#Value annotation unable to read properties file in spring boot camel application - spring-boot

Question

I have a spring-boot application where I read data from queue and send data to transformation class using .bean()
Integration.java
class Integration {
#Value("${someURL}")
private String someURL; //able to read someURL from property file
from("queue")
// some intermediate code
.bean(new TransformationClass(), "transformationMethod")
// other code
}
Now, Inside TransformationClass I have #Value annotation to read values from properties file but it always returns a null.
TransformationClass.java
#Component
class TransformationClass {
#Value("${someURL}")
private String someURL; //someURL return null though there is key-value associated in props file.
public void transformationMethod(Exchange exchange) {
// other stuff related to someURL
}
}
Note - I am able to read values from property file in class Integration.java but unable to read from class TransformationClass.java
I am using spring boot version - 2.7.2 and camel version - 3.18.1 jdk - 17
I tried to read using camel PropertiesComponent but it did not worked.

Answer 1

Problem here is, that new TransformationClass() is not a "spring managed instance", thus all #Autowire/Value/Inject/...s have no effect.
Since TransformationClass is (singleton, spring-managed) #Component and is needed by Integration, wiring these makes sense:
Via field... :
class Integration {
#Autowired
private TransformationClass trnsObject;
// ...
Or constructor injection:
class Integration {
private final TransformationClass trnsObject;
public Integration(/*im- /explicitely #Autowired*/ TransformationClass pTrnsObject) {
trnsObject = pTrnsObject;
}
// ...
// then:
doSomethingWith(trnsObject); // has correct #Values
}