I have config the spring cloud gateway hystrix as below:
default-filters:
- name: Hystrix
args:
name: defaultGatewayCommand
fallbackUri: forward:/hystrix-fallback
The problem is, for example, when I throw ResponseStatusException exception in my project, the hystrix fallback will be triggered.
#GetMapping("/hystrix-fallback")
public Mono<ApiErrorResponse> hystrixFallback() {
return Mono.just(new ApiErrorResponse("xxxxxxxx"));
}
I want to catch some error info and build my new ApiErrorResponse, but i don 't how to do it?
#GetMapping("/hystrix-fallback")
public Mono hystrixFallback(ServerWebExchange exchange) {
Exception exception = exchange.getAttribute(ServerWebExchangeUtils.HYSTRIX_EXECUTION_EXCEPTION_ATTR);
return Mono.just(new ApiErrorResponse("xxxxxxxx"));
}
Related
I have a Spring Cloud Gateway (eureka client) app that uses Spring Cloud Load Balancer (Spring Cloud version: Hoxton.SR6) and I have an instance of a spring boot app (spring boot 2.3 with enabled graceful shutdown, (eureka client).
When I shutdown a spring boot service and perform a request through the gateway then the gateway throws 500 error (connection refused), instead of 503. 503 appears after a 1-2 minutes.
Can anyone clarify if it is an expected behavior?
It seems that the problem comes from eureka-client (1.9.21 version in my case)
AtomicReference<Applications> localRegionApps isn't frequently updated
Thanks!
UPDATE:
I decided to check deeper this 500 error. The result is that my system (ubuntu) gives this error if the port is not used:
curl -v localhost:9722
Rebuilt URL to: localhost:9722/
Trying 127.0.0.1...
TCP_NODELAY set
connect to 127.0.0.1 port 9722 failed: Connection refused
Failed to connect to localhost port 9722: Connection refused
Closing connection 0
So I put in my application.yml:
spring:
cloud:
gateway:
routes:
- id: my_route
uri: http://localhost:9722/
Then when my request is routed to my_route and none of apps uses 9722 then I get an error:
io.netty.channel.AbstractChannel$AnnotatedConnectException: finishConnect(..) failed: Connection refused: localhost/127.0.0.1:9722
Suppressed: reactor.core.publisher.FluxOnAssembly$OnAssemblyException:
Error has been observed at the following site(s):
|_ checkpoint ⇢ org.springframework.cloud.gateway.filter.WeightCalculatorWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ org.springframework.boot.actuate.metrics.web.reactive.server.MetricsWebFilter [DefaultWebFilterChain]
|_ checkpoint ⇢ HTTP GET "/internal/mail/internal/health-check" [ExceptionHandlingWebHandler]
Stack trace:
Caused by: java.net.ConnectException: finishConnect(..) failed: Connection refused
at io.netty.channel.unix.Errors.throwConnectException(Errors.java:124)
at io.netty.channel.unix.Socket.finishConnect(Socket.java:251)
at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.doFinishConnect(AbstractEpollChannel.java:672)
at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.finishConnect(AbstractEpollChannel.java:649)
at io.netty.channel.epoll.AbstractEpollChannel$AbstractEpollUnsafe.epollOutReady(AbstractEpollChannel.java:529)
at io.netty.channel.epoll.EpollEventLoop.processReady(EpollEventLoop.java:465)
at io.netty.channel.epoll.EpollEventLoop.run(EpollEventLoop.java:378)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:834)
It seems to be an unexpected exception, since it isn't possible to handle it using a circuit breaker or any gateway filter.
Is it possible to handle this error correctly? I would like to return 503 in this case
One of the easiest ways to map particular exception to particular HTTP status code is providing a custom bean of type org.springframework.boot.web.reactive.error.ErrorAttributes. Here is an example:
#Bean
public ErrorAttributes errorAttributes() {
return new CustomErrorAttributes(httpStatusExceptionTypeMapper);
}
public class CustomErrorAttributes extends DefaultErrorAttributes {
#Override
public Map<String, Object> getErrorAttributes(ServerRequest request, ErrorAttributeOptions options) {
Map<String, Object> attributes = super.getErrorAttributes(request, options);
Throwable error = getError(request);
MergedAnnotation<ResponseStatus> responseStatusAnnotation = MergedAnnotations
.from(error.getClass(), MergedAnnotations.SearchStrategy.TYPE_HIERARCHY).get(ResponseStatus.class);
HttpStatus errorStatus = determineHttpStatus(error, responseStatusAnnotation);
attributes.put("status", errorStatus.value());
return attributes;
}
private HttpStatus determineHttpStatus(Throwable error, MergedAnnotation<ResponseStatus> responseStatusAnnotation) {
if (error instanceof ResponseStatusException) {
return ((ResponseStatusException) error).getStatus();
}
return responseStatusAnnotation.getValue("code", HttpStatus.class).orElseGet(() -> {
if (error instanceof java.net.ConnectException) {
return HttpStatus.SERVICE_UNAVAILABLE;
}
return HttpStatus.INTERNAL_SERVER_ERROR;
}
}
}
hava a try to define your custom ErrorWebExceptionHandler.
