diff --git a/main/src/com/google/refine/exporters/sql/SqlInsertBuilder.java b/main/src/com/google/refine/exporters/sql/SqlInsertBuilder.java
index 8c49e2b01..54740c676 100755
--- a/main/src/com/google/refine/exporters/sql/SqlInsertBuilder.java
+++ b/main/src/com/google/refine/exporters/sql/SqlInsertBuilder.java
@@ -132,7 +132,7 @@ public class SqlInsertBuilder {
                         
                         if(type.equals(SqlData.SQL_TYPE_NUMERIC)) {//test if number is numeric (decimal(p,s) number is valid)
                            
-                            if(!NumberUtils.isNumber(val.getText())){
+                            if(!NumberUtils.isCreatable(val.getText())){
                                 throw new SqlExporterException(
                                         val.getText() + " is not compatible with column type :" + type);
                             }
@@ -179,15 +179,14 @@ public class SqlInsertBuilder {
         }
 
         boolean trimColNames = options == null ? false : JSONUtilities.getBoolean(options, "trimColumnNames", false);
-        String colNamesWithSep = columns.stream().map(col -> col.replaceAll("\\s", "")).collect(Collectors.joining(","));;
+        String colNamesWithSep = columns.stream().map(col -> col.replaceAll("\\s", "")).collect(Collectors.joining(","));
         if(!trimColNames) {
            colNamesWithSep = columns.stream().collect(Collectors.joining(","));  
         }
-        
+
         String valuesString = values.toString();
-        valuesString = valuesString.substring(0, valuesString.length() - 1);
-        
-        
+        valuesString = valuesString.substring(0, Integer.max(0, valuesString.length() - 1));
+
         StringBuffer sql = new StringBuffer();
 
         sql.append("INSERT INTO ").append(table);
diff --git a/main/src/com/google/refine/importers/tree/XmlImportUtilities.java b/main/src/com/google/refine/importers/tree/XmlImportUtilities.java
index f7325efec..52ad02da7 100644
--- a/main/src/com/google/refine/importers/tree/XmlImportUtilities.java
+++ b/main/src/com/google/refine/importers/tree/XmlImportUtilities.java
@@ -47,8 +47,6 @@ import javax.servlet.ServletException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import com.fasterxml.jackson.core.JsonParseException;
-
 import com.google.refine.importers.tree.TreeReader.Token;
 import com.google.refine.model.Cell;
 import com.google.refine.model.Project;
diff --git a/main/src/com/google/refine/importing/DefaultImportingController.java b/main/src/com/google/refine/importing/DefaultImportingController.java
index b3af00f16..a11812169 100644
--- a/main/src/com/google/refine/importing/DefaultImportingController.java
+++ b/main/src/com/google/refine/importing/DefaultImportingController.java
@@ -47,7 +47,6 @@ import javax.servlet.http.HttpServletResponse;
 
 import com.fasterxml.jackson.annotation.JsonProperty;
 import com.fasterxml.jackson.core.JsonGenerator;
-import com.fasterxml.jackson.core.JsonParseException;
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.refine.RefineServlet;