Can not generate class-path from Manifest

<?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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>com.ipsis.pacha</groupId>
	<artifactId>Pacha</artifactId>
	<packaging>pom</packaging>
	<version>1.0-SNAPSHOT</version>
	<name>PACHA</name>
	
	<build>
		<plugins>
			<plugin>
				<!-- Tache permettant d'afficher le classpath utilisé lors de l'execution de maven. -->
				<artifactId>maven-antrun-plugin</artifactId>
				<executions>
					<execution>
						<id>print-maven-runtime-classpath</id>
						<phase>compile</phase>
						<configuration>
							<tasks>
								<property name="runtime-classpath"
									refid="maven.runtime.classpath" />
								<echo
									message="maven.runtime.classpath=${runtime-classpath}" />
							</tasks>
						</configuration>
						<goals>
							<goal>run</goal>
						</goals>
					</execution>
					<execution>
						<id>print-maven-test-classpath</id>
						<phase>test-compile</phase>
						<configuration>
							<tasks>
								<property name="test-classpath"
									refid="maven.test.classpath" />
								<echo
									message="maven.test.classpath=${test-classpath}" />
							</tasks>
						</configuration>
						<goals>
							<goal>run</goal>
						</goals>
					</execution>
				</executions>
			</plugin>

			<plugin>
				<!-- Version du compilateur et de la JVM cible pour l'execution de l'application -->
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<!-- On reste en 1.6. -->
					<source>1.6</source>
					<target>1.6</target>
					<meminitial>512m</meminitial>
					<maxmem>1024m</maxmem>
					<optimize>true</optimize>
					<verbose>true</verbose>
					<fork>true</fork>
					<executable>${JAVA_HOME}\bin\javac.exe</executable>
					<compilerVersion>1.6</compilerVersion>
				</configuration>
				<dependencies />
			</plugin>

			<!--  Deploiement -->
			<plugin>
				<inherited>true</inherited>
				<artifactId>maven-deploy-plugin</artifactId>
				<configuration>
					<updateReleaseInfo>true</updateReleaseInfo>
				</configuration>
			</plugin>

			<!-- Permet de déployer aussitôt la version lors de sa création. -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-release-plugin</artifactId>
				<configuration>
					<goals>deploy</goals>
				</configuration>
			</plugin>

			<!-- Plugin pour les tests unitaires -->
			<plugin>
				<artifactId>maven-surefire-plugin</artifactId>
			</plugin>

			<plugin>
				<!-- Plugin de generation des fichiers de configuration pour Eclipse -->
				<artifactId>maven-eclipse-plugin</artifactId>
				<configuration>
					<wtpversion>2.0</wtpversion>
					<!-- Configuration de repertoire de compilation d'Eclipse -->
					<buildOutputDirectory>
						/classes
					</buildOutputDirectory>
					<downloadSources>false</downloadSources>

					<!-- Ajout des librairies Eclipse -->
					<classpathContainers>
						<!-- Ajout du JRE par défaut Eclipse -->
						<classpathContainer>
							org.eclipse.jdt.launching.JRE_CONTAINER
						</classpathContainer>
					</classpathContainers>
				</configuration>
			</plugin>

			<!-- Construction du site -->
			<plugin>
				<artifactId>maven-site-plugin</artifactId>
				<configuration>
					<locales>fr</locales>
					<inputEncoding>ISO-8859-1</inputEncoding>
					<outputEncoding>ISO-8859-1</outputEncoding>
				</configuration>
			</plugin>

			<!-- Creation d'un jar unique -->
			<plugin>
				<artifactId>maven-assembly-plugin</artifactId>
				<configuration>
					<descriptors>
						<descriptor>assembly/pacha_src.xml</descriptor>						
					</descriptors>
					<finalName>${artifactId}-${version}</finalName>
					<outputDirectory>target</outputDirectory>
					<archive>
						<manifest>
							<mainClass>
								com.ipsis.pacha.gui.ihm.Main
							</mainClass>
							<packageName>com.ipsis.pacha</packageName>
							<addClasspath>true</addClasspath>
						</manifest>
					</archive>
				</configuration>
			</plugin>
		</plugins>
	</build>

	<dependencyManagement>
		<dependencies>
			<!-- Librairie junit -->
			<dependency>
				<groupId>junit</groupId>
				<artifactId>junit</artifactId>
				<version>4.1</version>
				<scope>test</scope>
			</dependency>

			<!-- Log -->
			<dependency>
				<groupId>commons-logging</groupId>
				<artifactId>commons-logging</artifactId>
				<version>1.1.1</version>
				<exclusions>
					<exclusion>
						<groupId>javax.servlet</groupId>
						<artifactId>servlet-api</artifactId>
					</exclusion>
				</exclusions>
			</dependency>

			<!-- Commons lang -->
			<dependency>
				<groupId>commons-lang</groupId>
				<artifactId>commons-lang</artifactId>
				<version>2.3</version>
				<type>jar</type>
			</dependency>

			<!-- HiveMind Lie interfaces aux implementations -->
			<dependency>
				<groupId>hivemind</groupId>
				<artifactId>hivemind</artifactId>
				<version>1.1-rc-1</version>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<!-- Module du projet -->
	<modules>
		<module>Common</module>
		<module>Core</module>
		<module>TreatmentInterface</module>
		<module>TreatmentImplementation</module>
		<module>GUI</module>
	</modules>
</project>

<assembly>
	<id></id>
	<formats>
		<format>jar</format>
	</formats>
	<includeBaseDirectory>true</includeBaseDirectory>
	<baseDirectory>/</baseDirectory>
	<moduleSets>
		<moduleSet>
			<binaries>
				<outputDirectory>/</outputDirectory>
				<unpack>true</unpack>
				<includeDependencies>true</includeDependencies>
				<dependencySets>
					<dependencySet>
						<excludes>
							<exclude>*:sources</exclude>
							<exclude>*:jar:*</exclude>
						</excludes>
					</dependencySet>
				</dependencySets>
			</binaries>
		</moduleSet>
	</moduleSets>
</assembly>