Top 10 Java Libraries & Tools for Machine Learning

November 13, 2023

As the world delves deeper into the realms of artificial intelligence and machine learning, the need for robust and efficient tools to harness the power of data has never been greater. Java, known for its portability, versatility, and performance, offers an array of libraries and tools that are instrumental in building machine learning models. Here’s a curated list of the top 10 Java libraries and tools that are a must-have in any developer’s machine learning toolkit.

Table of Contents

What are the 10 Java Libraries and Tools for Machine Learning?


Deeplearning4j (DL4J) is the trailblazer when it comes to deep learning in Java. It’s a comprehensive and flexible suite that provides a range of deep learning algorithms, making it a favorite for Java developers. DL4J seamlessly integrates with Hadoop and Apache Spark, making it an excellent choice for big data projects. It’s a versatile tool, catering to the needs of various domains from image recognition to fraud detection.


  • Scalable on Hadoop and Spark for big data applications.
  • Supports various deep learning architectures like CNNs, RNNs, and RBMs.
  • Provides GPU support for accelerated computations.


  • Used in business environments for fraud detection and image recognition.
  • Integrates with other Java-centric platforms for a seamless development experience.
  • Serves as a tool for deep learning in production settings.


The Waikato Environment for Knowledge Analysis, better known as Weka, is a collection of machine learning algorithms tailored for data mining tasks. It’s user-friendly, providing a graphical user interface for exploring and visualizing data. Weka supports various tasks such as clustering, classification, regression, and more, making it a versatile tool for data analysts and researchers.


  • Provides algorithms for data pre-processing, classification, regression, clustering, and association rules.
  • Equipped with tools for data visualization and model evaluation.
  • Offers an extensible platform through custom plugins.


  • Ideal for educational and research purposes due to its comprehensive collection of algorithms.
  • Enables quick prototyping and analysis of data for data scientists.
  • Facilitates the development of new ML schemes.

MOA (Massive Online Analysis)

MOA is a real treasure for those working with data streams. It’s a framework designed for online or real-time analysis of evolving data. MOA is capable of handling massive data streams, making it perfect for applications that require real-time predictions, like stock market analysis or IoT sensor data monitoring.


  • Specializes in mining big data streams and evolving data.
  • Includes a collection of machine learning algorithms and tools for evaluation.
  • Efficient and scalable for real-time analytics.


  • Useful for real-time analytics in IoT, monitoring systems, and financial markets.
  • Can handle massive volumes of streaming data with minimal delay.


MALLET, which stands for Machine Learning for Language Toolkit, is a gem for natural language processing. It offers a range of algorithms for document classification, clustering, topic modeling, and more. MALLET is particularly praised for its implementation of Latent Dirichlet Allocation (LDA), a popular topic modeling technique.


  • Includes sophisticated tools for document classification and clustering.
  • Offers an efficient implementation of the Latent Dirichlet Allocation (LDA).
  • Supports complex machine learning applications like topic modeling.


  • Ideal for text analytics and natural language processing.
  • Utilized in social media analysis, sentiment analysis, and topic discovery.


Smile stands for Statistical Machine Intelligence and Learning Engine. It’s a comprehensive machine learning library that brings a smile to the face of Java developers with its rich set of algorithms and data structures for both supervised and unsupervised learning. Smile is known for its speed and efficiency, making it a go-to for high-performance applications.


  • Comprehensive machine learning library with a focus on speed and efficiency.
  • Supports classification, regression, clustering, association rule, and feature selection.
  • Easy to use with a well-documented API.


  • Suitable for projects requiring high-speed data processing and analysis.
  • Can be integrated into production systems for real-time analytics.


Encog is a versatile tool that specializes in neural networks and machine learning. It supports various network architectures, including feedforward, convolutional, and recurrent neural networks. Encog is praised for its simplicity and ease of use, making it accessible to both beginners and seasoned developers.


  • Supports various neural network architectures, including feedforward, RBF, and Hopfield.
  • Offers tools for preprocessing data and evaluating model performance.
  • Provides GPU support for efficient computations.


  • Popular in both research and industrial settings for pattern recognition.
  • Used for financial forecasting, robotics, and healthcare analysis.

Apache Mahout

Apache Mahout is a powerhouse for scalable machine learning. It’s designed to work with Apache Hadoop, making it suitable for handling large datasets. Mahout provides algorithms for clustering, classification, and collaborative filtering, making it a versatile tool for big data analytics.


  • Focuses on collaborative filtering, clustering, and classification.
  • Integrates with Apache Hadoop for distributed processing.
  • Provides a rich set of pre-built algorithms.


  • Ideal for big data analytics requiring scalable machine learning solutions.
  • Used in e-commerce for recommendation engines and customer segmentation.


DL4J-NLP is a natural language processing library that’s part of the Deeplearning4j ecosystem. It’s designed for working with human language data, providing tools for tokenization, vectorization, and sentiment analysis. DL4J-NLP is a powerful tool for building chatbots, sentiment analyzers, and other language-aware applications.


  • Provides tools for tokenization, stemming, and sentiment analysis.
  • Offers vector space modeling and word2vec capabilities.
  • Seamlessly integrates with DL4J for deep learning applications.


  • Utilized in building chatbots, sentiment analyzers, and automated customer support.
  • Assists in the extraction of insights from large text corpora.


JPMML (Java Predictive Modeling Markup Language) is a library that allows for the deployment of machine learning models. It converts models trained in popular data science tools like R, Python, and Spark into PMML, a standard markup language for predictive models, making them easily deployable in Java environments.


  • Facilitates the deployment of machine learning models across different platforms and applications.
  • Supports a wide range of machine learning models and algorithms.
  • Offers a standardized way of representing predictive models.


  • Used for operationalizing machine learning models in Java environments.
  • Enables the seamless transition of models from development to production.


Tribuo is a comprehensive machine learning library developed by Oracle Labs. It provides a uniform interface for different types of machine learning tasks such as classification, regression, clustering, and anomaly detection. It also includes model evaluation and feature transformation tools, making it a well-rounded library for machine learning projects.


  • Provides tools for classification, regression, clustering, and anomaly detection.
  • Includes model evaluation and feature transformation utilities.
  • Designed to be robust and production-ready.



These Java libraries and tools are the cogs and wheels that drive the machine learning engine. Each tool has its unique strengths and applications, and together, they provide a robust environment for tackling machine learning challenges. Whether you’re a seasoned data scientist or a developer venturing into the world of machine learning, these tools are sure to be invaluable assets in your development arsenal. Unlock the power of innovation for your projects by hiring our seasoned Java developers. To know more in detail contact with Carmatec.