Download Jigsaw: The W3C's Java Server Platform

Jigsaw Java Download: How to Install and Use the Modular Java Platform

If you are a Java developer or user, you might have heard of Jigsaw, a project that aims to make Java more modular and scalable. But what exactly is Jigsaw and how can you download, install, and use it? In this article, we will answer these questions and show you how to create and run modular applications with Jigsaw.

What is Jigsaw and why is it important?

Jigsaw is a project that introduces modularity to Java

Jigsaw is an umbrella project that started in 2008 and was completed in 2017 with the release of Java 9. The main goal of Jigsaw was to introduce a standard module system to the Java language and its implementation in the JDK source code and the Java runtime. A module is a self-contained unit of code that declares its dependencies and exports its functionality to other modules. Modules can be compiled, packaged, deployed, and executed independently or together with other modules.

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Jigsaw has many benefits for developers and users

By using modules, developers can construct and maintain libraries and large applications more easily. Modules also improve the security and maintainability of Java SE Platform implementations in general, and the JDK in particular. For example, modules can encapsulate internal APIs that are not meant to be used by external code, preventing accidental or malicious access. Modules also enable improved application performance, as they allow for faster startup, smaller memory footprint, and better optimization by the compiler and the JVM. Moreover, modules enable the Java SE Platform and the JDK to scale down for use in small devices and dense cloud deployments, as they allow for customizing the runtime image to include only the modules that are needed for a specific application.

How to download and install Jigsaw

Jigsaw is part of JDK 9 and later versions

If you want to use Jigsaw, you need to have JDK 9 or later installed on your machine. Jigsaw is not a separate product or tool, but rather an integral part of the Java platform. Therefore, you cannot download or install Jigsaw separately from JDK 9 or later.

You can download JDK 9 or later from the official website or other sources

You can download JDK 9 or later from the official Oracle website or from other sources such as OpenJDK or AdoptOpenJDK. You can choose between different versions, editions, platforms, and formats depending on your needs and preferences. For example, you can download JDK 11 LTS (Long Term Support) for Windows x64 as an executable installer or as a ZIP archive.

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You can install JDK 9 or later by following the instructions for your operating system

You can install JDK 9 or later by following the instructions for your operating system. For example, if you are using Windows, you can run the executable installer or extract the ZIP archive to a location of your choice. You may also need to set some environment variables such as JAVA_HOME and PATH to point to your JDK installation directory.

How to use Jigsaw to create and run modular applications</h2 Jigsaw introduces a new concept of modules in Java

Before Jigsaw, Java applications consisted of classes and packages that were organized into JAR files and loaded by the classpath mechanism. With Jigsaw, Java applications can also consist of modules that are organized into modular JAR files and loaded by the modulepath mechanism. A module is a named, self-describing collection of code and data. A module has a name, a version, and a descriptor. The name is a unique identifier for the module, such as com.example.hello. The version is an optional string that indicates the release or build number of the module, such as 1.0.0. The descriptor is a file named module-info.java that declares the module's dependencies and exports. The dependencies are the other modules that this module requires to function, such as java.base or java.sql. The exports are the packages that this module makes available to other modules, such as com.example.hello.world.

You can create modules by using the module-info.java file and the javac command

To create a module, you need to write a module-info.java file and place it in the root directory of your source code. For example, if you want to create a module named com.example.hello that exports a package named com.example.hello.world, you can write the following module-info.java file:

module com.example.hello exports com.example.hello.world;

Then, you can compile your module by using the javac command with the -d option to specify the output directory. For example, you can run the following command to compile your module and place it in a directory named mods:

javac -d mods --module-source-path src $(find src -name "*.java")

This command will create a modular JAR file named com.example.hello.jar in the mods directory. You can also use other options of the javac command to specify additional information or options for your module, such as --module-version or --module-path.

You can run modules by using the java command with the --module-path and --module options

To run a module, you need to use the java command with the --module-path and --module options. The --module-path option specifies the directories or JAR files where the modules are located. The --module option specifies the name of the module to run and optionally the name of the main class to execute. For example, if you want to run a module named com.example.hello that has a main class named com.example.hello.world.HelloWorld, you can run the following command:

java --module-path mods --module com.example.hello/com.example.hello.world.HelloWorld

This command will load and execute the com.example.hello module and its dependencies from the mods directory and print "Hello World!" to the standard output. You can also use other options of the java command to specify additional information or options for your module, such as --add-modules or --add-exports.

Conclusion

Jigsaw is a powerful feature that makes Java more modular and scalable

Jigsaw is a project that introduces modularity to Java, allowing developers and users to create and run modular applications with improved performance, security, and scalability. Jigsaw is part of JDK 9 and later versions, and it is not a separate product or tool. Jigsaw introduces a new concept of modules in Java, which are self-contained units of code and data that declare their dependencies and exports.

You can easily download and install Jigsaw as part of JDK 9 or later

You can download and install Jigsaw as part of JDK 9 or later from the official Oracle website or from other sources such as OpenJDK or AdoptOpenJDK. You can choose between different versions, editions, platforms, and formats depending on your needs and preferences. You can install JDK 9 or later by following the instructions for your operating system.

You can use Jigsaw to create and run modular applications with improved performance and security

You can use Jigsaw to create modules by using the module-info.java file and the javac command. You can compile, package, deploy, and execute modules independently or together with other modules. You can run modules by using the java command with the --module-path and --module options. You can also use other options of the javac and java commands to specify additional information or options for your modules.

FAQs

What are some examples of modules in JDK 9 or later?

Some examples of modules in JDK 9 or later are java.base, which contains essential classes such as Object, String , and System, java.sql, which contains classes and interfaces for accessing relational databases, and java.desktop, which contains classes and interfaces for graphical user interfaces and multimedia.

How can I migrate my existing Java applications to use modules?

You can migrate your existing Java applications to use modules gradually and incrementally. You can start by running your applications on JDK 9 or later without any changes, using the classpath mechanism as before. Then, you can modularize your applications by creating module-info.java files for your own code and using the modulepath mechanism instead of the classpath. You can also use tools such as jdeps and jmod to analyze and package your modules.

What are some challenges or limitations of using Jigsaw?

Some challenges or limitations of using Jigsaw are that some features or APIs that were available in previous versions of Java may not be accessible or compatible with modules. For example, some internal APIs that were used by reflection or dynamic loading may not be exported by any module, or may require explicit permissions to access. Some libraries or frameworks that rely on these APIs may not work properly with modules, or may require additional configuration or adaptation. You may also encounter some compatibility issues or conflicts between different versions or implementations of modules.

Where can I find more information or resources about Jigsaw?

You can find more information or resources about Jigsaw from the following sources:

• The official website of the Jigsaw project:

• The official documentation of the Java Platform Module System:

• The official tutorial on creating and running modular applications:

• The official blog of the Java Platform Group:

• The official forum for discussing Jigsaw-related topics:

How can I provide feedback or report issues about Jigsaw?

You can provide feedback or report issues about Jigsaw by using the following channels:

• The official bug tracker of the OpenJDK project:

• The official mailing list of the Jigsaw project:

• The official Twitter account of the Java Platform Group:

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