diff --git a/pom.xml b/pom.xml
index 5e94623..621808a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -433,7 +433,9 @@
 			<exclusions>
 				<exclusion>
 					<artifactId>52n-wps-algorithm</artifactId>
-					<groupId>org.n52.wps</groupId>
+					<groupId>
+						org.n52.wps
+					</groupId>
 				</exclusion>
 			</exclusions>
 		</dependency>
@@ -691,6 +693,15 @@
 			<artifactId>jstl</artifactId>
 			<version>1.2</version>
 		</dependency>
+
+		<!-- https://mvnrepository.com/artifact/ch.qos.logback/logback-classic -->
+		<dependency>
+			<groupId>ch.qos.logback</groupId>
+			<artifactId>logback-classic</artifactId>
+			<version>1.1.11</version>
+		</dependency>
+
+
 		<dependency>
 			<groupId>com.thetransactioncompany</groupId>
 			<artifactId>cors-filter</artifactId>
diff --git a/src/main/java/org/gcube/data/analysis/wps/WebProcessingService.java b/src/main/java/org/gcube/data/analysis/wps/WebProcessingService.java
index 36cbd40..ac8a093 100644
--- a/src/main/java/org/gcube/data/analysis/wps/WebProcessingService.java
+++ b/src/main/java/org/gcube/data/analysis/wps/WebProcessingService.java
@@ -92,8 +92,10 @@ public class WebProcessingService extends HttpServlet {
 		
 	@Override
 	public void init() throws ServletException {
+		LOGGER.info("initialising WPS");
 		String  dir = (String)context.application().getInitParameter(DIRECTORY_PARAM);
 		GcubeAlgorithmRepository.setUpdater(new AlgorithmUpdater(dir));
+		LOGGER.info("WPS initialised");
 	}
 
 	/**
diff --git a/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java b/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java
index 084e35b..d9c95f3 100644
--- a/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java
+++ b/src/main/java/org/gcube/data/analysis/wps/repository/AlgorithmUpdater.java
@@ -1,6 +1,7 @@
 package org.gcube.data.analysis.wps.repository;
 
 import static java.nio.file.StandardWatchEventKinds.ENTRY_CREATE;
+import static java.nio.file.StandardWatchEventKinds.ENTRY_MODIFY;
 import static java.nio.file.StandardWatchEventKinds.OVERFLOW;
 
 import java.io.IOException;
@@ -66,7 +67,7 @@ public final class AlgorithmUpdater {
 				this.loader = loader;
 				//TODO: change with something from configuration
 				dir = Paths.get(algorithmDirectory);
-				dir.register(watcher, ENTRY_CREATE);
+				dir.register(watcher, ENTRY_CREATE, ENTRY_MODIFY);
 			} catch (IOException e) {
 				throw new RuntimeException(e);
 			}
@@ -75,7 +76,7 @@ public final class AlgorithmUpdater {
 		@SuppressWarnings("unchecked")
 		public void run(){
 			for (;;) {
-
+				log.info("direcotry watcher is running");	
 				// wait for key to be signaled
 				WatchKey key;
 				try {
@@ -87,7 +88,7 @@ public final class AlgorithmUpdater {
 
 				for (WatchEvent<?> event: key.pollEvents()) {
 					WatchEvent.Kind<?> kind = event.kind();
-
+					log.debug("new event thrown for directory watcher");
 					// This key is registered only
 					// for ENTRY_CREATE events,
 					// but an OVERFLOW event can