Index: common/src/main/java/org/glassfish/admingui/common/handlers/LoggingHandlers.java
===================================================================
--- common/src/main/java/org/glassfish/admingui/common/handlers/LoggingHandlers.java	(revision 52337)
+++ common/src/main/java/org/glassfish/admingui/common/handlers/LoggingHandlers.java	(working copy)
@@ -132,12 +132,18 @@
         String config = (String)handlerCtx.getInputValue("config");
         Map<String, Object> props = new HashMap();
         try{
+            StringBuilder sb = new StringBuilder();
+            String sep = "";
             for(Map<String, Object> oneRow : allRows){
-                props.put("id", oneRow.get("loggerName") + "=" + oneRow.get("level"));
-                props.put("target", config);
-                RestUtil.restRequest((String)GuiUtil.getSessionValue("REST_URL") + "/set-log-levels.json",
+                if ( !GuiUtil.isEmpty((String) oneRow.get("loggerName"))){
+                    sb.append(sep).append(oneRow.get("loggerName")).append("=").append(oneRow.get("level"));
+                    sep=":";
+                }
+            }
+            props.put("id", sb.toString());
+            props.put("target", config);
+            RestUtil.restRequest((String)GuiUtil.getSessionValue("REST_URL") + "/set-log-levels.json",
                     props, "POST", null, false, true);
-            }
             // after saving logger levels remove the deleted loggers
             deleteLoggers(allRows, config);
         }catch(Exception ex){
@@ -160,15 +166,20 @@
             newLoggers.add((String)oneRow.get("loggerName"));
         }
         // delete the removed loggers
-        attrs = new HashMap();
+        StringBuilder sb = new StringBuilder();
+        String sep = "";
         for (String logger : oldLoggers) {
             if (!newLoggers.contains(logger)) {
-                attrs.put("id", logger);
-                attrs.put("target", configName);
-                RestUtil.restRequest((String)GuiUtil.getSessionValue("REST_URL") + "/delete-log-levels",
-                    attrs, "POST", null, false);
+                sb.append(sep).append(logger);
+                sep=":";
             }
         }
+        if (sb.length() > 0){
+            attrs = new HashMap();
+            attrs.put("id", sb.toString());
+            attrs.put("target", configName);
+            RestUtil.restRequest((String)GuiUtil.getSessionValue("REST_URL") + "/delete-log-levels", attrs, "POST", null, false);
+        }
     }
     
     @Handler(id = "saveLoggingAttributes",