diff --git a/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/DMConverter.java b/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/DMConverter.java
index 37d9528..53234b1 100644
--- a/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/DMConverter.java
+++ b/src/main/java/org/gcube/common/workspacetaskexecutor/dataminer/DMConverter.java
@@ -131,52 +131,59 @@ public class DMConverter {
 		if(parameter==null)
 			return null;
 
-		String defaultValue = "";
+		List<String> defaultValues = null;
 		switch (parameter.getTypology()) {
 		case FILE:
 			FileParameter fp = (FileParameter) parameter;
 			break;
 		case OBJECT:
 			ObjectParameter op = (ObjectParameter) parameter;
-			defaultValue = op.getDefaultValue();
+			defaultValues = new ArrayList<String>(1);
+			defaultValues.add(op.getDefaultValue());
 			break;
 		case TABULAR:
 			TabularParameter tp = (TabularParameter) parameter;
 			break;
 		case ENUM:
 			EnumParameter ep = (EnumParameter) parameter;
-			defaultValue = ep.getDefaultValue();
+			defaultValues = new ArrayList<String>(ep.getValues().size());
+			defaultValues.addAll(ep.getValues());
+			System.out.println("############### The VALUES ARE" +ep.getValues());
 			break;
 		case LIST:
 			ListParameter lp = (ListParameter) parameter;
 			break;
 		case COLUMN:
 			ColumnParameter cp = (ColumnParameter) parameter;
-			defaultValue = cp.getDefaultColumn();
+			defaultValues = new ArrayList<String>(1);
+			defaultValues.add(cp.getDefaultColumn());
 			break;
 		case COLUMN_LIST:
 			ColumnListParameter clp = (ColumnListParameter) parameter;
 			break;
 		case DATE:
 			DateParameter dp = (DateParameter) parameter;
-			defaultValue = dp.getDefaultValue();
+			defaultValues = new ArrayList<String>(1);
+			defaultValues.add(dp.getDefaultValue());
 			break;
 		case TABULAR_LIST:
 			TabularListParameter tlp = (TabularListParameter) parameter;
 			break;
 		case TIME:
 			TimeParameter timep = (TimeParameter) parameter;
-			defaultValue = timep.getDefaultValue();
+			defaultValues = new ArrayList<String>(1);
+			defaultValues.add(timep.getDefaultValue());
 			break;
 		case WKT:
 			WKTParameter wktp = (WKTParameter) parameter;
-			defaultValue = wktp.getDefaultValue();
+			defaultValues = new ArrayList<String>(1);
+			defaultValues.add(wktp.getDefaultValue());
 			break;
 		default:
 			break;
 		}
 
-		return new TaskParameter(parameter.getName(), parameter.getValue(), defaultValue, toTaskParameterType(parameter.getTypology()));
+		return new TaskParameter(parameter.getName(), parameter.getValue(), defaultValues, toTaskParameterType(parameter.getTypology()));
 
 	}
 
diff --git a/src/main/java/org/gcube/common/workspacetaskexecutor/shared/TaskParameter.java b/src/main/java/org/gcube/common/workspacetaskexecutor/shared/TaskParameter.java
index db10e6a..a2ee54a 100644
--- a/src/main/java/org/gcube/common/workspacetaskexecutor/shared/TaskParameter.java
+++ b/src/main/java/org/gcube/common/workspacetaskexecutor/shared/TaskParameter.java
@@ -4,6 +4,7 @@
 package org.gcube.common.workspacetaskexecutor.shared;
 
 import java.io.Serializable;
+import java.util.List;
 
 import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
 
@@ -23,7 +24,7 @@ public class TaskParameter implements Serializable{
 	private String key;
 	private String value;
 	@JsonIgnoreProperties
-	private String defaultValue; //optional
+	private List<String> defaultValues; //optional
 	private TaskParameterType type;
 
 	/**
@@ -38,12 +39,13 @@ public class TaskParameter implements Serializable{
 	 *
 	 * @param key the key
 	 * @param value the value
+	 * @param defaultValues the default values
 	 * @param type the type
 	 */
-	public TaskParameter(String key, String value, String defaultValue, TaskParameterType type) {
+	public TaskParameter(String key, String value, List<String> defaultValues, TaskParameterType type) {
 		this.key = key;
 		this.value = value;
-		this.defaultValue = defaultValue;
+		this.defaultValues = defaultValues;
 		this.type = type;
 	}
 
@@ -66,15 +68,6 @@ public class TaskParameter implements Serializable{
 	}
 
 
-	/**
-	 * @return the defaultValue
-	 */
-	public String getDefaultValue() {
-
-		return defaultValue;
-	}
-
-
 	/**
 	 * @return the type
 	 */
@@ -103,14 +96,22 @@ public class TaskParameter implements Serializable{
 
 
 	/**
-	 * @param defaultValue the defaultValue to set
+	 * @return the defaultValues
 	 */
-	public void setDefaultValue(String defaultValue) {
+	public List<String> getDefaultValues() {
 
-		this.defaultValue = defaultValue;
+		return defaultValues;
 	}
 
 
+	/**
+	 * @param defaultValues the defaultValues to set
+	 */
+	public void setDefaultValues(List<String> defaultValues) {
+
+		this.defaultValues = defaultValues;
+	}
+
 	/**
 	 * @param type the type to set
 	 */
@@ -130,8 +131,8 @@ public class TaskParameter implements Serializable{
 		builder.append(key);
 		builder.append(", value=");
 		builder.append(value);
-		builder.append(", defaultValue=");
-		builder.append(defaultValue);
+		builder.append(", defaultValues=");
+		builder.append(defaultValues);
 		builder.append(", type=");
 		builder.append(type);
 		builder.append("]");