VS code java creates duplicate classes in Java project with Gradle build

Environment

• Operating System: Linux 3.10.0-957.21.3.el7.x86_64 #1 SMP Fri Jun 14 02:54:29 EDT 2019 x86_64 x86_64 x86_64 GNU/Linux
• JDK version: 1.8.0_151
• Visual Studio Code version: 1.40.2
• Java extension version: 0.54.2
• Gradle version: 6.0.1

Steps To Reproduce

1. Create a default Java application with Gradle:

$ mkdir java-simple-app
$ cd java-simple-app/
$ gradle init

Select type of project to generate:
  1: basic
  2: application
  3: library
  4: Gradle plugin
Enter selection (default: basic) [1..4] 2

Select implementation language:
  1: C++
  2: Groovy
  3: Java
  4: Kotlin
  5: Swift
Enter selection (default: Java) [1..5]

Select build script DSL:
  1: Groovy
  2: Kotlin
Enter selection (default: Groovy) [1..2]

Select test framework:
  1: JUnit 4
  2: TestNG
  3: Spock
  4: JUnit Jupiter
Enter selection (default: JUnit 4) [1..4]

Project name (default: java-simple-app):
Source package (default: java.simple.app): org.my.app

> Task :init
Get more help with your project: https://docs.gradle.org/6.0.1/userguide/tutorial_java_projects.html

BUILD SUCCESSFUL in 37s
2 actionable tasks: 2 executed

1. Open the newly created project with vscode, wait for “Language Support for Java™ by Red Hat” extension to initialize project
2. Check the project folder tree:

java-simple-app/
|-- bin
|   |-- main
|   |   `-- org
|   |       `-- my
|   |           `-- app
|   |               `-- App.class
|   `-- test
|       `-- org
|           `-- my
|               `-- app
|                   `-- AppTest.class
|-- build
|   |-- classes
|   |   `-- java
|   |       |-- main
|   |       |   `-- org
|   |       |       `-- my
|   |       |           `-- app
|   |       |               `-- App.class
|   |       `-- test
|   |           `-- org
|   |               `-- my
|   |                   `-- app
|   |                       `-- AppTest.class
|   |-- generated
|   |   `-- sources
|   |       `-- annotationProcessor
|   |           `-- java
|   |               |-- main
|   |               `-- test
|   |-- reports
|   |   `-- tests
|   |       `-- test
|   |           |-- classes
|   |           |   `-- org.my.app.AppTest.html
|   |           |-- css
|   |           |   |-- base-style.css
|   |           |   `-- style.css
|   |           |-- index.html
|   |           |-- js
|   |           |   `-- report.js
|   |           `-- packages
|   |               `-- org.my.app.html
|   |-- test-results
|   |   `-- test
|   |       |-- binary
|   |       |   |-- output.bin
|   |       |   |-- output.bin.idx
|   |       |   `-- results.bin
|   |       `-- TEST-org.my.app.AppTest.xml
|   `-- tmp
|       |-- compileJava
|       `-- compileTestJava
|-- build.gradle
|-- gradle
|   `-- wrapper
|       |-- gradle-wrapper.jar
|       `-- gradle-wrapper.properties
|-- gradlew
|-- gradlew.bat
|-- settings.gradle
`-- src
    |-- main
    |   |-- java
    |   |   `-- org
    |   |       `-- my
    |   |           `-- app
    |   |               `-- App.java
    |   `-- resources
    `-- test
        |-- java
        |   `-- org
        |       `-- my
        |           `-- app
        |               `-- AppTest.java
        `-- resources

54 directories, 23 files

Question

The ‘build’ dir is from Gradle build task and its content looks similar to the ‘bin’ dir, which is generated by the extension. What is this ‘bin’ dir for?

[rubensa]

I ended with this configuration in my build.gradle so gradle build on “build/gradle” and eclipse on “build/eclipse”:

buildDir = "build/gradle"
apply plugin: 'java'
apply plugin: 'eclipse'
eclipse {
  classpath {
    defaultOutputDir = file('build/eclipse')
    file.whenMerged {
      entries.each { entry ->
        if (entry.kind == 'src' && entry.hasProperty('output')) {
          entry.output = entry.output.replace('bin/', "build/eclipse/")
        }
      }
    }
  }
}

[nqminhuit]

@snjeza perfect! This is what we needed, thank you very much!