Getting connection timed out error in Java microservice - spring

Question

I have built a microservice using Java 8 and SpringBoot 2. From this microservice, I'm trying to consume another REST API service. However, I'm getting the following error on Chrome
java.lang.IllegalStateException: The underlying HTTP client completed
without emitting a response.
2018-06-12 15:21:29.300 ERROR 17996 --- [ctor-http-nio-3]
.a.w.r.e.DefaultErrorWebExceptionHandler : Failed to handle request
[GET http://localhost:8080/category/search]
io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection
timed out: no further information: test.usdemo.xyz.com/92.54.41.24:443
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_171]
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717)
~[na:1.8.0_171]
at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:325)
~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:340)
~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:497)
~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:459)
~[netty-transport-4.1.24.Final.jar:4.1.24.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$5.run(SingleThreadEventExecutor.java:884)
~[netty-common-4.1.24.Final.jar:4.1.24.Final]
at java.lang.Thread.run(Thread.java:748) ~[na:1.8.0_171] Caused by: java.net.ConnectException: Connection timed
out: no further information
... 10 common frames omitted
I'm able to consume the same service successfully using PostMan but not through my microservice.
Please assist to advise on this.

Answer 1

I do not know how to edit my own question above as I do not see the edit option hence I'm adding the additional details here to get the resolution of my query.
Controller class:-
#RestController
public class CategorySearchController {
private final CategorySearchService categorySearchService;
#Autowired
public CategorySearchController(CategorySearchService categorySearchService) {
this.categorySearchService = categorySearchService;
}
#GetMapping(path = "/search-category")
public Mono<CategoryResponse> searchCategories(SearchRequest categorySearchRequest){
return categorySearchService
.searchCategories()
.switchIfEmpty(Mono.error(
new EntityNotFoundException("No category matching " + categorySearchRequest.getSearchTerm() + " was found")));
}
}
Service class:-
#Service
public class CategorySearchServiceImpl implements CategorySearchService {
private String baseUrl = "https://demo0954903.mockable.io";
#Override
public Mono<CategoryResponse> searchCategories() {
WebClient webClient = WebClient.create(baseUrl);
return webClient.
get()
.uri("/category-search")
.retrieve()
.bodyToMono(CategoryResponse.class);
}
}

Answer 2

I found the solution for this issue. I need to add the proxy in the webclient as follows:-
private final WebClient webClient;
ReactorClientHttpConnector connector = new ReactorClientHttpConnector(
options -> options.httpProxy(addressSpec -> {
return addressSpec.host(PROXY_HOST).port(PROXY_PORT);
}));
this.webClient = webClientBuilder.baseUrl(BASE_URL).clientConnector(connector).build();

Answer 3

Check your proxy settings. In Spring applications, you can add the following to the VM arguments to set your proxy: -Dhttp.proxyHost=your.proxy.net -Dhttp.proxyPort=8080

Answer 4

I met a similar issue on a scala project. According to the error message, I found IntelliJ took Ant as the compiler which I was expected sbt as the compiler.
Solve the issue by turn on sbt shell use for builds option (Preferences > Build, Execution, Deployment > Build Tools > sbt > sbt projects > sbt shell > check builds )
Executing pre-compile tasks...
Loading Ant configuration...
Running Ant tasks...
Abnormal build process termination:
{remove some sensitive logs here}
io.netty.channel.AbstractChannel$AnnotatedConnectException: Operation timed out: /127.0.0.1:50154
Caused by: java.net.ConnectException: Operation timed out
at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method)
at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:716)
at io.netty.channel.socket.nio.NioSocketChannel.doFinishConnect(NioSocketChannel.java:330)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:334)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:707)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:655) at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:581)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.lang.Thread.run(Thread.java:748)
Exiting.
Executing post-compile tasks...
Loading Ant configuration...
Running Ant tasks...
Synchronizing output directories...
2021/9/15, 8:52 AM - Build completed with 1 error and 0 warnings in 27 sec, 726 ms