diff --git a/src/main/java/org/gcube/dataanalysis/executor/nodes/transducers/bionym/BionymFlexibleWorkflowTransducer.java b/src/main/java/org/gcube/dataanalysis/executor/nodes/transducers/bionym/BionymFlexibleWorkflowTransducer.java
index c2b6ea8..fae1a2d 100644
--- a/src/main/java/org/gcube/dataanalysis/executor/nodes/transducers/bionym/BionymFlexibleWorkflowTransducer.java
+++ b/src/main/java/org/gcube/dataanalysis/executor/nodes/transducers/bionym/BionymFlexibleWorkflowTransducer.java
@@ -37,6 +37,8 @@ import org.gcube.dataanalysis.executor.nodes.transducers.bionym.interfaces.Match
 import org.gcube.dataanalysis.executor.nodes.transducers.bionym.utils.YasmeenGlobalParameters;
 import org.gcube.dataanalysis.executor.scripts.OSCommand;
 import org.hibernate.SessionFactory;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class BionymFlexibleWorkflowTransducer extends ActorNode {
 	//SM parameters
@@ -50,6 +52,8 @@ public class BionymFlexibleWorkflowTransducer extends ActorNode {
 	String destinationTable;
 	String destinationTableLabel;
 	
+	private static Logger logger = LoggerFactory.getLogger(BionymFlexibleWorkflowTransducer.class);
+	
 	//Table
 	public static String headers = "SOURCE_DATA,TARGET_DATA_SCIENTIFIC_NAME,TARGET_DATA_AUTHORITY,MATCHING_SCORE,TARGET_DATA_SOURCE,TARGET_DATA_ID";
 	private static String createOutputTable = "CREATE TABLE %1$s (SOURCE_DATA character varying(255),  TARGET_DATA_SCIENTIFIC_NAME character varying(255), TARGET_DATA_AUTHORITY character varying(255), MATCHING_SCORE real,TARGET_DATA_SOURCE character varying, TARGET_DATA_ID character varying)";
@@ -233,9 +237,10 @@ public class BionymFlexibleWorkflowTransducer extends ActorNode {
 			status = 0;
 			long t0 = System.currentTimeMillis();
 			// rebuild variables
-			System.out.println("Restoring configuration");
+			logger.trace("Restoring configuration");
 			AlgorithmConfiguration config = Transformations.restoreConfig(new File(sandboxFolder, nodeConfigurationFileObject).getAbsolutePath());
 			config.setConfigPath(sandboxFolder);
+			config.setAlgorithmClassLoader(Thread.currentThread().getContextClassLoader());
 			dbconnection = DatabaseUtils.initDBSession(config);
 			
 			String destinationTable = config.getParam(destinationTableParam);
@@ -250,15 +255,15 @@ public class BionymFlexibleWorkflowTransducer extends ActorNode {
 			String overallMaxResults= config.getParam(YasmeenGlobalParameters.overallMaxResults);
 			
 			
-			System.out.println("Destination Table: " + destinationTable);
-			System.out.println("Origin Table: " + originTable);
-			System.out.println("Column of names: " + rawnamesColumn);
-			System.out.println("Parser to use: " + parser);
-			System.out.println("Accuracy vs Speed: " + accuracyvsspeed);
-			System.out.println("Reference Dataset: " + reference);
-			System.out.println("Do Preprocessing: " + doPreprocess);
-			System.out.println("Use Stemming:" + usestemming);
-			System.out.println("Overall MaxResults:" + overallMaxResults);
+			logger.trace("Destination Table: " + destinationTable);
+			logger.trace("Origin Table: " + originTable);
+			logger.trace("Column of names: " + rawnamesColumn);
+			logger.trace("Parser to use: " + parser);
+			logger.trace("Accuracy vs Speed: " + accuracyvsspeed);
+			logger.trace("Reference Dataset: " + reference);
+			logger.trace("Do Preprocessing: " + doPreprocess);
+			logger.trace("Use Stemming:" + usestemming);
+			logger.trace("Overall MaxResults:" + overallMaxResults);
 			
