diff --git a/main/src/com/google/refine/model/recon/ReconConfig.java b/main/src/com/google/refine/model/recon/ReconConfig.java
index fc9a97de4..9ce95a66a 100644
--- a/main/src/com/google/refine/model/recon/ReconConfig.java
+++ b/main/src/com/google/refine/model/recon/ReconConfig.java
@@ -1,128 +1,132 @@
-/*
-
-Copyright 2010, Google Inc.
-All rights reserved.
-
-Redistribution and use in source and binary forms, with or without
-modification, are permitted provided that the following conditions are
-met:
-
-    * Redistributions of source code must retain the above copyright
-notice, this list of conditions and the following disclaimer.
-    * Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the following disclaimer
-in the documentation and/or other materials provided with the
-distribution.
-    * Neither the name of Google Inc. nor the names of its
-contributors may be used to endorse or promote products derived from
-this software without specific prior written permission.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-*/
-
-package com.google.refine.model.recon;
-
-import java.io.Writer;
-import java.lang.reflect.Method;
-import java.util.HashMap;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.Map;
-import java.util.Properties;
-
-import org.json.JSONException;
-import org.json.JSONObject;
-import org.json.JSONWriter;
-
-import com.google.refine.Jsonizable;
-import com.google.refine.model.Cell;
-import com.google.refine.model.Project;
-import com.google.refine.model.Recon;
-import com.google.refine.model.Row;
-
-import edu.mit.simile.butterfly.ButterflyModule;
-
-abstract public class ReconConfig implements Jsonizable {
-    static final public Map<String, List<Class<? extends ReconConfig>>> s_opNameToClass =
-        new HashMap<String, List<Class<? extends ReconConfig>>>();
-    
-    static final public Map<Class<? extends ReconConfig>, String> s_opClassToName =
-        new HashMap<Class<? extends ReconConfig>, String>();
-    
-    static public void registerReconConfig(ButterflyModule module, String name, Class<? extends ReconConfig> klass) {
-        String key = module.getName() + "/" + name;
-        
-        s_opClassToName.put(klass, key);
-        
-        List<Class<? extends ReconConfig>> classes = s_opNameToClass.get(key);
-        if (classes == null) {
-            classes = new LinkedList<Class<? extends ReconConfig>>();
-            s_opNameToClass.put(key, classes);
-        }
-        classes.add(klass);
-    }
-    
-    static public ReconConfig reconstruct(JSONObject obj) throws Exception {
-        try {
-            String mode = obj.getString("mode");
-            
-            // Backward compatibility
-            if ("extend".equals(mode) || "strict".equals(mode)) {
-                mode = "freebase/" + mode;
-            } else if ("heuristic".equals(mode)) {
-                mode = "core/standard-service"; // legacy
-            } else if (!mode.contains("/")) {
-                mode = "core/" + mode;
-            }
-            
-            List<Class<? extends ReconConfig>> classes = s_opNameToClass.get(mode);
-            if (classes != null && classes.size() > 0) {
-                Class<? extends ReconConfig> klass = classes.get(classes.size() - 1);
-                
-                Method reconstruct = klass.getMethod("reconstruct", JSONObject.class);
-                if (reconstruct != null) {
-                    return (ReconConfig) reconstruct.invoke(null, obj);
-                }
-            }
-        } catch (Exception e) {
-            e.printStackTrace();
-        }
-        return null;
-    }
-    
-    abstract public int getBatchSize();
-    
-    abstract public String getBriefDescription(Project project, String columnName);
-    
-    abstract public ReconJob createJob(
-        Project     project, 
-        int         rowIndex, 
-        Row         row,
-        String      columnName,
-        Cell        cell
-    );
-    
-    abstract public List<Recon> batchRecon(List<ReconJob> jobs, long historyEntryID);
-    
-    abstract public Recon createNewRecon(long historyEntryID);
-    
-    public void save(Writer writer) {
-        JSONWriter jsonWriter = new JSONWriter(writer);
-        try {
-            write(jsonWriter, new Properties());
-        } catch (JSONException e) {
-            e.printStackTrace();
-        }
-    }
-}
+/*
+
+Copyright 2010, Google Inc.
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+    * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+    * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY           
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*/
+
+package com.google.refine.model.recon;
+
+import java.io.Writer;
+import java.lang.reflect.Method;
+import java.util.HashMap;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Map;
+import java.util.Properties;
+
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.json.JSONWriter;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import com.google.refine.Jsonizable;
+import com.google.refine.model.Cell;
+import com.google.refine.model.Project;
+import com.google.refine.model.Recon;
+import com.google.refine.model.Row;
+
+import edu.mit.simile.butterfly.ButterflyModule;
+
+abstract public class ReconConfig implements Jsonizable {
+    final static protected Logger LOGGER = LoggerFactory.getLogger("recon-config");
+
+    static final public Map<String, List<Class<? extends ReconConfig>>> s_opNameToClass =
+        new HashMap<String, List<Class<? extends ReconConfig>>>();
+    
+    static final public Map<Class<? extends ReconConfig>, String> s_opClassToName =
+        new HashMap<Class<? extends ReconConfig>, String>();
+    
+    static public void registerReconConfig(ButterflyModule module, String name, Class<? extends ReconConfig> klass) {
+        String key = module.getName() + "/" + name;
+        
+        s_opClassToName.put(klass, key);
+        
+        List<Class<? extends ReconConfig>> classes = s_opNameToClass.get(key);
+        if (classes == null) {
+            classes = new LinkedList<Class<? extends ReconConfig>>();
+            s_opNameToClass.put(key, classes);
+        }
+        classes.add(klass);
+    }
+    
+    static public ReconConfig reconstruct(JSONObject obj) throws Exception {
+        try {
+            String mode = obj.getString("mode");
+            
+            // Backward compatibility
+            if ("extend".equals(mode) || "strict".equals(mode)) {
+                mode = "freebase/" + mode;
+            } else if ("heuristic".equals(mode)) {
+                mode = "core/standard-service"; // legacy
+            } else if (!mode.contains("/")) {
+                mode = "core/" + mode;
+            }
+            
+            List<Class<? extends ReconConfig>> classes = s_opNameToClass.get(mode);
+            if (classes != null && classes.size() > 0) {
+                Class<? extends ReconConfig> klass = classes.get(classes.size() - 1);
+                
+                Method reconstruct = klass.getMethod("reconstruct", JSONObject.class);
+                if (reconstruct != null) {
+                    return (ReconConfig) reconstruct.invoke(null, obj);
+                }
+            }
+        } catch (Exception e) {
+            LOGGER.error("Reconstruct failed",e);
+        }
+        return null;
+    }
+    
+    abstract public int getBatchSize();
+    
+    abstract public String getBriefDescription(Project project, String columnName);
+    
+    abstract public ReconJob createJob(
+        Project     project, 
+        int         rowIndex, 
+        Row         row,
+        String      columnName,
+        Cell        cell
+    );
+    
+    abstract public List<Recon> batchRecon(List<ReconJob> jobs, long historyEntryID);
+    
+    abstract public Recon createNewRecon(long historyEntryID);
+    
+    public void save(Writer writer) {
+        JSONWriter jsonWriter = new JSONWriter(writer);
+        try {
+            write(jsonWriter, new Properties());
+        } catch (JSONException e) {
+           LOGGER.error("Save failed",e);
+        }
+    }
+}