ckb-sdk-java | Java SDK for CKB - Java SDK for Nervos CKB | Blockchain library

 by   nervosnetwork Java Version: rc/v2.1.0 License: MIT

kandi X-RAY | ckb-sdk-java Summary

kandi X-RAY | ckb-sdk-java Summary

ckb-sdk-java is a Java library typically used in Blockchain applications. ckb-sdk-java has no bugs, it has no vulnerabilities, it has build file available, it has a Permissive License and it has low support. You can download it from GitHub, Maven.

Java SDK for Nervos CKB. The ckb-sdk-java is still under development and considered to be a work in progress. You should get familiar with CKB transaction structure and RPC before using it.

            kandi-support Support

              ckb-sdk-java has a low active ecosystem.
              It has 26 star(s) with 21 fork(s). There are 12 watchers for this library.
              There were 1 major release(s) in the last 12 months.
              There are 3 open issues and 24 have been closed. On average issues are closed in 39 days. There are 2 open pull requests and 0 closed requests.
              It has a neutral sentiment in the developer community.
              The latest version of ckb-sdk-java is rc/v2.1.0

            kandi-Quality Quality

              ckb-sdk-java has 0 bugs and 0 code smells.

            kandi-Security Security

              ckb-sdk-java has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              ckb-sdk-java code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              ckb-sdk-java is licensed under the MIT License. This license is Permissive.
              Permissive licenses have the least restrictions, and you can use them in most projects.

            kandi-Reuse Reuse

              ckb-sdk-java releases are available to install and integrate.
              Deployable package is available in Maven.
              Build file is available. You can build the component from source.
              Installation instructions, examples and code snippets are available.
              ckb-sdk-java saves you 3213 person hours of effort in developing the same functionality from scratch.
              It has 13325 lines of code, 1101 functions and 285 files.
              It has low code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed ckb-sdk-java and discovered the below as its top functions. This is intended to give you an instant insight into ckb-sdk-java implemented functionality, and help decide if they suit your requirements.
            • Retrieves a reward from the wallet
            • Compares this script with the specified object
            • Return the occupied capacity of the given data
            • Reverse the bytes in little endian order
            • Returns a short address for the script
            • Encode a Bech32 string
            • Creates a checksum
            • Main entry point
            • Encodes the given script and returns a Bech32 string
            • Builds the SUDT
            • Performs the signature on the given context
            • Checks if two arguments are equal
            • Generate an acp address
            • Create a new identity item from a security block
            • Compares this object to another address
            • Compares this ECKey with another
            • Generates CHEQUE hash for the given sender and receiver
            • Sets an integer to a byte array
            • Encodes a long into little - endian hexadecimal
            • Perform an asynchronous POST asynchronously
            • Get the offsets from the raw data
            • Creates a new type adapter for the given type
            • Encodes the script
            • Builds the script
            • Main method
            • Main method to start a transaction
            Get all kandi verified functions for this library.

            ckb-sdk-java Key Features

            No Key Features are available at this moment for ckb-sdk-java.

            ckb-sdk-java Examples and Code Snippets

            CKB SDK Java,Quick start,Build transaction
            Javadot img1Lines of Code : 29dot img1License : Permissive (MIT)
            copy iconCopy
            // Prepare client and utils class
            Api ckbApi = new Api("", false);
            CkbIndexerApi ckbIndexerApi = new CkbIndexerApi("", false);
            TransactionBuilder txBuilder = new TransactionBuilder(ckbApi);
            IndexerCollector t  
            Javadot img2Lines of Code : 23dot img2License : Permissive (MIT)
            copy iconCopy
            implementation 'org.nervos.ckb:core:{version}'
            implementation 'org.nervos.ckb:ckb:{version}'
            implementation 'org.nervos.ckb-api:c  
            CKB SDK Java,Quick start,Sign and send transaction
            Javadot img3Lines of Code : 21dot img3License : Permissive (MIT)
            copy iconCopy
            // Assume that you already have an unsigned transaction named `rawTx`
            Secp256k1SighashAllBuilder signBuilder = new Secp256k1SighashAllBuilder(rawTx);
            // Prepare private key to sign
            List scriptGroupWithPrivateKeysList = new ArrayList<>();

            Community Discussions


            Why Metamask if web3.js can interact directly with ganache?
            Asked 2022-Mar-30 at 17:55

            I am new to blockchain app development, I saw a project where ganache accounts are imported into Metamask, then web3.js is used to access and print those accounts and balances on Frontend (user interface).

            If web3.js can directly access ganache blockchain accounts and balances, why do we need Metamask in between?



            Answered 2022-Feb-08 at 09:11

            If web3.js can directly acccess ganache blockchain accounts and balances, why we need metamask in between?

            In this case, you don't need MetaMask to sign the transaction, as the node (Ganache) holds your private key.

            But in a public environment (testnets and mainnet), the node doesn't hold your private key, so you'd need to sign the transaction using MetaMask (or any other tool that holds the private key).



            How to get all the NFTs of particular smart contract
            Asked 2022-Mar-30 at 11:00

            I tried docs to fetch data. However, I think there are 2 APIs.



            Answered 2021-Aug-04 at 15:03

            The assets endpoint (docs) has the asset_contract_address filter that allows you to filter by a contract address. Which will effectively allow you to paginate through all NFTs of the contract (that Opensea knows of).




            I am not able to use ipfs
            Asked 2022-Mar-29 at 03:32

            I want to publish files on ipfs but it's showing me an error.

            Here is my code...



