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dubbo处理自定义异常

10月前 作者：沉河不浮 分类：Toy博客 阅读(31) 违法举报

这篇具有很好参考价值的文章主要介绍了dubbo处理自定义异常。希望对大家有所帮助。如果存在错误或未考虑完全的地方，请大家不吝赐教，您也可以点击"举报违法"按钮提交疑问。

dubbo处理自定义异常

背景

在实际项目中，我们不可避免地需要使用自定义的异常，一般这个异常会继承RuntimeException，然后我们通过@RestControllerAdvice注解，拦截业务异常类，做一些处理，但是在使用dubbo构建项目时，会发现provider抛出自定义异常，然后在消费者端，不会捕捉到我们的自定义异常，而是以RuntimeException的形式被捕获。

原因

dubbo的异常处理类是org.apache.dubbo.rpc.filter.ExceptionFilter类，在这个类中，我们查看它的源码如下：

// Source code recreated from a .class file by IntelliJ IDEA
// (powered by FernFlower decompiler)
//

package org.apache.dubbo.rpc.filter;

import java.lang.reflect.Method;
import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.ReflectUtils;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.rpc.Filter;
import org.apache.dubbo.rpc.Invocation;
import org.apache.dubbo.rpc.Invoker;
import org.apache.dubbo.rpc.Result;
import org.apache.dubbo.rpc.RpcContext;
import org.apache.dubbo.rpc.RpcException;
import org.apache.dubbo.rpc.BaseFilter.Listener;
import org.apache.dubbo.rpc.service.GenericService;

@Activate(
    group = {"provider"}
)
public class ExceptionFilter implements Filter, Listener {
    private Logger logger = LoggerFactory.getLogger(ExceptionFilter.class);

    public ExceptionFilter() {
    }

    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        return invoker.invoke(invocation);
    }

    public void onResponse(Result appResponse, Invoker<?> invoker, Invocation invocation) {
        if (appResponse.hasException() && GenericService.class != invoker.getInterface()) {
            try {
                Throwable exception = appResponse.getException();
                if (!(exception instanceof RuntimeException) && exception instanceof Exception) {
                    return;
                }

                try {
                    Method method = invoker.getInterface().getMethod(invocation.getMethodName(), invocation.getParameterTypes());
                    Class<?>[] exceptionClasses = method.getExceptionTypes();
                    Class[] var7 = exceptionClasses;
                    int var8 = exceptionClasses.length;

                    for(int var9 = 0; var9 < var8; ++var9) {
                        Class<?> exceptionClass = var7[var9];
                        if (exception.getClass().equals(exceptionClass)) {
                            return;
                        }
                    }
                } catch (NoSuchMethodException var11) {
                    return;
                }

                this.logger.error("Got unchecked and undeclared exception which called by " + RpcContext.getServiceContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + exception.getClass().getName() + ": " + exception.getMessage(), exception);
                String serviceFile = ReflectUtils.getCodeBase(invoker.getInterface());
                String exceptionFile = ReflectUtils.getCodeBase(exception.getClass());
                if (serviceFile != null && exceptionFile != null && !serviceFile.equals(exceptionFile)) {
                    String className = exception.getClass().getName();
                    if (!className.startsWith("java.") && !className.startsWith("javax.")) {
                        if (exception instanceof RpcException) {
                            return;
                        }

                        appResponse.setException(new RuntimeException(StringUtils.toString(exception)));
                        return;
                    }

                    return;
                }

                return;
            } catch (Throwable var12) {
                this.logger.warn("Fail to ExceptionFilter when called by " + RpcContext.getServiceContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + var12.getClass().getName() + ": " + var12.getMessage(), var12);
            }
        }

    }

    public void onError(Throwable e, Invoker<?> invoker, Invocation invocation) {
        this.logger.error("Got unchecked and undeclared exception which called by " + RpcContext.getServiceContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + e.getClass().getName() + ": " + e.getMessage(), e);
    }

    public void setLogger(Logger logger) {
        this.logger = logger;
    }
}

从上面的源码中，我们可以知道：

1. 如果provider实现了GenericService接口，直接抛出异常
2. 如果是checked异常，直接抛出
3. 在方法签名上有声明，直接抛出
4. 异常类和接口类在同一个jar包，直接抛出
5. 是JDK自带的异常，直接抛出
6. 是dubbo本身的异常，直接抛出
7. 否则，保证为RuntimeException抛出

针对上述内容，我们抛出自定义异常的实现方案有：

1)provider实现GenericService接口.(我没试过这种方式,应该是要自己实现i n v o k e ( ) 方法 , 网上说直接把 invoke()方法,网上说直接把invoke()方法,网上说直接把invoke()方法废弃掉不知道是怎么处理的,直接返回null肯定是不行的)

