diff --git a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OafToOafMapper.java b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OafToOafMapper.java
index 6b6aa15e88..54594cb803 100644
--- a/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OafToOafMapper.java
+++ b/dhp-workflows/dhp-graph-mapper/src/main/java/eu/dnetlib/dhp/oa/graph/raw/OafToOafMapper.java
@@ -7,7 +7,6 @@ import static eu.dnetlib.dhp.schema.common.ModelConstants.*;
 import java.util.*;
 import java.util.stream.Collectors;
 
-import eu.dnetlib.dhp.schema.common.ModelConstants;
 import org.apache.commons.lang3.StringUtils;
 import org.dom4j.Document;
 import org.dom4j.Element;
@@ -16,6 +15,7 @@ import org.dom4j.Node;
 import com.google.common.collect.Lists;
 
 import eu.dnetlib.dhp.oa.graph.raw.common.PacePerson;
+import eu.dnetlib.dhp.schema.common.ModelConstants;
 import eu.dnetlib.dhp.schema.oaf.*;
 
 public class OafToOafMapper extends AbstractMdRecordToOafMapper {
@@ -44,7 +44,9 @@ public class OafToOafMapper extends AbstractMdRecordToOafMapper {
 
 			if (StringUtils.isNotBlank(pid) && StringUtils.isNotBlank(pidType)) {
 				author.setPid(new ArrayList<>());
-				author.getPid().add(structuredProperty(pid, qualifier(pidType, pidType, DNET_PID_TYPES, DNET_PID_TYPES), info));
+				author
+					.getPid()
+					.add(structuredProperty(pid, qualifier(pidType, pidType, DNET_PID_TYPES, DNET_PID_TYPES), info));
 			}
 
 			res.add(author);
diff --git a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java
index d7635c9ea3..5a006e3513 100644
--- a/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java
+++ b/dhp-workflows/dhp-graph-mapper/src/test/java/eu/dnetlib/dhp/oa/graph/raw/MappersTest.java
@@ -12,8 +12,6 @@ import java.util.List;
 import java.util.Map;
 import java.util.Optional;
 
-import eu.dnetlib.dhp.schema.common.ModelConstants;
-import eu.dnetlib.dhp.schema.oaf.*;
 import org.apache.commons.io.IOUtils;
 import org.apache.commons.lang3.StringUtils;
 import org.junit.jupiter.api.BeforeEach;
@@ -22,6 +20,9 @@ import org.junit.jupiter.api.extension.ExtendWith;
 import org.mockito.Mock;
 import org.mockito.junit.jupiter.MockitoExtension;
 
+import eu.dnetlib.dhp.schema.common.ModelConstants;
+import eu.dnetlib.dhp.schema.oaf.*;
+
 @ExtendWith(MockitoExtension.class)
 public class MappersTest {
 
@@ -53,15 +54,18 @@ public class MappersTest {
 		assertTrue(StringUtils.isNotBlank(p.getTitle().get(0).getValue()));
 
 		assertTrue(p.getAuthor().size() > 0);
-		Optional<Author> author = p.getAuthor()
-				.stream()
-				.filter(a -> a.getPid() != null && !a.getPid().isEmpty())
-				.findFirst();
+		Optional<Author> author = p
+			.getAuthor()
+			.stream()
+			.filter(a -> a.getPid() != null && !a.getPid().isEmpty())
+			.findFirst();
 		assertTrue(author.isPresent());
-		StructuredProperty pid = author.get().getPid()
-				.stream()
-				.findFirst()
-				.get();
+		StructuredProperty pid = author
+			.get()
+			.getPid()
+			.stream()
+			.findFirst()
+			.get();
 		assertEquals("0000-0001-6651-1178", pid.getValue());
 		assertEquals("ORCID", pid.getQualifier().getClassid());
 		assertEquals("ORCID", pid.getQualifier().getClassname());
@@ -117,15 +121,18 @@ public class MappersTest {
 		assertTrue(StringUtils.isNotBlank(d.getTitle().get(0).getValue()));
 		assertTrue(d.getAuthor().size() > 0);
 
-		Optional<Author> author = d.getAuthor()
-				.stream()
-				.filter(a -> a.getPid() != null && !a.getPid().isEmpty())
-				.findFirst();
+		Optional<Author> author = d
+			.getAuthor()
+			.stream()
+			.filter(a -> a.getPid() != null && !a.getPid().isEmpty())
+			.findFirst();
 		assertTrue(author.isPresent());
-		StructuredProperty pid = author.get().getPid()
-				.stream()
-				.findFirst()
-				.get();
+		StructuredProperty pid = author
+			.get()
+			.getPid()
+			.stream()
+			.findFirst()
+			.get();
 		assertEquals("0000-0001-9074-1619", pid.getValue());
 		assertEquals("ORCID", pid.getQualifier().getClassid());
 		assertEquals("ORCID", pid.getQualifier().getClassname());
@@ -136,9 +143,11 @@ public class MappersTest {
 		assertEquals("Theo", author.get().getName());
 
 		assertEquals(1, author.get().getAffiliation().size());
-		Optional<Field<String>> opAff = author.get().getAffiliation()
-				.stream()
-				.findFirst();
+		Optional<Field<String>> opAff = author
+			.get()
+			.getAffiliation()
+			.stream()
+			.findFirst();
 		assertTrue(opAff.isPresent());
 		Field<String> affiliation = opAff.get();
 		assertEquals("ISTI-CNR", affiliation.getValue());