Tech-Notes

Maven

-project dependency management tool
-build and run project
-IDE independent

Standard Directory structure:

my-project->
  pom.xml  
  src->
      main->
          java
          resources
          webapp
      test->
        java
        resources  
  target      

src/main/java - java code
src/main/resorces - properties,config files
src/main/webapp - jsp,css,js,image etc
src/test - unit testing
target - compiled code by maven

pom.xml - project object model, it has

1. project meta data- projectName, version, filetype(JAR,WAR) etc
2. dependencies- like spring, hibernate etc
3. plugins- custom task to run: junit test reports
   ```xml

4.0.0 com.myApp myApp 1.0Final jar myApp UTF-8 1.8 1.8 jUnit jUnit 3.8.1 jUnit

**Maven Architypes**: collection of template/started files  
1. maven-architype-quickstart - normal spring core project files  
2. maven-architype-webapp     - have web.xml,index,jsp

Note: m2eclipse plugin should installed of maven support in eclipse 

### REPOSITORY:
**1. Local repository** : c:\Users\<user-dir>\.m2\repository  
**2. Central repository**: https://repo.maven.apache.org/maven2/
**3. Additional repository**: there are other 250 repositories in mvnrepository.com  
-if we need dependencies from other repositories except Central we need to add respository in pom.xml
```xml
<repositories>
  <repository>
    <id>atlassian</id> 
    <name>Atlassian Repository</name>
    <url>https://maven.atlassian.com/content/repositories/atlassian-public</url>
  </repository>
</repositories>
<dependencies>
  <dependency>
    <groupId>com.atlassian.mail</groupId>
    <artifactId>atlassian-mail</artifactId>
    <version>4.0.4</version>
  </dependency>
</dependencies>

4. Private repository: using
Archiva - archive.apache.org
Artifactory - www.jfrog.com
Nexus - www.sonatype.com

---

Maven commands

Create Java project

mvn archetype:generate 
-DgroupId=org.yourcompany.project 
-DartifactId=application

Create web project

mvn archetype:generate 
-DgroupId=org.yourcompany.project 
-DartifactId=application 
-DarchetypeArtifactId=maven-archetype-webapp

Create archetype from existing project mvn archetype:create-from-project
Other Commands:

1. clean — delete target directory
2. validate — checks, if the project is correct
3. compile — compile source code, classes stored in target/classes
4. test — run testspackage — take compiled code and package it in its distributable format, e.g. JAR, WAR
5. verify — run any checks to verify package is valid and meets quality criteria
6. install — install package into local repository
7. deploy — copies final package to the remote repository