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List<Contentlet> maxGroupID  = null;
Long nextGroupID = null;

String groupIDPlus1 = "+structureInode:"+importStructureGroup.getInode()+" +locked:false +live:true";
maxGroupID = conAPI.search(groupIDPlus1, 0, -1, "integer2", PublicUserFactory.getSystemUser(), true);
if(maxGroupID.size()<1)
{
        nextGroupID = 1;
} else {
        for(Contentlet con : maxGroupID)
        {
                nextGroupID = con.getLongProperty("groupid");
        }
        nextGroupID++;
}