SpringBoot2.7升级项目到Springboot3.1踩坑指南(jdk17/jdk21)

概要

由于SpringBoot3.x全面拥抱JDK17,兼容jdk21，jdk17乃是大势所趋。这里是从SpringBoot2.7-->SpringBoot3.1踩坑指南。
提前阅读：jdk8升级JDK17避坑指南（适用于SpringBoot2.3—SpringBoot2.7升级）

国内顶级开源项目升级情况

国内顶级开源项目升级到springBoot3情况，可以作为升级SpringBoot3的风向标。仅对比国内规模使用，落地过万企业的开源项目
参考：国内顶级开源项目：芋道、ruoyi、JeecgBoot、pig、SpringBlade功能对比

适配SpringBoot3指南

• 参考1-微信公众号-这可能是最全的SpringBoot3新版本变化了！、
• 参考2-SpringBoot官网-Spring Boot 3.0 Release Notes、
• 参考3-微信公众号-Swagger升级指南：Swagger2与Swagger3注解差异揭秘、
• 参考4-微信公众号-Dante Cloud 3.2.0.0 发布，首个适配 Spring Boot 3.2版本及经验分享
• 参考5-JeecgBoot 文档中心-升级SpringBoot3

SpringBoot3升级要点

前提说明，建议先完成springboot2.x—>springBoot2.7.x+jdk17的适配，这里升级难度会小很多。参考：文章最前面的文章。

1、jdk17变动（如javax）

详见： jdk8升级JDK17避坑指南（适用于SpringBoot2.3—SpringBoot2.7升级）

• 模块化对反射的影响==>对系统类的反射增加了限制，需要打开限制增加jvm启动参数add-opens，自己写的类，可以正常使用反射。
• 删除sun.misc 下的包，如sun.misc.BASE64Encoder==>java.util.Base64替换
• 删除JAXB、soup相关==>maven仓库上面有新的maven坐标，引入新依赖即可
• 删除javax.annotation==>maven仓库上面有新的maven坐标，引入依赖即可

2、redis修改spring.redis.host ===> spring.data.redis.host

redis配置命令空间进行了修改，需要注意。
参考：Spring Boot3.0(九)：整合Redis

--- # redis 配置,注意springboot 3.x 有 data，2.x 没有 data
## spring.redis.host ===> spring.data.redis.host
spring:
  data:
    redis:
      host: 10.16.58.180
      port: 6379
      password: Admin123
      database: 6      

3、SpringCloudApplication注解被删除

使用@SpringBootApplication替换

4、不兼容升级import java.servlet====>import jakarta.servlet

servlet捐献给社区，为了避免版权问题，修改了包名，导致不兼容.

• javax.servlet===> jakarta.servlet
• javax.validation ===> jakarta.validation
• javax.annotation ===> jakarta.annotation
• javax.mail ===> jakarta.mail
• javax.websocket ==> jakarta.websocket

 <!-- Java Servlet jakarta -->
            <dependency>
                <groupId>jakarta.servlet</groupId>
                <artifactId>jakarta.servlet-api</artifactId>
                <version>6.0.0</version>
            </dependency>  

5、swagger集成 弃用springfox—>springdoc不兼容升级

springfox不维护了，springboot3使用springdoc,并启用openapi3.0,相关注解进行了变化。

参考：spring boot 3 整合 swagger3、
参考：Swagger升级指南：Swagger2与Swagger3注解差异揭秘、
参考：OpenApi3.0注解说明

// idea正则替换01
import io.swagger.annotations.Api;
import io.swagger.v3.oas.annotations.tags.Tag;
@Api\(tags = "([^\"]+)", hidden = ([^\"]+), description = "([^\"]+)"\)
@Tag(name = "$1", description = "$3")

@Api\(value = "([^\"]+)", tags = "([^\"]+)"\)
@Tag(name = "$1", description = "$2")

@Api\(tags = "([^\"]+)", description = "([^\"]+)"\)
@Tag(name = "$1", description = "$2")

@Api\(tags = "([^\"]+)"\)
@Tag(name = "$1")

