I have solved the issue by adding this dependencies into my manifest.mf file. In my .pom file I added the build plugin:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-ear-plugin</artifactId>
<configuration>
<archive>
<manifestEntries>
<Dependencies>com.jersey.jersey-server,com.jersey.jersey-client,com.jersey.jersey-json</Dependencies>
</manifestEntries>
</archive>
</configuration>
</plugin>
that added references to the needed .jar files in my manifest file