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

    https://github.com/apache/brooklyn-ui/pull/34#discussion_r81372539
  
    --- Diff: src/main/webapp/assets/js/view/application-add-wizard.js ---
    @@ -680,10 +680,12 @@ define([
                     this.$('.required-config-loading').hide()
                     if (catalogEntryItem!=null && 
catalogEntryItem.config!=null) {
                         var that = this
    -                    _.each(catalogEntryItem.config, function (cfg) {
    -                        if (cfg.priority !== undefined) {
    +                    _.chain(catalogEntryItem.config).sortBy(function (cfg){
    +                        return !isNaN(cfg.priority) ? cfg.priority : 99999;
    +                    }).each(function (cfg) {
    +                        if (cfg.pinned === true || 
(cfg.contraints.indexOf('required') > -1 && typeof cfg.defaultValue === 
'string' && cfg.defaultValue === '')) {
    --- End diff --
    
    Agree, that's my point.
    `defaultValue == null` on the server side is serialized as missing 
(`undefined`) on the wire.
    Which means that `cfg.contraints.indexOf('required') > -1 && typeof 
cfg.defaultValue === 'string' && cfg.defaultValue === ''` will be `false` for 
`undefined`. So it will not be shown, even if required.


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