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Sample web3j project using Gradle

Java 100.00%

sample-project-gradle's Introduction

Web3j: Web3 Java Ethereum Ðapp API

Web3j is a lightweight, highly modular, reactive, type safe Java and Android library for working with Smart Contracts and integrating with clients (nodes) on the Ethereum network:

This allows you to work with the Ethereum blockchain, without the additional overhead of having to write your own integration code for the platform.

The Java and the Blockchain talk provides an overview of blockchain, Ethereum and Web3j.

NEW! Get involved!

Since Web3J moved under Hyperledger we started to do Web3J Contributors calls every 2 weeks! Subscribe to our community page and to see check our call schedule. Your contribution matters!

Community Link - Check our last updates!
Calendar Invite - Add the contributor call to your calendar!

Features

Complete implementation of Ethereum's JSON-RPC client API over HTTP and IPC
Ethereum wallet support
Auto-generation of Java smart contract wrappers to create, deploy, transact with and call smart contracts from native Java code (Solidity and Truffle definition formats supported)
Reactive-functional API for working with filters
Ethereum Name Service (ENS) support
Support for Parity's Personal, and Geth's Personal client APIs
Support for Alchemy and Infura, so you don't have to run an Ethereum client yourself
Comprehensive integration tests demonstrating a number of the above scenarios
Command line tools
Android compatible
Support for JP Morgan's Quorum via web3j-quorum
Support for EEA Privacy features as described in EEA documentation and implemented in Hyperledger Besu.

It has five runtime dependencies:

RxJava for its reactive-functional API
OKHttp for HTTP connections
Jackson Core for fast JSON serialisation/deserialization
Bouncy Castle for crypto
Jnr-unixsocket for *nix IPC (not available on Android)
Java-WebSocket

It also uses JavaPoet for generating smart contract wrappers.

QuickStart

The simplest way to start your journey with Web3j is to create a project. We provide this functionality using the Web3j CLI. This latter can be installed as follows:

For Unix:

curl -L get.web3j.io | sh && source ~/.web3j/source.sh

For Windows, in Powershell:

Set-ExecutionPolicy Bypass -Scope Process -Force; iex ((New-Object System.Net.WebClient).DownloadString('https://raw.githubusercontent.com/web3j/web3j-installer/master/installer.ps1'))

Create a new project by running:

$ web3j new

Or use our Maven or Gradle plugins to generate java files from Solidity contracts.

Please head to the Web3j Documentation for further instructions on using Web3j.

Maven

Java:

<dependency>
  <groupId>org.web3j</groupId>
  <artifactId>core</artifactId>
  <version>4.12.0</version>
</dependency>

Note: The Web3j Java binaries are compiled using Java 17. Java 17 or a more recent version is required to use Web3j as a dependency.

Android:

<dependency>
  <groupId>org.web3j</groupId>
  <artifactId>core</artifactId>
  <version>4.8.9-android</version>
</dependency>

Gradle

Java:

implementation ('org.web3j:core:4.12.0')

Android:

implementation ('org.web3j:core:4.8.9-android')

Build instructions

Web3j includes integration tests for running against a live Ethereum client. If you do not have a client running, you can exclude their execution as per the below instructions.

To run a full build (excluding integration tests):

$ ./gradlew check

To run the integration tests, you will need to set up these variables in order to pull the Docker images from the Docker Hub registry:

registry.username
registry.password

Then run the following command:

$ ./gradlew -Pintegration-tests=true :integration-tests:test

If you do not want the integration test to run:

$ ./gradlew -Pintegration-tests=false :test

Check the Docker client API for more information on configuration options.

Commercial support and training

Commercial support and training is available from web3labs.com.

License

Apache 2.0

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sample-project-gradle's Issues

android studio

I used Android studio 3.5 to compile this program and promote not module not speicfied,
Can you help me to solve this problem?

insufficient funds for gas * price + value

my ropsten eth : https://ropsten.etherscan.io/address/0x8bCF7803a7CBFB2010456D9040030fFb6754c429


        Web3j web3 = Web3j.build(new HttpService("https://ropsten.infura.io/v3/<project_id>"));

        EthGetBalance balance = web3.ethGetBalance("0x8bCF7803a7CBFB2010456D9040030fFb6754c429", DefaultBlockParameterName.LATEST).send();
        System.out.println(balance.getBalance());
        Credentials creds = Credentials.create("0x8bCF7803a7CBFB2010456D9040030fFb6754c429");
        Demo_sol_GameItem send = Demo_sol_GameItem.deploy(web3, creds, new DefaultGasProvider()).send();
        System.out.println(send.getContractAddress());

Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: Error processing transaction request: insufficient funds for gas * price + value
at org.web3j.tx.Contract.deploy(Contract.java:457)
at org.web3j.tx.Contract.lambda$deployRemoteCall$7(Contract.java:605)
at org.web3j.protocol.core.RemoteCall.send(RemoteCall.java:42)
at com.a.App.main(App.java:36)
Caused by: java.lang.RuntimeException: Error processing transaction request: insufficient funds for gas * price + value
at org.web3j.tx.TransactionManager.processResponse(TransactionManager.java:162)
at org.web3j.tx.TransactionManager.executeTransaction(TransactionManager.java:81)
at org.web3j.tx.ManagedTransaction.send(ManagedTransaction.java:127)
at org.web3j.tx.Contract.executeTransaction(Contract.java:364)
at org.web3j.tx.Contract.create(Contract.java:419)
at org.web3j.tx.Contract.deploy(Contract.java:453)
... 3 more

Unable to execute the sample web3j project

Hi I am trying to run a given sample web3j project in android. But every time I get the following exception.
java.lang.RuntimeException: Error processing transaction request: insufficient funds for gas * price + value

Error processing transaction request: insufficient funds for gas * price + value

Hello, I'm running client
geth --rpcapi personal,db,eth,net,web3 --rpc --rinkeby

server answers: instance=Geth/v1.7.3-stable/linux-amd64/go1.9.4...
importing blocks, no problem.

I fed my account "https://rinkeby.etherscan.io/address/0x03fb8e3666ee5dcc07fc74c85d26f0fd952e39e1"

But every time I'm trying to run sample.java i'm getting this error:

Connected to Ethereum client version: Geth/v1.7.3-stable/linux-amd64/go1.9.4
Credentials loaded
Sending 1 Wei (0.000000000000000001 Ether)
Exception in thread "main" java.lang.RuntimeException: Error processing transaction request: insufficient funds for gas * price + value
at org.web3j.tx.TransactionManager.processResponse(TransactionManager.java:67)
at org.web3j.tx.TransactionManager.executeTransaction(TransactionManager.java:51)
at org.web3j.tx.ManagedTransaction.send(ManagedTransaction.java:70)
at org.web3j.tx.Transfer.send(Transfer.java:65)
at org.web3j.tx.Transfer.send(Transfer.java:49)
at org.web3j.tx.Transfer.lambda$sendFunds$20(Transfer.java:76)
at org.web3j.protocol.core.RemoteCall.send(RemoteCall.java:30)
at org.web3j.sample.Application.run(Application.java:81)
at org.web3j.sample.Application.main(Application.java:55)

compile solidity error

download solc and put in the root directory of project .
then command run grandlew.bat build then show error:
Error: Source file requires different compiler version (current compiler is 0.5.10+commit.5a6ea5b1.Windows.msvc - note that nightly builds are considered to be strictly less than the released version
pragma solidity ^0.4.25;

change the pragma solidity >0.4.25 then get more errors.
please update solidity file.

Could not resolve org.ethereum:solcJ-all:0.4.25.

Hi, I met an error at loading Gradle changes, and I didn't modify any of the code.

`
A problem occurred configuring root project 'sample-project-gradle'.

Failed to notify project evaluation listener.
Could not resolve all files for configuration ':compileClasspath'.
> Could not resolve org.ethereum:solcJ-all:0.4.25.
Required by:
project :
> Could not resolve org.ethereum:solcJ-all:0.4.25.
> Could not get resource 'https://dl.bintray.com/ethereum/maven/org/ethereum/solcJ-all/0.4.25/solcJ-all-0.4.25.pom'.
> Could not GET 'https://dl.bintray.com/ethereum/maven/org/ethereum/solcJ-all/0.4.25/solcJ-all-0.4.25.pom'. Received status code 403 from server: Forbidden
Task with name 'compileSolidity' not found in root project 'sample-project-gradle'.

Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.
`

generateLightNewWalletFile no such algorithm ECDSA for provider BC

Hello in Android 8, SDK 28 running this error:
WalletUtils.generateLightNewWalletFile("", File(path))

"no such algorithm ECDSA for provider BC"

Sign plain text message with private key to genreate signature

Can we sign a plain text message with private key to get the signature using this library?

Issues and solutions I've taken

Foreword: many issues can be fixed by applying certain steps from the Getting Started guide.

