maven how to use

Introduction

From WebIDE Full-stack on SAP Cloud Platform It is used when you create a new Java application project.

Knowledge of build tools in the Java area stopped at ʻant` This is a summary of some research on how to use it.

What is maven

Maven is a tool for building Java programs. Describe the program information in pom.xml, install the necessary modules, and It compiles, deploys modules, etc. with commands.

Installation

Install using homebrew.

brew install maven

Description of project definition (pom.xml)

The following definitions can be described under the project element.

element	Description
modelVersion	pom version
groupId	Project name (unique). It seems common to specify the root package name.
artifactId	Deliverable name. Used for names such as JARs and WARs to create
version	Project version
packaging	Deliverable format. Specify jar or war
name	Display name. Used when creating documents, etc.

Execution method

Delete build result

mvn clean

compile

mvn compile

Compile the source file Target source is under src / main / java /

Output the compiled class file to target / classes

test

mvn test

Test execution with a file that corresponds to the following pattern.

*/Test.java
**/*Test.java
**/*TestCase.java

Artifact creation

mvn package

Create an artifact in target

The file name is determined by artifactId, version and packaging of pom.xml.

fill in pom.xml

Main element description method and set value

Dependency resolution

<dependencies>
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>3.1.0</version>
        <scope>provided</scope>
    </dependency>
    <dependency>
    ~~~
    </dependency>
</dependencies>

element	Description
dependencies	Described in the element
dependency	Describe one module per element
groupId	Project name (unique). It seems common to specify the root package name.
artifactId	Deliverable name. Used for names such as JARs and WARs to create
version	Project version
scope	Condition specification that the library adds to the classpath

What can be set in scope

Setting value for scope	Timing of addition
compile	Default value. Add to classpath in all situations
provided	Add to classpath only at compile time
runtime	Add to classpath during test or normal run
test	Specify if required only during testing
system	If you want to explicitly add system libraries to your classpath. Note that it does not search the repository.

How to use Maven that I can't hear anymore