I have Spring Boot application.
I need to generate LocalDateTime.now value in application properties.
I think there should be function like ${random.int} which generates random value
Related
I have a Spring Boot application, using Intellij, and am trying to use the #Value annotation in order to get an environment variable from my application.properties.
My application.properties looks like this
server.port=27019
web.entrance.id=63d284ec
Using debugger, I can see that the value of entranceId is successfully retrieved from application.properties, but the same variable is always null in the String.format and my WebUrl has the string 'null' in it and I don't understand why.
#RestController
public class Controller {
#Value(("${entrance.id}"))
private String entranceId;
String WebUrl = String.format("http://localhost:27019/%s", entranceId);
Can someone explain if there is some detail I'm missing why this happens?
Thank you
Your thinking is wrong. Spring will process the #Value after the object has been constructed, whereas your field is being initialized as soon as the class is being constructed (so during constructing).
Basically what Spring does
new Controller()
Detect #Value and with reflection set value
Any construction callbacks (like #PostConstruct).
Your field is being filled at step 1 not after step 2. At which point the #Value hasn't yet been processed.
If you want to set the value you need to do that in an #PostConstruct method or use constructor injection to construct the URL.
You are using the Pageable object provided by Spring, and you need to display this object through swagger. I am using Custom Annotation.
I want to change the size value of #ApiImplicitParam according to the ApiPageable Annotation variable.
Please refer to the picture below.
I am developing an app where there will be a properties file for each type of database.
I want to load the properties file corresponding to the database based on the driver available in classpath using spring boot custom auto configuration and put it in a common holder object as a map.
For example, lets say I have oracle driver on classpath, So i need to load oracle-metadata.properties and place it in map with key as "oracle" and value as the properties object.
Current Approach
#ConfigurationProperties
#PropertySource("classpath:oracle-metadata.properties")
public class OracleMetadataConfiguration{
//if i have the object attributes corresponding to properties file, i will end up having duplicate attributes for each type of database
}
Application.properties
org.springframework.boot.autoconfigure.EnableAutoConfiguration=\
com.**.autoconfiguration.OracleMetadataConfiguration
How do i use the different instance representation for same configuration object structure?
What is the best way to design this?
I have properties file in Spring Boot application , with end points mentioned as below :-
user.details = /api/{userID}/get-user
I am using POJO with #PropertySource, #Configuration to read values.
Now my requirement is to replace the userID value dynamically from the java code after reading it from properties file, when I receive the ID from front end application. I will not pass this value from command line as it does not serve my use case.
I have some code to load a value as such in my Spring application:
#Component
public class MyElasticRestService {
#Value("${elasticApi.baseURL}")
private String elasticApiBaseUrl;
According to the Spring docs, I should be able to use a relaxed binding that comes from an uppercase environment variable such as ELASTIC_API_BASE_URL or ELASTICAPI_BASEURL. But I'm confused which is correct. Both don't seem to work so I am wondering how to debug what is actually picked up.
I've loaded Spring Boot Actuator to view the configprops endpoint. But it doesn't have anything on the elasticApi prefix.
What should the correct environment variable be and how can I see how it gets translated and picked up by the application?
The #Value annotation doesn't support relaxed bindings. Therefore you could use a class annotated with #ConfigurationProperties or you use a RelaxedPropertyResolver to get the value from the environment.
According to https://docs.spring.io/spring-boot/docs/current/reference/html/spring-boot-features.html#boot-features-external-config-vs-value, it is now very possible simply with #Value as long as you use kebab-case (all lower case with dash) for the name e.g. #Value("config.refresh-rate")
Instead of trying to make it an UPPER_SNAKE_CASE, you can put it in your application.yaml file, this way:
elasticApi.baseURL: ${ELASTIC_API_BASE_URL:defaultvalue}
or this way doesn't really matter:
elasticApi:
baseURL: ${ELASTIC_API_BASE_URL:defaultvalue}