I need to receive region_name by region_code from Oracle DB
I use Exposed for my program, but I receive error
in thread "main" java.lang.AbstractMethodError
at org.jetbrains.exposed.sql.Transaction.closeExecutedStatements(Transaction.kt:181)
at org.jetbrains.exposed.sql.transactions.ThreadLocalTransactionManagerKt.inTopLevelTransaction(ThreadLocalTransactionManager.kt:137)
at org.jetbrains.exposed.sql.transactions.ThreadLocalTransactionManagerKt.transaction(ThreadLocalTransactionManager.kt:75)
Code is
object Codes : Table("REGIONS") {
val region_code = varchar("region_code",32)
val region_name = varchar("region_name",32)}
The main fun contains
.......
val conn = Database.connect("jdbc:oracle:thin:#//...", driver = "oracle.jdbc.OracleDriver",
user = "...", password = "...")
transaction(java.sql.Connection.TRANSACTION_READ_COMMITTED, 1, conn) {
addLogger(StdOutSqlLogger)
Codes.select { Codes.region_code eq "a" }.limit(1).forEach {
print(it[Codes.region_name])
}
}
AbstractMethodError usually means that you compiled the code with one version of a library, but are running it against a different (incompatible) version. (See for example these questions.)
So I'd check your dependencies &c carefully.
Related
This code is pulled directly off of the Kotlin-Exposed Wiki yet does not work. Strange and frustrating that I cannot get it to work since I have an idea for a cool project which requires using a RDBMS. What am I missing? Is it broken?
import org.jetbrains.exposed.sql.StdOutSqlLogger
import org.jetbrains.exposed.sql.Database
import org.jetbrains.exposed.sql.Table
import org.jetbrains.exposed.sql.insert
import org.jetbrains.exposed.sql.transactions.transaction
import org.jetbrains.exposed.sql.selectAll
fun main(args: Array<String>) {
Database.connect("jdbc:h2:mem:test", driver = "org.h2.Driver")
transaction {
logger.addLogger(StdOutSqlLogger)
val stPeteId = Cities.insert {
it[name] = "St. Petersburg"
} get Cities.id
println("Cities: ${Cities.selectAll()}")
}
}
// Table definition
object Cities : Table() {
val id = integer("id").autoIncrement().primaryKey()
val name = varchar("name", 50)
}
// Entity definition
data class City(
val id: Int,
val name: String
)
When run in Intellij, I recieve this error message:
SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
Exception in thread "main" org.h2.jdbc.JdbcSQLException: Table "CITIES" not found; SQL statement:
INSERT INTO CITIES (NAME) VALUES (?) [42102-196]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
at org.h2.message.DbException.get(DbException.java:179)
at org.h2.message.DbException.get(DbException.java:155)
at org.h2.command.Parser.readTableOrView(Parser.java:5552)
at org.h2.command.Parser.readTableOrView(Parser.java:5529)
at org.h2.command.Parser.parseInsert(Parser.java:1062)
at org.h2.command.Parser.parsePrepared(Parser.java:417)
at org.h2.command.Parser.parse(Parser.java:321)
at org.h2.command.Parser.parse(Parser.java:293)
at org.h2.command.Parser.prepareCommand(Parser.java:258)
at org.h2.engine.Session.prepareLocal(Session.java:578)
at org.h2.engine.Session.prepareCommand(Session.java:519)
at org.h2.jdbc.JdbcConnection.prepareCommand(JdbcConnection.java:1204)
at org.h2.jdbc.JdbcPreparedStatement.<init>(JdbcPreparedStatement.java:73)
at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:288)
at org.h2.jdbc.JdbcConnection.prepareStatement(JdbcConnection.java:1188)
at org.jetbrains.exposed.sql.statements.InsertStatement.prepared(InsertStatement.kt:58)
at org.jetbrains.exposed.sql.statements.Statement.executeIn$exposed(Statement.kt:46)
at org.jetbrains.exposed.sql.Transaction.exec(Transaction.kt:103)
at org.jetbrains.exposed.sql.Transaction.exec(Transaction.kt:97)
at org.jetbrains.exposed.sql.statements.Statement.execute(Statement.kt:27)
at org.jetbrains.exposed.sql.QueriesKt.insert(Queries.kt:43)
at MainKt$main$1.invoke(Main.kt:14)
at MainKt$main$1.invoke(Main.kt)
at org.jetbrains.exposed.sql.transactions.ThreadLocalTransactionManagerKt.inTopLevelTransaction(ThreadLocalTransactionManager.kt:92)
at org.jetbrains.exposed.sql.transactions.ThreadLocalTransactionManagerKt.transaction(ThreadLocalTransactionManager.kt:64)
at org.jetbrains.exposed.sql.transactions.ThreadLocalTransactionManagerKt.transaction(ThreadLocalTransactionManager.kt:55)
at MainKt.main(Main.kt:11)
Process finished with exit code 1
I think the create statement is missing from their example. The DAO example on the project's GitHub page seems to have a few statements that the example you point to does not.
