Regression from SpringBoot 3.2.2 Factory method 'webClientHttpConnector' threw exception with message: Cannot reserve 49152 bytes of direct buffer memory (allocated: 10452747, limit: 10485760) about reactor-netty

[violetagg]

@KafkaProServerless Please provide a reproducible example.

[KafkaProServerless]

Thank you @violetagg for the answer.

The project is quite big.
While I am removing things, may I ask if there are anything I can try to pin down the issue?

Change some memory limit? Enable debug log? remove some dependencies?

[violetagg]

@KafkaProServerless Your project uses a lot of third party libraries because of this we need a reproducible example. From Reactor Netty point of view there is nothing that comes to my mind as a change that can cause this - https://github.com/reactor/reactor-netty/releases/tag/v1.1.15

[violetagg]

May be try to change the used Reactor BOM - instead of 2023.0.2, try 2023.0.1

[KafkaProServerless]

trying

[KafkaProServerless]

Hey @violetagg ,

Again, thank you for looking into this.

Our team is working on this issue, and we believe to have more clues.

With below code, issue is reproducible 100%

 @Bean
    public WebClient getWebClient(final WebClient.Builder builder, final SslContext sslContext) {
        final var clientHttpConnector = new ReactorClientHttpConnector(HttpClient.create().wiretap(true).metrics(true, Function.identity()).protocol(HttpProtocol.HTTP11).secure(sslContextSpec -> sslContextSpec.sslContext(sslContext).handshakeTimeout(Duration.ofMinutes(1L)).closeNotifyFlushTimeout(Duration.ofMinutes(1L)).closeNotifyReadTimeout(Duration.ofMinutes(1L))));
        return builder.baseUrl(hostAndPort).defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE).clientConnector(clientHttpConnector).build();
    }

While strangely, with this code, it is working!

 @Bean
    public WebClient getWebClient(final SslContext sslContext) {
        final var clientHttpConnector = new ReactorClientHttpConnector(HttpClient.create().wiretap(true).metrics(true, Function.identity()).protocol(HttpProtocol.HTTP11).secure(sslContextSpec -> sslContextSpec.sslContext(sslContext).handshakeTimeout(Duration.ofMinutes(1L)).closeNotifyFlushTimeout(Duration.ofMinutes(1L)).closeNotifyReadTimeout(Duration.ofMinutes(1L))));
        return WebClient.builder().baseUrl(hostAndPort).defaultHeader(HttpHeaders.CONTENT_TYPE, MediaType.APPLICATION_JSON_VALUE).clientConnector(clientHttpConnector).build();
    }

Therefore, I think there is an issue with this final WebClient.Builder builder

It seems to correlate with log:

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.web.reactive.function.client.WebClient$Builder]: Factory method 'webClientBuilder' threw exception with message: Error creating bean with name 'webClientHttpConnectorCustomizer' defined in class path resource [org/springframework/boot/autoconfigure/web/reactive/function/client/ClientHttpConnectorAutoConfiguration.class]: Unsatisfied dependency expressed through method 'webClientHttpConnectorCustomizer' parameter 0: Error creating bean with name 'webClientHttpConnector' defined in class path resource [org/springframework/boot/autoconfigure/web/reactive/function/client/ClientHttpConnectorAutoConfiguration.class]: Failed to instantiate [org.springframework.http.client.reactive.ClientHttpConnector]: Factory method 'webClientHttpConnector' threw exception with message: Cannot reserve 49152 bytes of direct buffer memory (allocated: 10452747, limit: 10485760)

May I ask if you know if there can be any regression caused by final WebClient.Builder builder?

[violetagg]

May I ask if you know if there can be any regression caused by final WebClient.Builder builder?

Please contact Spring Framework maintainers

[KafkaProServerless]

Understood, thank you