Maven

mavn force update from remote

#-U means force update of dependencies
mvn clean install -U

maven with JDK

• maven 3.2 requires jdk 1.6 or above, maven 3.0/3.1 require jdk 1.5 or above

oschina maven repo

• http://maven.oschina.net/help.html - config maven repo use oschina maven repo

configure maven

• http://maven.apache.org/guides/mini/guide-configuring-maven.html
• http://maven.apache.org/ref/3.2.3/maven-settings/settings.html
• http://maven.apache.org/settings.html
• http://maven.apache.org/components/ref/ - all version reference

create a simple java project

• check your ~/m2/settings.xml
• create project with archetype plugin

mvn archetype:create -DgroupId=com.lokvin -DartifactId=baseman -DarchetypeArtifactId=maven-archetype-quickstart
mvn archetype:generate -DgroupId=me.lokvin.example -DartifactId=SpringExample -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

• create a new github repository

touch README.md
git init
git add .
git commit -m "first commit"
git remote add origin https://github.com/xxxx/baseman.git
git push -u origin master

• make it to eclipse project

>cd baseman
>mvn eclipse:eclipse

mvn archetype

• http://maven.apache.org/archetype/maven-archetype-plugin/usage.html

mvn download source code

mvn dependency:sources

mvn dependency tree

mvn dependency:tree

settings.xml

<settings xmlns="http://maven.apache.org/SETTINGS/1.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0
http://maven.apache.org/xsd/settings-1.0.0.xsd">
      <localRepository/>
      <interactiveMode/>
      <usePluginRegistry/>
      <offline/>
      <pluginGroups/>
      <servers/>
      <mirrors/>
      <proxies/>
      <profiles/>
      <activeProfiles/>
</settings>

Element Name	Description
localRepository	Maven 用来存储 plugins 和 dependencies 的本地目录。 默认为 ~/.m2/repository. 可以通过这个属性来指定别的目录
interactiveMode	Default is true. Maven interact with user for input
offline	Default is false. When set true, maven operate in offline mode
servers	Maven can interact with a variety of servers, such as: SVN, build server, remote repository server. This element specify security credentials. such as username, passwd which connect to these server
mirrors	specify alternative locations for your respositories
proxies	http proxy information connect to internet
profiles	profiles allow to group certain configuration elements, such as: repositories and pluginRepositories
activeProfile	activeProfile allow you specify default profile to be active for maven use

maven dependency management

Enterprise Maven repository architecture

Maven Dependency Management

opensource repository managers

• http://www.sonatype.com/nexus/product-overview
• http://archiva.apache.org/index.cgi
• https://www.jfrog.com/open-source/

maven create spring example project

• http://projects.spring.io/spring-framework/

• create empty project

mvn archetype:generate -DgroupId=me.lokvin.example -DartifactId=SpringExample -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

maven dependency scope

• https://maven.apache.org/guides/introduction/introduction-to-dependency-mechanism.html

• compile

This is the default scope, used if none is specified. Compile dependencies are available in all classpaths of a project. Furthermore, those dependencies are propagated to dependent projects.

• provided

This is much like compile, but indicates you expect the JDK or a container to provide the dependency at runtime. For example, when building a web application for the Java Enterprise Edition, you would set the dependency on the Servlet API and related Java EE APIs to scope provided because the web container provides those classes. This scope is only available on the compilation and test classpath, and is not transitive.

• runtime

This scope indicates that the dependency is not required for compilation, but is for execution. It is in the runtime and test classpaths, but not the compile classpath.

• test

This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases.

• system

This scope is similar to provided except that you have to provide the JAR which contains it explicitly. The artifact is always available and is not looked up in a repository.

• import (only available in Maven 2.0.9 or later)

This scope is only used on a dependency of type pom in the <dependencyManagement> section. It indicates that the specified POM should be replaced with the dependencies in that POM's <dependencyManagement> section. Since they are replaced, dependencies with a scope of import do not actually participate in limiting the transitivity of a dependency.