hadoop-7

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Maven introduction.

Installation

  1. Download from Maven.
  2. Unzip and config path.

Maven configuration

  1. Change repository
    Edit ${M2_HOME}/conf/settings.xml

    • remote repo
      <mirror>
      <profile>
    • Local repo
      Default repo is ${USER_HOME}/.m2/repository. 
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      <localRepository>/path/to/local/repo</localRepository>

  2. Project control

    • Make pom.xml file in root dir of porject.

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      <?xml version="1.0">
      <project>
          <modelVersion>4.0.0</modelVersion>
          <groupId>nan.learnjava</groupId>
          <artifactId>testmaven</artifactId>
          <version>1.0.0</version>
      </project>

    • Make dirs nan/learnjava/testmaven.

    • Create java source file HelloMaven.java

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      package nan.learnjava.testmaven;
      public class HelloMaven {
          public static void main(String[] args) {
              System.out.println("Hello Maven!");
          }
      }

    • Compile and run

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      $> mvn clean compile    // compile
      $> mvn clean package    // package jar
      $> java -cp testmaven-1.0.0.jar nan.learnjava.testmaven.HelloMaven  // run

Private Maven Server

  1. NEXUS

    • Download nexus-xxx-bundel.zip from NEXUS.
    • Unzip and set path env.

    • Install service

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      $> nexus install  // install nexus service
      $> nexus start    // start service
      $> nexus restart  // restart service

    • Open in browser
      Web site: http://localhost:8081/nexus

  2. Config of nexus

    • Nexus repository path
      Edit file ${NEXUS_HOME}/conf/nexus.properties

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      applicaton-port=8081  #default port
      nexus-work=${bundleBasedir}/../sonatype-work/nexus  #default repository path

    • Log in
      username: admin
      password: admin123

    • Update index
      Repositories –> Central –> Configuration –> Download Remote Indexes –> true
      Central –> Repair Index
  3. Config of Maven
    • Copy ${M2_HOME}/conf/settings.xml to ${HOME}/.m2/
    • Edit settings.xml 
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      <!--localRepository-->
      <localRepository>D:/MyApps/mvn-local-repo</localRepository>
      <!--mirror-->
      <mirrors>
        <mirror>
          <id>nexus</id>
          <mirrorOf>*</mirrorOf>
          <name>nexus repo for maven.</name>
          <url>http://localhost:8081/nexus/content/groups/public</url>
        </mirror>
      </mirrors>
      <!--profile-->
      <profiles>
        <profile>
          <id>nexus</id>
          <repositories>
            <repository>
              <id>central</id>
              <name>central repos from nexus</name>
              <url>http://central</url>
              <releases><enabled>true</enabled></releases>
              <snapshots><enabled>true</enabled></snapshots>
            </repository>
          </repositories>
          <pluginRepositories>
            <pluginRepository>
              <id>central</id>
              <url>http://central</url>
              <releases>
                <enabled>true</enabled>
              </releases>
              <snapshots>
                <enabled>true</enabled>
              </snapshots>
            </pluginRepository>
          </pluginRepositories>
        </profile>
      </profiels>
      <!--active-->
      <activeProfiles>
        <activeProfile>nexus</activeProfile>
      </activeProfiles>

Archetype

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$> mvn archetype:generate -DarchetypeCatalog=internal

Maven for Eclipse

  1. Config
    Preference –> Maven –> User Setting –> Global Settings –> User Settings
  2. New Project
    New –> Project… –> Maven –> Maven Project –> Location –> Next –> … ..
    Input Group Id, Artifact Id, Version, Package
  3. Add dependencies
    Edit pom.xml file, add dependency. 
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    <dependency>
      <groupId>org.apache.hadoop</groupId>
      <artifactId>hadoop-client</artifactId>
      <version>2.7.4</version>
    </dependency>