diff --git a/src/main/java/eu/dnetlib/validator2/validation/StandardValidationResult.java b/src/main/java/eu/dnetlib/validator2/validation/StandardValidationResult.java
index 1e7f635..3befcbf 100644
--- a/src/main/java/eu/dnetlib/validator2/validation/StandardValidationResult.java
+++ b/src/main/java/eu/dnetlib/validator2/validation/StandardValidationResult.java
@@ -1,10 +1,11 @@
 package eu.dnetlib.validator2.validation;
 
+import java.io.Serializable;
 import java.util.Map;
 
 import static eu.dnetlib.validator2.validation.guideline.Guideline.Result;
 
-public class StandardValidationResult implements XMLApplicationProfile.ValidationResult {
+public class StandardValidationResult implements XMLApplicationProfile.ValidationResult, Serializable {
 
     private final String              id;
     private final double              score;
diff --git a/src/main/java/eu/dnetlib/validator2/validation/guideline/StandardResult.java b/src/main/java/eu/dnetlib/validator2/validation/guideline/StandardResult.java
index 1dfb5f7..9e3c51e 100644
--- a/src/main/java/eu/dnetlib/validator2/validation/guideline/StandardResult.java
+++ b/src/main/java/eu/dnetlib/validator2/validation/guideline/StandardResult.java
@@ -2,10 +2,11 @@ package eu.dnetlib.validator2.validation.guideline;
 
 import eu.dnetlib.validator2.engine.Status;
 
+import java.io.Serializable;
 import java.util.Collections;
 import java.util.List;
 
-public final class StandardResult implements Guideline.Result {
+public final class StandardResult implements Guideline.Result, Serializable {
 
     private static final List<String> EMPTY = Collections.emptyList();
 
diff --git a/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java b/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java
index bedf62b..ea66d3e 100644
--- a/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java
+++ b/src/main/java/eu/dnetlib/validator2/validation/guideline/openaire/AbstractOpenAireProfile.java
@@ -16,10 +16,11 @@ import org.w3c.dom.Document;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;
 
+import java.io.Serializable;
 import java.util.HashMap;
 import java.util.Map;
 
-public abstract class AbstractOpenAireProfile implements XMLApplicationProfile {
+public abstract class AbstractOpenAireProfile implements XMLApplicationProfile, Serializable {
 
     private static final Logger logger = LoggerFactory.getLogger(AbstractOpenAireProfile.class);
 
diff --git a/src/test/java/eu/dnetlib/validator2/engine/TestUtils.java b/src/main/java/eu/dnetlib/validator2/validation/utils/TestUtils.java
similarity index 94%
rename from src/test/java/eu/dnetlib/validator2/engine/TestUtils.java
rename to src/main/java/eu/dnetlib/validator2/validation/utils/TestUtils.java
index ae740f3..c87c974 100644
--- a/src/test/java/eu/dnetlib/validator2/engine/TestUtils.java
+++ b/src/main/java/eu/dnetlib/validator2/validation/utils/TestUtils.java
@@ -1,4 +1,4 @@
-package eu.dnetlib.validator2.engine;
+package eu.dnetlib.validator2.validation.utils;
 
 import org.slf4j.LoggerFactory;