nicolaferraro opened a new issue #631:
URL: https://github.com/apache/camel-k-runtime/issues/631
Opening it here to discuss it better, but maybe now it's also a core Camel
concern.
I need to define a Kamelet with an optional parameter, so;
```yaml
# ...
spec:
definition:
properties:
clientId: # this is optional, no default value
type: string
flow:
from:
uri: paho:the-topic
parameters:
clientId: "{{clientId}}"
brokerUrl: "the-url"
```
This is how I'd define such Kamelet.
If I don't set any value for `clientId`, the operator does not pass any
value in application properties for `camel.kamelet.mqtt-source.clientId`.
But, even if the clientId is not marked as required, the route template
engine fails with:
```
2021-02-16 09:02:59,624 ERROR [io.qua.run.Application] (main) Failed to
start application (with profile prod): java.lang.IllegalArgumentException:
Route template mqtt-source the following mandatory parameters must be provided:
clientId
at
org.apache.camel.quarkus.core.BaseModel.addRouteFromTemplate(BaseModel.java:225)
at
org.apache.camel.quarkus.core.FastCamelContext.addRouteFromTemplate(FastCamelContext.java:199)
at
org.apache.camel.component.kamelet.KameletComponent$LifecycleHandler.createRouteForEndpoint(KameletComponent.java:370)
at
org.apache.camel.component.kamelet.KameletComponent$LifecycleHandler.onContextInitialized(KameletComponent.java:339)
at
org.apache.camel.impl.engine.AbstractCamelContext.doInit(AbstractCamelContext.java:2646)
at
org.apache.camel.quarkus.core.FastCamelContext.doInit(FastCamelContext.java:505)
at
org.apache.camel.support.service.BaseService.init(BaseService.java:83)
at
org.apache.camel.impl.engine.AbstractCamelContext.init(AbstractCamelContext.java:2414)
at
org.apache.camel.support.service.BaseService.start(BaseService.java:111)
at
org.apache.camel.impl.engine.AbstractCamelContext.start(AbstractCamelContext.java:2431)
at org.apache.camel.quarkus.main.CamelMain.doStart(CamelMain.java:75)
at
org.apache.camel.support.service.BaseService.start(BaseService.java:115)
at
org.apache.camel.quarkus.main.CamelMain.startEngine(CamelMain.java:120)
at
org.apache.camel.quarkus.main.CamelMainRuntime.start(CamelMainRuntime.java:49)
at
org.apache.camel.quarkus.core.CamelBootstrapRecorder.start(CamelBootstrapRecorder.java:45)
at
io.quarkus.deployment.steps.CamelBootstrapProcessor$boot-173480958.deploy_0(CamelBootstrapProcessor$boot-173480958.zig:101)
at
io.quarkus.deployment.steps.CamelBootstrapProcessor$boot-173480958.deploy(CamelBootstrapProcessor$boot-173480958.zig:40)
at io.quarkus.runner.ApplicationImpl.doStart(ApplicationImpl.zig:534)
at io.quarkus.runtime.Application.start(Application.java:90)
at
io.quarkus.runtime.ApplicationLifecycleManager.run(ApplicationLifecycleManager.java:97)
at io.quarkus.runtime.Quarkus.run(Quarkus.java:62)
at io.quarkus.runtime.Quarkus.run(Quarkus.java:38)
at io.quarkus.runtime.Quarkus.run(Quarkus.java:104)
at io.quarkus.runner.GeneratedMain.main(GeneratedMain.zig:29)
```
A related problem is to ensure that once the issue is fixed, the `clientId`
in the `paho` endpoint is not passed at all (i.e. not passed as "" empty
string).
cc: @lburgazzoli
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