dhp-workflows eu.dnetlib.dhp 1.0.2 4.0.0 dhp-graph-mapper org.apache.spark spark-core_2.11 org.apache.spark spark-sql_2.11 eu.dnetlib dnet-openaire-data-protos com.googlecode.protobuf-java-format protobuf-java-format eu.dnetlib.dhp dhp-common 1.0.2 eu.dnetlib.dhp dhp-schemas 1.0.2 de.javakaffee kryo-serializers