So I have managed to get to ./build/nodes/runnodes section of the tutorial but all three terminal windows close stating : " [main] bridging.BridgeControlListener. - Failure to start BridgeControlListener" and " [main] internal.NodeStartupLogging. - Exception during node startup: stop can't be called twice "

not really sure how to fix this any suggestions ?

I'm running

Gradle 5.6.4

Build time: 2019-11-01 20:42:00 UTC
Revision: dd870424f9bd8e195d614dc14bb140f43c22da98

Kotlin: 1.3.41
Groovy: 2.5.4
Ant: Apache Ant(TM) version 1.9.14 compiled on March 12 2019
JVM: 1.8.0_332 (Amazon.com Inc. 25.332-b08)
OS: Mac OS X 12.4 x86_64

Hello, I'm trying to build a corda account for my project. I've installed the libraries inside of my build.gradle file. But, it seems have problem when I import the com.r3.corda.lib.accounts.contracts and com.r3.corda.lib.accounts.workflows inside of the file. Can I know how to solve the issues? (The issue is Cannot resolve symbol 'r3' and so on"

Grateful if you could help me understand why in obligations example the issue-iou method uses PUT rather than GET?

The contracts:test of the snakes'n'ladders sample fails with this error:

Cannot find contract attachments for BoardConfigContractnull

It can be resolved by changing the ID in the contract from

public static String ID = "BoardConfigContract";

to

public static String ID = "net.corda.samples.snl.contracts.BoardConfigContract";

Actually you can even make it final.

I'm pretty sure that other samples are affected as well. The cordapp-template-java already uses the fully qualified ID, but many samples don't. I wonder why this issue hasn't been found earlier... has it been introduced with a minor JDK update? I'm using AdoptOpenJDK 1.8.0_292.

The blob-inspector could be useful for support staff to investigate issues.
Add a sample demonstrating simple serialisation and also serialisation when using jars on the classpath.

I'm getting the error

RPCClientProxyHandler.onRemoval - A hot observable returned from an RPC was never subscribed to. This wastes server-side resources because it was queueing observations for retrieval. It is being closed now, but please adjust your code to call .notUsed() on the observable to close it explicitly. (Java users: subscribe to it then unsubscribe). If you aren't sure where the leak is coming from, set -Dnet.corda.client.rpc.trackRpcCallSites=true on the JVM command line and you will get a stack trace with this warning.

Following this example template, and making calls with SignedTransaction result = proxy.startTrackedFlowDynamic(ExampleFlow.Initiator.class, amount,otherParty).getReturnValue().get();

This SO says that the Observable needs to be subscribed and unsubscribed to. How is that supposed to be done properly given the example?

The docs talk about paging and sorting.

It would be useful to have a demo that did pagination and sorting.

How to do sorting on standard columns as well as custom columns would be useful.

After starting example protect CorDapps (java) ./gradlew clean deployNodes the command line output to back error. Symbol not found: _clock_gettime
Corda can be run on mac OS 10.11.x or it is bag?

dyld: lazy symbol binding failed: Symbol not found: _clock_gettime
Referenced from: /private/var/folders/5t/4rpy0xg14fs_jc6bzhrc0nhc0000gn/T/libnetty_transport_native_kqueue_x86_645958139591609157117.dylib
Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: _clock_gettime
Referenced from: /private/var/folders/5t/4rpy0xg14fs_jc6bzhrc0nhc0000gn/T/libnetty_transport_native_kqueue_x86_645958139591609157117.dylib
Expected in: /usr/lib/libSystem.B.dylib

In oracle-primenumber/README.md:

"We can then see the state wrapping the 5th prime (11) in our vault by running:

run vaultQuery contractStateType: net.corda.examples.oracle.base.states.PrimeState"

code refactored to:

run vaultQuery contractStateType: net.corda.samples.oracle.states.PrimeState

i am using corda 4.10 and trying to connect to postgresql driver verison 42.2.9 then it gives error like incompatible database schema version detected please run schema migration scripts reasion there are 112 outstanding database changes. i am also try with another version of postgresql 42.1.4 driver but still i am facing same issue.Please give any solution.

