补充出错信息

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@447 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/filter/FilterManager.java

@@ -23,10 +23,14 @@ import java.util.Map;
 import java.util.Properties;
 import java.util.concurrent.ConcurrentHashMap;
 
+import com.alibaba.druid.logging.Log;
+import com.alibaba.druid.logging.LogFactory;
 import com.alibaba.druid.util.JdbcUtils;
 
 public class FilterManager {
 
+    private final static Log                               LOG      = LogFactory.getLog(FilterManager.class);
+
     private static final ConcurrentHashMap<String, String> aliasMap = new ConcurrentHashMap<String, String>();
 
     static {
@@ -39,8 +43,8 @@ public class FilterManager {
                     aliasMap.put(name, (String) entry.getValue());
                 }
             }
-        } catch (IOException e) {
-            e.printStackTrace();
+        } catch (Exception e) {
+            LOG.error("load filter config error", e);
         }
     }