Top 10 Alibaba Open‑Source Projects Every Java Developer Should Know

Hello, I am Su San, and during the recent holiday I curated a list of ten Alibaba open‑source projects that I have used or seen colleagues use, which are valuable for Java development.

1. Druid

Druid claims to be the best Java database connection pool, offering powerful monitoring and extension capabilities.

Main advantages:

It can monitor database access performance.

It provides WallFilter for SQL‑injection defense based on semantic analysis.

It offers multiple ways to detect connection leaks.

It supports database password encryption.

It can print SQL execution logs.

GitHub: https://github.com/alibaba/druid

Maven Central: https://mvnrepository.com/artifact/com.alibaba/druid

Configure Maven dependency:

<dependency>
  <groupId>com.alibaba</groupId>
  <artifactId>druid</artifactId>
  <version>${druid-version}</version>
</dependency>

2. fastjson

fastjson is Alibaba's open‑source JSON parsing library that can serialize Java beans to JSON strings and deserialize JSON strings back to Java beans.

Main advantages:

Fast performance that has not been surpassed by other Java JSON libraries since its first release.

Widely used across Alibaba’s massive infrastructure and recognized as a popular open‑source tool.

Simple and concise API.

Comprehensive features: generic support, stream processing of large texts, enum handling, and extensible serialization/deserialization.

// serialization
String text = JSON.toJSONString(obj);
// deserialization
VO vo = JSON.parseObject("{...}", VO.class);

GitHub: https://github.com/alibaba/fastjson

Maven Central: https://mvnrepository.com/artifact/com.alibaba/fastjson

Configure Maven dependency:

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.76</version>
</dependency>

3. Dubbo

Apache Dubbo is a microservice framework that provides RPC communication and service governance capabilities, enabling remote discovery, load balancing, traffic routing, and more.

It is highly extensible, allowing customization at almost any point.

Main advantages:

Transparent interface‑based RPC.

Intelligent load balancing.

Automatic service registration and discovery.

High extensibility.

Runtime traffic routing.

Visual service governance.

Cloud‑native friendliness.

GitHub: https://github.com/apache/dubbo

Maven Central: https://mvnrepository.com/artifact/com.alibaba/dubbo/

Configure Maven dependency:

<properties>
    <dubbo.version>3.0.3</dubbo.version>
</properties>

<dependencies>
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo</artifactId>
        <version>${dubbo.version}</version>
    </dependency>
    <dependency>
        <groupId>org.apache.dubbo</groupId>
        <artifactId>dubbo-dependencies-zookeeper</artifactId>
        <version>${dubbo.version}</version>
        <type>pom</type>
    </dependency>
</dependencies>

4. RocketMQ

Apache RocketMQ is a distributed messaging and streaming platform with low latency, high performance, and high reliability.

Key features include multiple messaging patterns, financial‑grade transaction messages, built‑in fault tolerance, cross‑language clients, pluggable transport protocols, message tracing, big‑data integration, and flexible horizontal scaling.

GitHub: https://github.com/apache/rocketmq

Maven Central: https://mvnrepository.com/artifact/org.apache.rocketmq/rocketmq-spring-boot-starter

Configure Maven dependency:

<dependency>
    <groupId>org.apache.rocketmq</groupId>
    <artifactId>rocketmq-client</artifactId>
    <version>4.3.0</version>
</dependency>

5. Arthas

Arthas is Alibaba’s open‑source Java diagnostic tool that helps developers troubleshoot class loading issues, code execution problems, JVM runtime status, and more.

It supports JDK 6+, runs on Linux, macOS, and Windows, and provides a command‑line interface with tab completion.

GitHub: https://alibaba.github.io/arthas/

Maven Central: https://mvnrepository.com/artifact/com.taobao.arthas/arthas-spring-boot-starter

Start Arthas on the target machine:

curl -O https://arthas.aliyun.com/arthas-boot.jar
java -jar arthas-boot.jar

6. Nacos

Nacos is an easy‑to‑use platform for dynamic service discovery, configuration management, and service management, helping you build cloud‑native applications.

It treats services as first‑class citizens and supports Dubbo, gRPC, Spring Cloud RESTful, and Kubernetes services.

Four core functions:

Service discovery and health checking.

Dynamic configuration management.

Dynamic DNS service with weighted routing.

Service and metadata management via a dashboard.

GitHub: https://github.com/alibaba/nacos

Maven Central: https://mvnrepository.com/artifact/com.alibaba.cloud/spring-cloud-starter-alibaba-nacos-discovery

7. EasyExcel

EasyExcel rewrites POI’s handling of Excel 2007+ files, reducing memory consumption dramatically (e.g., a 3 MB file reads in a few megabytes of RAM).

It offers high‑performance reading and writing, supporting both .xlsx and .xls formats.

GitHub: https://github.com/alibaba/easyexcel

Maven Central: https://mvnrepository.com/artifact/com.alibaba/easyexcel

Configure Maven dependency:

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>2.2.6</version>
</dependency>

8. Sentinel

Sentinel focuses on traffic control, shaping, circuit breaking, and system adaptive protection to ensure microservice reliability and resilience.

Key features include rich usage scenarios, real‑time monitoring, extensive ecosystem integration, multi‑language support, and easy SPI extensions.

GitHub: https://github.com/alibaba/Sentinel

Maven Central: https://mvnrepository.com/artifact/com.alibaba.csp/sentinel-core

Configure Maven dependency:

<dependency>
    <groupId>com.alibaba.csp</groupId>
    <artifactId>sentinel-core</artifactId>
    <version>1.8.2</version>
</dependency>

9. Otter

Otter is a data synchronization solution originally built for Alibaba B2B, supporting heterogeneous database sync, single‑site sync, cross‑site sync, bidirectional sync, and file sync.

It handles massive data volumes (e.g., 600 million rows, 1.5 TB of files) across dozens of databases and dozens of machines.

GitHub: https://github.com/alibaba/otter

Maven Central: https://mvnrepository.com/artifact/com.alibaba.otter/canal.client

10. P3C

P3C implements Alibaba’s Java coding guidelines, providing PMD rules and IDE plugins (IntelliJ IDEA, Eclipse) to enforce best practices such as avoiding deprecated APIs, using @Override, referencing static members via class name, and correctly overriding hashCode/equals.

GitHub: https://github.com/alibaba/p3c/tree/master/idea-plugin

11. Spring Cloud Alibaba

Spring Cloud Alibaba offers a one‑stop solution for building distributed applications, integrating components such as Sentinel, Nacos, RocketMQ, Dubbo, Seata, OSS, SchedulerX, and SMS.

It provides traffic control, service registration and discovery, distributed configuration, event‑driven architecture, distributed transactions, and cloud services.

GitHub: https://github.com/alibaba/spring-cloud-alibaba

Configure Maven dependency management:

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.alibaba.cloud</groupId>
            <artifactId>spring-cloud-alibaba-dependencies</artifactId>
            <version>2.2.6.RELEASE</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

These ten Alibaba open‑source projects provide developers with robust, high‑performance tools for building modern, cloud‑native Java applications.