see:
org.springframework.boot.web.reactive.error.ErrorWebExceptionHandler
org.springframework.boot.autoconfigure.web.reactive.error.DefaultErrorWebExceptionHandler
You should use Cloud Circuit Breaker.
For that:
Declare corresponding starter in your pom:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-circuitbreaker-reactor-resilience4j</artifactId>
</dependency>
Declare circuit breaker in application.yaml
spring:
cloud:
gateway:
routes:
- id: my_route
uri: http://localhost:9722/
filters:
- name: CircuitBreaker
args:
name: myCircuitBreaker
fallbackUri: forward:/inCaseOfFailureUseThis
Declare the endpoint which will be called in the case of failure (a connection error, for example)
#RequestMapping("/inCaseOfFailureUseThis")
public Mono<ResponseEntity<String>> inCaseOfFailureUseThis() {
return Mono.just(ResponseEntity.status(HttpStatus.SERVICE_UNAVAILABLE).body("body for service failure case"));
}
I am trying to setup an integration test env for debezium integration (following the instructions in this example) but the test container (default image: confluentinc/cp-kafka:5.2.1) doesn't start but throws an exception.
I am using below mentioned code to create a KafkaContainer bean
#Bean
public KafkaContainer kafkaContainer() {
if (kafkaContainer == null) {
kafkaContainer = new KafkaContainer()
.withNetwork(network())
.withExternalZookeeper("172.17.0.2:2181");
kafkaContainer.start();
}
}
return kafkaContainer;
}
it throws following exception.
***************************
APPLICATION FAILED TO START
***************************
Description:
An attempt was made to call a method that does not exist. The attempt was made from the following location:
org.testcontainers.containers.KafkaContainer.getBootstrapServers(KafkaContainer.java:91)
The following method did not exist:
org/testcontainers/containers/KafkaContainer.getHost()Ljava/lang/String;
The method's class, org.testcontainers.containers.KafkaContainer, is available from the following locations:
jar:file:/home/shubham/.m2/repository/org/testcontainers/kafka/1.14.3/kafka-1.14.3.jar!/org/testcontainers/containers/KafkaContainer.class
The class hierarchy was loaded from the following locations:
org.testcontainers.containers.KafkaContainer: file:/home/shubham/.m2/repository/org/testcontainers/kafka/1.14.3/kafka-1.14.3.jar
org.testcontainers.containers.GenericContainer: file:/home/shubham/.m2/repository/org/testcontainers/testcontainers/1.12.5/testcontainers-1.12.5.jar
org.testcontainers.containers.FailureDetectingExternalResource: file:/home/shubham/.m2/repository/org/testcontainers/testcontainers/1.12.5/testcontainers-1.12.5.jar
Action:
Correct the classpath of your application so that it contains a single, compatible version of org.testcontainers.containers.KafkaContainer
2020-09-10 01:09:49.937 ERROR 72507 --- [ main] o.s.test.context.TestContextManager : Caught exception while allowing TestExecutionListener
Used an older version of org.testcontainers in maven dependencies and it worked. Thanks!
I'm using Spring Cloud gateway and trying to use the circuit breaker. In the gateway I have added a fallback(failover-service) method for the service(cricketer-service) in the gateway(cricketer-gateway).
The failover service works fine individually. Failover service is named as cricketer-failover-service in application.properties.
Gateway config
#Configuration
public class RoutesConfig {
#Bean
public RouteLocator routes(RouteLocatorBuilder builder) {
return builder.routes()
.route(r -> r.path("/cricketers*")
.filters(f -> f.circuitBreaker(c -> c.setName("cricketerFb")
.setFallbackUri("forward:/cricketer-failover")
.setRouteId("cricketer-failover")
))
.uri("lb://cricketer-service")
.id("cricketer-service"))
.route(r -> r.path("/cricketer-failover*")
.uri("lb://cricketer-failover-service")
.id("cricketer-failover-service"))
.build();
}
When I turn the service off and then hit the endpoint, I receive an exception
2020-08-30 14:17:28.670 ERROR 14766 --- [or-http-epoll-3] com.netflix.hystrix.AbstractCommand : Unrecoverable Error for HystrixCommand so will throw HystrixRuntimeException and not apply fallback.
java.lang.Exception: Throwable caught while executing.
at com.netflix.hystrix.AbstractCommand.getExceptionFromThrowable(AbstractCommand.java:1976) ~[hystrix-core-1.5.18.jar:1.5.18]
Stacktrace - https://gist.github.com/nirmalks/4adb8b64955625df6b5a22469f106bfe
Code - https://github.com/nirmalks/cricketer-microservice/tree/hystrix-fallback-err
Im trying to connect to Kafka with JMS. I followed this guide to use the Payara Kafka Connector. This worked on Wildfly. But I cant get it to work on OpenLiberty.
