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Showing content from https://github.com/mopemope/meghanada-emacs below:

mopemope/meghanada-emacs: A Better Java Development Environment for Emacs

Since we already have LSP, this product is no longer necessary, right?

This project is almost never used. This is because there is a useful product lsp-java. Please use it.

A Better Java Development Environment for Emacs

Meghanada is a new minor-mode (meghanada-mode) that aims at improving the editing experience for Java. It works by using a combination of an Emacs package and meghanada-server.

Features:

Easy install
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 and Lambda
Code completion with company-mode (company-meghanada)
Optimize import and sort
Find definitions and references using builtin xref
Run JUnit test (include test runner)
Diagnostic reporting with flycheck (flycheck-meghanada)
Show symbol's type info with el-doc
Full-featured text search

Meghanada is tested under Linux, Windows and macOS.

(Welcome contributions !)

Meghanada has been developed Emacs 25.1.1

meghanada-mode require meghanada-server and JDK (not JRE).

meghanada-server is The language server. The language server provides a simple interface between meghanada-mode and It is a protocol based on a simple S-expression. This server is developed in Java and supports Java version 8 or later.

The architecture between the server and the client is very similar to the language server protocol. The server retrieves and updates all information in the Java project at file save time and at compile time. If the autocompletion information is not displayed correctly, please try to fix the compilation error first.

Install meghanada from melpa.

An example is shown below.

(require 'meghanada)
(add-hook 'java-mode-hook
          (lambda ()
            ;; meghanada-mode on
            (meghanada-mode t)
            (flycheck-mode +1)
            (setq c-basic-offset 2)
            ;; use code format
            (add-hook 'before-save-hook 'meghanada-code-beautify-before-save)))
(cond
   ((eq system-type 'windows-nt)
    (setq meghanada-java-path (expand-file-name "bin/java.exe" (getenv "JAVA_HOME")))
    (setq meghanada-maven-path "mvn.cmd"))
   (t
    (setq meghanada-java-path "java")
    (setq meghanada-maven-path "mvn")))

The server will be automatically installed to ~/.emacs.d/meghanada/meghanada-x.x.jar.

If you open a java file and set meghanada-mode, a meghanada-server process starts automatically and connects to your Emacs.

The server will be automatically updated. To manually update bellows, type

M-x meghanada-update-server

Manual Server Installation

The server will be installed and updated automatically.

If you set it up manually, please follow the instructions below.

Download meghanada-setup.jar

A meghanada-setup.jar is a small program that automatically updates the server.

This can be downloaded from:

https://github.com/mopemope/meghanada-server/releases/download/v1.0.13/meghanada-setup-0.0.2.jar

Move the downloaded setup.jar to .emacs.d/meghanada/. Start Emacs and enable meghanada-mode.

Autocompletion is supported by company-mode. Supported autocompletions are as follows

Import Class
Class
Method
Field
Local Variable

If the completion candidates are not displayed correctly, try to fix the compilation error first. Auto-completion matching is optional. Try typing the following to find out more.

M-x customize-group RET meghanada and M-x customize-group RET company-meghanada.

Syntax checks, such as compile errors, are supported by flycheck. This includes -Xlint warnings.

meghanada-mode uses google-java-format by default for formatter.

It also support Eclipse formatter.

If you want to customize and use the Eclipse formatter please export the formatter settings from Eclipse to a file.

Then rename the file to meghanadaFormatter.xml and place it in the project root or subproject root. Meghanada will automatically load and import it.

If you want to use a system wide formatter, deploy the file to $HOME/.emacs.d/meghanada/meghanadaFormatter.xml.

meghanada-mode has no debugger yet. However, the external debugger is supported.

if you want to debug your code, execute meghanada-debug-xxxx function and then use realgud, etc.

# in Emacs now:
 M-x meghanada-debug-junit-class
 Please wait ...
 M-x realgud:jdb
 Run jdb (like this): jdb -attach 6006
 Set uncaught java.lang.Throwable
   Set deferred uncaught java.lang.Throwable
   Initializing jdb ...
   >
   VM Started: No frames on the current call stack

   main[1] stop at example.MyClass:100 // set breakpoint
   main[1] run

To customize other aspects of its behavior, type M-x customize-group RET meghanada and M-x customize-group RET company-meghanada.

See *meghanada-server-log* buffer. or (temporary-file-directory)meghanada_server_(user-uid).log, e.g. /tmp/meghanada_server_1000.log.

Please press C-g when emacs seems to hang.

Here is a list of available interactive commands.

Definitions and references can be found from the xref command.

Download and install meghanada-server jar.

Download and update meghanada-server jar. and restart the server process.

Start meghanada-server process and connect to the server.

meghanada-mode call this function by default. when open java file and set meghanada-mode.

Restart meghanada-server process and client process.

Kill meghanada-server process.

meghanada-client-direct-connect

Connect to other meghanada-server directly.

Connect to meghanada-server . Call automatically at the start meghanada-mode.

meghanada-client-disconnect

Disconnect from meghanada-server .

Send ping meghanada-server

Clear meghanada-server's project cache data.

meghanada-import-all (C-c C-r i)

Add import all unqualified classes.

meghanada-optimize-import (C-c C-r o)

Import all and remove unused import statement.

The format of the import statement will be in google-java-format.

meghanada-import-at-point

Add import statement from symbol at point.

meghanada-local-variable (C-c C-r r)

Introduce local variable. (need expression is end ;)

meghanada-compile-file (C-c C-c C-c)

Compile file (and related files).

Show project details.

meghanada-compile-project (C-c C-c c)

Compile project (full build and reindex).

meghanada-switch-testcase (C-M-,)

Switch test case or source.

Run main class.

Debug main class.

meghanada-search-everywhere

It does a full-text search based search (class, method, symbol (field)).

meghanada-search-everywhere-ex

It does a full-text search expert-mode (Enter a query for Lucene).

Here is a list of fields that can be used in the search.

package
class
method
symbol
usage
dc (method's or field's declaring class)

ex. Seach class name contains Search.

It can also use AND operator.

dc:*Optional* AND usage:get

Show type hierarchies and implements interfaces.

meghanada-run-junit-class (C-c C-c C-t)

Run JUnit test class.

meghanada-run-junit-test-case (C-c C-c t)

Run JUnit test case (select from imenu).

meghanada-debug-junit-class (C-c C-c C-t)

Debug JUnit test class.

meghanada-debug-junit-test-case (C-c C-c t)

Debug JUnit test case (select from imenu).

meghanada-run-task (C-c C-v t)

Run build tool task.

Format buffer code. The default formatter is google-java-format

Refactoring

Contributions are extremely welcome! Please push PR to dev branch.

GPL v3, See LICENSE file.

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