2)自定义异常声明为checked异常(这没啥说了,不过一般自定义异常都是unchecked)

3)在方法签名上声明抛出异常(这种基本上所有接口都要写,麻烦)

4)异常类和接口类在同一jar包里(存在链式调用时,这种可能不适用)

5)自定义异常的包名以java.或javax.开头(dubbo判断jdk自带异常的条件,一般项目都有自己的命名规范,这样干的估计很少)

6) 将dubbo源码中的ExceptionFilter复制到我们的项目名并该名为DubboExceptionFiler，然后修改源代码，遇到我们自定义的异常后，直接返回

下面我们通过演示项目，来介绍第4和第6种方法。

演示代码

创建一个maven项目，假设名为：rpcException01，pom.xml如下：

<?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>

    <groupId>org.example</groupId>
    <artifactId>rpcException01</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
 

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
        <dubbo.version>3.0.2.1</dubbo.version>
        <spring-dubbo.version>2.0.0</spring-dubbo.version>
        <spring-boot-dependencies.version>2.7.0</spring-boot-dependencies.version>
        <lombok.version>1.18.22</lombok.version>
    </properties>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot-dependencies.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-bom</artifactId>
                <version>${dubbo.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.apache.dubbo</groupId>
                <artifactId>dubbo-spring-boot-starter</artifactId>
                <version>${dubbo.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <version>${lombok.version}</version>
                <scope>compile</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

</project>

在该项目下，创建一个子模块，假设名为rpc-common，用于存储我们的一些返回结果类
pom.xml

<?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">
    <parent>
        <artifactId>rpcException01</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>rpc-common</artifactId>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
    </dependencies>

</project>

ResultCode.java，返回状态码枚举类

package com.young.common.enums;


import java.io.Serializable;

public enum ResultCode{
    SUCCESS(200,"操作成功"),
    FAIL(400,"操作失败"),
    ERROR(500,"服务器错误");
    private Integer code;
    private String msg;
    private ResultCode(Integer code,String msg){
        this.code=code;
        this.msg=msg;
    }
    public Integer getCode(){
        return this.code;
    }
    public String getMsg(){
        return this.msg;
    }
}

ResultVO.java，返回结果类

package com.young.common.vo;

import com.young.common.enums.ResultCode;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.io.Serializable;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class ResultVO <T> implements Serializable {
    private Integer code;
    private String msg;
    private T data;
    public ResultVO(ResultCode resultCode){
        this.code=resultCode.getCode();
        this.msg=resultCode.getMsg();
    }
    public ResultVO(ResultCode resultCode,T data){
        this.code=resultCode.getCode();
        this.msg=resultCode.getMsg();
        this.data=data;
    }
    public ResultVO(Integer code,String msg){
        this.code=code;
        this.msg=msg;
        this.data=null;
    }
}

ResultVOUtil.java，返回结果工具类

package com.young.common.util;

import com.young.common.enums.ResultCode;
import com.young.common.vo.ResultVO;

public class ResultVOUtil<T> {
    public static <T> ResultVO<T> success(){
        return new ResultVO<T>(ResultCode.SUCCESS);
    }
    public static <T> ResultVO<T> success(T data){
        return new ResultVO<T>(ResultCode.SUCCESS,data);
    }
    public static <T> ResultVO<T> fail(){
        return new ResultVO<T>(ResultCode.FAIL);
    }
    public static <T> ResultVO<T> fail(ResultCode resultCode){
        return new ResultVO<T>(resultCode);
    }
    public static <T> ResultVO<T> error(){
        return new ResultVO<T>(ResultCode.ERROR);
    }
}

BusinessException.java，自定义异常类

package com.young.common.err;

import com.young.common.enums.ResultCode;

public class BusinessException extends RuntimeException{
    private ResultCode resultCode;
    public BusinessException(){}
    public BusinessException(ResultCode resultCode){
        super(resultCode.getMsg());
        this.resultCode=resultCode;
    }
    public ResultCode getResultCode(){
        return this.resultCode;
    }
}

再创建一个模块，假设名为dubbo-api，用于定义接口
pom.xml

<?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">
    <parent>
        <artifactId>rpcException01</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>rpc-api</artifactId>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>rpc-common</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
    </dependencies>

</project>

TestService.java，测试接口类

package com.young.api.service;

public interface TestService {
    String hello1();
    String hello2();
    String hello3();
}

