Spring Add native-image support for RestTemplateBuilder

When using RestTemplateBuilder in a native-image, for example in this code:

private final RestTemplateBuilder restTemplateBuilder;

// ...

RestTemplate restTemplate = this.restTemplateBuilder
  .setConnectTimeout(Duration.ofSeconds(5))
  .setReadTimeout(Duration.ofSeconds(5))
  .build();

then this fails in a native image with this stacktrace:

java.lang.IllegalStateException: Request factory class org.springframework.http.client.SimpleClientHttpRequestFactory does not have a suitable setConnectTimeout method
    at org.springframework.boot.web.client.RestTemplateBuilder$RequestFactoryCustomizer.findMethod(RestTemplateBuilder.java:782)
    at org.springframework.boot.web.client.RestTemplateBuilder$RequestFactoryCustomizer.setConnectTimeout(RestTemplateBuilder.java:761)
    at org.springframework.boot.web.client.RestTemplateBuilder$RequestFactoryCustomizer.accept(RestTemplateBuilder.java:736)
    at org.springframework.boot.web.client.RestTemplateBuilder.buildRequestFactory(RestTemplateBuilder.java:656)
    at org.springframework.boot.web.client.RestTemplateBuilder.configure(RestTemplateBuilder.java:614)
    at org.springframework.boot.web.client.RestTemplateBuilder.build(RestTemplateBuilder.java:589)
    at com.example.resttemplate.CLR.http(CLR.java:33)
    at com.example.resttemplate.CLR.run(CLR.java:26)
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:768)
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:752)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at com.example.resttemplate.RestTemplateApplication.main(RestTemplateApplication.java:13)

This can be observed in https://ci.spring.io/teams/spring-aot-smoke-tests/pipelines/spring-aot-smoke-tests-1.0.x/jobs/rest-template/builds/1

Comment From: mhalbritter

Ah, sorry, this is a boot issue.