Server Sent Events with Spring Boot and WebFlux - spring-boot

Question

I am working on Server Sent Events. I took help from
http://sinhamohit.com/writing/spring-boot-reactive-sse
https://github.com/mohitsinha/spring-boot-reactive-sse
The issue with the above example is everything is defined in one class. I am trying to do it different classes but it fails with exception:
2018-08-20 17:03:15.521 WARN 10964 --- [ main]
onfigReactiveWebServerApplicationContext : Exception encountered during
context initialization - cancelling refresh attempt:
org.springframework.context.ApplicationContextException: Unable to start
reactive web server; nested exception is
org.springframework.context.ApplicationContextException: Unable to start
ReactiveWebApplicationContext due to missing ReactiveWebServerFactory bean.
2018-08-20 17:03:15.599 ERROR 10964 --- [ main]
o.s.boot.SpringApplication : Application run failed
org.springframework.context.ApplicationContextException: Unable to start
reactive web server; nested exception is
org.springframework.context.ApplicationContextException: Unable to start
ReactiveWebApplicationContext due to missing ReactiveWebServerFactory bean.
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.onRefresh(ReactiveWebServerApplicationContext.java:76) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544) ~[spring-context-5.0.8.RELEASE.jar:5.0.8.RELEASE]
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:61) ~[spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:762) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:398) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:330) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1258) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1246) [spring-boot-2.0.4.RELEASE.jar:2.0.4.RELEASE]
at hello.SpringBootApplication.main(SpringBootApplication.java:8) [classes/:na]
Code:
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.4.RELEASE</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-webflux</artifactId>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
</dependencies>
#RestController
#RequestMapping("/stock/transaction")
public class StockTransactionController {
#Autowired
StockTransactionService stockTransactionService;
#GetMapping(produces = MediaType.APPLICATION_STREAM_JSON_VALUE)
public Flux<StockTransaction> stockTransactionEvents() {
return stockTransactionService.getStockTransactions();
}
}
#Service
public class StockTransactionService {
List<Stock> stockList = new ArrayList<>();
List<String> stockNames =
Arrays.asList("mango,banana,guava,infinity".split(","));
#Bean
CommandLineRunner commandLineRunner() {
return args -> {
createRandomStock();
stockList.forEach(System.out::println);
};
}
public Flux<StockTransaction> getStockTransactions() {
Flux<Long> interval = Flux.interval(Duration.ofSeconds(1));
interval.subscribe((i) -> stockList.forEach(stock ->
stock.setPrice(changePrice(stock.getPrice()))));
Flux<StockTransaction> stockTransactionFlux = Flux
.fromStream(Stream.generate(() -> new
StockTransaction(getRandomUser(), getRandomStock(), new Date())));
return Flux.zip(interval, stockTransactionFlux).map(Tuple2::getT2);
}
}
Please help.

Answer 1

The problem was with annotation. #SpringBootApplication