Try adding a create statement:
fun main(args: Array<String>) {
Database.connect("jdbc:h2:mem:test", driver = "org.h2.Driver")
transaction {
logger.addLogger(StdOutSqlLogger)
// ADD THIS - Create tables
create (Cities)
val stPeteId = Cities.insert {
it[name] = "St. Petersburg"
} get Cities.id
println("Cities: ${Cities.selectAll()}")
}
}
And if that works, I bet they would accept a PR for their documentation.
I'm following the tutorial in corda tutorial pt 2 using kotlin. Everytime I try to start a new flow via the CRaSH shell in PartyA using the next command:
start IOUFlow iouValue: 30, otherParty: "C=US, L=New York, O=PartyB"
I get a Contract Verification Failure:
Done
Contract verification failed: List has more than one element., contract: com.template.IOUContract#7c109db7, transaction: D08920023D788F80F289527BD9C27BCD54B7DAC6C53866BFA7B90B23E0E4749B
IOUFlow class:
#InitiatingFlow
#StartableByRPC
class IOUFlow(val iouValue: Int,
val otherParty: Party) : FlowLogic<Unit>() {
override val progressTracker = ProgressTracker()
#Suspendable
override fun call() {
val notary = serviceHub.networkMapCache.notaryIdentities[0]
val outputState = IOUState(iouValue, ourIdentity, otherParty)
val outputContract = IOUContract::class.jvmName
val outputContractAndState = StateAndContract(outputState, outputContract)
val cmd = Command(IOUContract.Create(), listOf(ourIdentity.owningKey, otherParty.owningKey))
val txBuilder = TransactionBuilder(notary = notary)
.addOutputState(outputState, TEMPLATE_CONTRACT_ID)
.addCommand(cmd)
txBuilder.withItems(outputContractAndState, cmd)
txBuilder.verify(serviceHub)
val signedTx = serviceHub.signInitialTransaction(txBuilder)
val otherpartySession = initiateFlow(otherParty)
val fullySignedTx = subFlow(CollectSignaturesFlow(signedTx, listOf(otherpartySession), CollectSignaturesFlow.tracker()))
subFlow(FinalityFlow(fullySignedTx))
}
}
I've tried modifying App.kt to deal with this problem without luck. Does anyone know what the problem is?
Thanks in advance for your help.
The issue is that you're adding the command and output to the transaction twice:
val txBuilder = TransactionBuilder(notary = notary)
.addOutputState(outputState, TEMPLATE_CONTRACT_ID)
.addCommand(cmd)
txBuilder.withItems(outputContractAndState, cmd)
This causes the contract verification to fail, as you have two outputs instead of one.
I've a Corda application that using M14 to build and run corda to run a TwoPartyProtocol where either parties can exchange data to reach a data validity consensus. I've followed Corda flow cookbook to build a flow.
Also, after reading the docs from several different corda milestones I've understood that M14 no longer needs flowSessions as mentioned in the release notes which also eliminates need to register services.
