project tag

Örnek

groupId, artifactId, version belirtilir. Şöyle yaparız

<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>wiremock-example</artifactId>
  <version>1.0-SNAPSHOT</version>

  <properties>
    <java.version>11</java.version>
    <spring-boot.version>2.6.3</spring-boot.version>
  </properties>

  <dependencies>
    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>
</project>

POM İçinde dependencyManagement Tag

Giriş

Bu tag ister BOM içinde, ister kendi POM projemiz içinde olsun kullanılmasını istediğimiz kütüphane sürümlerini belirtir.

BOM Import Etmek

<type>pom</type> yapılır. <scope>import</scope> belirtilir

Örnek

Şöyle yaparız

<project ...>
  <modelVersion>4.0.0</modelVersion>
  <groupId>baeldung</groupId>
  <artifactId>Test</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>pom</packaging>
  <name>Test</name>
    
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>baeldung</groupId>
        <artifactId>Baeldung-BOM</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
</project>

Conflicting Transitive Dependency

Conflicting Transitive Dependency yazısına taşıdım

Dependency Scopes

1. compile

Kendi kodumuz görebilir Açıklaması şöyle

Leaks into consumers' compile time?  yes
Leaks into consumers' runtime? 	     yes
Included in Artifact?		     yes

2. runtime

Dependency paketlerini kendi kodumuz göremez Dolayısıyla kullanmayız. Açıklaması şöyle

Leaks into consumers' compile time?  no
Leaks into consumers' runtime? 	     yes
Included in Artifact?		     yes

Örnek

Şöyle yaparız

<dependency>
    <groupId>mysql</groupId>
    <artifactId>mysql-connector-java</artifactId>
    <version>8.0.28</version>
    <scope>runtime</scope>
</dependency>

3. test

Kendi kodumuz görebilir Açıklaması şöyle

Leaks into consumers' compile time?  no
Leaks into consumers' runtime? 	     no
Included in Artifact?		     no

4. provided

Açıklaması şöyle

- Dependencies with this scope are required for compiling and running the application, but they are expected to be provided by the runtime environment.

- They are available on the classpath during the compile and test phases but are not packaged with the application.

5. system

Açıklaması şöyle

- Dependencies with this scope are similar to compile dependencies but are referenced using an explicit path on the local system.

- They are not available in any Maven repository.

Örnek

Şöyle yaparız

<scope>system</scope>
<systemPath>/path/to/dependency.jar</systemPath>

gradle implementation vs maven

Açıklaması şöyle

Q : What is the maven equivalent of implementation dependencies in gradle?

A : 

- Such dependency should have scope=compile when declared in your lib. This way it will be available during compilation of the lib.

- But it should have scope=runtime when declared in dependencyManagement section of other modules that depend on your lib. This way it won't be present in the classpath when compiling other modules.

hibernate-enhance plugin

Giriş

Native derleme için gerekir. Graalvm ile birlikte kullanılır

Örnek

Şöyle yaparız. 

<plugin>
  <groupId>org.hibernate.orm.tooling</groupId>
  <artifactId>hibernate-enhance-maven-plugin</artifactId>
  <version>${hibernate.version}</version>
  <executions>
    <execution>
      <id>enhance</id>
      <goals>
        <goal>enhance</goal>
      </goals>
      <configuration>
        <enableLazyInitialization>true</enableLazyInitialization>
	<enableDirtyTracking>true</enableDirtyTracking>
	<enableAssociationManagement>true</enableAssociationManagement>
      </configuration>
    </execution>
  </executions>
</plugin>

Custom Archetype Yaratma

Giriş

Bir örnek burada

Örnek

pom.xml şöyledir. Burada önemli olan şey artifactId ile belirtilen isim

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 
  http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>fr.simplex-software.archetypes</groupId>
  <artifactId>jakartaee10-basic-archetype</artifactId>
  <version>1.0-SNAPSHOT</version>
  <name>Basic Java EE 10 project archetype</name>
  ...
  <packaging>maven-archetype</packaging>
  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
  </properties>
  <build>
    <extensions>
      <extension>
        <groupId>org.apache.maven.archetype</groupId>
        <artifactId>archetype-packaging</artifactId>
        <version>3.1.1</version>
      </extension>
    </extensions>
  </build>
</project>

