SpringBoot将RestTemplateBuilder从1.5.14升级到2.1.5

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I have this piece of code working fine on a project that uses RestTemplateBuilder 1.5.14

this.restTemplate = restTemplateBuilder
                .setConnectTimeout(connectTimeout)
                .setReadTimeout(readTimeout)
                .requestFactory(new MyHttpComponentFactoryBuilder()
                        .build())
                .build();

After updating to RestTemplateBuilder 2.1.5 I have this piece of code:

this.restTemplate = restTemplateBuilder
                .setConnectTimeout(Duration.ofMillis(connectTimeout))
                .setReadTimeout(Duration.ofMillis(readTimeout))
                .requestFactory(new MyHttpComponentFactoryBuilder().build().getClass())
                .build();

but when running the code I have a InvocationTargetException / NullPointerException that dissapears when deleting the line .requestFactory(new MyHttpComponentFactoryBuilder().build().getClass()) , but debugging new MyHttpComponentFactoryBuilder().build().getClass() is not null