ApiBusinessException.java ，和接口在同一个包下，这样的话可以直接获取到自定义的异常

package com.young.api.service;

import com.young.common.enums.ResultCode;

import java.io.Serializable;

public class ApiBusinessException extends RuntimeException{
    private ResultCode resultCode;
    public ApiBusinessException(){
    }
    public ApiBusinessException(ResultCode resultCode){
        super(resultCode.getMsg());
        this.resultCode=resultCode;
    }
    public ResultCode getResultCode(){
        return this.resultCode;
    }
}

再创建一个模块，rpc-provider，用于提供服务
pom.xml

<?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">
    <parent>
        <artifactId>rpcException01</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>rpc-consumer</artifactId>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>rpc-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-zookeeper</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

</project>

TestServiceImpl.java

package com.young.provider.service.impl;

import com.young.api.service.ApiBusinessException;
import com.young.api.service.TestService;
import com.young.common.enums.ResultCode;
import com.young.common.err.BusinessException;
import org.apache.dubbo.config.annotation.DubboService;
import org.apache.dubbo.rpc.filter.ExceptionFilter;
import org.apache.dubbo.rpc.service.GenericException;
import org.apache.dubbo.rpc.service.GenericService;
import org.springframework.stereotype.Service;

@Service
@DubboService
public class TestServiceImpl implements TestService {
    @Override
    public String hello1() {
        //抛出rpc-common中的异常
        throw new BusinessException(ResultCode.ERROR);
    }

    @Override
    public String hello2() {
        System.out.println("访问到hello2================");
        //抛出rpc-api中的异常
        throw new ApiBusinessException(ResultCode.ERROR);
    }

    @Override
    public String hello3(){
        return "hello world";
    }

}

DubboExceptionFilter.java，复制ExceptionFilter的源代码，然后进行修改

package com.young.provider.filter;

import org.apache.dubbo.common.extension.Activate;
import org.apache.dubbo.common.logger.Logger;
import org.apache.dubbo.common.logger.LoggerFactory;
import org.apache.dubbo.common.utils.ReflectUtils;
import org.apache.dubbo.common.utils.StringUtils;
import org.apache.dubbo.rpc.*;
import org.apache.dubbo.rpc.filter.ExceptionFilter;
import org.apache.dubbo.rpc.service.GenericService;

import java.lang.reflect.Method;

/**
 * 复制ExceptionFilter的源代码，然后进行修改
 */
@Activate(
        group = {"provider"}
)
public class DubboExceptionFilter implements Filter, BaseFilter.Listener {
    private Logger logger = LoggerFactory.getLogger(org.apache.dubbo.rpc.filter.ExceptionFilter.class);

    public DubboExceptionFilter() {
    }

    public Result invoke(Invoker<?> invoker, Invocation invocation) throws RpcException {
        return invoker.invoke(invocation);
    }

    public void onResponse(Result appResponse, Invoker<?> invoker, Invocation invocation) {
        if (appResponse.hasException() && GenericService.class != invoker.getInterface()) {
            try {
                Throwable exception = appResponse.getException();
                if (!(exception instanceof RuntimeException) && exception instanceof Exception) {
                    return;
                }

                try {
                    Method method = invoker.getInterface().getMethod(invocation.getMethodName(), invocation.getParameterTypes());
                    Class<?>[] exceptionClasses = method.getExceptionTypes();
                    Class[] var7 = exceptionClasses;
                    int var8 = exceptionClasses.length;

                    for(int var9 = 0; var9 < var8; ++var9) {
                        Class<?> exceptionClass = var7[var9];
                        if (exception.getClass().equals(exceptionClass)) {
                            return;
                        }
                    }
                } catch (NoSuchMethodException var11) {
                    return;
                }

                this.logger.error("Got unchecked and undeclared exception which called by " + RpcContext.getServiceContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + exception.getClass().getName() + ": " + exception.getMessage(), exception);
                String serviceFile = ReflectUtils.getCodeBase(invoker.getInterface());
                String exceptionFile = ReflectUtils.getCodeBase(exception.getClass());
                if (serviceFile != null && exceptionFile != null && !serviceFile.equals(exceptionFile)) {
                    String className = exception.getClass().getName();
                    System.out.println("className:"+className);
                    if (!className.startsWith("java.") && !className.startsWith("javax.")) {
                        //如果是自定义的异常，也直接返回
                        if (className.startsWith("com.young.common.err.")){
                            return ;
                        }

                        if (exception instanceof RpcException) {
                            return;
                        }

                        appResponse.setException(new RuntimeException(StringUtils.toString(exception)));
                        return;
                    }

                    return;
                }

                return;
            } catch (Throwable var12) {
                this.logger.warn("Fail to ExceptionFilter when called by " + RpcContext.getServiceContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + var12.getClass().getName() + ": " + var12.getMessage(), var12);
            }
        }

