Remove printStackTrace where possible.

Removed printStackTrace if logger was available.

Change-Id: I4cfa99ccceacce5fa78ecf50b1139b2e306bb45e
diff --git a/src/main/java/net/onrc/onos/core/flowprogrammer/FlowSynchronizer.java b/src/main/java/net/onrc/onos/core/flowprogrammer/FlowSynchronizer.java
index b0de5bf..af3cc70 100644
--- a/src/main/java/net/onrc/onos/core/flowprogrammer/FlowSynchronizer.java
+++ b/src/main/java/net/onrc/onos/core/flowprogrammer/FlowSynchronizer.java
@@ -223,16 +223,13 @@
                 Future<List<OFStatistics>> dfuture = sw.getStatistics(req);
                 entries = dfuture.get();
             } catch (IOException e) {
-                // TODO Auto-generated catch block
-                e.printStackTrace();
+                log.error("Error getting statistics", e);
                 return null;
             } catch (InterruptedException e) {
-                // TODO Auto-generated catch block
-                e.printStackTrace();
+                log.error("Error getting statistics", e);
                 return null;
             } catch (ExecutionException e) {
-                // TODO Auto-generated catch block
-                e.printStackTrace();
+                log.error("Error getting statistics", e);
                 return null;
             }