tarilabs opened a new issue, #3986:
URL: https://github.com/apache/camel-k/issues/3986
Hi,
I have a Kamelet definition as:
```yaml
apiVersion: camel.apache.org/v1alpha1
kind: Kamelet
metadata:
name: kdtable
labels:
camel.apache.org/kamelet.type: "action"
spec:
definition:
title: "Kamelet decision table with YaRD"
description: |-
Experimental Kamelet processor supporting (only) YaRD's decision table.
required:
- kdtable
properties:
kdtable:
title: kdtable
description: the YaRD's decision table element
type: object
expressionLang:
title: expressionLang
description: can be blank
type: string
default: "null" # <--- unable to use `null` in this kamelet
definition
resultKey:
title: resultKey
description: can be blank
type: string
default: kdtable
dependencies:
- ...
template:
beans:
- name: mmbean
type: '#class:org.drools.yard.kdtable.KdtableProcessor'
properties:
kdtable: '{{kdtable}}'
expressionLang: '{{expressionLang}}'
resultKey: '{{resultKey}}'
from:
uri: "kamelet:source"
...
```
For the Processor, defined as a bean in the template on suggestion from
@lburgazzoli , `expressionLang` is optional.
However, despite it's not in the `spec.definition.required` of the Kamelet
definition as a required property, I still need to assign it a `default:
<something>` which cannot be null, empty, etc.
- I've tried `default: null` and the Integration _at runtime_ complain the
expressionLang property is not defined.
- I've tried `default: ""` same thing.
I think I was able to get it to be null by using in the _KameletBinding_
something ~like:
```yaml
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1alpha1
name: kdtable
properties:
expressionLang: null
kdtable: ...
```
but this is not really what I want, I would like the user to ~"ignore"
expressionLang in the end-user definition, so that the processor can establish
some default when non-supplied.
So currently I have it as:
```yaml
expressionLang:
title: expressionLang
description: can be blank
type: string
default: "null" # unable to use `null` in this kamelet definition
```
and then in my Processor I have to:
```java
public class KdtableProcessor implements Processor {
private Object kdtable;
private String expressionLang;
private String resultKey = "kdtable";
public void setKdtable(Object kdtable) {
if (expressionLang != null && !expressionLang.isEmpty() &&
!expressionLang.equals("null")) {
yard.setExpressionLang(expressionLang);
} else {
yard.setExpressionLang(null);
}
// ...
```
which is very far from ideal, since I have to exclude the hard-coded
`"null"` string as a null-value semantic.
Q1. is it pragmatically possible to define a non-required property, given
the above report, please?
Q2. is it possible in a Processor to be notified _all the properties_ have
been set --not at `process(Exchange exchange)` runtime, I mean at Processor
instantiation for the bean/registry/context before the route building, please?
Thanks in advance 🙏
/cc @valdar @danielezonca
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