feat: refactor the Java SDK (#72)

* feat: refactor the Java SDK

* fix: remove redundancy

* fix: missing content

* fix: update links

* fix: minor update

content/sdk/00.index.md

@@ -34,11 +34,11 @@ These SDKs, available in various programming languages, streamline the process o
 
 - **Scalability**: Massively reduced transaction fees and faster confirmation times compared to Ethereum.
 - **Security**: Inherits security from the underlying Ethereum blockchain.
-- **Enhanced User Experience**: Enables smoother and more cost-effective dApp interactions for users.
-- **Paymaster Support**: Enables flexible transaction fee payment strategies:
+- **Enhanced user experience**: Enables smoother and more cost-effective dApp interactions for users.
+- **Paymaster support**: Enables flexible transaction fee payment strategies:
   - Third-party services can cover fees for users, fostering wider adoption.
   - Gasless transactions become possible, improving user experience.
-- **Account Abstraction**:
+- **Account abstraction**:
   - Enhances security and privacy by separating user accounts from keys.
   - Improves developer experience by simplifying account management and enabling features like multi-signature wallets
     and on-chain governance.
@@ -82,7 +82,7 @@ Explore Nuxt built-in components for pages, layouts, head, and more.
 ---
 title: Java
 icon: i-heroicons-rectangle-group
-to: /sdk/java/getting-started
+to: /sdk/java/introduction/overview
 ---
 Integrate ZKsync Era with Java for cost-effective transactions.
 ::

content/sdk/30.python/02.api/00.providers/00.introduction.md

@@ -1,6 +1,6 @@
 ---
 title: Introduction
-description: Overview of Web3Providers and their functions.
+description: Overview of Web3Providers and their functions
 tags: ["web3", "blockchain", "provider", "zksync"]
 ---
 

content/sdk/30.python/02.api/00.providers/01.providers.md → content/sdk/30.python/02.api/00.providers/01.provider.md

@@ -1,5 +1,5 @@
 ---
-title: Providers
+title: Provider
 description: Web3Provider for ZKsync Python SDK
 tags: ["web3", "blockchain", "provider", "zksync"]
 ---

content/sdk/40.java/00.introduction/00.overview.md

@@ -0,0 +1,45 @@
+---
+title: Overview
+description: An introduction to zksync2-java and its features.
+tags: ["zksync", "java", "sdk", "blockchain", "ethereum"]
+---
+
+The `zksync2-java` is a powerful tool designed for developers working with the Ethereum blockchain.
+
+## What is `zksync2-java`?
+
+The `zksync2-java` library is a Java SDK designed to facilitate interactions with the ZkSync Era network. It provides a
+set of tools and methods that allow developers to:
+
+- Connect to the ZkSync network using a Web3 provider.
+- Estimate transaction fees and gas usage.
+- Interact with smart contracts deployed on ZkSync.
+- Retrieve detailed information about transactions, blocks, and accounts.
+- Utilize ZkSync-specific functionalities such as L1 to L2 transactions, bridge contracts, and more.
+
+## Key features
+
+### Seamless integration with web3j
+
+The `zksync2-java` library builds upon the `web3j` library, ensuring that developers familiar with Web3j can easily
+transition to using ZkSync-specific features. It supports all the standard Web3j functionalities while adding
+additional methods tailored to the ZkSync Era.
+
+### ZkSync-specific methods
+
+The library includes a variety of methods specific to ZkSync, such as:
+
+- Estimating fees for transactions (`estimateFee`).
+- Calculating gas usage for transactions (`estimateGas`, `estimateGasL1`).
+- Retrieving account balances and block details.
+- Managing transactions between Layer 1 (L1) and Layer 2 (L2).
+- Accessing bridge contracts and batch details.
+
+### Ease of use
+
+The `zksync2-java` library is designed with simplicity in mind, offering straightforward APIs and
+documentation to help developers get started quickly and efficiently.
+
+::callout{icon="i-heroicons-light-bulb"}
+To get started with Java, follow the [installation instructions](/sdk/java/introduction/installation) provided.
+::

content/sdk/40.java/00.introduction/01.why-java-sdk.md

@@ -0,0 +1,32 @@
+---
+title: Why zksync2-java
+description: Benefits and Advantages of zksync2-java
+tags: ["zksync", "java", "ethereum", "layer-2", "zero-knowledge rollups"]
+---
+
+Choosing the Java SDK for ZKSync opens up a plethora of opportunities for businesses and developers eager to explore
+the next generation of blockchain applications.
+
+Here are key reasons why `zksync2-java` is a valuable addition to your development toolkit:
+
+### Seamless web3 integration
+
+- **Built on web3j**: The library extends `web3j`, making it easy for developers familiar with Web3j to start using
+ZkSync-specific features without a steep learning curve.
+- **Standard and extended functionality**: It supports all standard Web3j functionalities while adding methods unique
+to ZkSync Era, enabling more versatile blockchain interactions.
+
+### ZkSync-specific enhancements
+
+- **Layer 2 transactions**: Leverage the power of zk-rollups for low-cost, high-throughput transactions.
+- **Advanced fee and gas estimation**: Precisely estimate transaction fees and gas usage with methods
+like `estimateFee`, `estimateGas`, and `estimateGasL1`.
+- **Comprehensive account and block management**: Retrieve detailed information about accounts, blocks, and
+transactions on the ZkSync network.
+- **Bridge contract access**: Easily interact with ZkSync Era bridge contracts for L1 to L2 operations.
+
+### User-friendly design
+
+- **Easy initialization**: Quickly set up your provider with minimal configuration.
+- **Clear and concise API**: The library's API is designed for simplicity and ease of use, ensuring you can integrate
+it into your projects with minimal effort.