            Answered 2021-Nov-11 at 04:27

            I am not familiar with ipfs but i checked the official docs and they have done the first line like this:



            Interacting With Contract Web3.js
            Asked 2022-Mar-19 at 17:10

            I have been trying to interact with a contract on the AVAX chain using web3js and it keeps throwing the error, "TypeError: Cannot read properties of undefined (reading 'send')". I cannot figure out why this is happening, as it should be a valid statement. If anyone can help that would be awesome.



            Answered 2022-Mar-19 at 17:10

            The ABI needs to contain just the function and event definitions that are stored in your result property. Without the wrapper object containing status and other properties.

            So in your case



            Should I use the elrond devnet instead of the testnet for development?
            Asked 2022-Mar-08 at 09:03

            I've been using the testnet lately and I encounter issues: they reset it very often and the service is down for multiple hours and sometimes have bugs.

            Should I use the devnet? From what I've understood it's more stable and they reset it less often?

            I have a backend in js that uses the elrond-sdk-erdjs and I'm confused because there is no function that initializes the only the testnet. Is there a reason?




            Answered 2021-Aug-24 at 12:56

            The testnet is pretty volatile and it is reset very often (maybe weekly), without any warnings. Elrond recommends developers to use the devnet, it is reset maybe once every 3-4 months, so it's more stable.

            You can get the provider like this:



            Trying to run "brownie run .\scripts\ --network rinkeby" but getting a ValueError
            Asked 2022-Mar-01 at 18:15

            Hey guys I am trying to deploy my project on the rinkeby chain using infura, but I am getting a ValueError Here is my trackback:



            Answered 2021-Nov-28 at 10:14

            it appears your env variables are not set correctly, and it looks like in this case it's your WEB3_INFURA_PROJECT_ID.

            You can fix it by setting the variable in your .env file and adding dotenv: .env to your brownie-config.yaml.


            dotenv: .env .env:

            export WEB3_INFURA_PROJECT_ID=YOUR_PROJECT_ID_HERE Remember to save these files.

            Additionally, you should be on at least brownie version v1.14.6. You can find out what version you're on with:

            brownie --version



            I want to get the address from mnemonic with the proper derivation path
            Asked 2022-Feb-23 at 00:41

            I am very new to blockchain programming and programming in general. I want to generate my SOL address using the mnemonic seed phrase with the derivation path "m/44'/501'/0'/0". I can't find a proper BIP44 module for python where you can specify the derivation path.



            Answered 2022-Feb-23 at 00:41

            After a long search through the internet, I have finally found a way of solving my problem that I want to share with you.



            error in ganache installation: The term 'ganache-cli' is not recognized as the name of a cmdlet, function, script file, or operable program
            Asked 2022-Feb-18 at 17:26

            I installed ganache with yarn, but when I check the version to see if correctly installed, I get the error: "The term 'ganache-cli' is not recognized as the name of a cmdlet, function, script file, or operable program".



            Answered 2021-Oct-18 at 02:20

            I had the same issue but then I installed with npm and it worked



            Truffle installation error: "install latest visual studio version"
            Asked 2022-Feb-17 at 16:59

            enter image description hereI've installed latest version of visual studio with desktop development c++ workload but still they are asking for it when i try to install truffle. I entered command :npm install -g truffle and lot of messages appear after 2 to 3 minutes of some kind of installation process. they are asking for Latest version of Visual Studio with "Desktop development with c++ workload" whereas i just installed my Visual studio with the same requirements. node.js and ganache are already installed. Is there any other way to install truffle?



            Answered 2022-Feb-17 at 16:59

            If you are installing it using npm package manager. Downgrade your npm to 7.24.2 it worked for me I hope it will also work for you. Use the following command to downgrade npm



            Why am I getting this error Error: Transaction reverted without a reason string. When trying to swap tokens on uniswap?
            Asked 2022-Feb-17 at 06:46

            I'm trying to swap tokens on uniswap unsing hardhat's mainnet fork but I'm getting this error: Error: Transaction reverted without a reason string. And I don't really know why.

            Here is my swap function:



            Answered 2022-Feb-17 at 06:46

            Weth is different from other token, you're not able to use swapTokensForTokens. We must use the swapEthForTokens function instead, and you have to declare the data option separately.

            so in your case we need to do:

            Solidity code:


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


            No vulnerabilities reported

            Install ckb-sdk-java

            You can generate the jar and import manually. A console-{version}-all.jar package will be generated in console/build/libs, which you can put into your project to develop with it. A ckb-sdk-{version}-all.jar package will be generated in ckb-sdk/build/libs, which you can put into your project to develop with it. If you don't want to generate the jar by yourself, you can download a build from releases. When you need to import ckb-java-sdk dependency to your project, you can add the console-{version}-all.jar or ckb-sdk-{version}-all.jar to your project libs package. If you use Java IDE (eg. IntelliJ IDEA or Eclipse or other Editors), you can import jar according to IDE option help documents.
            Here we will give some most frequently used operations, to bring you enlightenment about how to use ckb-sdk-java to operate your asset in CKB chain.
            ckb-java-sdk provides a convenient client to help you easily interact with CKB, CKB-indexer or Mercury node. You can leverage this client to call any RPC APIs provided by CKB, CKB-indexer or Mercury in Java code.
            CKB RPC doc
            CKB-indexer RPC doc
            Mercury RPC doc.
            In order to build transaction, you have to collect the live cells that you want to spend at first. In the example below we use CKB indexer to get live cells. You also can get them by manual (e.g. check on CKB explorer) or by your own database. A more recommended way is to directly call RPC API build_simple_transfer_transaction provided by Mercury, which could help you do almost everything above in building transaction.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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