Bach.java 11.0-ea - Java Shell Builder

Use Java source to build your modular Java project.

Everything's written in standard .java files. No additional .xml, .yml, or .z... configuration files required. Bach.java infers many projects properties directly from the module-info.java compilation units. On top of that, Bach.java supports an installation-free on-the-fly run mode via:

jshell https://bit.ly/bach-build

Declare your own custom build program in src/.bach/Build.java and override various project properties using a builder API. Your IDE of choice offers available property setters by default.

class Build {
  public static void main(String... args) {
    new Bach().build(project -> project.version("1-ea")).assertSuccessful();
  }
}

Bach.java writes a build summary file in markdown format stores it in .bach/summary.md. It contains amongst other information the structure of the project and the system properties at invocation-time. The calls to JDK Foundation Tools with their arguments are also recorded:

	Thread	Duration	Caption
+	1		Build project demo 1-ea
	1	0	Create directories .bach
+	1		Print version of various foundation tools
	16	21	Run javac with 1 argument(s)
	15	23	Run jar with 1 argument(s)
	1	52	Run javadoc with 1 argument(s)
=	1	56	Print version of various foundation tools
	1	37	Resolve missing modules
			...
+	1		Launch all tests
			...
=	1	105	Build project demo 1-ea done.
Legend

• A row starting with + denotes the start of a task container.
• A blank row start ( ) is a normal task execution. Its caption is emphasized.
• A row starting with X marks an erroneous task execution.
• A row starting with = marks the end (sum) of a task container.
• The Thread column shows the thread identifier, with 1 denoting main thread.
• Duration is measured in milliseconds.

Example Projects

After cloning or downloading an example project, open a shell in the base directory of the project and call jshell https://bit.ly/bach-build.

That's all. Have fun!

• 📋 bach-template - Minimal Java project template

  A minimal modular Java project that contains a single and almost empty module-info.java file.

• ☁ bach-air - Java project with inter-module and in-module tests

  A modular Java project that show-cases inter-module (black-box) and in-module (white-box) testing. It also provides IntelliJ IDEA configuration files with shared test run launchers for both scenarios.

All example projects usually contain a .github/workflows/build.yml configuration file that builds the project using Bach.java on push events.

Build your project with Bach.java 11.0-ea on-the-fly

Use https://bit.ly/bach-build as <load-file> argument for jshell:

• jshell https://bit.ly/bach-build

The shortened URL expands to:

• jshell https://github.com/sormuras/bach/raw/master/src/bach/build.jsh

Set system property debug to "" (an empty string) or true to enable verbose output of the build run. The prefix -R is required when running Bach.java on-the-fly via jshell as it launches a remote runtime system per default.

• jshell -R-Debug https://bit.ly/bach-build

Build with Bach.java 2.1 on-the-fly

Bach.java 2.x was showcased in a lightning talk at FOSDEM2020. To build your project with this effectively deprecated version of Bach.java, invoke:

• jshell https://github.com/sormuras/bach/raw/2.1/src/bach/build.jsh

Common Conventions

• Main Class Convention
  A compilation unit named Main.java and located in a package with the same name as its module is considered to be the main class of that module. For example: a module com.greetings (with a module-info.java in src/com.greetings) provides the main class com.greetings.Main if there's a src/com.greetings/com/greetings/Main.java compilation unit.

• Main Module Convention
  If the project declares exactly a single module with a main class, that module is considered to be the project main module.

• Test Module ToolProvider Convention
  If a test module provides a java.util.spi.ToolProvider implementation named like that (or another) test module, it is run. For example: the TestProvider class is instantiated and run if module test.modules declares provides java.util.spi.ToolProvider with test.modules.TestProvider; and TestProvider#getName() returns test(test.modules).

• Mend Missing Modules Convention
  If a project declares dependence to members of a set of well-known "API" modules, that for themselves require more modules to be present at runtime, those additional modules are implicitly declared as a dependence. For example: a project module declares requires org.junit.jupiter.api; then org.junit.jupiter.engine is added to the set of required modules.

Motivation

No need to be a maven to be able to use a build tool - forax/pro

Ranging from JDK Foundation Tools, over shell scripts and Apache Ant to multi-language, multi-purpose build tools...

...Bach.java's target is between platform-specific shell scripts and Apache Ant. Bach.java delegates

install-jdk.sh

install-jdk.sh main purpose is to install the latest-and-greatest available OpenJDK release from jdk.java.net. Find a Travis CI matrix configuration at sormuras.github.io/.travis.yml.

Options of install-jdk.sh

-h|--help                 Displays this help
-d|--dry-run              Activates dry-run mode
-s|--silent               Displays no output
-e|--emit-java-home       Print value of "JAVA_HOME" to stdout (ignores silent mode)
-v|--verbose              Displays verbose output

-f|--feature 9|11|...|ea  JDK feature release number, defaults to "ea"
-o|--os linux-x64|osx-x64 Operating system identifier
-u|--url "https://..."    Use custom JDK archive (provided as .tar.gz file)
-w|--workspace PATH       Working directory defaults to user's ${HOME}
-t|--target PATH          Target directory, defaults to first real component of the tarball
-c|--cacerts              Link system CA certificates (currently only Debian/Ubuntu is supported)

How to set JAVA_HOME with install-jdk.sh

• Source install-jdk.sh into current shell to install latest OpenJDK and let it update JAVA_HOME and PATH environment variables:

  • source ./install-jdk.sh Caveat: if an error happens during script execution the calling shell will terminate

• Provide target directory path to use as JAVA_HOME:

  • JAVA_HOME=~/jdk && ./install-jdk.sh --target $JAVA_HOME && PATH=$JAVA_HOME/bin:$PATH

• Run install-jdk.sh in a sub-shell to install latest OpenJDK and emit the installation path to stdout:

  • JAVA_HOME=$(./install-jdk.sh --silent --emit-java-home)
  • JAVA_HOME=$(./install-jdk.sh --emit-java-home | tail --lines 1)

be free - have fun