content/sdk/40.java/00.introduction/02.installation.md

@@ -0,0 +1,46 @@
+---
+title: Installation
+description: How to install and set up zksync2-java for your project.
+tags: ["zksync", "java", "sdk installation"]
+---
+
+Integrating the `zksync2-java` into your Java project equips you with the tools necessary to interact with the
+ZKSync Layer-2 blockchain solution efficiently.
+
+## Prerequisites
+
+Before beginning the installation, make sure you have:
+
+- **Java Development Kit (JDK)**: Java 8 or higher installed on your machine.
+- **Maven or Gradle**: Depending on your project's build system, ensure Maven or Gradle is set up correctly.
+
+::callout{icon="i-heroicons-light-bulb"}
+Check out the [Java installation guide](https://www.java.com/en/download) for more information.
+::
+
+## Installation steps
+
+### Maven setup
+For projects using Maven, add the following dependency block to your `pom.xml` file to include the `zksync2-java` SDK:
+
+```xml
+<project>
+  ...
+  <dependencies>
+    <dependency>
+      <groupId>io.zksync</groupId>
+      <artifactId>zksync2</artifactId>
+      <version>v0.2.0</version>
+    </dependency>
+  </dependencies>
+</project>
+```
+
+### Gradle setup
+For projects utilizing Gradle, add the dependency to your `build.gradle` file as follows:
+
+```groovy
+dependencies {
+    implementation "io.zksync:zksync2:v0.2.0"
+}
+```

content/sdk/40.java/01.guides/00.getting-started.md

@@ -0,0 +1,55 @@
+---
+title: Getting Started
+description: Getting started with zksync2-java
+tag: ["zksync", "java", "blockchain development", "layer-2", "zero-knowledge rollups"]
+---
+
+This guide is designed to help you quickly get up and running with the SDK, enabling you to interact with the ZKSync
+Era blockchain efficiently.
+
+## Understanding key components
+
+Before delving into code examples, it's useful to familiarize yourself with the primary objects provided by the SDK and
+their responsibilities:
+
+- **`ZkSync`**: This class provides the connection to the ZKSync Era blockchain. It allows you to query blockchain
+states, such as account details, block or transaction information, and event logs. It also facilitates read-only
+interactions with the blockchain through calls and enables writing to the blockchain by sending transactions.
+- **`Wallet`**: This object encapsulates all operations that interact with a user account. It manages the account's
+private key, which is used to sign various types of payloads, and offers straightforward methods for executing common
+blockchain functions.
+
+::callout{icon="i-heroicons-light-bulb"}
+Ensure you have installed the `zksync2-java` SDK. If you still need to do so, please refer to
+the [installation guide](/sdk/java/introduction/installation) for detailed instructions.
+::
+
+## Examples
+
+Connect to the ZKsync Era network:
+
+```java
+import io.zksync.protocol.ZkSync;
+import org.web3j.protocol.http.HttpService;
+
+public class Main {
+    public static void main(String ...args) {
+        ZkSync zksync = ZkSync.build(new HttpService("http://127.0.0.1:3050"));
+    }
+}
+```
+
+Get the latest block number:
+
+```java
+BigInteger blockNumber = zksync.ethBlockNumber().send().getBlockNumber();
+;
+```
+
+```java
+ZksBlock block = zksync.zksGetBlockByHash("0xb472c070c9e121ba42702f6c322b7b266e287a4d8b5fa426ed265b105430c397", true).send().getBlock();
+```
+
+```java
+ZkTransaction transaction = zksync.zksGetTransactionByHash("0x9af27afed9a4dd018c0625ea1368afb8ba08e4cfb69b3e76dfb8521c8a87ecfc").send().getResult();
+```

content/sdk/40.java/01.features.md → content/sdk/40.java/01.guides/01.features.md

@@ -1,6 +1,7 @@
 ---
 title: ZKsync Era Features
-description:
+description: An overview of ZKsync Era features
+tags: ["zksync", "java", "ethereum", "blockchain", "eip-712", "paymaster", "sdk"]
 ---
 
 While ZKsync is mostly Web3-compatible, it has some differences compared to Ethereum. The major of those are:
@@ -11,10 +12,11 @@ While ZKsync is mostly Web3-compatible, it has some differences compared to Ethe
 
 These require us to extend standard Ethereum transactions with new custom fields.
 Such extended transactions are called EIP712 transactions since [EIP712](https://eips.ethereum.org/EIPS/eip-712)
-is used to sign them. You can look at the internal structure of the EIP712 transactions
-[here](https://docs.zksync.io/zk-stack/concepts/transaction-lifecycle#eip-712-0x71).
+is used to sign them. You can look at the internal structure of the [EIP712 transactions](https://docs.zksync.io/zk-stack/concepts/transaction-lifecycle#eip-712-0x71).
 
