Github user rafaelweingartner commented on a diff in the pull request:

    https://github.com/apache/cloudstack/pull/1878#discussion_r105676576
  
    --- Diff: engine/schema/src/com/cloud/vm/dao/NicDaoImpl.java ---
    @@ -302,4 +309,17 @@ public int countNicsForStartingVms(long networkId) {
             List<Integer> results = customSearch(sc, null);
             return results.get(0);
         }
    +
    +    @Override
    +    public Long getPeerRouterId(String publicMacAddress, final long 
routerId) {
    +        final SearchCriteria<NicVO> sc = PeerRouterSearch.create();
    +        sc.setParameters("instanceId", routerId);
    +        sc.setParameters("macAddress", publicMacAddress);
    +        sc.setParameters("vmType", VirtualMachine.Type.DomainRouter);
    +        NicVO nicVo = findOneBy(sc);
    +        if (nicVo != null) {
    +            return (new Long(nicVo.getInstanceId()));
    --- End diff --
    
    Let the auto-boxing and auto-unboxing do this for you.
    When you do this manually the pool of String/numbers of java will not be 
used.
    You just need to return `nicVo.getInstanceId()`


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