The server.xml:
<resourceAdapter id="kafkajmsra" location="${shared.resource.dir}kafka-rar-0.5.0.rar"/>
<jmsTopicConnectionFactory jndiName="JMSTopicFactory">
<properties.kafkajmsra
bootstrapServerConfig="kafka:9092"/>
</jmsTopicConnectionFactory>
<jmsTopic id="kafkaTopic" jndiName="JmsTopic">
<properties.kafkajmsra topicName="demoTopic" />
</jmsTopic>
With those configurations I get a NullPointerException if I try to inject those components. The JNDI names can be found but not with these parameters.
#Resource(lookup = "JMSTopicFactory")
private TopicConnectionFactory jmsTopicFactory;
#Resource(lookup = "JMSTopic")
private Topic jmsTopic;
Am I missing something in the server.xml?
I tried using the default JMS Connector. It does connect to Kafka, but the connection gets refused and on the kafka side it tells me this:
[2020-05-31 20:05:27,134] WARN [SocketServer brokerId=1] Unexpected error from /172.20.0.4; closing connection (org.apache.kafka.common.network.Selector)
org.apache.kafka.common.network.InvalidReceiveException: Invalid receive (size = -1091633152)
at org.apache.kafka.common.network.NetworkReceive.readFrom(NetworkReceive.java:103)
at org.apache.kafka.common.network.KafkaChannel.receive(KafkaChannel.java:448)
at org.apache.kafka.common.network.KafkaChannel.read(KafkaChannel.java:398)
at org.apache.kafka.common.network.Selector.attemptRead(Selector.java:678)
at org.apache.kafka.common.network.Selector.pollSelectionKeys(Selector.java:580)
at org.apache.kafka.common.network.Selector.poll(Selector.java:485)
at kafka.network.Processor.poll(SocketServer.scala:893)
at kafka.network.Processor.run(SocketServer.scala:792)
at java.lang.Thread.run(Thread.java:748)
EDIT:
I changed the server.xml to look like this now:
<resourceAdapter id="kafkajmsra" location="${shared.resource.dir}/kafka-rar-0.4.0.rar"/>
<connectionFactory jndi="java:app/KafkaConnectionFactory"
interfaceName="fish.payara.cloud.connectors.kafka.api.KafkaConnectionFactory"
resourceAdapter="liberty/wlp/usr/shared/resources/kafka-rar-0.4.0.rar">
</connectionFactory>
and the java code looks like this:
#ApplicationScoped
public class TopicProducer {
private static final Logger LOG = LoggerFactory.getLogger(TopicProducer.class);
public TopicProducer() throws Exception {
LOG.info("Starting TopicProducer");
}
#Resource(lookup = "java:app/KafkaConnectionFactory")
KafkaConnectionFactory kafkaConnectionFactory;
public void send(final String msg) {
try (KafkaConnection connection = kafkaConnectionFactory.createConnection()) {
LOG.info("Send message: {}", msg);
connection.send(new ProducerRecord("demoTopic", msg));
} catch (Exception e) {
LOG.error(e.getMessage(), e);
}
}
}
But now I get a NullPointerException on the #Resource. My guess is that the resource adapter cannot be found.
Is it possible to lookup and use UserTransaction from a remote-client as
in AS 4?
I followed this document and connected from outside the server: Remote EJB invocations via JNDI - EJB client API or remote-naming project - WildFly 8 - Project Documentation Editor.
Here is the code that I used in AS 4, which failed in WildFly
Eg:
public void beginTransaction() {
try {
ut = (UserTransaction) getCtx().lookup("UserTransaction");
ut.begin();
} catch (Exception ex) {
throw new RuntimeException("Failed to begin UserTransactiion", ex);
}
}
Then I got this error:
Caused by: javax.naming.NameNotFoundException: UserTransaction -- service jboss.naming.context.java.jboss.exported.UserTransaction
Thanks!
It's now deprecated. Better use:
UserTransaction ut = RemoteTransactionContext.getInstance().getUserTransaction();