diff --git a/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/MkdirsCommand.java b/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/MkdirsCommand.java
index 31f89f96a6ab890ea668a5b22c00a08fc15d2193..d8cd065e0025904ca6765cbc68aa69ba56810b63 100644
--- a/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/MkdirsCommand.java
+++ b/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/MkdirsCommand.java
@@ -18,12 +18,8 @@ package ch.systemsx.cisd.etlserver.registrator.api.v1.impl;
 
 import java.io.File;
 
-import org.apache.log4j.Logger;
-
 import ch.systemsx.cisd.common.filesystem.FileOperations;
 import ch.systemsx.cisd.common.filesystem.IFileOperations;
-import ch.systemsx.cisd.common.logging.LogCategory;
-import ch.systemsx.cisd.common.logging.LogFactory;
 
 /**
  * Creates a directory and all necessary intermediate dirctories.
@@ -34,9 +30,6 @@ public class MkdirsCommand extends AbstractTransactionalCommand
 {
     private static final long serialVersionUID = 1L;
 
-    private static final Logger operationLog = LogFactory.getLogger(LogCategory.OPERATION,
-            MkdirsCommand.class);
-
     private final String directoryAbsoutePath;
 
     public MkdirsCommand(String directoryAbsoutePath)
@@ -67,7 +60,7 @@ public class MkdirsCommand extends AbstractTransactionalCommand
         fileOperations.delete(src);
         if (src.exists())
         {
-            operationLog.error("Could not delete directory '" + src + "'.");
+            getOperationLog().error("Could not delete directory '" + src + "'.");
         }
     }
 
diff --git a/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/NewFileCommand.java b/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/NewFileCommand.java
index 6949c02ee456281edcac23f8ab68442cfea5d431..78c120cc561b76873d40d8d49db8677375eeef0c 100644
--- a/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/NewFileCommand.java
+++ b/datastore_server/source/java/ch/systemsx/cisd/etlserver/registrator/api/v1/impl/NewFileCommand.java
@@ -18,12 +18,8 @@ package ch.systemsx.cisd.etlserver.registrator.api.v1.impl;
 
 import java.io.File;
 
-import org.apache.log4j.Logger;
-
 import ch.systemsx.cisd.common.filesystem.FileOperations;
 import ch.systemsx.cisd.common.filesystem.IFileOperations;
-import ch.systemsx.cisd.common.logging.LogCategory;
-import ch.systemsx.cisd.common.logging.LogFactory;
 
 /**
  * Creates a directory and all necessary intermediate dirctories.
@@ -34,9 +30,6 @@ public class NewFileCommand extends AbstractTransactionalCommand
 {
     private static final long serialVersionUID = 1L;
 
-    private static final Logger operationLog = LogFactory.getLogger(LogCategory.OPERATION,
-            NewFileCommand.class);
-
     private final String fileAbsolutePath;
 
     public NewFileCommand(String directoryAbsoutePath)
@@ -67,7 +60,7 @@ public class NewFileCommand extends AbstractTransactionalCommand
         fileOperations.delete(src);
         if (src.exists())
         {
-            operationLog.error("Could not delete file '" + src + "'.");
+            getOperationLog().error("Could not delete file '" + src + "'.");
         }
 
     }