In the original example repo there was an example of using custom queries:
https://github.com/corda/cordapp-example/blob/release-V4/java-source/src/main/java/com/example/api/ExampleApi.java#L132-L137

    QueryCriteria generalCriteria = new QueryCriteria.VaultQueryCriteria(Vault.StateStatus.ALL);
    FieldInfo lenderField = QueryCriteriaUtils.getField("lender", IOUSchemaV1.PersistentIOU.class);
    CriteriaExpression lenderIndex = Builder.equal(lenderField, myLegalName.toString());
    QueryCriteria lenderCriteria = new QueryCriteria.VaultCustomQueryCriteria(lenderIndex);
    QueryCriteria criteria = generalCriteria.and(lenderCriteria);
    List<StateAndRef<IOUState>> results = rpcOps.vaultQueryByCriteria(criteria,IOUState.class).getStates();

There doesn't appear to be a similar example in this repo.

I am new to Corda and this question is totally newbie question,
I want to build a sample blockchain app that can be consumed using REST for that I want to use quarkus https://quarkus.io/ is there an example I can refer to? please help.

error: package com.google.common.collect does not exist import com.google.common.collect.ImmutableSet;

I'm getting the above error after inserting the following line:

(

Hi,

H2 database access via localhost is broken even though using the database URL given.
Getting connection refused.
Anyone have any idea? Thanks

Attached with is the node configuration

I have finished both flows of issue.

But when I try HouseSaleInitiorFlow, I can only see nothing but "starting".

And I found that the transaction is not finished.

Does anyone know how to fix it?

I tried gradlew clean deployNodes in directory, 'cd samples-java\Accounts\supplychain' and got the error mentioned in snapshot. Please help me to resolve this issue. The irony is, I build the same repo few months back and now it is not building.

After executing "gradlew deployNodes" the operation fails and continues to emit log messages until the JVM runs out of memory. Then the system is left in an unstable state requiring a reboot.

Questions about load testing and performance frequently come up on Slack.

Corda Enterprise has the jmeter test suite, however, most new people seem to want something simple to use with their samples and not a full fledged solution. They also don't have access to Corda Enterprise.

JMeter is a pain to setup from scratch so a basic example without it would be sufficient as a sample.

A simple sample could do the following:

• Run a Cordapp with a Spring Boot REST API (e.g. obligation-cordapp)
• Take a CSV file as an input, convert it and upload it row by row to the REST API
• Output a report containing the total time taken and maybe a few other metrics

e.g. some memory/CPU metrics https://www.baeldung.com/java-metrics and an example of a Corda JMX metric

Figures such as 600 TPS per node have been published https://medium.com/corda/transactions-per-second-tps-de3fb55d60e3 for Corda Enterprise so running a CSV file with 6000 rows would be interesting.

With this many rows the memory/CPU data etc could help highlight issues like how running on a laptop is very different from a server.

Ideally, this sample should be relatively easy to re-use for peoples own projects and require very little setup.
They should just be able to run it after checkout without 100 manual steps!

If the sample is done well, the users should just be able to put their own Cordapp/REST API and do the CSV conversion but still get the metrics and report without much more effort.

Hi,

following up this question on StackOverflow. Since the signers are all accounts all in the same node, the CollectSignatureFlow should not be needed. The comment in the source code of this example is either in contrast with what the Account Library documentation says or the documentation needs to be clarified to avoid confusion to learners.

Hi
When you create nodes using Cordform, after building the project (through ./gradlew deployNodes) and running nodes (through ./build/nodes/runnodes) you can test APIs by running each server, e,g, runPartyAServer by command ./gradlew runPartyAServer.
But if you use Dockerform to create nodes, after building the project (through ./gradlew prepareDockerNodes) and running nodes (through docker-compose up), execution of command ./gradlew runPartyAServer encounters an error like the following:

I 21:36:25 1 RPCClient.logElapsedTime - Failed Startup took 259 msec
W 21:36:25 1 AnnotationConfigServletWebServerApplicationContext.refresh - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'controller' defined in file [.../clients/build/classes/java/main/net/corda/samples/example/webserver/Controller.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'nodeRPCConnection': Invocation of init method failed; nested exception is net.corda.client.rpc.RPCException: Cannot connect to server(s). Tried with all available servers.

Docker can be a bit daunting if you have never used it before.

Add a Docker sample that clearly shows a deployment process involved creating your own docker image.
e.g.

• creating self-signed certificates and a note about how to do it outside of simple demos
• connecting to a bootstrapped network
• best practices of which directories should be mounted

https://docs.corda.net/docs/corda-os/4.8/docker-image.html