log.debug("RPC client queue created on address $clientAddress")
 

node/src/main/kotlin/net/corda/node/services/persistence/NodeAttachmentService.kt

@@ -300,7 +300,7 @@ class NodeAttachmentService(
     private fun import(jar: InputStream, uploader: String?, filename: String?): AttachmentId {
         return database.transaction {
             withContractsInJar(jar) { contractClassNames, inputStream ->
-                require(inputStream !is JarInputStream)
+                require(inputStream !is JarInputStream){"Input stream must not be a JarInputStream"}
 
                 // Read the file into RAM and then calculate its hash. The attachment must fit into memory.
                 // TODO: Switch to a two-phase insert so we can handle attachments larger than RAM.

node/src/main/kotlin/net/corda/node/services/statemachine/CountUpDownLatch.kt

@@ -1,7 +1,7 @@
 package net.corda.node.services.statemachine
 
-import co.paralleluniverse.strands.concurrent.AbstractQueuedSynchronizer
 import co.paralleluniverse.fibers.Suspendable
+import co.paralleluniverse.strands.concurrent.AbstractQueuedSynchronizer
 
 /**
  * Quasar-compatible latch that may be incremented.
@@ -56,7 +56,7 @@ class CountUpDownLatch(initialValue: Int) {
     }
 
     fun countDown(number: Int = 1) {
-        require(number > 0)
+        require(number > 0){"Number to count down by must be greater than 0"}
         sync.releaseShared(number)
     }
 

node/src/main/kotlin/net/corda/node/services/statemachine/FlowStateMachineImpl.kt

@@ -193,7 +193,7 @@ class FlowStateMachineImpl<R>(override val id: StateMachineRunId,
                 "Transaction context is missing. This might happen if a suspendable method is not annotated with @Suspendable annotation."
             }
         } else {
-            require(contextTransactionOrNull == null)
+            require(contextTransactionOrNull == null){"Transaction is marked as not present, but is not null"}
         }
     }
 
@@ -388,7 +388,7 @@ class FlowStateMachineImpl<R>(override val id: StateMachineRunId,
                     isDbTransactionOpenOnEntry = true,
                     isDbTransactionOpenOnExit = false
             )
-            require(continuation == FlowContinuation.ProcessEvents)
+            require(continuation == FlowContinuation.ProcessEvents){"Expected a continuation of type ${FlowContinuation.ProcessEvents}, found $continuation "}
             unpark(SERIALIZER_BLOCKER)
         }
         return uncheckedCast(processEventsUntilFlowIsResumed(

node/src/main/kotlin/net/corda/node/services/statemachine/SingleThreadedStateMachineManager.kt

@@ -172,7 +172,7 @@ class SingleThreadedStateMachineManager(
      * @param allowedUnsuspendedFiberCount Optional parameter is used in some tests.
      */
     override fun stop(allowedUnsuspendedFiberCount: Int) {
-        require(allowedUnsuspendedFiberCount >= 0)
+        require(allowedUnsuspendedFiberCount >= 0){"allowedUnsuspendedFiberCount must be greater than or equal to zero"}
         mutex.locked {
             if (stopping) throw IllegalStateException("Already stopping!")
             stopping = true
@@ -775,10 +775,10 @@ class SingleThreadedStateMachineManager(
     ) {
         drainFlowEventQueue(flow)
         // final sanity checks
-        require(lastState.pendingDeduplicationHandlers.isEmpty())
-        require(lastState.isRemoved)
-        require(lastState.checkpoint.subFlowStack.size == 1)
-        require(flow.fiber.id !in sessionToFlow.values)
+        require(lastState.pendingDeduplicationHandlers.isEmpty()) { "Flow cannot be removed until all pending deduplications have completed" }
+        require(lastState.isRemoved) { "Flow must be in removable state before removal" }
+        require(lastState.checkpoint.subFlowStack.size == 1) { "Checkpointed stack must be empty" }
+        require(flow.fiber.id !in sessionToFlow.values) { "Flow fibre must not be needed by an existing session" }
         flow.resultFuture.set(removalReason.flowReturnValue)
         lastState.flowLogic.progressTracker?.currentStep = ProgressTracker.DONE
         changesPublisher.onNext(StateMachineManager.Change.Removed(lastState.flowLogic, Try.Success(removalReason.flowReturnValue)))

node/src/main/kotlin/net/corda/node/services/statemachine/interceptors/FiberDeserializationCheckingInterceptor.kt

@@ -2,17 +2,11 @@ package net.corda.node.services.statemachine.interceptors
 
 import co.paralleluniverse.fibers.Suspendable
 import net.corda.core.flows.StateMachineRunId
-import net.corda.core.serialization.*
+import net.corda.core.serialization.SerializedBytes
 import net.corda.core.serialization.internal.CheckpointSerializationContext
 import net.corda.core.serialization.internal.checkpointDeserialize
 import net.corda.core.utilities.contextLogger
-import net.corda.node.services.statemachine.ActionExecutor
-import net.corda.node.services.statemachine.Event
-import net.corda.node.services.statemachine.FlowFiber
-import net.corda.node.services.statemachine.FlowState
-import net.corda.node.services.statemachine.FlowStateMachineImpl
-import net.corda.node.services.statemachine.StateMachineState
-import net.corda.node.services.statemachine.TransitionExecutor
+import net.corda.node.services.statemachine.*
 import net.corda.node.services.statemachine.transitions.FlowContinuation
 import net.corda.node.services.statemachine.transitions.TransitionResult
 import java.util.concurrent.LinkedBlockingQueue
@@ -69,7 +63,7 @@ class FiberDeserializationChecker {
     private var foundUnrestorableFibers: Boolean = false
 
     fun start(checkpointSerializationContext: CheckpointSerializationContext) {
-        require(checkerThread == null)
+        require(checkerThread == null){"Checking thread must not already be started"}
         checkerThread = thread(name = "FiberDeserializationChecker") {
             while (true) {
                 val job = jobQueue.take()

node/src/main/kotlin/net/corda/node/utilities/registration/NetworkRegistrationHelper.kt