My TwoPartyFlow with inner FlowLogics:
class TwoPartyFlow{
#InitiatingFlow
#StartableByRPC
open class Requestor(val price: Long,
val otherParty: Party) : FlowLogic<SignedTransaction>(){
#Suspendable
override fun call(): SignedTransaction {
val notary = serviceHub.networkMapCache.notaryNodes.single().notaryIdentity
send(otherParty, price)
/*Some code to generate SignedTransaction*/
}
}
#InitiatedBy(Requestor::class)
open class Responder(val requestingParty : Party) : FlowLogic<SignedTransaction>(){
#Suspendable
override fun call(): SignedTransaction {
val request = receive<Long>(requestor).unwrap { price -> price }
println(request)
/*Some code to generate SignedTransaction*/
}
}
}
But, running the above using startTrackedFlow from Api causes the above error:
Party CN=Other,O=Other,L=NY,C=US rejected session request: com.testapp.flow.TwoPartyFlow$Requestor has not been registered
I had hard time finding the reason from corda docs or logs since Two Party flow implementations have changed among several Milestones of corda. Can someone help me understand the problem here.
My API Call:
#GET
#Path("start-flow")
fun requestOffering(#QueryParam(value = "price") price: String) : Response{
val price : Long = 10L
/*Code to get otherParty details*/
val otherPartyHostAndPort = HostAndPort.fromString("localhost:10031")
val client = CordaRPCClient(otherPartyHostAndPort)
val services : CordaRPCOps = client.start("user1","test").proxy
val otherParty: Party = services.nodeIdentity().legalIdentity
val (status, message) = try {
val flowHandle = services.startTrackedFlow(::Requestor, price, otherParty)
val result = flowHandle.use { it.returnValue.getOrThrow() }
// Return the response.
Response.Status.CREATED to "Transaction id ${result.id} committed to ledger.\n"
} catch (e: Exception) {
Response.Status.BAD_REQUEST to e.message
}
return Response.status(status).entity(message).build()
}
My Gradle deployNodes task:
task deployNodes(type: net.corda.plugins.Cordform, dependsOn: ['build']) {
directory "./build/nodes"
networkMap "CN=Controller,O=R3,OU=corda,L=London,C=UK"
node {
name "CN=Controller,O=R3,OU=corda,L=London,C=UK"
advertisedServices = ["corda.notary.validating"]
p2pPort 10021
rpcPort 10022
cordapps = []
}
node {
name "CN=Subject,O=Subject,L=NY,C=US"
advertisedServices = []
p2pPort 10027
rpcPort 10028
webPort 10029
cordapps = []
rpcUsers = [[ user: "user1", "password": "test", "permissions": []]]
}
node {
name "CN=Other,O=Other,L=NY,C=US"
advertisedServices = []
p2pPort 10030
rpcPort 10031
webPort 10032
cordapps = []
rpcUsers = [[ user: "user1", "password": "test", "permissions": []]]
}
There appears to be a couple of problems with the code you posted:
The annotation should be #StartableByRPC, not #StartableNByRPC
The price passed to startTrackedFlow should be a long, not an int
However, even after fixing these issues, I couldn't replicate your error. Can you apply these fixes, do a clean re-deploy of your nodes (gradlew clean deployNodes), and see whether the error changes?
You shouldn't be connecting to the other node via RPC. RPC is how a node's owner speaks to their node. In the real world, you wouldn't have the other node's RPC credentials, and couldn't log into the node in this way.
Instead, you should use your own node's RPC client to retrieve the counterparty's identity:
val otherParty = services.partyFromX500Name("CN=Other,O=Other,L=NY,C=US")!!
See an M14 example here: https://github.com/corda/cordapp-example/blob/release-M14/kotlin-source/src/main/kotlin/com/example/api/ExampleApi.kt.
