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Set up JDT.LS extension for Java-Kotlin interop
From fwcd/kotlin-language-server#334
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‎.gitignore‎

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node_modules
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target
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*.vsix
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.idea
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*.iml
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.DS_Store
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**/.DS_Store
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jars
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.vscode/settings.json

‎.vscode/launch.json‎

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// A launch configuration that compiles the extension and then opens it inside a new window
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// Use IntelliSense to learn about possible attributes.
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// Hover to view descriptions of existing attributes.
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// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
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{
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"version": "0.2.0",
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"configurations": [
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{
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"name": "Extension",
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"type": "extensionHost",
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"request": "launch",
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"runtimeExecutable": "${execPath}",
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"args": [
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"--extensionDevelopmentPath=${workspaceFolder}"
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],
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"outFiles": [
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"${workspaceFolder}/out/**/*.js"
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]
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}
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]
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}

‎.vscodeignore‎

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.vscode/**
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.idea/**
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*.iml
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javaConfig.json
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tsconfig.json
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org.javacs.kt.jdt.ls.extension
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build.sh
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.gitignore

‎README.md‎

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# VSCode Extension for Java + Kotlin
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A VSCode extension that enchances [vscode-java](https://github.com/redhat-developer/vscode-java) and [vscode-kotlin](https://github.com/fwcd/vscode-kotlin) with java + kotlin interoperability. This uses a JDT LS extension with a custom project importer to allow Java code to have access to Kotlin code.
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**Disclaimer**: This is very experimental, but it seems to work for small maven and gradle projects at least.
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## Setup (for now)
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For now, to set this up, you need to run the `build.sh` script in this directory to package the JDT LS extension. Afterwards, you should run `npm install` to install the extension dependencies.
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To debug, you can use F5 on VSCode, as with any other extension. To package the extension you can use `vsce package`.

‎build.sh‎

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#!/bin/bash
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rm -fr jars
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mkdir -p jars
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cd jdt-ls-extension
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mvn clean package
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cp org.javacs.kt.jdt.ls.extension/target/org.javacs.kt.jdt.ls.extension-1.0.0-SNAPSHOT.jar ../jars/jdt-ls-extension.jar

‎javaConfig.json‎

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{
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"projects": [
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"./jdt-ls-extension/org.javacs.kt.jdt.ls.extension"
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],
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"targetPlatform": "./jdt-ls-extension/target.target"
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}

‎jdt-ls-extension/org.javacs.kt.jdt.ls.extension/META-INF/MANIFEST.MF‎

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Manifest-Version: 1.0
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Bundle-ManifestVersion: 2
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Bundle-Name: org.javacs.kt.jdt.ls.extension
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Bundle-SymbolicName: org.javacs.kt.jdt.ls.extension;singleton:=true
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Bundle-Version: 1.0.0.qualifier
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Bundle-Vendor: VMware, Inc.
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Bundle-RequiredExecutionEnvironment: JavaSE-1.8
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Require-Bundle: org.eclipse.jdt.ls.core,
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org.eclipse.core.runtime,
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org.eclipse.jdt.core,
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org.eclipse.core.resources,
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org.eclipse.m2e.core;resolution:=optional,
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org.eclipse.m2e.jdt;resolution:=optional,
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org.eclipse.m2e.maven.runtime;resolution:=optional,
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org.eclipse.lsp4j,
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org.eclipse.lsp4j.jsonrpc

‎jdt-ls-extension/org.javacs.kt.jdt.ls.extension/build.properties‎

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source.. = src/
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output.. = bin/
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bin.includes = META-INF/,\
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.,\
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plugin.xml

‎jdt-ls-extension/org.javacs.kt.jdt.ls.extension/plugin.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<?eclipse version="3.4"?>
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<plugin>
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<extension
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id="importers"
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point="org.eclipse.jdt.ls.core.importers">
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<importer
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id = "kotlinGradleImporter"
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order = "125"
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class = "org.javacs.kt.jdt.ls.extension.KotlinGradleImporter"/>
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<importer
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id = "kotlinMavenImporter"
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order = "150"
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class = "org.javacs.kt.jdt.ls.extension.KotlinMavenImporter"/>
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</extension>
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</plugin>
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‎jdt-ls-extension/org.javacs.kt.jdt.ls.extension/pom.xml‎

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<project xmlns="https://maven.apache.org/POM/4.0.0"
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xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="https://maven.apache.org/POM/4.0.0
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https://maven.apache.org/maven-v4_0_0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<packaging>eclipse-plugin</packaging>
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<groupId>org.javacs.kt</groupId>
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<artifactId>org.javacs.kt.jdt.ls.extension</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<name>org.javacs.kt.jdt.ls.extension</name>
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<parent>
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<groupId>org.javacs.kt</groupId>
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<artifactId>jdt-ls-extension-parent</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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</project>

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