diff --git a/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldListImpl.java b/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldListImpl.java
index ee593b533..d4a11c050 100644
--- a/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldListImpl.java
+++ b/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldListImpl.java
@@ -136,13 +136,7 @@ public class FieldListImpl extends AbstractField implements FieldList {
 	 */
 	@Override
 	public boolean isEmpty() {
-		return Iterables.all(fields, new Predicate<Field>() {
-
-			@Override
-			public boolean apply(final Field f) {
-				return f.isEmpty();
-			}
-		});
+		return Iterables.all(fields, f -> f.isEmpty());
 	}
 
 	/*
diff --git a/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldValueImpl.java b/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldValueImpl.java
index ea31ec36e..bf861276e 100644
--- a/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldValueImpl.java
+++ b/dnet-pace-core/src/main/java/eu/dnetlib/pace/model/FieldValueImpl.java
@@ -47,13 +47,17 @@ public class FieldValueImpl extends AbstractField implements FieldValue {
 		if (value == null) return false;
 
 		switch (type) {
-		case String:
-		case JSON:
+			case String:
+			case JSON:
 			return value.toString().isEmpty();
-		case List:
-			List<?> list = (List<?>) value;
-			return list.isEmpty() || ((FieldValueImpl) list.get(0)).isEmpty();
-		case URL:
+			case List:
+				try {
+					List<?> list = (List<?>) value;
+					return list.isEmpty() || ((FieldValueImpl) list.get(0)).isEmpty();
+				} catch (Exception e) {
+					throw new RuntimeException(value.toString());
+				}
+			case URL:
 			String str = value.toString();
 			return StringUtils.isBlank(str) || !isValidURL(str);
 		default:
diff --git a/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/MapDocumentUtil.java b/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/MapDocumentUtil.java
index c55e13d36..54da950af 100644
--- a/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/MapDocumentUtil.java
+++ b/dnet-pace-core/src/main/java/eu/dnetlib/pace/util/MapDocumentUtil.java
@@ -45,7 +45,7 @@ public class MapDocumentUtil {
                     FieldListImpl fi = new FieldListImpl(fdef.getName(), fdef.getType());
                     getJPathList(fdef.getPath(), json, fdef.getType())
                             .stream()
-                            .map(item -> new FieldValueImpl(fdef.getType(), fdef.getName(), item))
+                            .map(item -> new FieldValueImpl(Type.String, fdef.getName(), item))
                             .forEach(fi::add);
                     stringField.put(fdef.getName(), fi);
                     break;
diff --git a/dnet-pace-core/src/test/java/eu/dnetlib/pace/config/ConfigTest.java b/dnet-pace-core/src/test/java/eu/dnetlib/pace/config/ConfigTest.java
index 09d7c0b9b..5d6643461 100644
--- a/dnet-pace-core/src/test/java/eu/dnetlib/pace/config/ConfigTest.java
+++ b/dnet-pace-core/src/test/java/eu/dnetlib/pace/config/ConfigTest.java
@@ -12,6 +12,7 @@ import org.junit.Test;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.stream.Collectors;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertNotNull;
@@ -68,11 +69,32 @@ public class ConfigTest extends AbstractPaceTest {
 
 		DedupConfig dedupConf = DedupConfig.load(readFromClasspath("publication.current.conf.json"));
 
-		final String json = readFromClasspath("publication.json");
+		final String json = readFromClasspath("pub2.json");
 
 		final MapDocument mapDocument = MapDocumentUtil.asMapDocumentWithJPath(dedupConf, json);
 
 		System.out.println("mapDocument = " + mapDocument.getFieldMap());
 