+::callout{icon="i-heroicons-light-bulb"}
 This document will focus solely on how to pass these arguments to the SDK.
+::
 
 ## Encoding paymaster params
 
@@ -24,4 +26,4 @@ the Matter Labs team endorses certain types of
 that are processable by EOAs.
 
 ZKsync SDK provides a utility method that can be used to get the correctly formed `paymasterParams` object:
-[approvalBased](/sdk/java/paymaster-utils#encodeapprovalbased), [general](/sdk/java/paymaster-utils#encodegeneral).
+[approvalBased](/sdk/java/api/utilities/paymaster-utils#encodeapprovalbased), [general](/sdk/java/api/utilities/paymaster-utils#encodegeneral).

content/sdk/40.java/04.accounts-l1-l2.md → content/sdk/40.java/01.guides/02.accounts-l1-l2.md

@@ -1,9 +1,10 @@
 ---
-title: Accounts | L1<->L2 Transactions
-description:
+title: L1<->L2 Transactions
+description: Methods for handling transactions between L1 and L2 networks on ZKsync
+tags: ["zksync", "l1", "l2", "transactions", "java", "sdk"]
 ---
 
-This section explores the methods which allow the [account](/sdk/java/accounts) to send transactions
+This section explores the methods which allow the [account](/sdk/java/api/accounts/wallet) to send transactions
 among both L1 to L2 networks.
 
 If you want some background on how L1<->L2 interaction works on ZKsync, go through the
@@ -12,25 +13,25 @@ If you want some background on how L1<->L2 interaction works on ZKsync, go throu
 ## Deposit
 
 `Wallet` and `L1Signer` objects provide a deposit workflow.
-For more information, please refer to the method specification [`Deposit`](/sdk/java/accounts#deposit).
+For more information, please refer to the method specification [`Deposit`](/sdk/java/api/accounts/wallet#deposit).
 
 For a complete example of how to execute the deposit workflow, take a look at the following:
 [Deposit ETH and ERC20 token](https://github.com/zksync-sdk/zksync2-examples/blob/main/js/src/01_deposit.ts).
 
 ## Request execute
 
 `Wallet` and `L1Signer` objects provide an option to request execution of L2 transaction from L1.
-For more information, please refer to the method specification [`requestExecute`](/sdk/java/accounts#requestexecute).
+For more information, please refer to the method specification [`requestExecute`](/sdk/java/api/accounts/wallet#requestexecute).
 
 ## Base cost
 
 `Wallet` and `L1Signer` objects provide an option to calculate base cost for L2 transaction.
-For more information, please refer to the method specification [`getBaseCost`](/sdk/java/accounts#getbasecost).
+For more information, please refer to the method specification [`getBaseCost`](/sdk/java/api/accounts/wallet#getbasecost).
 
 ## Withdrawal
 
 `Wallet` and `Signer` objects provide a withdrawal workflow.
-For more information, please refer to the method specification [`Deposit`](/sdk/java/accounts#deposit).
+For more information, please refer to the method specification [`Deposit`](/sdk/java/api/accounts/wallet#deposit).
 
 For a complete example of how to execute the deposit workflow, take a look at the following:
 [Withdraw ETH and ERC20 token](https://github.com/zksync-sdk/zksync2-examples/blob/main/js/src/04_withdraw.ts).

content/sdk/40.java/02.api/00.providers/00.introduction.md

@@ -0,0 +1,20 @@
+---
+title: Introduction
+description: Overview of Web3Providers and their functions.
+tags: ["web3", "blockchain", "provider", "zksync"]
+---
+
+A Web3 Provider object provides application-layer access to underlying blockchain networks. It serves as a crucial
+interface for interacting with various blockchain functionalities, enabling developers to connect, communicate, and
+perform operations on the blockchain.
+
+The [`zksync2-java`](https://github.com/zksync-sdk/zksync2-java) library supports provider methods from
+the [`web3j`](https://docs.web3j.io/4.9.7/) library and supplies additional functionality tailored for the ZKsync Era network.
+
+### Key features
+
+- **Network connectivity:** Establishes connections to blockchain networks, allowing applications to interact with them.
+- **Transaction management:** Facilitates the creation, sending, and tracking of transactions.
+- **Gas estimation:** Provides estimations for the amount of gas required for transactions.
+- **Account management:** Retrieves balances and transaction histories for accounts.
+- **Contract interaction:** Enables interaction with smart contracts, including deploying and calling contract methods.