Using Gradle with VS Code, build Java → run

Overview

As the title suggests, this article briefly summarizes the procedure of "Building and running Java using Gradle with VS Code".

• Please note that it is a prerequisite to use a Mac.

What is Gradle? https://ja.wikipedia.org/wiki/Gradle Gradle is a ** open source build automation system ** based on the Apache Ant and Apache Maven concepts, and is a Groovy-based ** domain-specific language instead of the ** XML format used by Apache Maven to declare project settings ( DSL) is adopted. Gradle uses a Directed Acyclic Graph (DAG) to determine the task launch order. Gradle is designed for multi-project builds, which can be very large, and supports incremental builds that intelligently determine which part of the build tree is up to date. Therefore, there is no need to rerun tasks that rely on the latest incremental build part. Early plugins focused primarily on Java, Groovy, and Scala development and deployment, but the roadmap shows workflows for other languages and projects.

procedure

1. Install VS Code

Install the main body of VS Code from the following https://code.visualstudio.com/

2. Install Java plugin

Search for "Java Extension Pack" in Preference-> Extensions and install it If you install this, all the following plugins will be included ・ Language Support for Java (TM) by Red Hat ・ Debugger for Java ・ Java Test Runner ・ Maven for Java -Java Dependency Viewer ・ Visual Studio IntelliCode

3. Java preparation for the terminal

Install Java and set $ JAVA_HOME as an environment variable https://www.java.com/ja/download/help/download_options.xml Add one of the following depending on the Java version used for the ~ / .bash_profile file

export JAVA_HOME=`/usr/libexec/java_home -v 10` #When you want to use java10
export JAVA_HOME=`/usr/libexec/java_home -v 9` #When you want to use java9
export JAVA_HOME=`/usr/libexec/java_home -v 1.8` #When you want to use java8

4. Install Gradle

Install with the following command

brew install gradle

5. Create a project

Create a folder for your Gradle project

mkdir project-name-dir
cd project-name-dir
gradle init --type java-application

6. Gradle operation check

Since the skeleton is prepared in the initial creation, execute the following to check the operation

gradle build #Build
gradle run #Run
gradle check #Verification
gradle clean #clean

7. VS Code settings

Add JAVA_HOME to VS Code settings as well Preference->Settings Search for "javahome" in, open the configuration file and add as below

"java.home": "<2.One of the paths added to the environment variable in>"

8. Task settings

Set tasks when running in VS Code For the settings, add the following to the file .vscode/task.json

{
    "version": "2.0.0",
    "tasks": [
        {
            "label": "build",
            "type": "shell",
            "command": "./gradlew build"
        },
        {
            "label": "run",
            "type": "shell",
            "command": "./gradlew run",
            "group": {
                "kind": "build",
                "isDefault": true
            }
        },
        {
            "label": "clean",
            "type": "shell",
            "command": "./gradlew clean"
        },
        {
            "label": "check",
            "type": "shell",
            "command": "./gradlew check"
        }
    ]
}

9. Perform the task

Execute the task You can execute the task defined in Terminal-> Run Task

Summary

Actually, I was planning to make a Java application and write an article, but since it is still being implemented, I tried using Gradle with VS Code for the first time, so I tried to organize the process, but it was relatively easy to introduce. It was. It's also a feature of VS Code, but it's lightweight and very comfortable.