I’m using Spring Boot 3 (3.3.1) and Java 21.
When using the new RestClient I encountered two problems:
-
the onStatus(…) method does not work if error 408 (timeoutexception) occurs. And as a result, I cannot handle this exception in onStatus.
-
How can I override response when processing error statuses in the onStatus(…) method so that the further .body(…) method can process the result? (For example, returning a null object rather than throwing an org.springframework.web.client.ResourceAccessException error)
As an example, I created a small test case on GitHub (here is a link to it):
Server:
-Here I simply created a controller with one endpoint, which simply waits 5 seconds and returns the string “Hello World”:
@GetMapping("/exception")
public String exception() throws InterruptedException {
log.info("let's wait a little");
Thread.sleep(5000);
log.info("We waited. Now let's return the result");
return "Hello World";
}
Client:
I defined a RestClient bean in which I configured the connect=2 sec and read=1 sec timeouts:
@Bean
public RestClient restClient(RestClient.Builder builder) {
return builder
.baseUrl("https://localhost:8082")
.requestFactory(requestFactory())
.build();
}
private ClientHttpRequestFactory requestFactory() {
ClientHttpRequestFactorySettings requestFactorySettings = ClientHttpRequestFactorySettings.DEFAULTS
.withConnectTimeout(Duration.ofSeconds(2))
.withReadTimeout(Duration.ofSeconds(1));
return new BufferingClientHttpRequestFactory(ClientHttpRequestFactories.get(requestFactorySettings));
}
Then from a simple controller I call the service method, in which I make a request to the server:
@GetMapping("/check")
public String check() {
return simpleService.sayHelloFromServer();
}
Service:
public class SimpleService {
private final RestClient restClient;
public String sayHelloFromServer() {
return restClient.get()
.uri(uriBuilder -> uriBuilder.path("/exception").build())
.retrieve()
.onStatus(HttpStatusCode::isError, (request, response) -> log.error("handle error [{}]", response.getStatusCode()))
.body(String.class);
}
}
But as I see in the logs, the onStatus(…) method does not work. Because the retrieve() method throws an exception.
This can be seen in the logs:
2024-07-22T11:51:06.217+02:00 DEBUG 12612 --- [client] [nio-8081-exec-3] o.s.web.servlet.DispatcherServlet : Failed to complete request: org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost:8082/exception": Read timed out
2024-07-22T11:51:06.218+02:00 ERROR 12612 --- [client] [nio-8081-exec-3] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed: org.springframework.web.client.ResourceAccessException: I/O error on GET request for "http://localhost:8082/exception": Read timed out] with root cause
java.net.SocketTimeoutException: Read timed out
at java.base/sun.nio.ch.NioSocketImpl.timedRead(NioSocketImpl.java:278) ~[na:na]
at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:304) ~[na:na]
at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:346) ~[na:na]
at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:796) ~[na:na]
at java.base/java.net.Socket$SocketInputStream.read(Socket.java:1099) ~[na:na]
at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:291) ~[na:na]
at java.base/java.io.BufferedInputStream.read1(BufferedInputStream.java:347) ~[na:na]
at java.base/java.io.BufferedInputStream.implRead(BufferedInputStream.java:420) ~[na:na]
at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:399) ~[na:na]
at java.base/sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:827) ~[na:na]
at java.base/sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:759) ~[na:na]
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1690) ~[na:na]
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1599) ~[na:na]
at java.base/java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:531) ~[na:na]
at org.springframework.http.client.SimpleClientHttpRequest.executeInternal(SimpleClientHttpRequest.java:88) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.http.client.AbstractStreamingClientHttpRequest.executeInternal(AbstractStreamingClientHttpRequest.java:70) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:66) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.http.client.BufferingClientHttpRequestWrapper.executeInternal(BufferingClientHttpRequestWrapper.java:77) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.http.client.AbstractBufferingClientHttpRequest.executeInternal(AbstractBufferingClientHttpRequest.java:48) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.http.client.AbstractClientHttpRequest.execute(AbstractClientHttpRequest.java:66) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.exchangeInternal(DefaultRestClient.java:492) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.web.client.DefaultRestClient$DefaultRequestBodyUriSpec.retrieve(DefaultRestClient.java:460) ~[spring-web-6.1.11.jar:6.1.11]
at by.gvu.client.service.SimpleService.sayHelloFromServer(SimpleService.java:18) ~[main/:na]
at by.gvu.client.controller.SimpleController.check(SimpleController.java:15) ~[main/:na]
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[na:na]
at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[na:na]
at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:255) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:188) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:118) ~[spring-webmvc-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:926) ~[spring-webmvc-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:831) ~[spring-webmvc-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1089) ~[spring-webmvc-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:979) ~[spring-webmvc-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1014) ~[spring-webmvc-6.1.11.jar:6.1.11]
at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:903) ~[spring-webmvc-6.1.11.jar:6.1.11]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:885) ~[spring-webmvc-6.1.11.jar:6.1.11]
at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:195) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51) ~[tomcat-embed-websocket-10.1.26.jar:10.1.26]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.11.jar:6.1.11]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.11.jar:6.1.11]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.1.11.jar:6.1.11]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.1.11.jar:6.1.11]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:389) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:904) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.26.jar:10.1.26]
at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]
2024-07-22T11:51:06.234+02:00 DEBUG 12612 --- [client] [nio-8081-exec-3] o.s.web.servlet.DispatcherServlet : "ERROR" dispatch for GET "/error", parameters={}