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Add native-image support for RestTemplateBuilder

See original GitHub issue

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

Issue Analytics

State:
Created a year ago
Comments:5 (4 by maintainers)

Top GitHub Comments

1reaction

mhalbrittercommented, Aug 1, 2022

I decided to not refactor the reflection away and went for the RuntimeHints way instead. I made ClientHttpRequestFactorySupplier more native-friendly by introducting _PRESENT constants.

0reactions

snicollcommented, Nov 15, 2022

Good catch @akefirad, I’ve created #33203