Croway opened a new pull request, #22406:
URL: https://github.com/apache/camel/pull/22406
## Summary
When a Pipe YAML uses `{{placeholder}}` in Kamelet source/sink properties,
the curly braces are URL-encoded to `%7B%7B...%7D%7D` by
`URISupport.createQueryString()`, preventing Camel's property placeholder
resolver from recognizing them.
**Reproducer:**
```yaml
apiVersion: camel.apache.org/v1
kind: Pipe
metadata:
name: placeholder-bug
spec:
source:
ref:
kind: Kamelet
apiVersion: camel.apache.org/v1
name: timer-source
properties:
message: "{{my.message}}"
sink:
uri: "log:result"
```
```bash
camel run pipe.yaml --prop=my.message="Hello Camel"
# Expected: logs "Hello Camel"
# Actual: logs "%7B%7Bmy.message%7D%7D"
```
**Root cause:** `extractCamelEndpointUri()` in `YamlRoutesBuilderLoader`
calls `URISupport.createQueryString(params)` which URL-encodes `{{` to `%7B%7B`
and `}}` to `%7D%7D`. The encoding itself is correct and necessary for special
characters, but property placeholder double-braces must be preserved.
**Fix:** After creating the query string, restore `%7B%7B` → `{{` and
`%7D%7D` → `}}` so Camel's property placeholder resolver can find them.
Jira: https://issues.apache.org/jira/browse/CAMEL-23284
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