@@ -372,7 +372,7 @@ class NodeRegistrationHelper(
 private class FixedPeriodLimitedRetrialStrategy(times: Int, private val period: Duration) : (Duration?) -> Duration? {
 
     init {
-        require(times > 0)
+        require(times > 0){"Retry attempts must be larger than zero"}
     }
 
     private var counter = times

samples/attachment-demo/src/main/kotlin/net/corda/attachmentdemo/AttachmentDemo.kt

@@ -94,7 +94,7 @@ private fun sender(rpc: CordaRPCOps, inputStream: InputStream, hash: SecureHash.
             val id = rpc.uploadAttachment(it)
             require(hash == id) { "Id was '$id' instead of '$hash'" }
         }
-        require(rpc.attachmentExists(hash))
+        require(rpc.attachmentExists(hash)){"Attachment matching hash: $hash does not exist"}
     }
 
     val flowHandle = rpc.startTrackedFlow(::AttachmentDemoFlow, otherSideFuture.get(), notaryFuture.get(), hash)
@@ -159,7 +159,7 @@ fun recipient(rpc: CordaRPCOps, webPort: Int) {
     if (wtx.attachments.isNotEmpty()) {
         if (wtx.outputs.isNotEmpty()) {
             val state = wtx.outputsOfType<AttachmentContract.State>().single()
-            require(rpc.attachmentExists(state.hash))
+            require(rpc.attachmentExists(state.hash)) {"attachment matching hash: ${state.hash} does not exist"}
 
             // Download the attachment via the Web endpoint.
             val connection = URL("http://localhost:$webPort/attachments/${state.hash}").openConnection() as HttpURLConnection
@@ -207,7 +207,7 @@ class AttachmentContract : Contract {
     override fun verify(tx: LedgerTransaction) {
         val state = tx.outputsOfType<AttachmentContract.State>().single()
         // we check that at least one has the matching hash, the other will be the contract
-        require(tx.attachments.any { it.id == state.hash })
+        require(tx.attachments.any { it.id == state.hash }) {"At least one attachment in transaction must match hash ${state.hash}"}
     }
 
     object Command : TypeOnlyCommandData()

samples/simm-valuation-demo/contracts-states/src/main/kotlin/net/corda/vega/contracts/PortfolioState.kt

@@ -40,7 +40,7 @@ data class PortfolioState(val portfolio: List<StateRef>,
     }
 
     override fun generateRevision(notary: Party, oldState: StateAndRef<*>, updatedValue: Update): TransactionBuilder {
-        require(oldState.state.data == this)
+        require(oldState.state.data == this){"Old state data does not match current state data"}
         val portfolio = updatedValue.portfolio ?: portfolio
         val valuation = updatedValue.valuation ?: valuation
 

serialization/src/main/kotlin/net/corda/serialization/internal/carpenter/ClassCarpenter.kt

@@ -148,7 +148,9 @@ class ClassCarpenterImpl @JvmOverloads constructor (override val whitelist: Clas
             }
         }
 
-        require(schema.name in _loaded)
+        if (schema.name !in _loaded){
+            throw ClassNotFoundException(schema.name)
+        }
 
         return _loaded[schema.name]!!
     }

serialization/src/main/kotlin/net/corda/serialization/internal/carpenter/MetaCarpenter.kt

@@ -83,6 +83,7 @@ abstract class MetaCarpenterBase(val schemas: CarpenterMetaSchema, val cc: Class
         // carpented class existing and remove it from their dependency list, If that
         // list is now empty we have no impediment to carpenting that class up
         schemas.dependsOn.remove(newObject.name)?.forEach { dependent ->
+
             require(newObject.name in schemas.dependencies[dependent]!!.second)
 
             schemas.dependencies[dependent]?.second?.remove(newObject.name)

serialization/src/main/kotlin/net/corda/serialization/internal/carpenter/SchemaFields.kt

@@ -72,8 +72,7 @@ open class NonNullableField(field: Class<out Any?>) : ClassField(field) {
     }
 
     override fun nullTest(mv: MethodVisitor, slot: Int) {
-        require(name != unsetName)
-
+        check(name != unsetName) {"Property this.name cannot be $unsetName"}
         if (!field.isPrimitive) {
             with(mv) {
                 visitVarInsn(ALOAD, 0) // load this
@@ -109,7 +108,7 @@ class NullableField(field: Class<out Any?>) : ClassField(field) {
     }
 
     override fun nullTest(mv: MethodVisitor, slot: Int) {
-        require(name != unsetName)
+        require(name != unsetName){"Property this.name cannot be $unsetName"}
     }
 }
 

testing/test-utils/src/main/kotlin/net/corda/testing/contracts/DummyContract.kt

@@ -79,7 +79,7 @@ data class DummyContract(val blank: Any? = null) : Contract {
          */
         @JvmStatic
         fun move(priors: List<StateAndRef<SingleOwnerState>>, newOwner: AbstractParty): TransactionBuilder {
-            require(priors.isNotEmpty())
+            require(priors.isNotEmpty()){"States to move to new owner must not be empty"}
             val priorState = priors[0].state.data
             val (cmd, state) = priorState.withNewOwner(newOwner)
             return TransactionBuilder(notary = priors[0].state.notary).withItems(