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

时间:2021-11-25 00:18:24

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:

显著变化:

  • 与 spring boot 2.0.x 兼容
  • 不支持 spring boot 1.5.x
  • 最低要求 java 8
  • 新增 spring cloud function 和 spring cloud gateway

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:

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plugins {
 
  id 'java-library'
 
}

然后按官网的教程,compile最好换成implementation

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dependencies {
  implementation(
      ...
  )
}

1.2 常规java项目(指带容器能独立运行的项目)

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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'
 
  }
 
}<br>...

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

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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*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://*.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:

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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;
 
 
 
@configuration
 
@enablewebsecurity
 
public class securityconfiguration extends websecurityconfigureradapter {
 
  @override
 
  protected void configure(httpsecurity http) throws exception {
 
    http.authorizerequests()
 
        .anyrequest()
 
        .permitall()
 
        .and()
 
        .csrf()
 
        .disable();
 
  }
 
}

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:

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management:
 
 ...
 
 endpoints:
 
  web:
 
   base-path: /
 
   exposure:
 
    include: "*"

另外/health节点,默认情况下,只能输出很少的信息,详细信息,需要通过配置打开

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management:
 
 ...
 
 endpoint:
 
  health:
 
   show-details: always
 
 ...

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:

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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

 

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management:
 
 metrics:
 
  export:
 
   statsd:
 
    host: 10.0.*.*
 
    port: 8125
 
    flavor: etsy

上面的配置是启用statsd,然后跑起来就能看到效果,见下图

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

但是与spring boot 1.x相比,并不会直接输出具体值,要看具体值,可以用http://localhost:8001/metrics/jvm.memory.used

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

这其中的value中是jvm占用的内存(包括heap + noheap),如果只想看heap区(即:堆上的内存),可以用

http://localhost:8001/metrics/jvm.memory.used?tag=area:heap

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

同时在grafana里也能看到效果:

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

注:目前statsd里的前缀无法修改,代码写死的statsd

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

如果一台机器上部署多个spring cloud 微服务,grafana里就分不出来了(个人估计以后会改进)。

另外,如果希望通过代码获取这些metrics里具体指标值,可以参考下面的代码:

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import io.micrometer.core.instrument.meter;
 
import io.micrometer.core.instrument.meterregistry;
 
import io.micrometer.core.instrument.statistic;
 
import org.junit.test;
 
import org.springframework.beans.factory.annotation.autowired;
 
 
 
import java.util.linkedhashmap;
 
import java.util.map;
 
import java.util.function.bifunction;
 
 
 
public class metricstest extends basetest {
 
 
 
  private string metric_msg_format = "metric >> %s = %d";
 
 
 
  @autowired
 
  private meterregistry meterregistry;
 
 
 
  @test
 
  public void teststatsdconfig() {
 
    string metric = "jvm.memory.used";
 
    meter meter = meterregistry.find(metric).meter();
 
    map<statistic, double> stats = getsamples(meter);
 
    logger.info(string.format(metric_msg_format, metric, stats.get(statistic.value).longvalue()));
 
  }
 
 
 
  private map<statistic, double> getsamples(meter meter) {
 
    map<statistic, double> samples = new linkedhashmap<>();
 
    mergemeasurements(samples, meter);
 
    return samples;
 
  }
 
 
 
  private void mergemeasurements(map<statistic, double> samples, meter meter) {
 
    meter.measure().foreach((measurement) -> samples.merge(measurement.getstatistic(),
 
        measurement.getvalue(), mergefunction(measurement.getstatistic())));
 
  }
 
 
 
  private bifunction<double, double, double> mergefunction(statistic statistic) {
 
    return statistic.max.equals(statistic) ? double::max : double::sum;
 
  }
 
}

九、swagger里webmvcconfigureradapter过时的问题

webmvcconfigureradapter这个类在最新的spring boot里已经被标识为过时,正常用法参考以下:

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import org.springframework.context.annotation.bean;
 
import org.springframework.context.annotation.configuration;
 
import org.springframework.web.servlet.config.annotation.resourcehandlerregistry;
 
import org.springframework.web.servlet.config.annotation.webmvcconfigurationsupport;
 
import springfox.documentation.builders.apiinfobuilder;
 
import springfox.documentation.builders.pathselectors;
 
import springfox.documentation.builders.requesthandlerselectors;
 
import springfox.documentation.service.apiinfo;
 
import springfox.documentation.service.contact;
 
import springfox.documentation.spi.documentationtype;
 
import springfox.documentation.spring.web.plugins.docket;
 
import springfox.documentation.swagger2.annotations.enableswagger2;
 
 
 
/**
 
 * @author yangjunming
 
 * @date 13/10/2017
 
 */
 
@configuration
 
@enableswagger2
 
public class swaggerconfig extends webmvcconfigurationsupport {
 
 
 
  @override
 
  protected void addresourcehandlers(resourcehandlerregistry registry) {
 
    registry.addresourcehandler("swagger-ui.html")
 
        .addresourcelocations("classpath:/meta-inf/resources/");
 
 
 
    registry.addresourcehandler("/webjars/**")
 
        .addresourcelocations("classpath:/meta-inf/resources/webjars/");
 
  }
 
 
 
  @bean
 
  public docket createrestapi() {
 
    return new docket(documentationtype.swagger_2)
 
        .apiinfo(apiinfo())
 
        .select()
 
        .apis(requesthandlerselectors.basepackage("sr.service.menu.controller"))
 
        .paths(pathselectors.any())
 
        .build();
 
  }
 
 
 
  private apiinfo apiinfo() {
 
    return new apiinfobuilder()
 
        .title("menu-service online api document")
 
        .description("测试服务")
 
        .contact(new contact("菩提树下的杨过", "http://yjmyzz.cnblogs.com/", "yjmyzz@126.com"))
 
        .version("1.0.0")
 
        .build();
 
  }
 
}

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/

https://github.com/pagehelper/pagehelper-spring-boot

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。

原文链接:http://www.cnblogs.com/yjmyzz/p/9408700.html