Böylece şöyle kullanırız

mvn -B archetype:generate \
  -DarchetypeGroupId=fr.simplex-software.archetypes \
  -DarchetypeArtifactId=jakartaee10-basic-archetype \
  -DarchetypeVersion=1.0-SNAPSHOT \
  -DgroupId=com.exemple \
  -DartifactId=test

Kod üretiminde kullanılacak her şey şu dosyada tanımlı. Bu dosyada tanımlı her şeyin önüne src/main/resources/archetype-resources/ eklenir.

src/main/resources/META-INF/maven/archetype-metadata.xml

XML şöyle ise 

<archetype-descriptor...>
  <fileSets>
    <fileSet filtered="true" packaged="false" encoding="UTF-8">
      <directory>src/main/java</directory>
      <includes>
        <include>**/*.java</include>
      </includes>
    </fileSet>
    ...
  </fileSets>
</archetype-descriptor>

Java kodları şu dizinde

src/main/resources/archetype-resources/src/main/java

Örneğin test kodları şurada

src/main/resources/archetype-resources/src/test/java/

Diğer dosyalar şurada

src/main/resources/archetype-resources/src/main/resources/META-INF
src/main/resources/archetype-resources/src/main/webapp/WEB-INF/

Kodlarda Velocity placeholder kullanılıyor. Şöyle yaparız. Burada  $package bir placeholder

package $package;

import jakarta.ws.rs.*;
import jakarta.ws.rs.core.*;
import jakarta.inject.*;

import org.eclipse.microprofile.config.inject.*;

@Path("myresource")
public class MyResource {
  @Inject
  @ConfigProperty(name = "message")
  private String message;

  @GET
  @Produces(MediaType.TEXT_PLAIN)
  public String getIt() {
    return message;
  }
}

Custom Archetypes - Maven İle Hazır Gelmeyenler

Giriş

1. DarchetypeGroupId kullanılır. 

2. İsteğe bağlı olarak -DarchetypeArtifactId ve -DarchetypeVersion belirtilebilir. 

3. GAV (GroupID, ArtifactID, Version) örneğim com.example:test:1.0-SNAPSHOT mecburen belirtiliyor

Örnek

Şöyle yaparız

mvn archetype:generate \
   -DarchetypeGroupId=org.apache.flink \
   -DarchetypeArtifactId=flink-quickstart-java \
   -DarchetypeVersion=1.13.0 \
   -DgroupId=com.example \
   -DartifactId=my-flink-project \
   -Dversion=0.1 \
   -Dpackage=com.example \
   -DinteractiveMode=false

Açıklaması şöyle

This command creates a new Maven project with the Flink dependencies and a sample Flink job.

Örnek

Şöyle yaparız

mvn archetype:generate \
   -DarchetypeGroupId=com.hazelcast.simulator \
   -DarchetypeArtifactId=archetype \
   -DarchetypeVersion=0.11-SNAPSHOT

Örnek 

Şöyle yaparız. Burada -DarchetypeArtifactId ve -DarchetypeVersion da belirtilmiş

mvn archetype:generate -DarchetypeGroupId=io.confluent.maven
 -DarchetypeArtifactId=kafka-connect-quickstart -DarchetypeVersion=0.10.0.0 \
-Dpackage=com.opencredo.examples \
-DgroupId=com.opencredo.examples \
-DartifactId=my-source-connector \
-Dversion=1.0-SNAPSHOT

pluginRepositories tag

Örnek

Şöyle yaparız

<project ...>
  <parent>
    ...
  </parent>
  <properties>
    ...
  </properties>
  <dependencies>
    ...
  </dependencies>
  <build>
    <plugins>
      ...
    </plugins>
  </build>

  <repositories>
    ...
  </repositories>

  <pluginRepositories>
    <pluginRepository>
      <id>spring-libs-milestone</id>
      <url>https://repo.spring.io/libs-milestone</url>
    </pluginRepository>
  </pluginRepositories>
</project>