    }

    public void onError(Throwable e, Invoker<?> invoker, Invocation invocation) {
        this.logger.error("Got unchecked and undeclared exception which called by " + RpcContext.getServiceContext().getRemoteHost() + ". service: " + invoker.getInterface().getName() + ", method: " + invocation.getMethodName() + ", exception: " + e.getClass().getName() + ": " + e.getMessage(), e);
    }

    public void setLogger(Logger logger) {
        this.logger = logger;
    }
}

然后在resource目录下，创建一个META-INF目录，在META-INF目录下，再创建一个dubbo目录，然后在dubbo目录下，创建一个文件，文件名为:org.apache.dubbo.rpc.Filter，文件内容为：

dubboExceptionFilter=com.young.provider.filter.DubboExceptionFilter

application.yml

server:
  port: 8001
spring:
  application:
    name: provider-service
dubbo:
  registry:
    address: zookeeper://localhost:2181
  protocol:
    port: 29081
    name: dubbo
    host: 127.0.0.1
  provider:
    filter: dubboExceptionFilter,-exception

创建rpc-consumer模块，pom.xml

<?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">
    <parent>
        <artifactId>rpcException01</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>rpc-consumer</artifactId>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.example</groupId>
            <artifactId>rpc-api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.dubbo</groupId>
            <artifactId>dubbo-registry-zookeeper</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>

</project>

GlobalExceptionHandler.java，全局异常处理类

package com.young.consumer.handler;

import com.young.api.service.ApiBusinessException;
import com.young.common.enums.ResultCode;
import com.young.common.err.BusinessException;
import com.young.common.util.ResultVOUtil;
import com.young.common.vo.ResultVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.dubbo.rpc.filter.ExceptionFilter;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

@RestControllerAdvice
@Slf4j
public class GlobalExceptionHandler {
    @ExceptionHandler(value = BusinessException.class)
    public ResultVO handlerBusiness(BusinessException e){
        log.info("捕获businessException===============");
        return ResultVOUtil.fail(e.getResultCode());
    }

    @ExceptionHandler(value = ApiBusinessException.class)
    public ResultVO handlerApiBusinessException(ApiBusinessException e){
        log.info("捕获apiBusinessException===============");
        return ResultVOUtil.fail(e.getResultCode());
    }

    @ExceptionHandler(value = Exception.class)
    public ResultVO handlerException(Exception e){
        e.printStackTrace();
        log.info("捕获exception===============");
        return new ResultVO(ResultCode.FAIL.getCode(),e.getMessage());
    }
}

TestController.java

package com.young.consumer.controller;

import com.young.api.service.TestService;
import com.young.common.util.ResultVOUtil;
import com.young.common.vo.ResultVO;
import org.apache.dubbo.config.annotation.DubboReference;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class TestController {
    @DubboReference
    private TestService testService;

    @GetMapping("/hello1")
    public ResultVO hello1(){
        String s = testService.hello1();
        return ResultVOUtil.success(s);
    }

    @GetMapping("/hello2")
    public ResultVO hello2(){
        String s = testService.hello2();
        return ResultVOUtil.success(s);
    }

    @GetMapping("/hello3")
    public ResultVO hello3(){
        String s = testService.hello3();
        return ResultVOUtil.success(s);
    }
}

application.yml

server:
  port: 8002
spring:
  application:
    name: consumer-service
dubbo:
  registry:
    address: zookeeper://localhost:2181
  protocol:
    port: 29082
    name: dubbo
    host: 127.0.0.1
  provider:
    filter: dubboExceptionFilter,-exception

完整文件目录如下图所示：
dubbo处理自定义异常
dubbo处理自定义异常
分别启动zookeeper，ProviderApplication，ConsumerApplication，分别访问/hello1, /hello2， /hello3，结果如下：
dubbo处理自定义异常
dubbo处理自定义异常
dubbo处理自定义异常
至此，我们就实现了dubbo捕获自定义异常了，这里再记录一个小坑，我们在自定义异常的时候，自定义的异常要有无参构造函数，因为dubbo默认是使用Hessian进行反序列化的，该反序列化创建对象的时候，会取参数最少的构造方法来创建对象，构造方法参数设置默认值，基本类型设置为相应基本类型的默认值，不是基本类型设置为null，如果没有无参构造方法，访问接口时，结果如下：
dubbo处理自定义异常

参考文章

dubbo(四)异常处理
Dubbo如何处理业务异常，这个一定要知道哦！
Dubbo通过Hessian反序列化对象失败解决文章来源地址https://www.toymoban.com/news/detail-452415.html

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