Errors you'll see if a RestTemplate isn't defined
Consider defining a bean of type 'org.springframework.web.client.RestTemplate' in your configuration.
or
No qualifying bean of type [org.springframework.web.client.RestTemplate] found
How to define a RestTemplate via annotations
Depending on which technologies you're using and what versions will influence how you define a RestTemplate in your @Configuration class.
Spring >= 4 without Spring Boot
Simply define an @Bean:
@Bean
public RestTemplate restTemplate() {
return new RestTemplate();
}
Spring Boot <= 1.3
No need to define one, Spring Boot automatically defines one for you.
Spring Boot >= 1.4
Spring Boot no longer automatically defines a RestTemplate but instead defines a RestTemplateBuilder allowing you more control over the RestTemplate that gets created. You can inject the RestTemplateBuilder as an argument in your @Bean method to create a RestTemplate:
@Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) {
// Do any additional configuration here
return builder.build();
}
Using it in your class
@Autowired
private RestTemplate restTemplate;
or
@Inject
private RestTemplate restTemplate;
A similar progression, as Mixermachine reported, happened while updating versions to address some IQ Server security violations caught by our scans.
I had to run from the command line to get the details ==> mvn spring-boot:run , because the app simply would not start from the IDE.
Same thing, first it complained about the @bean in my Controller's code, as circular reference. Then it suggested initialize it in the @configuration class,
This happened when upgrading from SpringBoot 2.5.6 to 2.7.1