corda | open source blockchain project , designed for business | Blockchain library

 by   corda Kotlin Version: 4.9.6 License: Apache-2.0

kandi X-RAY | corda Summary

kandi X-RAY | corda Summary

corda is a Kotlin library typically used in Blockchain applications. corda has no bugs, it has no vulnerabilities, it has a Permissive License and it has medium support. You can download it from GitHub.

Corda is an open source blockchain project, designed for business from the start. Only Corda allows you to build interoperable blockchain networks that transact in strict privacy. Corda's smart contract technology allows businesses to transact directly, with value.

            kandi-support Support

              corda has a medium active ecosystem.
              It has 3936 star(s) with 1089 fork(s). There are 315 watchers for this library.
              There were 2 major release(s) in the last 12 months.
              There are 49 open issues and 581 have been closed. On average issues are closed in 812 days. There are 4 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of corda is 4.9.6

            kandi-Quality Quality

              corda has no bugs reported.

            kandi-Security Security

              corda has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

            kandi-License License

              corda is licensed under the Apache-2.0 License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              corda releases are available to install and integrate.
              Installation instructions are available. Examples and code snippets are not available.

            Top functions reviewed by kandi - BETA

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            corda Key Features

            No Key Features are available at this moment for corda.

            corda Examples and Code Snippets

            How to tidying my Java code because it has too many looping
            Javadot img1Lines of Code : 110dot img1License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            //Test class
            public class Test {
                public static void main(String[] args) {
                    Node root = new Node(1, "test1", new Node[]{
                            new Node(2, "test2", new Node[]{
                                    new Node(5, "test6", new Node[]{})
            How to insert node by xpath in nodejs, typescript?
            Lines of Code : 24dot img2License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            import {DOMParser as dom} from "xmldom";
            import * as xpath from "xpath";
            export default class FileJob extends BaseJob {
                async execute(settings: JobSettings) {
            Issue in forming node structure when multiple identical keys found in a nodeset
            Lines of Code : 52dot img3License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            Best suited data structure for prefix matching search
            Lines of Code : 130dot img4License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            class TrieNode {
                constructor(data=null) {
                    this.children = {}; // Dictionary, 
           = data; // Non-null when this node represents the end of a valid word
                addWord(word, data) {
                    let node = this; // t
            copy iconCopy
            FROM node:16.13.0-alpine
            USER node
            ADD --chown=node:node . /home/node
            RUN cd /home/node && \
                npm install --production
            CMD [ "node", "/home/node/app.js" ]
            How to programmatically know when NodeJS application is running out of memory
            Lines of Code : 22dot img6License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            const process = require("process");
            $ node index.js
              rss: 4935680,
              heapTotal: 1826816,
              heapUsed: 650472,
              external: 49879,
              arrayBuffers: 9386
            how to authenticate to google text-to-speech with service account
            Lines of Code : 3dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            export GOOGLE_APPLICATION_CREDENTIALS=/path/to/auth/service_acct_key.json
            node server.js
            Angular: window.print() unit test
            Lines of Code : 13dot img8License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            it('should call print and cancel', () => {
              // spy on print and cancel on window object
              const printSpy = spyOn(window, 'print');
              const cancelSpy = spyOn(window, 'cancel');
              // call print
              component.print({/* mock component howev
            How to Open URL "on click" after Scanning a QR Code in React-Native Android App
            Lines of Code : 37dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            import { useState } from 'react';
            import { Text } from 'react-native';
            const App = () => {
              const [scan, setScan] = useState(false);
              const [result, setResult] = useState();
              function onSuccess(e){
            I can't install nestjs in ubuntu 20.04
            Lines of Code : 10dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
              npx @nestjs/cli g controller pages
              which node
              which nodejs
              alias nest="/your/path/to/node/bin/nest"
              nest --version

            Community Discussions


            (R3 Corda 4.8) Selected output constraint: net.corda.core.contracts.WhitelistedByZoneAttachmentConstraint@1f102389 not satisfying
            Asked 2022-Jan-24 at 04:23

            I had cloned the cordapp-kotlin-template . I've defined a state called LoadState which looks like this:



            Answered 2022-Jan-24 at 04:23

            After our discussion in the above comments section, it appears that your states have been issued using Whitelist zone constraint.

            Also looking at the code it is clear that you have not explicitly added Whitelist Zone constraints for your states. Then there remain two more possibilities by which states are issued using Whitelist Zone constraint.

            One is you are using some Corda version before 4 or you have included the necessary configs to include white list zone constraints in network bootstrapper as specified here. You have two options - either start from scratch and make sure you use Corda 4.

            If you cannot start from scratch follow this path to first migrate the whitelist zone constraints to signature constraints, before running your UpdateLoadFlow. You can refer to this blog which talks about constraint migration.



            Specify cordapps folder when running a corda node
            Asked 2021-Dec-29 at 09:09

            The java -jar corda.jar command picks up cordapps from $basedir/cordapps by default. Is there an option to specify an alternatively cordapps directory? This may be useful when multiple nodes are sharing the same set of cordapps.



            Answered 2021-Dec-29 at 09:09

            It's not possible to override only cordapp path. You can override the workspace directory and other fields in the node.conf (documentation).

            An option could be to mount a folder in each node from a shared filesystem (e.g. EFS on AWS) where you store the cordapps.



            How to deploy and run corda node in different system and connect each other?
            Asked 2021-Dec-28 at 13:58

            I am trying to create a POC of Corda. I was able to connect 3 nodes running in my system with different ports. But now i want to connect different vms running on different system. What I am planning to do is run two vms on two different systems as two different nodes. How do i connect them?