+
+		System.out.println(mapDocument.getFieldMap().values().stream().map(Field::isEmpty).count());
+
+    }
+
+
+
+
+
+    @Test
+    public  void testJPath()  {
+        final String json = readFromClasspath("pub2.json");
+
+        final String jpath ="$.pid";
+
+
+        final List<String> jPathList = MapDocumentUtil.getJPathList(jpath, json, Type.JSON);
+
+        System.out.println("jPathList = " + jPathList);
+
+
     }
 }
diff --git a/dnet-pace-core/src/test/java/eu/dnetlib/pace/util/UtilTest.java b/dnet-pace-core/src/test/java/eu/dnetlib/pace/util/UtilTest.java
index 36aca3346..b85be57d1 100644
--- a/dnet-pace-core/src/test/java/eu/dnetlib/pace/util/UtilTest.java
+++ b/dnet-pace-core/src/test/java/eu/dnetlib/pace/util/UtilTest.java
@@ -20,4 +20,5 @@ public class UtilTest {
         PaceResolver paceResolver = new PaceResolver();
         paceResolver.getComparator("keywordMatch", params);
     }
+
 }
diff --git a/dnet-pace-core/src/test/resources/eu/dnetlib/pace/config/pub2.json b/dnet-pace-core/src/test/resources/eu/dnetlib/pace/config/pub2.json
new file mode 100644
index 000000000..d3e5bf69e
--- /dev/null
+++ b/dnet-pace-core/src/test/resources/eu/dnetlib/pace/config/pub2.json
@@ -0,0 +1,269 @@
+{
+  "journal": {
+    "name": "",
+    "issnPrinted": "",
+    "issnOnline": "",
+    "issnLinking": "",
+    "ep": "",
+    "iss": "",
+    "sp": "",
+    "vol": "",
+    "edition": "",
+    "conferenceplace": "",
+    "conferencedate": "",
+    "dataInfo": {
+      "invisible": false,
+      "inferred": false,
+      "deletedbyinference": false,
+      "inferenceprovenance": "",
+      "provenanceaction": {
+        "classid": "",
+        "classname": "",
+        "schemeid": "",
+        "schemename": ""
+      }
+    }
+  },
+  "author": [
+    {
+      "fullname": "Clingerman Daniel J.",
+      "name": "",
+      "surname": "",
+      "rank": 1,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Morris William",
+      "name": "",
+      "surname": "",
+      "rank": 2,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Sarjeant Amy A.",
+      "name": "",
+      "surname": "",
+      "rank": 3,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Farha Omar K.",
+      "name": "",
+      "surname": "",
+      "rank": 4,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Mondloch Joseph E.",
+      "name": "",
+      "surname": "",
+      "rank": 5,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Hupp Joseph T.",
+      "name": "",
+      "surname": "",
+      "rank": 6,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Stern Charlotte",
+      "name": "",
+      "surname": "",
+      "rank": 7,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Kennedy Robert D.",
+      "name": "",
+      "surname": "",
+      "rank": 8,
+      "pid": [],
+      "affiliation": []
+    },
+    {
+      "fullname": "Mirkin Chad A.",
+      "name": "",
+      "surname": "",
+      "rank": 9,
+      "pid": [],
+      "affiliation": []
+    }
+  ],
+  "resulttype": {
+    "classid": "publication",
+    "classname": "publication",
+    "schemeid": "dnet:result_typologies",
+    "schemename": "dnet:result_typologies"
+  },
+  "language": {
+    "classid": "und",
+    "classname": "Undetermined",
+    "schemeid": "dent:languages",
+    "schemename": "dent:languages"
+  },
+  "country": [],
+  "subject": [],
+  "title": [
+    {
+      "value": "Stabilization of a highly porous metal\u2013organic framework utilizing a carborane-based linker",
+      "qualifier": {
+        "classid": "main title",
+        "classname": "main title",
+        "schemeid": "dnet:dataCite_title",
+        "schemename": "dnet:dataCite_title"
+      },
+      "dataInfo": {
+        "invisible": false,
+        "inferred": false,
+        "deletedbyinference": false,
+        "inferenceprovenance": "",
+        "provenanceaction": {
+          "classid": "",
+          "classname": "",
+          "schemeid": "",
+          "schemename": ""
+        }
+      }
+    }
+  ],
+  "relevantdate": [],
+  "description": [],
+  "dateofacceptance": {
+    "value": "",
+    "dataInfo": {
+      "invisible": false,
+      "inferred": false,
+      "deletedbyinference": false,
+      "inferenceprovenance": "",
+      "provenanceaction": {
+        "classid": "",
+        "classname": "",
+        "schemeid": "",
+        "schemename": ""
+      }
+    }
+  },
+  "publisher": {
+    "value": "Royal Society of Chemistry (RSC)",
+    "dataInfo": {
+      "invisible": false,
+      "inferred": false,
+      "deletedbyinference": false,
+      "inferenceprovenance": "",
+      "provenanceaction": {
+        "classid": "",
+        "classname": "",
+        "schemeid": "",
+        "schemename": ""
+      }
+    }
+  },
+  "embargoenddate": {
+    "value": "",
+    "dataInfo": {
+      "invisible": false,
+      "inferred": false,
+      "deletedbyinference": false,
+      "inferenceprovenance": "",
+      "provenanceaction": {
+        "classid": "",
+        "classname": "",
+        "schemeid": "",
+        "schemename": ""
+      }
+    }
+  },
+  "source": [],
+  "fulltext": [],
+  "format": [],
+  "contributor": [],
+  "resourcetype": {
+    "classid": "",
+    "classname": "",
+    "schemeid": "",
+    "schemename": ""
+  },
+  "coverage": [],
+  "refereed": {
+    "value": "",
+    "dataInfo": {
+      "invisible": false,
+      "inferred": false,
+      "deletedbyinference": false,
+      "inferenceprovenance": "",
+      "provenanceaction": {
+        "classid": "",
+        "classname": "",
+        "schemeid": "",
+        "schemename": ""
+      }
+    }
+  },
+  "context": [],
+  "id": "50|scholexplore::cf30b31310d816cccd28b514a12ea4a0",
+  "originalId": [],
+  "collectedfrom": [
+    {
+      "key": "10|openaire____::e034d6a11054f5ade9221ebac484e864",
+      "value": "scholExplorer",
+      "dataInfo": {
+        "invisible": false,
+        "inferred": false,
+        "deletedbyinference": false,
+        "inferenceprovenance": "",
+        "provenanceaction": {
+          "classid": "",
+          "classname": "",
+          "schemeid": "",
+          "schemename": ""
+        }
+      }
+    }
+  ],
+  "pid": [
+    {
+      "value": "10.1039/c4cc09212k",
+      "qualifier": {
+        "classid": "doi",
+        "classname": "doi",
+        "schemeid": "dnet:pid_types",
+        "schemename": "dnet:pid_types"
+      },
+      "dataInfo": {
+        "invisible": false,
+        "inferred": false,
+        "deletedbyinference": false,
+        "inferenceprovenance": "",
+        "provenanceaction": {
+          "classid": "",
+          "classname": "",
+          "schemeid": "",
+          "schemename": ""
+        }
+      }
+    }
+  ],
+  "extraInfo": [],
+  "dataInfo": {
+    "invisible": false,
+    "inferred": true,
+    "deletedbyinference": true,
+    "inferenceprovenance": "dedup-similarity-result-levenstein",
+    "provenanceaction": {
+      "classid": "sysimport:actionset",
+      "classname": "sysimport:actionset",
+      "schemeid": "dnet:provenanceActions",
+      "schemename": "dnet:provenanceActions"
+    }
+  },
+  "lastupdatetimestamp": 0
+}