No Greeter.java (wrapper code)
Solution:

Download Solicity compiler (check the .sol file for version, currently 0.4.25 is needed for the file) and web3j cli.
Follow this guide to generate the Java code you need

Cannot resolve 'ethLogFlowable'
Solution: add into build.gradle

compile ('org.web3j:core:4.1.0') (Java 8)
compile ('org.web3j:core:4.1.0-android') (Android)

RxJava dependency missing
Solution: add into build.gradle

implementation "io.reactivex.rxjava2:rxjava:2.x.y"
With x and y replaced by the version number found here.

can't import org.web3j.sample.contracts.generated.Greeter

Hi,

I loaded this project in eclipse to run. But eclipse didn`t find all libaries.
Could you Show me where I can find this libary?

"org.web3j.sample.contracts.generated.Greeter"

Thanks for your help.

Sample project is not updated to 3.4

After modifying the gradle file in the project, the sample project doesn't run.

Is there any gradle startup script for MacOs?

3.1.1 gradle issue

File Path Query?

23:37:29.041 [main] INFO org.web3j.sample.Application - Please enter your wallet file path
----------------------------?
23:38:45.511 [main] INFO org.web3j.sample.Application - Enter password
----------------------------?

solc. finished with non-zero exit value 1

I am using this sample app to experiment with my own contracts. My own contracts require solidity compiler 0.5.0+, so I've changed the gradle file to set the solidty version correspondingly.

pragma solidity ^0.5.0;
contract XXX {...}

web3j {
    ...
    solidity {
        version = '0.5.0'
    }
}

When I start the gradle build I always get the following error:
Execution failed for task ':compileSolidity'.

Process 'command '/var/folders/4d/rwvvzqh10nx5x9qg3yw8jsz00000gn/T/solc/solc'' finished with non-zero exit value 1

If I set pragma to
pragma solidity ^0.4.0;

it works. It seems to me the build process is not respecting the solidity version set.

Getting org.bouncycastle.jce.provider Exception

it is working well in my localhost but when deployed to server it throws following exception.

java.lang.ClassCastException: org.bouncycastle.jce.provider.JCEECPrivateKey cannot be cast to org.bouncycastle.jcajce.provider.asymmetric.ec.BCECPrivateKey

SSL peer shut down incorrectly

There is an issue during the first import of the project.

SSL peer shut down incorrectly

The same has happened when I add id 'org.web3j' version '4.6.0' to my project. During work on this issue for adding plugin into my project I reach the point where I need to tell server to use old version of TLS, but I have not been managed to make it work.

`Gradle 7.3.3

Build time: 2021-12-22 12:37:54 UTC
Revision: 6f556c80f945dc54b50e0be633da6c62dbe8dc71

Kotlin: 1.5.31
Groovy: 3.0.9
Ant: Apache Ant(TM) version 1.10.11 compiled on July 10 2021
JVM: 16.0.1 (Oracle Corporation 16.0.1+9-24)
OS: Linux 5.4.0-126-generic amd64
`

Sample contract is not deployed. Not enough gas

Transfer transaction works OK, but deploy fails. What's wrong?
Source code:
ContractGasProvider contractGasProvider = new DefaultGasProvider();
try {

        contract = Greeter.deploy(
                web3j, credentials,
                contractGasProvider,
                "Hello!"
        ).send();
        contractAddress  = contract.getContractAddress();
        System.out.printf("Contract Address : " + contract.getContractAddress());
    } catch(Exception e){
        e.printStackTrace();
    }

08:34:34.908 [main] INFO org.web3j.sample.Application - Deploying smart contract
org.web3j.protocol.exceptions.TransactionException: Transaction has failed with status: 0x0. Gas used: 4300000. (not-enough gas?)
at org.web3j.tx.Contract.executeTransaction(Contract.java:290)
at org.web3j.tx.Contract.create(Contract.java:326)
at org.web3j.tx.Contract.deploy(Contract.java:355)
at org.web3j.tx.Contract.lambda$deployRemoteCall$7(Contract.java:449)
at org.web3j.protocol.core.RemoteCall.send(RemoteCall.java:30)
at org.web3j.sample.Application.run(Application.java:124)
at org.web3j.sample.Application.main(Application.java:67)
Exception in thread "main" java.lang.NullPointerException
at org.web3j.sample.Application.run(Application.java:144)
at org.web3j.sample.Application.main(Application.java:67)
Disconnected from the target VM, address: '127.0.0.1:62773', transport: 'socket'