maven-plugin-configuration

What this skill does

# Maven Plugin Configuration

Master Maven plugin configuration including core plugins, build plugins, reporting plugins, and custom plugin development.

## Overview

Maven plugins provide the actual functionality for building projects. Understanding how to configure plugins effectively is essential for customizing builds, optimizing performance, and ensuring code quality.

## Plugin Basics

### Plugin Structure

```xml
<build>
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.12.1</version>
            <configuration>
                <!-- Plugin-specific configuration -->
            </configuration>
            <executions>
                <execution>
                    <id>compile-java</id>
                    <phase>compile</phase>
                    <goals>
                        <goal>compile</goal>
                    </goals>
                </execution>
            </executions>
        </plugin>
    </plugins>
</build>
```

### Plugin Management

```xml
<build>
    <pluginManagement>
        <plugins>
            <!-- Define versions and shared config -->
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.12.1</version>
                <configuration>
                    <release>17</release>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>
    <plugins>
        <!-- Actually use plugin (inherits config) -->
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
        </plugin>
    </plugins>
</build>
```

## Core Build Plugins

### Compiler Plugin

```xml
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <version>3.12.1</version>
    <configuration>
        <release>17</release>
        <encoding>UTF-8</encoding>
        <showWarnings>true</showWarnings>
        <showDeprecation>true</showDeprecation>
        <compilerArgs>
            <arg>-Xlint:all</arg>
            <arg>-parameters</arg>
        </compilerArgs>
        <annotationProcessorPaths>
            <path>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>1.18.30</version>
            </path>
        </annotationProcessorPaths>
    </configuration>
</plugin>
```

### Resources Plugin

```xml
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-resources-plugin</artifactId>
    <version>3.3.1</version>
    <configuration>
        <encoding>UTF-8</encoding>
        <propertiesEncoding>UTF-8</propertiesEncoding>
        <nonFilteredFileExtensions>
            <nonFilteredFileExtension>pdf</nonFilteredFileExtension>
            <nonFilteredFileExtension>ico</nonFilteredFileExtension>
            <nonFilteredFileExtension>png</nonFilteredFileExtension>
            <nonFilteredFileExtension>jpg</nonFilteredFileExtension>
        </nonFilteredFileExtensions>
    </configuration>
</plugin>
```

### JAR Plugin

```xml
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-jar-plugin</artifactId>
    <version>3.3.0</version>
    <configuration>
        <archive>
            <manifest>
                <addClasspath>true</addClasspath>
                <mainClass>com.example.Main</mainClass>
                <addDefaultImplementationEntries>true</addDefaultImplementationEntries>
                <addDefaultSpecificationEntries>true</addDefaultSpecificationEntries>
            </manifest>
            <manifestEntries>
                <Build-Time>${maven.build.timestamp}</Build-Time>
                <Built-By>${user.name}</Built-By>
            </manifestEntries>
        </archive>
        <excludes>
            <exclude>**/logback-test.xml</exclude>
        </excludes>
    </configuration>
    <executions>
        <execution>
            <id>test-jar</id>
            <goals>
                <goal>test-jar</goal>
            </goals>
        </execution>
    </executions>
</plugin>
```

### Source Plugin

```xml
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-source-plugin</artifactId>
    <version>3.3.0</version>
    <executions>
        <execution>
            <id>attach-sources</id>
            <goals>
                <goal>jar-no-fork</goal>
            </goals>
        </execution>
    </executions>
</plugin>
```

### Javadoc Plugin

```xml
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-javadoc-plugin</artifactId>
    <version>3.6.3</version>
    <configuration>
        <doclint>none</doclint>
        <source>17</source>
        <quiet>true</quiet>
        <links>
            <link>https://docs.oracle.com/en/java/javase/17/docs/api/</link>
        </links>
    </configuration>
    <executions>
        <execution>
            <id>attach-javadocs</id>
            <goals>
                <goal>jar</goal>
            </goals>
        </execution>
    </executions>
</plugin>
```

## Testing Plugins

### Surefire Plugin (Unit Tests)

```xml
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-surefire-plugin</artifactId>
    <version>3.2.3</version>
    <configuration>
        <includes>
            <include>**/*Test.java</include>
            <include>**/*Tests.java</include>
            <include>**/Test*.java</include>
        </includes>
        <excludes>
            <exclude>**/*IT.java</exclude>
            <exclude>**/*IntegrationTest.java</exclude>
        </excludes>
        <argLine>-Xmx1024m -XX:+UseG1GC</argLine>
        <parallel>methods</parallel>
        <threadCount>4</threadCount>
        <forkCount>1C</forkCount>
        <reuseForks>true</reuseForks>
        <systemPropertyVariables>
            <spring.profiles.active>test</spring.profiles.active>
        </systemPropertyVariables>
        <environmentVariables>
            <TEST_ENV>true</TEST_ENV>
        </environmentVariables>
    </configuration>
</plugin>
```

### Failsafe Plugin (Integration Tests)

```xml
<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-failsafe-plugin</artifactId>
    <version>3.2.3</version>
    <configuration>
        <includes>
            <include>**/*IT.java</include>
            <include>**/*IntegrationTest.java</include>
        </includes>
        <skipAfterFailureCount>3</skipAfterFailureCount>
    </configuration>
    <executions>
        <execution>
            <goals>
                <goal>integration-test</goal>
                <goal>verify</goal>
            </goals>
        </execution>
    </executions>
</plugin>
```

### JaCoCo Plugin (Code Coverage)

```xml
<plugin>
    <groupId>org.jacoco</groupId>
    <artifactId>jacoco-maven-plugin</artifactId>
    <version>0.8.11</version>
    <executions>
        <execution>
            <id>prepare-agent</id>
            <goals>
                <goal>prepare-agent</goal>
            </goals>
        </execution>
        <execution>
            <id>report</id>
            <phase>test</phase>
            <goals>
                <goal>report</goal>
            </goals>
        </execution>
        <execution>
            <id>check</id>
            <goals>
                <goal>check</goal>
            </goals>
            <configuration>
                <rules>
                    <rule>
                        <element>BUNDLE</element>
                        <limits>
                            <limit>
                                <counter>LINE</counter>
                                <value>COVEREDRATIO</value>
                                <minimum>0.80</minimum>
                            </limit>
                            <limit>
                                <coun