Camel Rest DSL : property placeholder no longer works - apache-camel

Question

I am currently migrating my applications from Spring Boot 1.5.19..RELEASE and Camel 2.18.3 to Spring Boot 2.1.4.RELEASE and Camel 2.23.1
For REST DSL, Camel property placeholder no longer seems to work and I am forced to go back to Spring placeholders.
I would like to point out, because it may not be clear, that the code works in the third case
// SB. 1.5.19, camel 2.18.3 --> WORKS
private void configureRestServices() {
rest("{{rest.path.human-resources-codes}}")
.consumes(APPLICATION_JSON)
...
.to("{{uri.human-resources-codes.put}}");
// SB. 2.1.4, camel 2.23.1 --> DOESN'T WORK
private void configureRestServices() {
rest("{{rest.path.human-resources-codes}}")
.consumes(APPLICATION_JSON)
...
.to("{{uri.human-resources-codes.put}}");
// SB. 2.1.4, camel 2.23.1 --> WORKS
#Value(value = "${rest.path.human-resources-codes}")
private String REST_ENDPOINT_HUMAN_RESOURCES_CODES;
private void configureRestServices() {
rest(REST_ENDPOINT_HUMAN_RESOURCES_CODES)
.consumes(APPLICATION_JSON)
...
.to("{{uri.human-resources-codes.put}}"); // this one still works.
EDIT
Positive matches:
-----------------
ConfigServiceBootstrapConfiguration#configServicePropertySource matched:
- #ConditionalOnProperty (spring.cloud.config.enabled) matched (OnPropertyCondition)
- #ConditionalOnMissingBean (types: org.springframework.cloud.config.client.ConfigServicePropertySourceLocator; SearchStrategy: all) did not find any beans (OnBeanCondition)
ConfigurationPropertiesRebinderAutoConfiguration matched:
- #ConditionalOnBean (types: org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor; SearchStrategy: all) found bean 'org.springframework.boot.context.properties.ConfigurationPropertiesBindingPostProcessor' (OnBeanCondition)
ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesBeans matched:
- #ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesBeans; SearchStrategy: current) did not find any beans (OnBeanCondition)
ConfigurationPropertiesRebinderAutoConfiguration#configurationPropertiesRebinder matched:
- #ConditionalOnMissingBean (types: org.springframework.cloud.context.properties.ConfigurationPropertiesRebinder; SearchStrategy: current) did not find any beans (OnBeanCondition)
EncryptionBootstrapConfiguration matched:
- #ConditionalOnClass found required class 'org.springframework.security.crypto.encrypt.TextEncryptor' (OnClassCondition)
PropertyPlaceholderAutoConfiguration#propertySourcesPlaceholderConfigurer matched:
- #ConditionalOnMissingBean (types: org.springframework.context.support.PropertySourcesPlaceholderConfigurer; SearchStrategy: current) did not find any beans (OnBeanCondition)
EDIT (2)
Caused by: java.lang.IllegalArgumentException: PropertiesComponent with name properties must be defined in CamelContext to support property placeholders.
Property with key [rest.path.human-resources-codes] not found in properties from text: {{{rest.path.human-resources-codes}}}
at org.apache.camel.component.properties.DefaultPropertiesParser$ParsingContext.getPropertyValue(DefaultPropertiesParser.java:271) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.component.properties.DefaultPropertiesParser$ParsingContext.readProperty(DefaultPropertiesParser.java:157) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.component.properties.DefaultPropertiesParser$ParsingContext.doParse(DefaultPropertiesParser.java:116) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.component.properties.DefaultPropertiesParser$ParsingContext.parse(DefaultPropertiesParser.java:100) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.component.properties.DefaultPropertiesParser.parseUri(DefaultPropertiesParser.java:63) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.component.properties.PropertiesComponent.parseUri(PropertiesComponent.java:235) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.component.properties.PropertiesComponent.parseUri(PropertiesComponent.java:178) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.impl.DefaultCamelContext.resolvePropertyPlaceholders(DefaultCamelContext.java:2547) ~[camel-core-2.23.1.jar:2.23.1]
at org.apache.camel.model.rest.RestDefinition.addRouteDefinition(RestDefinition.java:959) ~[camel-core-2.23.1.jar:2.23.1]