[Q/A][Java SDK (Component)]Dubbo version 2.7.13 how to get context in dubbo

[Guo-Chenxu]

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Apache Dubbo Component

Java SDK (apache/dubbo)

Details

i want to use sse with dubbo, and now i want to get the HttpServletResponse in from dubbo, and i have got a method from the doc

my code is the same as the above.

my code:

 HttpServletResponse response;
        if (RpcContext.getContext().getResponse() != null) {
            response = RpcContext.getContext().getResponse(HttpServletResponse.class);
        }

But unfortunately, in practical operation, i failed.

Firstly, i run with the following config:

dubbo:
  protocol:
    name: dubbo
    port: -1

But i get null from RpcContext.getContext().getResponse().

Then, i find the protocol in doc is rest, so i changed my config, but it run failed:

dubbo:
  protocol:
    name: rest
    port: -1
    server: tomcat

(server=servlet has the same error)

the errors are as follows:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'coolController' defined in file [D:\JavaWork\hotel-backend\server\target\classes\com\hotel\server\controller\CoolController.class]: Initialization of bean failed; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ServiceBean:com.hotel.common.service.server.CoolService': Cannot resolve reference to bean 'coolServiceImpl' while setting bean property 'ref'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'coolServiceImpl': Injection of @DubboReference dependencies is failed; nested exception is java.lang.NoClassDefFoundError: org/jboss/resteasy/plugins/server/servlet/HttpServletDispatcher
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:602) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:897) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:879) ~[spring-context-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:551) ~[spring-context-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:755) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:747) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:402) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:312) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1247) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1236) [spring-boot-2.3.12.RELEASE.jar:2.3.12.RELEASE]
	at com.hotel.server.ServerApplication.main(ServerApplication.java:29) [classes/:na]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ServiceBean:com.hotel.common.service.server.CoolService': Cannot resolve reference to bean 'coolServiceImpl' while setting bean property 'ref'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'coolServiceImpl': Injection of @DubboReference dependencies is failed; nested exception is java.lang.NoClassDefFoundError: org/jboss/resteasy/plugins/server/servlet/HttpServletDispatcher
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:342) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:113) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1702) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1447) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:207) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1115) ~[spring-context-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.getServiceBean(ReferenceAnnotationBeanPostProcessor.java:343) ~[dubbo-2.7.18.jar:2.7.18]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.exportServiceBeanIfNecessary(ReferenceAnnotationBeanPostProcessor.java:335) ~[dubbo-2.7.18.jar:2.7.18]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.prepareReferenceBean(ReferenceAnnotationBeanPostProcessor.java:328) ~[dubbo-2.7.18.jar:2.7.18]
	at org.apache.dubbo.config.spring.beans.factory.annotation.ReferenceAnnotationBeanPostProcessor.doGetInjectedBean(ReferenceAnnotationBeanPostProcessor.java:159) ~[dubbo-2.7.18.jar:2.7.18]
	at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.getInjectedObject(AbstractAnnotationBeanPostProcessor.java:409) ~[spring-context-support-1.0.11.jar:na]
	at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor$AnnotatedFieldElement.inject(AbstractAnnotationBeanPostProcessor.java:626) ~[spring-context-support-1.0.11.jar:na]
	at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:179) ~[spring-context-support-1.0.11.jar:na]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1430) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	... 16 common frames omitted
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'coolServiceImpl': Injection of @DubboReference dependencies is failed; nested exception is java.lang.NoClassDefFoundError: org/jboss/resteasy/plugins/server/servlet/HttpServletDispatcher
	at com.alibaba.spring.beans.factory.annotation.AbstractAnnotationBeanPostProcessor.postProcessPropertyValues(AbstractAnnotationBeanPostProcessor.java:183) ~[spring-context-support-1.0.11.jar:na]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1430) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:593) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:516) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:324) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:322) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:330) ~[spring-beans-5.2.21.RELEASE.jar:5.2.21.RELEASE]
	... 36 common frames omitted

it seems that it needs a HttpServletDispatcher, but i dont know how to config that (in the doc, there seem to be a web.xml config, but i dont know how to write that), can anyone help me? or is there any other method to use sse with dubbo?

THANKS!

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[AlbumenJ]

@suncairong163 @oxsean PTAL

[AlbumenJ]

I would recommand you to try on 3.3.x

[Guo-Chenxu]

thank you for your suggestion, i have aborted this method and use websocket to implement. i will try your method next time.