I'm playing with ScalikeJdbc library. I want to retrieve the data from PostgreSQL database. The error I get is quite strange for me. Even if I configure manually the CP:
val poolSettings = new ConnectionPoolSettings(initialSize = 100, maxSize = 100)
ConnectionPool.singleton("jdbc:postgresql://localhost:5432/test", "user", "pass", poolSettings)
I still see the error. Here is my DAO:
class CustomerDAO {
case class Customer(id: Long, firstname: String, lastname: String)
object Customer extends SQLSyntaxSupport[Customer]
val c = Customer.syntax("c")
def findById(id: Long)(implicit session: DBSession = Customer.autoSession) =
withSQL {
select.from(Customer as c)
}.map(
rs => Customer(
rs.int("id"),
rs.string("firstname"),
rs.string("lastname")
)
).single.apply()
}
The App:
object JdbcTest extends App {
val dao = new CustomerDAO
val res: Option[dao.Customer] = dao.findById(2)
}
My application.conf file
# PostgreSQL
db.default.driver = "org.postgresql.Driver"
db.default.url = "jdbc:postgresql://localhost:5432/test"
db.default.user = "user"
db.default.password = "pass"
# Connection Pool settings
db.default.poolInitialSize = 5
db.default.poolMaxSize = 7
db.default.poolConnectionTimeoutMillis = 1000
The error:
Exception in thread "main" java.lang.IllegalStateException: Connection pool is not yet initialized.(name:'default)
at scalikejdbc.ConnectionPool$$anonfun$get$1.apply(ConnectionPool.scala:57)
at scalikejdbc.ConnectionPool$$anonfun$get$1.apply(ConnectionPool.scala:55)
at scala.Option.getOrElse(Option.scala:120)
at scalikejdbc.ConnectionPool$.get(ConnectionPool.scala:55)
at scalikejdbc.ConnectionPool$.apply(ConnectionPool.scala:46)
at scalikejdbc.NamedDB.connectionPool(NamedDB.scala:20)
at scalikejdbc.NamedDB.db$lzycompute(NamedDB.scala:32)
What did I miss?
To load application.conf, scalikejdbc-config's DBs.setupAll() should be called in advance.
http://scalikejdbc.org/documentation/configuration.html#scalikejdbc-config
https://github.com/scalikejdbc/hello-scalikejdbc/blob/9d21ec7ddacc76977a7d41aa33c800d89fedc7b6/test/settings/DBSettings.scala#L3-L22
In my case I omit play.modules.enabled += "scalikejdbc.PlayModule" in conf/application.conf using ScalikeJDBC Play support...
We are on: akka-stream-experimental_2.11 1.0.
Inspired by the example
We wrote a TCP receiver as follows:
def bind(address: String, port: Int, target: ActorRef)
(implicit system: ActorSystem, actorMaterializer: ActorMaterializer): Future[ServerBinding] = {
val sink = Sink.foreach[Tcp.IncomingConnection] { conn =>
val serverFlow = Flow[ByteString]
.via(Framing.delimiter(ByteString("\n"), maximumFrameLength = 256, allowTruncation = true))
.map(message => {
target ? new Message(message); ByteString.empty
})
conn handleWith serverFlow
}
val connections = Tcp().bind(address, port)
connections.to(sink).run()
}
However, our intention was to have the receiver not respond at all and only sink the message. (The TCP message publisher does not care about response ).
Is it even possible? to not respond at all since akka.stream.scaladsl.Tcp.IncomingConnection takes a flow of type: Flow[ByteString, ByteString, Unit]
If yes, some guidance will be much appreciated. Thanks in advance.
One attempt as follows passes my unit tests but not sure if its the best idea:
def bind(address: String, port: Int, target: ActorRef)
(implicit system: ActorSystem, actorMaterializer: ActorMaterializer): Future[ServerBinding] = {
val sink = Sink.foreach[Tcp.IncomingConnection] { conn =>
val targetSubscriber = ActorSubscriber[Message](system.actorOf(Props(new TargetSubscriber(target))))
val targetSink = Flow[ByteString]
.via(Framing.delimiter(ByteString("\n"), maximumFrameLength = 256, allowTruncation = true))
.map(Message(_))
.to(Sink(targetSubscriber))
conn.flow.to(targetSink).runWith(Source(Promise().future))
}
val connections = Tcp().bind(address, port)
connections.to(sink).run()
}
You are on the right track. To keep the possibility to close the connection at some point you may want to keep the promise and complete it later on. Once completed with an element this element published by the source. However, as you don't want any element to be published on the connection, you can use drop(1) to make sure the source will never emit any element.
Here's an updated version of your example (untested):
val promise = Promise[ByteString]()
// this source will complete when the promise is fulfilled
// or it will complete with an error if the promise is completed with an error
val completionSource = Source(promise.future).drop(1)
completionSource // only used to complete later
.via(conn.flow) // I reordered the flow for better readability (arguably)
.runWith(targetSink)
// to close the connection later complete the promise:
def closeConnection() = promise.success(ByteString.empty) // dummy element, will be dropped
// alternatively to fail the connection later, complete with an error
def failConnection() = promise.failure(new RuntimeException)