diff --git a/pom.xml b/pom.xml
index 922f92b..c529788 100644
--- a/pom.xml
+++ b/pom.xml
@@ -134,6 +134,11 @@
             <version>${hibernate-annotations.version}</version>
         </dependency>
         <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+            <version>1.5.2</version>
+        </dependency>
+        <dependency>
             <groupId>com.auth0</groupId>
             <artifactId>java-jwt</artifactId>
             <version>3.2.0</version>
diff --git a/src/main/java/org/eclipse/openk/elogbook/common/timer/ContactSyncJob.java b/src/main/java/org/eclipse/openk/elogbook/common/timer/ContactSyncJob.java
index 81a35e3..e8ab611 100644
--- a/src/main/java/org/eclipse/openk/elogbook/common/timer/ContactSyncJob.java
+++ b/src/main/java/org/eclipse/openk/elogbook/common/timer/ContactSyncJob.java
@@ -5,14 +5,13 @@
 import org.eclipse.openk.elogbook.exceptions.BtbException;
 import org.quartz.Job;
 import org.quartz.JobExecutionContext;
-import org.quartz.JobExecutionException;
 
 public class ContactSyncJob implements Job {
 
     private static final Logger LOGGER = Logger.getLogger(ContactSyncJob.class.getName());
 
     @Override
-    public void execute(JobExecutionContext arg0) throws JobExecutionException {
+    public void execute(JobExecutionContext arg0) {
         LOGGER.debug("Quartz: ContactSyncJob called");
 
         try {
diff --git a/src/main/java/org/eclipse/openk/elogbook/common/timer/InitPresenceCheckJobServlet.java b/src/main/java/org/eclipse/openk/elogbook/common/timer/InitPresenceCheckJobServlet.java
index ee0d301..279072e 100644
--- a/src/main/java/org/eclipse/openk/elogbook/common/timer/InitPresenceCheckJobServlet.java
+++ b/src/main/java/org/eclipse/openk/elogbook/common/timer/InitPresenceCheckJobServlet.java
@@ -2,7 +2,13 @@
 
 import org.apache.log4j.Logger;
 import org.eclipse.openk.elogbook.common.BackendConfig;
-import org.quartz.*;
+import org.quartz.CronScheduleBuilder;
+import org.quartz.JobBuilder;
+import org.quartz.JobDetail;
+import org.quartz.Scheduler;
+import org.quartz.SchedulerException;
+import org.quartz.Trigger;
+import org.quartz.TriggerBuilder;
 import org.quartz.impl.StdSchedulerFactory;
 
 import javax.servlet.ServletException;
@@ -10,7 +16,7 @@
 
 public class InitPresenceCheckJobServlet extends HttpServlet {
 
-    private static final long serialVersionUID = -7802116179801471578L;
+    private static final long serialVersionUID = -7802116179901471578L;
 
     private static final Logger LOGGER = Logger.getLogger(InitPresenceCheckJobServlet.class.getName());
 
@@ -22,7 +28,7 @@
             LOGGER.info("Init timer: 'Check presence job' triggered with cronExpression: " + cronExpression);
 
             Trigger trigger = TriggerBuilder.newTrigger().withIdentity("CheckPresenceTrigger", "CheckPresenceTriggerGroup1")
-                    .withSchedule(CronScheduleBuilder.cronSchedule(cronExpression)).build();
+                        .withSchedule(CronScheduleBuilder.cronSchedule(cronExpression)).build();
 
             Scheduler scheduler;
 
diff --git a/src/main/resources/backendConfigDevServer.json b/src/main/resources/backendConfigDevServer.json
index 3a1c9da..c8d78d9 100644
--- a/src/main/resources/backendConfigDevServer.json
+++ b/src/main/resources/backendConfigDevServer.json
@@ -22,7 +22,7 @@
   "enableEmailPresenceCheckJob": true,
 
   "_cronSyncContacts": "0 0 1 * * ?",
-  "cronSyncContacts": "* 0/1 * * * ?",
+  "cronSyncContacts": "0 */1 * * * ?",
   "enableContactSyncJob": true,
   "contactServiceTechUser": "admin",
   "contactServiceTechUserPwd": "admin"