Have a look at the last message in this thread:

https://groups.google.com/forum/m/?utm_medium=email&utm_source=footer#!msg/jenkinsci-dev/TgNiBeYEgz4/J658JsMGJv4J
On Jul 15, 2015 7:12 PM, "Felipe Wannmacher" <[email protected]> wrote:

> How can I do that? The instance is present, but how can I assure the
> presence of the descriptor?
>
> Em quarta-feira, 15 de julho de 2015 13:27:29 UTC-3, Ivo Bellin Salarin
> escreveu:
>>
>> In your jelly, you must be sure that the descriptor and instance
>> variables are present.
>> On Jul 15, 2015 4:46 PM, "Felipe Wannmacher" <[email protected]> wrote:
>>
>>> I'm trying to use something like this:
>>>
>>>
>>> public ListBoxModel doFillGoalTypeItems() {
>>>     ListBoxModel items = new ListBoxModel();
>>>
>>>     for (BuildGoal goal : getBuildGoals()) {
>>>         items.add(goal.getDisplayName(), goal.getId());
>>>     }
>>>
>>>     return items;
>>> }
>>> <f:entry field="goalType" title="Choose Goal Type">
>>>     <f:select />
>>> </f:entry>
>>>
>>> That sample works perfectly in a configuration section, but the select
>>> is not filled when used in a RootAction. All I get is the following error:
>>>
>>>
>>> POST http://localhost:8080/jenkins/my-plugin/null 404 (Not Found)
>>>
>>> No matching rule was found on <com.my.plugin.MyRootAction@1aa70942> for
>>>> "/null"
>>>>
>>>
>>> I've already tried the doFillXyzItems method either inside or outside
>>> the descriptor and nothing seems to help.
>>>
>>> Any ideas?
>>>
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