            I am attaching my node configuration



            Answered 2021-Dec-28 at 13:58

            Easiest way to make Nodes known to eachother without using a network-map-service is to copy each node's "nodeinfo-*"-file into all other node's "additional node-infos" directory (see here ). This directory will contain all node-info files that this specific node knows about(their names, parties, ip-addresses, ports etc.) Also make sure that your vm is capable of inbound and outgoing connections like Alessandro Baffa said.

            You can read up on this topic here:



            Corda Network-Map is up and running, but Notary is not in whitelist
            Asked 2021-Dec-26 at 02:09

            I have a Corda Infrastructure with some nodes and a (not validating) notary. They're all using a Network Map for the compatibility zone, and all the corda nodes, including the notary, download the same network-parameters file.

            When executing a flow, Corda gives me an Exception because the Notary is not on the network parameters whitelist. I cannot find anything anything about that on R3 Documentation.



            Answered 2021-Dec-26 at 02:09

            Do I have to do something explicit to add Notary in network parameters whitelist?

            Yeah you do. Since you are using a network-map-service your node will get its network-parameters from there.

            What you'll have to do then is

            1. delete your current network-parameters for every Node.
            2. whitelist your Notary Node into your network-map-service
            3. restart all your Nodes so they can retrieve the new network-parameters from the network-map-service where the new Notary is assigned as such

            I don't know which network-map-service exactly you use but i assume its nms by cordite. You can read up on how to whitelist a Notary here:



            R3 Corda and log4j dependency
            Asked 2021-Dec-20 at 06:49

            I could see there is a dependency with log4j and log4j-core-2.13.3.jar is embedded in corda.jar. Is there any update available or how can we fix the log4j related vulnerability



            Answered 2021-Dec-20 at 06:49

            This page provides updates on all major alerts, fixes and forthcoming patch releases. Check the top of the page for the most urgent alerts.



            Corda - SignTransactionFlow and sendAndReceive
            Asked 2021-Dec-18 at 00:14

            I have two parties (A and B). A sends to B a Corda State using SignTransactionFlow, so also obtains the counterparty signature for that transaction.

            Is it possibile to share a Corda State without using a SignTransactionFlow but using a sendAndReceive calls? If so, will the counterparty receiving a Corda State through sendAndReceive be able to consume that state?



            Answered 2021-Dec-18 at 00:14

            Yes, it's possible to send states using send() and receive(). Here is a code sample that I tested to see if it works:



            API testing with TestContainers in Corda
            Asked 2021-Nov-15 at 10:26

            I'm coding a REST API that connects to my Corda Node via Corda RPC. I'm trying to create a mock testing corda network with TestContainers so that I can verify the behaviors of my REST API. I know Corda has official docker image. Is there any guidance on how might I go about implementing this?



            Answered 2021-Nov-15 at 10:26

            I would look at this/divide this into two parts.

            1. Server side testing - Testing your node RPC endpoints.
            2. Client side testing - Testing your rest endpoints.

            For the first part, you can use the NodeDriver to write the integration tests. Using the NodeDriver, you can bring up nodes locally to run flows and inspect state updates. The NodeDriver allows you to access the node using RPC endpoints. You can read more about NodeDriver here.

            For the second part, you can use something like mockito to mock the RPC calls and test your client logic.

            This way you will easily be able to test client and server side.

            To do an actual end to end integration test, you will have to start the docker nodes using a script and then you can test the methods from the client code.



            How to run migration scripts for a corda node running inside the docker container?
            Asked 2021-Nov-09 at 12:14

            The official docker image for Corda uses a run-corda command to start the node. However, sometimes the node needs to be configured first before starting up. An example would be to run database migration scripts when new schemas are introduced by new CorDapps. How can I run such commands first before starting up the node?



            Answered 2021-Nov-09 at 12:14

            The question is answered on Corda's Slack channel. I'll just move it here.

            The problem can be solved by overriding the image's start-up command (run-corda) with the following:



            Relation between rpc client (proxy) username and node Identity
            Asked 2021-Oct-26 at 16:44

            In Corda we are using CordaRPCClient to initiate transaction from the client. Here we are passing username and password to start the connection. Right now I am using hardcoded user name and password. Can I map this to a user table which is there in DB. Please share if there any best practices exists.



            Answered 2021-Oct-26 at 16:44

            Yes you can definitely have rpc users fetched from a database. All you would need is some configuration in the nodes configuration file (node.conf).

            The users are generally defined in the security block. Below is how it can be configured.



            Intellij having trouble with code completion under Kotlin 1.2
            Asked 2021-Oct-23 at 21:42

            I'm having trouble setting up the development environment for Corda. It seems IntelliJ's code completion feature is malfunctioning. I suspect that it's because incompatible kotlin language version (v1.2.71, used by Corda 4) with IntelliJ's kotlin-plugin version (v1.5).

            This is what I want IntelliJ to do when I'm typing the code

            This is what actually happened. As can be seen, no auto-completion or method suggestion showsed up.

            The above two snippets are recorded in the same setting, but why is it working in the first case but failed in the second? How can I configure my environment so code completion can work?



            Answered 2021-Oct-23 at 21:42

            As you said, the problem is the not compatibility with the latest version of the Kotlin plugin. To develop smoothly with Corda 4.x it is better to use an older version of IntelliJ (2020). It is frustrating, I know. Corda 5 support for Kotlin will be, hopefully, better.


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install corda

            Read the Getting Started documentation
            Run the Example CorDapp
            Read about Corda's Key Concepts
            Follow the Hello, World! tutorial


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