helpermethod/mvnd

Maven Daemon

mvnd: Maven Daemon

The mvnd project aims to provide a daemon infrastructure for maven based builds. It borrows techniques from Gradle and Takari to provide a simple and efficient system.

Install mvnd

If you are on Linux or Mac, you can use the following shell commands. On Windows, you can perform the steps manually.

cd ~/bin # (1)
os=$(uname | tr '[:upper:]' '[:lower:]') # (2)
curl -L https://github.com/mvndaemon/mvnd/releases/latest/download/mvnd-${os}-amd64 -o mvnd # (3)
chmod +x mvnd # (4)
mvnd --install # (5)

1. Change to ~/bin or any other location already included in PATH; otherwise, you’ll need to add mvnd to PATH manually

2. Detect the name of the current operating system and turn it to lower case

3. Download the latest mvnd executable for the given OS from mvnd releases page; store the executable as mvnd (or mvnd.exe on Windows)

4. Make it executable (not required on Windows)

5. Run mvnd --install to download and install the server part. This will:

   • Download mvnd-dist.zip

   • Unpack it to ~/.m2/mvnd/<version>

   • Create ~/.m2/mvnd.properties

     If your are on Windows and see a message that VCRUNTIME140.dll was not found, you need to install vc_redist.x64.exe from https://support.microsoft.com/en-us/help/2977003/the-latest-supported-visual-c-downloads. See oracle/graal#1762 for more information.

Optionally, you can open ~/.m2/mvnd.properties and set the java.home property in case you do not want to bother with setting JAVA_HOME environment variable.

+ Now you can test whether mvnd works:

$ mvnd --version
Maven Daemon 0.0.0 (native)
Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)
Maven home: /home/ppalaga/orgs/mvnd/mvnd/daemon/target/maven-distro
Java version: 11.0.1, vendor: AdoptOpenJDK, runtime: /home/data/jvm/adopt-openjdk/jdk-11.0.1+13
Default locale: en_IE, platform encoding: UTF-8
OS name: "linux", version: "5.6.13-200.fc31.x86_64", arch: "amd64", family: "unix"

Usage

mvnd is designed to accept the same command line options like stock mvn (plus some extras - see below), e.g.:

mvnd clean install

mvnd specific options

--install installs the server part

--status lists running daemons

--stop kills all running daemons

Build mvnd from source

Prerequisites:

• git

• Maven

• Download and unpack GraalVM CE from GitHub

• Set JAVA_HOME to where you unpacked GraalVM in the previous step. Check that java -version output is as expected:

  $ $JAVA_HOME/bin/java -version
  openjdk version "11.0.7" 2020-04-14
  OpenJDK Runtime Environment GraalVM CE 20.1.0 (build 11.0.7+10-jvmci-20.1-b02)
  OpenJDK 64-Bit Server VM GraalVM CE 20.1.0 (build 11.0.7+10-jvmci-20.1-b02, mixed mode, sharing)

• Install the native-image tool:

  $ $JAVA_HOME/bin/gu install native-image

• native-image may require additional software to be installed depending on your platform - see the native-image documentation.

Build mvnd

$ git clone https://github.com/mvndaemon/mvnd.git
$ cd mvnd
$ mvn clean verify -Pnative
...
$ cd client
$ file target/mvnd
target/mvnd: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, BuildID[sha1]=93a554f3807550a13c986d2af9a311ef299bdc5a, for GNU/Linux 3.2.0, with debug_info, not stripped
$ ls -lh target/mvnd
-rwxrwxr-x. 1 ppalaga ppalaga 25M Jun  2 13:23 target/mvnd

This project is still in prototype mode, so feedback is most welcomed!