you have both default jar and jar with classifier because you added execution
with specific configuration to package
phase, but maven-jar-plugin
already have default execution
on package
phase.
If you want only one jar after mvn package
command you should adjust default configuration of maven-jar-plugin
<profiles>
<profile>
<id>client</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<configuration>
<classifier>client</classifier>
<includes>
<include>com/xxx/yyy/zzz/*</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>
</profile>
</profiles>
or, as alternative, you can add id
tag to execution with default-jar
value, to allow only one execution of maven-jar-plugin
<profiles>
<profile>
<id>client</id>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.4</version>
<executions>
<execution>
<id>default-jar</id>
<phase>package</phase>
<goals>
<goal>jar</goal>
</goals>
<configuration>
<classifier>client</classifier>
<includes>
<include>com/xxx/yyy/zzz/*</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</profile>
</profiles>