doomemacs/modules/lang/java

lang/java

• Description
  • Module Flags
• Prerequisites
  • OpenJDK 11
    • Ubuntu
    • Fedora
  • Oracle JDK 11
    • Ubuntu
    • Fedora
• Features
  • +lsp features
  • +meghanada features
• Configuration

Description

This module adds java support to Doom Emacs, including android-mode and groovy-mode.

Module Flags

• +lsp Enables integration for the eclipse.jdt.ls LSP server.
• +meghanada Enables the meghanada-mode

The +lsp and +meghanada packages are mutually exclusive and do not work together. At the time of writing the +meghanada is already configured whereas +lsp needs to manual configuring.

Prerequisites

This module requires the Java SDK.

OpenJDK 11

Ubuntu

sudo apt-get install openjdk-11-jdk-headless

Fedora

sudo dnf install java-11-openjdk

Oracle JDK 11

Ubuntu

sudo add-apt-repository ppa:linuxuprising/java
sudo apt update
sudo apt install oracle-java11-installer
sudo apt install oracle-java11-set-default

Fedora

curl -O https://download.java.net/java/GA/jdk11/9/GPL/openjdk-11.0.2_linux-x64_bin.tar.gz
tar zxvf openjdk-11.0.2_linux-x64_bin.tar.gz
sudo mv jdk-11.0.2/ /usr/local/

Open /etc/profile.d/jdk11.sh as root and add

export JAVA_HOME=/usr/local/jdk-11.0.2
export PATH=$PATH:$JAVA_HOME/bin

Save the file and source the file

source /etc/profile.d/jdk11.sh
java -version

Features

+lsp features

According to https://github.com/emacs-lsp/lsp-java it adds

• As you type reporting of parsing and compilation errors (via flycheck/lsp-ui)
• Code completion - using company-lsp or builtin complete-at-point
• Javadoc hovers - using lsp-ui
• Code actions - using lsp-ui
• Code outline - using builtin imenu
• Code navigation - using builtin xref
• Code lens (references/implementations) - using builtin xref
• Highlights
• Code formatting
• Maven pom.xml project support
• Limited Gradle support
• Visual debugger - dap-mode
• Test runner - dap-mode
• Project explorer integration - treemacs
• Integration with Spring Initializr

+meghanada features

According to https://github.com/mopemope/meghanada-emacs/ it adds

• Auto-update server module
• Gradle and Maven and Eclipse project support
• No need build tool's plugin
• Run build tool task
• Compile your project
• Syntax check and analyze java source (flycheck-meghanada)
• Support Generic Types
• Code completion with company-mode (company-meghanada)
• Optimize import and sort
• Jump declaration
• Run JUnit test (include test runner)
• Diagnostic reporting with flycheck (flycheck-meghanada)
• Show symbol's type info with el-doc
• Search references
• Full-featured text search

TODO Configuration