### Install Web3j CLI on Windows

Source: https://github.com/lfdt-web3j/web3j/blob/main/README.md

Use this PowerShell command to install the Web3j command line interface on Windows.

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

--------------------------------

### Install Web3j CLI on Unix

Source: https://github.com/lfdt-web3j/web3j/blob/main/README.md

Use this command to install the Web3j command line interface on Unix-based systems.

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

--------------------------------

### Create a New Web3j Project

Source: https://github.com/lfdt-web3j/web3j/blob/main/README.md

Run this command to initialize a new project using the Web3j CLI.

```shell
$ web3j new 
```

--------------------------------

### Run Web3j Build Commands

Source: https://github.com/lfdt-web3j/web3j/blob/main/README.md

Commands for executing builds and managing integration tests via Gradle.

```bash
$ ./gradlew check
```

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

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

--------------------------------

### Generate Web3j Wrapper Class

Source: https://github.com/lfdt-web3j/web3j/blob/main/core/src/main/resources/solidity/readme.txt

Generate a Java wrapper class for a Solidity smart contract using the web3j CLI. Specify the ABI file, the base package for the generated class, and the output directory.

```bash
web3j generate solidity -a ${fileName}.abi -p org.web3j.ens.contracts.generated -o ../../../../../main/java/ > /dev/null
```

--------------------------------

### Generate ABI File with Solc

Source: https://github.com/lfdt-web3j/web3j/blob/main/core/src/main/resources/solidity/readme.txt

Use the solc compiler to generate the binary and ABI files for a Solidity contract. Ensure the contract file is in the specified location and the output directory is set.

```bash
solc --bin --abi --optimize --overwrite ${fileName}.sol -o build/
```

--------------------------------

### Add Web3j Dependency (Gradle)

Source: https://github.com/lfdt-web3j/web3j/blob/main/README.md

Use these snippets to include Web3j in your Gradle build file for Java or Android projects.

```groovy
implementation ('org.web3j:core:5.0.3')
```

```groovy
implementation ('org.web3j:core:4.12.3-android')
```

--------------------------------

### Proposal PR Template for Web3j Maintainer

Source: https://github.com/lfdt-web3j/web3j/blob/main/MAINTAINERS.md

Use this Markdown template when creating a Pull Request to propose a new maintainer for the Web3j project. It includes placeholders for the maintainer's handle, achievements, and a link to their contributions.

```markdown
I propose to add [maintainer github handle] as a Web3J project maintainer.

[maintainer github handle] contributed with many high quality commits:

- [list significant achievements]

Here are [their past contributions on Web3J project](https://github.com/hyperledger/web3j/commits?author=[user github handle]).

Voting ends two weeks from today.

For more information on this process see the Becoming a Maintainer section in the MAINTAINERS.md file.
```

--------------------------------

### Add Web3j Android Dependency (Maven)

Source: https://github.com/lfdt-web3j/web3j/blob/main/README.md

Use this XML snippet to include the Web3j Android core library in a Maven project.

```xml
<dependency>
  <groupId>org.web3j</groupId>
  <artifactId>core</artifactId>
  <version>4.12.3-android</version>
</dependency>
```

--------------------------------

### Add Web3j Dependency to Maven

Source: https://github.com/lfdt-web3j/web3j/blob/main/README.md

Include this dependency in your pom.xml file to use Web3j in your Java project.

```xml
<dependency>
  <groupId>org.web3j</groupId>
  <artifactId>core</artifactId>
  <version>5.0.3</version>
</dependency>
```

--------------------------------

### Keep BouncyCastle Classes

Source: https://github.com/lfdt-web3j/web3j/wiki/Android-ProGuard-rules-for-web3j-android

Configure ProGuard to keep BouncyCastle classes, especially for specific SPIs and helpers.

```proguard
#-keep class org.bouncycastle.**
-dontwarn org.bouncycastle.jce.provider.X509LDAPCertStoreSpi
-dontwarn org.bouncycastle.x509.util.LDAPStoreHelper
```

--------------------------------

### Suppress SafeVarargs and SLF4j Warnings

Source: https://github.com/lfdt-web3j/web3j/wiki/Android-ProGuard-rules-for-web3j-android

Use these rules to avoid warnings related to `java.lang.SafeVarargs` and SLF4j logging framework.

```proguard
#-dontwarn java.lang.SafeVarargs
-dontwarn org.slf4j.**
```

--------------------------------

### Ignore Java8 Warnings

Source: https://github.com/lfdt-web3j/web3j/wiki/Android-ProGuard-rules-for-web3j-android

Use this rule to prevent ProGuard from warning about Java 8 specific utilities.

```proguard
-dontwarn java8.util.**
```

--------------------------------

### Keep Web3j Classes for Jackson Serialization

Source: https://github.com/lfdt-web3j/web3j/wiki/Android-ProGuard-rules-for-web3j-android

Ensure Web3j classes used with Jackson for reflection-based serialization are kept.

```proguard
-keepclassmembers class org.web3j.protocol.** { ; }
-keepclassmembers class org.web3j.crypto.* { *; }
```

--------------------------------

### Ignore JNR Posix Warnings

Source: https://github.com/lfdt-web3j/web3j/wiki/Android-ProGuard-rules-for-web3j-android

Add this rule to suppress warnings related to the JNR Posix library.

```proguard
-dontwarn jnr.posix.**
```

--------------------------------

### Keep Web3j ABI Types

Source: https://github.com/lfdt-web3j/web3j/wiki/Android-ProGuard-rules-for-web3j-android

Preserve Web3j types that are used for runtime data extraction from type names, such as integer sizes.

```proguard
-keep class * extends org.web3j.abi.TypeReference
-keep class * extends org.web3j.abi.datatypes.Type
```

--------------------------------

### Ignore JFFI Rules

Source: https://github.com/lfdt-web3j/web3j/wiki/Android-ProGuard-rules-for-web3j-android

This rule is for ignoring warnings related to the JFFI library.

```proguard
#-dontwarn com.kenai.**
```

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