Spring boot 整合Dubbo

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Spring boot 整合Dubbo

Spring boot 整合Dubbo

环境
- Spring boot：1.5.3.RELEASE
- zookeeper：3.4.10
- dubbo：2.5.3

-              +----------------+              |dubbo-interface |              +----------------+                       |                       |         +------++------+------++------+        |                             |        |                             |           +----------------+             +----------------+| dubbo-provider |             | dubbo-comsumer |+----------------+             +----------------+

dubbo-interface：定义接口
dubbo-provider：提供服务
dubbo-cosumer：消费服务

1、接口定义代码

package com.hhly.dubbo.service;public interface HelloProvider {    public String sayHello(String name);}

2、服务提供者

2.1、服务提供者配置类

package com.hhly.dubbo.config;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;import com.alibaba.dubbo.config.ApplicationConfig;import com.alibaba.dubbo.config.ProtocolConfig;import com.alibaba.dubbo.config.ProviderConfig;import com.alibaba.dubbo.config.RegistryConfig;import com.alibaba.dubbo.config.spring.AnnotationBean;import com.alibaba.dubbo.rpc.Exporter;@Configuration@ConditionalOnClass(Exporter.class)@PropertySource(value = "classpath:/dubbo.properties")public class DubboConfiguration {    @Value("${dubbo.application.name}")    private String applicationName;    @Value("${dubbo.registr.protocol}")    private String protocol;    @Value("${dubbo.registry.address}")    private String registryAddress;    @Value("${dubbo.protocol.name}")    private String protocolName;    @Value("${dubbo.protocol.port}")    private int protocolPort;    @Value("${dubbo.provider.timeout}")    private int timeout;    @Value("${dubbo.provider.retries}")    private int retries;    @Value("${dubbo.provider.delay}")    private int delay;    /**     * 设置dubbo扫描包     *      * @param packageName     * @return     */    @Bean    public static AnnotationBean annotationBean(@Value("${dubbo.annotation.package}") String packageName) {        AnnotationBean annotationBean = new AnnotationBean();        annotationBean.setPackage(packageName);        return annotationBean;    }    /**     * 注入dubbo上下文     *      * @return     */    @Bean    public ApplicationConfig applicationConfig() {        // 当前应用配置        ApplicationConfig applicationConfig = new ApplicationConfig();        applicationConfig.setName(this.applicationName);        return applicationConfig;    }    /**     * 注入dubbo注册中心配置,基于zookeeper     *      * @return     */    @Bean    public RegistryConfig registryConfig() {        // 连接注册中心配置        RegistryConfig registry = new RegistryConfig();        registry.setProtocol(protocol);        registry.setAddress(registryAddress);        return registry;    }    /**     * 默认基于dubbo协议提供服务     *      * @return     */    @Bean    public ProtocolConfig protocolConfig() {        // 服务提供者协议配置        ProtocolConfig protocolConfig = new ProtocolConfig();        protocolConfig.setName(protocolName);        protocolConfig.setPort(protocolPort);        protocolConfig.setThreads(200);        //System.out.println("默认protocolConfig：" + protocolConfig.hashCode());        return protocolConfig;    }    /**     * dubbo服务提供     *      * @param applicationConfig     * @param registryConfig     * @param protocolConfig     * @return     */    @Bean(name = "myProvider")    public ProviderConfig providerConfig(ApplicationConfig applicationConfig, RegistryConfig registryConfig,            ProtocolConfig protocolConfig) {        ProviderConfig providerConfig = new ProviderConfig();        providerConfig.setTimeout(timeout);        providerConfig.setRetries(retries);        providerConfig.setDelay(delay);        providerConfig.setApplication(applicationConfig);        providerConfig.setRegistry(registryConfig);        providerConfig.setProtocol(protocolConfig);        return providerConfig;    }    // getter/setter}

2.2、服务提供者实现接口提供者接口

package com.hhly.dubbo.service;import org.springframework.stereotype.Component;import com.alibaba.dubbo.config.annotation.Service;@Component@Service(version="1.0.0")public class HelloProviderImpl implements HelloProvider {    @Override    public String sayHello(String name) {        return "hello dubbo-" + name;    }}

