spring-data-geode and spring-boot-starter-webflux application run failed - spring-webflux

Question

I have a webflux project and I am adding apache geode. In my build.gradle I have:
implementation 'org.springframework.data:spring-data-geode:2.2.4.RELEASE'
implementation 'org.springframework.boot:spring-boot-starter-webflux:2.2.4.RELEASE'
Once adding the spring-data-geode implementation the application crashes with:
2020-01-28T16:29:51,965 INFO [main] org.eclip.jetty.util.log.Log 169 initialized: Logging initialized #4337ms to org.eclipse.jetty.util.log.Slf4jLog
2020-01-28T16:29:52,050 WARN [main] org.sprin.conte.suppo.AbstractApplicationContext 558 refresh: Exception encountered during context initialization - cancelling refresh attempt: org.springframework.context.ApplicationContextException: Unable to start reactive web server; nested exception is java.lang.NoClassDefFoundError: org/eclipse/jetty/servlet/ServletHolder
2020-01-28T16:29:52,064 INFO [main] org.sprin.boot.autoc.loggi.ConditionEvaluationReportLoggingListener 136 logMessage:
Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-01-28T16:29:52,072 ERROR [main] org.sprin.boot.SpringApplication 826 reportFailure: Application run failed
org.springframework.context.ApplicationContextException: Unable to start reactive web server; nested exception is java.lang.NoClassDefFoundError: org/eclipse/jetty/servlet/ServletHolder
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.onRefresh(ReactiveWebServerApplicationContext.java:81)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:544)
at org.springframework.boot.web.reactive.context.ReactiveWebServerApplicationContext.refresh(ReactiveWebServerApplicationContext.java:66)
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747)
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215)
The trouble is, if I add
spring.main.web-application-type=none or spring.main.web-application-type=reactive to my application.properties then that interferes with the #ClientCacheApplication(name = "Web", locators = #Locator(host="1.2.3.4", port=10334), logLevel = "debug", subscriptionEnabled = true) annotation and the application does not connect to the geode locator, nor then run the #EnableClusterDefinedRegions which causes problems defining simple regions that I want to pick up from the server.
UPDATE To add spring-boot-starter-web to build.gradle and make the spring boot application type NONE as below appears to fix the instant problem, but...
SpringApplication app = new SpringApplication(Web.class);
app.setWebApplicationType(WebApplicationType.NONE);
SpringApplication.run(Web.class, args);
... but then the webflux mapping cannot find the #Bean websocket handler:
2020-01-28T16:54:26,236 DEBUG [http-nio-8082-exec-2] org.sprin.web.servl.handl.AbstractHandlerMapping 412 getHandler: Mapped to ResourceHttpRequestHandler ["classpath:/META-INF/resources/", "classpath:/resources/", "classpath:/static/", "classpath:/public/", "/"]
2020-01-28T16:54:26,246 DEBUG [http-nio-8082-exec-2] org.sprin.web.servl.resou.ResourceHttpRequestHandler 454 handleRequest: Resource not found
2020-01-28T16:54:26,246 DEBUG [http-nio-8082-exec-2] org.sprin.web.servl.FrameworkServlet 1131 logResult: Completed 404 NOT_FOUND
and this causes the website to error:
The console log says
WebSocket connection to 'ws://localhost:8082/ws/data' failed: Error during WebSocket handshake: Unexpected response code: 404

Answer 1

The problems with regions was because the classes using the regions defined by #EnableClusterDefinedRegions were (a) instantiated by new command rather than Spring #Autowired; and (b) in another package not seen by the Spring Boot #ComponentScan. Once these were fixed then the regions were auto-defined and handled using #Resource annotation.
#Resource(name = "Example") private Region<Object, Object> example
Also the main program was given
SpringApplication app = new SpringApplication(Web.class);
app.setWebApplicationType(WebApplicationType.REACTIVE);
SpringApplication.run(Web.class, args);
The other problem was fixed by getting the correct dependencies in the build.gradle and then annotating endpoints for rSocket / webSocket with:
#MessageMapping(value = "helloWorld")
public Flux<String> getFluxSocket() {
log.traceEntry();
log.info("In hello world");
return Flux.just("{\"Hello\":\"World\"}");
}
or
#GetMapping(value = "/helloWorld", produces = MediaType.TEXT_EVENT_STREAM_VALUE)
public Flux<String> getRestSocket() {
log.traceEntry();
return Flux.just("Hello World");
}
for HTTP endpoints.