[WIP] Upgrade ONOS to karaf version 4.2.1

Change-Id: I7cd40c995bdf1c80f94b1895fb3344e32404c7fa
diff --git a/web/gui/src/main/java/org/onosproject/ui/impl/topo/cli/UiClearMetaCommand.java b/web/gui/src/main/java/org/onosproject/ui/impl/topo/cli/UiClearMetaCommand.java
index ecbd82a..22b096a 100644
--- a/web/gui/src/main/java/org/onosproject/ui/impl/topo/cli/UiClearMetaCommand.java
+++ b/web/gui/src/main/java/org/onosproject/ui/impl/topo/cli/UiClearMetaCommand.java
@@ -17,7 +17,7 @@
 
 package org.onosproject.ui.impl.topo.cli;
 
-import org.apache.karaf.shell.commands.Command;
+import org.apache.karaf.shell.api.action.Command;
 import org.onosproject.cli.AbstractShellCommand;
 import org.onosproject.ui.impl.TopologyViewMessageHandlerBase;
 
@@ -29,7 +29,7 @@
 public class UiClearMetaCommand extends AbstractShellCommand {
 
     @Override
-    protected void execute() {
+    protected void doExecute() {
         TopologyViewMessageHandlerBase.clearMetaUi();
     }
 }