2.3、配置文件

# 当前应用名称，用于注册中心计算应用间依赖关系，## 注意：消费者和提供者应用名不要一样，此参数不是匹配条件，## 你当前项目叫什么名字就填什么，# 和提供者消费者角色无关，比如：kylin应用调用了morgan应用的服务，则kylin项目配成kylin，# morgan项目配成morgan，可能kylin也提供其它服务给别人使用，但kylin项目永远配成kylin，# 这样注册中心将显示kylin依赖于morgan dubbo.application.name=application_provider# 日志输出方式，可选：slf4j,jcl,log4j,jdk dubbo.application.logger=slf4j# 扫描注解包路径，多个包用逗号分隔，不填pacakge表示扫描当前ApplicationContext中所有的类dubbo.annotation.package=com.hhly.dubbo.service# 服务端口dubbo.protocol.name=dubbo# 协议端口dubbo.protocol.port=20880# 设为true，将向logger中输出访问日志，# 也可填写访问日志文件路径，直接把访问日志输出到指定文件 dubbo.protocol.accessLog=true# 服务方法调用超时时间(毫秒) dubbo.provider.timeout=3000# 远程服务调用重试次数，不包括第一次调用，不需要重试请设为0 dubbo.provider.retries=1# 延迟注册服务时间(毫秒)- ，设为-1时，表示延迟到Spring容器初始化完成时暴露服务dubbo.provider.delay=-1# 只调用指定协议的服务提供方，其它协议忽略。 dubbo.registr.protocol=zookeeper# 注册地址dubbo.registry.address=192.168.10.242:2181# 该协议的服务是否注册到注册中心 dubbo.registry.register=true# 是否向此注册中心订阅服务，如果设为false，将只注册，不订阅 dubbo.registry.subscribe=true

3、服务消费者代码

3.1、服务消费者配置类

package com.hhly.dubbo.config;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Configuration;import org.springframework.context.annotation.PropertySource;import com.alibaba.dubbo.config.ApplicationConfig;import com.alibaba.dubbo.config.ConsumerConfig;import com.alibaba.dubbo.config.RegistryConfig;import com.alibaba.dubbo.config.spring.AnnotationBean;import com.alibaba.dubbo.rpc.Invoker;@Configuration@ConditionalOnClass(Invoker.class)@PropertySource(value = "classpath:/dubbo.properties")public class DubboConfiguration {    @Value("${dubbo.application.name}")    private String applicationName;    @Value("${dubbo.registr.protocol}")    private String protocol;    @Value("${dubbo.registry.address}")    private String registryAddress;    @Value("${dubbo.protocol.name}")    private String protocolName;    @Value("${dubbo.protocol.port}")    private int protocolPort;    @Value("${dubbo.provider.timeout}")    private int timeout;    /**     * 设置dubbo扫描包     * @param packageName     * @return     */    @Bean    public static AnnotationBean annotationBean(@Value("${dubbo.annotation.package}") String packageName) {        AnnotationBean annotationBean = new AnnotationBean();        annotationBean.setPackage(packageName);        return annotationBean;    }    /**     * 注入dubbo上下文     *      * @return     */    @Bean    public ApplicationConfig applicationConfig() {        // 当前应用配置        ApplicationConfig applicationConfig = new ApplicationConfig();        applicationConfig.setName(this.applicationName);        return applicationConfig;    }    /**     * 注入dubbo注册中心配置,基于zookeeper     *      * @return     */    @Bean    public RegistryConfig registryConfig() {        // 连接注册中心配置        RegistryConfig registry = new RegistryConfig();        registry.setProtocol(protocol);        registry.setAddress(registryAddress);        return registry;    }    /**     * 默认基于dubbo协议提供服务     *      * @return     *//*    @Bean    public ProtocolConfig protocolConfig() {        // 服务提供者协议配置        ProtocolConfig protocolConfig = new ProtocolConfig();        protocolConfig.setName(protocolName);        protocolConfig.setPort(protocolPort);        protocolConfig.setThreads(200);        System.out.println("默认protocolConfig：" + protocolConfig.hashCode());        return protocolConfig;    }*/    /**     * dubbo消费     *      * @param applicationConfig     * @param registryConfig     * @param protocolConfig     * @return     */    @Bean(name="defaultConsumer")    public ConsumerConfig providerConfig(ApplicationConfig applicationConfig, RegistryConfig registryConfig) {        ConsumerConfig providerConfig = new ConsumerConfig();        return providerConfig;    }    // getter/setter}

3.2、消费者服务调用类

package com.hhly.dubbo.service.impl;import org.springframework.stereotype.Component;import com.alibaba.dubbo.config.annotation.Reference;import com.hhly.dubbo.service.HelloProvider;import com.hhly.dubbo.service.HelloService;@Componentpublic class HelloServiceImpl implements HelloService{    @Reference(version = "1.0.0")    private HelloProvider helloService;    public String sayHello(String name) {        String sayHello = helloService.sayHello(name);        return sayHello;    }}

