Maven, duh.

Client POM

<project>
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>cz.projectsurvive</groupId>
        <artifactId>minecraftshield</artifactId>
        <version>0.1.0</version>
    </parent>
    <name>MinecraftShield Client</name>
    <artifactId>minecraftshield-client</artifactId>
    <version>0.1.0</version>
    <dependencies>
        <dependency>
            <groupId>cz.projectsurvive</groupId>
            <artifactId>minecraftshield-core</artifactId>
            <version>0.1.0</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
                <dependencies>
                    <dependency>
                        <groupId>cz.projectsurvive</groupId>
                        <artifactId>minecraftshield-core</artifactId>
                        <version>0.1.0</version>
                    </dependency>
                </dependencies>
            </plugin>
        </plugins>
    </build>
</project>

Core POM

<project>
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>cz.projectsurvive</groupId>
        <artifactId>minecraftshield</artifactId>
        <version>0.1.0</version>
    </parent>
    <name>MinecraftShield Core</name>
    <artifactId>minecraftshield-core</artifactId>
    <version>0.1.0</version>
    <dependencies>
        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>18.0</version>
        </dependency>
        <dependency>
            <groupId>com.esotericsoftware</groupId>
            <artifactId>kryonet</artifactId>
            <version>2.22.0-RC1</version>
        </dependency>
    </dependencies>
    <build>
        <plugins>
            <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

Parent POM

<project>
    <modelVersion>4.0.0</modelVersion>
    <name>MinecraftShield</name>
    <groupId>cz.projectsurvive</groupId>
    <artifactId>minecraftshield</artifactId>
    <version>0.1.0</version>
    <modules>
        <module>Launcher</module>
        <module>Core</module>
        <module>Client</module>
        <module>Server</module>
    </modules>
    <packaging>pom</packaging>
    <build>
        <finalName>${project.name} ${version}</finalName>
    </build>
</project>