 			//prepare the WF
 			HashMap<String,String> globalparameters = new HashMap<String, String>();
@@ -270,36 +275,36 @@ public class BionymFlexibleWorkflowTransducer extends ActorNode {
 			globalparameters.put(YasmeenGlobalParameters.performanceParam, accuracyvsspeed);
 			globalparameters.put(YasmeenGlobalParameters.taxaAuthorityFileParam, reference);
 			globalparameters.put(YasmeenGlobalParameters.useStemmedGenusAndSpecies, usestemming);
-			System.out.println("Configuration Restored! - Time: "+(System.currentTimeMillis()-t0));
+			logger.trace("Configuration Restored! - Time: "+(System.currentTimeMillis()-t0));
 			
 			// retrieve the list of names to process
 			long t1 = System.currentTimeMillis();
-			System.out.println("Retrieving names to process");
+			logger.trace("Retrieving names to process");
 			String query = DatabaseUtils.getDinstictElements(originTable, rawnamesColumn, "")+" offset "+rightStartIndex+" limit "+numberOfRightElementsToProcess;
 			List<Object> rawnames = DatabaseFactory.executeSQLQuery(query, dbconnection);
-			System.out.println("Retrieved a total of "+rawnames.size()+" species");
+			logger.trace("Retrieved a total of "+rawnames.size()+" species");
 			//modification due to the limit and offset on the query
 			rightStartIndex = 0;
 			
 			int end = rightStartIndex + numberOfRightElementsToProcess;
 			
-			System.out.println("Processing from "+rightStartIndex+" to "+end);
+			logger.trace("Processing from "+rightStartIndex+" to "+end);
 			List<String> rawnamesFiltered = new ArrayList<String>();
 			for (int i = rightStartIndex; i < end; i++) {
 				String raw = "" + rawnames.get(i);
-//				System.out.println("Taking species:"+raw);
+//				logger.trace("Taking species:"+raw);
 				rawnamesFiltered.add(raw.replaceAll("^'", "").replaceAll("'$", ""));
 			}
 			int rawscounter = rawnamesFiltered.size();
-			System.out.println("Retrieve from DB - Time: "+(System.currentTimeMillis()-t1));
+			logger.trace("Retrieve from DB - Time: "+(System.currentTimeMillis()-t1));
 			
 			long t2 = System.currentTimeMillis();
-			System.out.println("Processing " + rawscounter + " species..");
+			logger.trace("Processing " + rawscounter + " species..");
 			// prepare the environment
 			try {
 				OSCommand.ExecuteGetLine("chmod +x *", null);
 			} catch (Exception e) {
-				System.out.println("WARNING: could not change the permissions");
+				logger.trace("WARNING: could not change the permissions");
 			}
 			
 			int overallMR = 10;
@@ -312,10 +317,10 @@ public class BionymFlexibleWorkflowTransducer extends ActorNode {
 			List<Matcher> matchers = buildMatcherList(config, sandboxFolder, globalparameters);
 			if (matchers!=null)
 				bionym.resetMatchers(matchers);
-			 System.out.println("WF Initialization - Time: "+(System.currentTimeMillis()-t2));
+			 logger.trace("WF Initialization - Time: "+(System.currentTimeMillis()-t2));
 			 
 			MatcherOutput output = bionym.executeChainedWorkflow(rawnamesFiltered);
-			System.out.println("Workflow Executed");
+			logger.trace("Workflow Executed");
 			long t3 = System.currentTimeMillis();
 			int nEntries = output.getEntriesNumber();
 			List<String[]> toWrite = new ArrayList<String[]>(); 
@@ -333,14 +338,12 @@ public class BionymFlexibleWorkflowTransducer extends ActorNode {
 			}
 			//write on DB
 			DatabaseUtils.insertChunksIntoTable(destinationTable, headers, toWrite, 5000, dbconnection);
-			System.out.println("Write on DB - Time: "+(System.currentTimeMillis()-t3));
+			logger.trace("Write on DB - Time: "+(System.currentTimeMillis()-t3));
 			
-			System.out.println("The procedure finished successfully. Processed " + rawscounter + " species.");
-			System.out.println("Elapsed Time " + (System.currentTimeMillis() - t0) + " ms");
+			logger.trace("The procedure finished successfully. Processed " + rawscounter + " species.");
+			logger.trace("Elapsed Time " + (System.currentTimeMillis() - t0) + " ms");
 		} catch (Exception e) {
-			e.printStackTrace();
-			System.out.println("warning: error in node execution " + e.getLocalizedMessage());
-			System.err.println("Error in node execution " + e.getLocalizedMessage());
+			logger.error("warning: error in node execution ", e);
 			return -1;
 		} finally {
 			if (dbconnection != null)