3.3、配置文件

修改

dubbo.application.name=application_comsumer

需要注意一点，所定义的dubbo注解类是在dubbo配置dubbo.annotation.package的包下面，否则将无法识别，无法初始化。

4、pom.xml文件配置参考

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <modelVersion>4.0.0</modelVersion>    <artifactId>dubbo-provider</artifactId>    <packaging>jar</packaging>    <name>dubbo-provider</name>    <description>Demo project for Spring Boot</description>    <parent>        <groupId>com.hhly</groupId>        <artifactId>dubbo</artifactId>        <version>0.0.1-SNAPSHOT</version>    </parent>    <dependencies>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>        <dependency>            <groupId>com.hhly</groupId>            <artifactId>dubbo-interface</artifactId>            <version>0.0.1-SNAPSHOT</version>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>dubbo</artifactId>            <version>2.5.3</version>            <exclusions>                <exclusion>                    <groupId>org.springframework</groupId>                    <artifactId>spring</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>org.apache.zookeeper</groupId>            <artifactId>zookeeper</artifactId>            <version>3.4.10</version>            <exclusions>                <exclusion>                    <groupId>org.slf4j</groupId>                    <artifactId>slf4j-log4j12</artifactId>                </exclusion>            </exclusions>        </dependency>        <dependency>            <groupId>com.101tec</groupId>            <artifactId>zkclient</artifactId>            <version>0.10</version>        </dependency>    </dependencies>    <build>        <plugins>            <plugin>                <groupId>org.springframework.boot</groupId>                <artifactId>spring-boot-maven-plugin</artifactId>            </plugin>        </plugins>    </build></project>

5、遇到的问题

5.1、dubbo-provider项目无法启动

报错，报错信息如下：

Exception in thread "main" java.lang.NoSuchMethodError: org.springframework.core.annotation.AnnotationAwareOrderComparator.sort(Ljava/util/List;)V    at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:404)    at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:393)    at org.springframework.boot.SpringApplication.initialize(SpringApplication.java:260)    at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:236)    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)    at com.hhly.dubbo.DubboProviderApplication.main(DubboProviderApplication.java:11)

问题分析：在没有引入dubbo-2.5.3.jar的情况下，项目是可以正常启动的，初步判断为jar包冲突，导致了该问题。于是去dubbo-2.5.3中找线索。

通过查看pom.xml文件发现dubbo-2.5.3有引入spring-2.5.6.SEC03
dubbo-2.5.3引入spring-2.5.6.SEC03

去spring-2.5.6.SEC03中找到AnnotationAwareOrderComparator类，发现该类中确实不存在sort()方法

解决办法：
将引入的dubbo-2.5.3去除spring依赖

<dependency>    <groupId>com.alibaba</groupId>    <artifactId>dubbo</artifactId>    <version>2.5.3</version>    <exclusions>        <exclusion>            <groupId>org.springframework</groupId>            <artifactId>spring</artifactId>        </exclusion>    </exclusions></dependency>

5.2、dubbo-cosumer无法启动

报错信息如下：

java.lang.NullPointerException    at com.alibaba.dubbo.config.spring.ReferenceBean.afterPropertiesSet(ReferenceBean.java:102)    at com.alibaba.dubbo.config.spring.AnnotationBean.refer(AnnotationBean.java:292)    at com.alibaba.dubbo.config.spring.AnnotationBean.postProcessBeforeInitialization(AnnotationBean.java:233)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyBeanPostProcessorsBeforeInitialization(AbstractAutowireCapableBeanFactory.java:409)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1620)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555)    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761)    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866)    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542)    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737)    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370)    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314)    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162)    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151)    at com.hhly.user.ComsumerApplication.main(ComsumerApplication.java:22)

断点到具体位置，发现该处有两个ApplicationConfig配置，并且其中一个为null
ReferenceBean

分析：
如果此时的getConsumer().getApplication() 有值的话，就不会进入这个，于是想到在Configuration配置文件里面setter对应的值，修改Configuration文件的providerConfig()方法

    @Bean(name="defaultConsumer")    public ConsumerConfig providerConfig(ApplicationConfig applicationConfig, RegistryConfig registryConfig) {        ConsumerConfig providerConfig = new ConsumerConfig();        // 手动注入，不再由spring容器去根据类名        // (com.alibaba.dubbo.config.ApplicationConfig)去获取对应的值        providerConfig.setApplication(applicationConfig);        providerConfig.setRegistry(registryConfig);        return providerConfig;    }

深层原因，为什么会获得两个配置，还不是很清楚，囧

6、参考

dubbo用户指南

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