spring cloud: 升级到spring boot 2.x/Finchley.RELEASE遇到的坑

spring boot2.x已经出来好一阵了,而且spring cloud 的最新Release版本Finchley.RELEASE,默认集成的就是spring boot 2.x,这几天将一个旧项目尝试着从低版本升级到 2.x,踩坑无数,记录一下:

一、gradle的问题

spring boot 2.x 要求gradle版本不能太旧,先把gradle升级到4.6版本,然后编译,各种问题,到gradle官网上查了下,build.gradle有几个小地方要调整

1.1 java-libary 的项目

即:纯工具包这种公用jar,plugins{}必须放在第1行(有buildscript的除外),类似:

plugins {
    id 'java-library'
}

然后按官网的教程,compile最好换成implementation

dependencies {
    implementation(
            ...
    )
}

1.2 常规java项目(指带容器能独立运行的项目)

buildscript {

    ext {
        springBootVersion = '2.0.1.RELEASE'
    }

    repositories {
        maven {
            url "http://maven.aliyun.com/nexus/content/groups/public/"
        }
       ...
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'org.springframework.boot'
apply plugin: 'io.spring.dependency-management'

dependencyManagement {
    imports {
        mavenBom 'org.springframework.cloud:spring-cloud-dependencies:Finchley.RELEASE'
    }
}
...

另外,gradle 高版本编译时,总会有一行讨厌的提示:

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.

编译时,可以加参数:--warning-mode=none 禁止掉,即类似:

gradle build --warning-mode=none -x test

  

二、依赖jar包版本的问题

dependencies {
    ...
    implementation(
            ...
            'org.springframework.cloud:spring-cloud-starter-consul-discovery',
            'org.springframework.cloud:spring-cloud-starter-consul-config',
            'org.springframework.cloud:spring-cloud-starter-bus-kafka',
            'org.springframework.cloud:spring-cloud-starter-sleuth',
            'org.springframework.cloud:spring-cloud-sleuth-stream:1.3.4.RELEASE',
            'org.springframework.cloud:spring-cloud-starter-hystrix:1.4.4.RELEASE',
            'org.springframework.cloud:spring-cloud-netflix-hystrix-stream',
            'org.springframework.boot:spring-boot-starter-actuator',
            'org.springframework.boot:spring-boot-starter-undertow',
            'org.springframework.boot:spring-boot-starter-mail',
            'org.springframework.boot:spring-boot-starter-jdbc',
            'org.springframework.boot:spring-boot-starter-security',
            'org.slf4j:slf4j-api:1.7.25',
            'ch.qos.logback:logback-core:1.2.3',
            'org.thymeleaf:thymeleaf-spring5:3.0.9.RELEASE',
            'org.mybatis.spring.boot:mybatis-spring-boot-starter:1.3.1',
            'tk.mybatis:mapper-spring-boot-starter:1.2.4',
            'com.github.pagehelper:pagehelper-spring-boot-starter:1.2.3'
    )
    implementation('com.alibaba:druid:1.1.9') {
        exclude group: "com.alibaba", module: "jconsole"
        exclude group: "com.alibaba", module: "tools"
    }
    implementation('org.springframework.boot:spring-boot-starter-web') {
        exclude module: "spring-boot-starter-tomcat"
        exclude module: "spring-boot-starter-jetty"
    }

    testCompile 'org.springframework.boot:spring-boot-starter-test'
}

其中

'org.springframework.cloud:spring-cloud-sleuth-stream:1.3.4.RELEASE',
'org.springframework.cloud:spring-cloud-starter-hystrix:1.4.4.RELEASE',

这二项必须指定版本号,否则编译不过。(应该最新的2.x版本的jar包,还没上传到中央仓库,无法自动识别依赖),另外pagehelper这个常用的分页组件,也建议按上面的版本来配置,否则运行时,可能会报错。

三、log4j/log4j2的问题

升级到spring boot 2.x后,不管是配置log4j还是log4j2,运行时总是报堆栈溢出的error,换成logback后,启动正常,建议大家尽量采用默认的logback,依赖项的配置参考上面的。

四、DataSourceBuilder类找不到的问题

spring boot 2.x把这个类换了package,所以找不到了,详情见:

https://stackoverflow.com/questions/50011577/spring-boot-2-0-0-datasourcebuilder-not-found-in-autoconfigure-jar
https://docs.spring.io/spring-boot/docs/current/api/org/springframework/boot/jdbc/DataSourceBuilder.html

解决办法就是引用: org.springframework.boot:spring-boot-starter-jdbc

同时修改代码import新的package: org.springframework.boot.jdbc.DataSourceBuilder

五、安全性的问题

spring boot 2.x加强了安全性,不管访问什么rest url,默认都要求登录,在application.yml里无法通过配置关闭,只能写代码调整:

import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;

/**
 * @author yangjunming
 */
@Configuration
@EnableWebSecurity
public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests().antMatchers("/").permitAll();
    }
}

这样,默认所有url都允许访问(如果是暴露在外网的服务,请慎用) 

六、各类actuator监控endpoint的路径变化

spring boot 2.x 里,actuator的endpoint默认路径变成/actuator开头,如果要使用以前的风格,放在/根下,可以在applicatino.yml里参考下面的配置:

management:
  endpoints:
    web:
      base-path: /

  

七、${spring.cloud.client.ipAddress} 无法识别

spring cloud 2.x里,${spring.cloud.client.ipAddress} 这个写法不识别,一启动就会报错,尝试了多次,无意发现,把A改成小写,居然可以了:

spring:
 ...
  application:
    name: sr-menu-service:${spring.cloud.client.ipaddress}

感觉这应该是个bug,新版本里估计会修复。

八、MetricWriter、SystemPublicMetrics类找不到的问题

spring boot 2.x里metrics默认换成了micrometer,原来的MetricWriter之类的全干掉了,详情参考官网文档

附:一些参考文档:

https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-2.0-Migration-Guide

https://spring.io/blog/2017/09/15/security-changes-in-spring-boot-2-0-m4

https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-Security-2.0

https://docs.spring.io/spring-boot/docs/2.0.4.RELEASE/reference/htmlsingle/#production-ready-metrics-getting-started

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转载自www.cnblogs.com/yjmyzz/p/spring_cloud_Finchley_RELEASE_migration.html