// idea正则替换02
import io.swagger.annotations.ApiOperation;
import io.swagger.v3.oas.annotations.Operation;
@ApiOperation\(value = "([^\"]+)", notes = "([^\"]+)", position = ([^\"]+)\)
@Operation(summary = "$1", description= "$2")

@ApiOperation\(value = "([^\"]+)", httpMethod = "([^\"]+)", produces = "([^\"]+)"\)
@Operation(summary = "$1", method = "$2")

@ApiOperation\(value = "([^\"]+)", notes = "([^\"]+)"\)
@Operation(summary = "$1", description = "$2")

@ApiOperation\(value = "([^\"]+)", httpMethod = "([^\"]+)"\)
@Operation(summary = "$1", method = "$2")

@ApiOperation\(value = "([^\"]+)"\)
@ApiOperation\("([^\"]+)"\)
@Operation(summary = "$1")

// idea正则替换03
import io.swagger.annotations.ApiModel;
import io.swagger.v3.oas.annotations.media.Schema;

@ApiModel\(value = "([^\"]+)"\)
@Schema(description = "$1")

@ApiModel\(description = "([^\"]+)"\)
@Schema(description = "$1")

// idea正则替换04
import io.swagger.annotations.ApiModelProperty;
'';
@ApiModelProperty\(value = "([^\"]+)", example = "([^\"]+)", required = ([^\"]+)\)
@Schema(description = "$1", example = "$2", required= $3)

@ApiModelProperty\(value = "([^\"]+)", example = "([^\"]+)", hidden = ([^\"]+)\)
@Schema(description = "$1", example = "$2", hidden = $3)

@ApiModelProperty\(value = "([^\"]+)", example = "([^\"]+)"\)
@Schema(description = "$1", example = "$2")

@ApiModelProperty\(value = "([^\"]+)", hidden = ([^\"]+)\)
@Schema(description = "$1", hidden = $2)

@ApiModelProperty\(value = "([^\"]+)"\)
@Schema(description = "$1")

@ApiModelProperty\(hidden = ([^\"]+)\)
@Schema(hidden = $1)

@ApiModelProperty\("([^\"]+)"\)
@Schema(description = "$1")

@ApiModelProperty\(value="([^\"]+)"\)
@Schema(description = "$1")

// idea正则替换05
import io.swagger.annotations.ApiParam;
import io.swagger.v3.oas.annotations.Parameter;

@ApiParam\(value = "([^\"]+)", example = "([^\"]+)", defaultValue = "([^\"]+)"\)
@Parameter(name = "$1", example = "$2", description="$3")

@ApiParam\(value = "([^\"]+)", defaultValue = "([^\"]+)"\)
@ApiParam\(value = "([^\"]+)", example = "([^\"]+)"\)
@Parameter(name = "$1", example = "$2")

@ApiParam\(value = "([^\"]+)"\)
@ApiParam\("([^\"]+)"\)
@Parameter(name = "$1")

// idea正则替换06
import springfox.documentation.annotations.ApiIgnore;
import io.swagger.v3.oas.annotations.Hidden;
@ApiIgnore
@Hidden

@ApiIgnore HttpServletResponse response
@ApiIgnore HttpServletRequest request

// idea正则替换07
@ApiImplicitParams
@Parameters

@ApiImplicitParam\(name = "([^\"]+)", value = "([^\"]+)",required = ([^\"]+), example = "([^\"]+)", paramType = "query"\)
@Parameter(name = "$1", description = "$2", required = $3, example = "$4", in = ParameterIn.QUERY)

@ApiImplicitParam\(name = "([^\"]+)", value = "([^\"]+)", required = ([^\"]+), paramType = "query"\)
@Parameter(name = "$1", description = "$2", required = true, in = ParameterIn.QUERY)

@ApiImplicitParam\(name = "([^\"]+)", value = "([^\"]+)", dataType = "([^\"]+)", required = ([^\"]+)\)
@Parameter(name = "$1", description = "$2", schema = @Schema(type = "$3"), required = $4)

@ApiImplicitParam\(name = "([^\"]+)", value = "([^\"]+)", dataType = "([^\"]+)"\)
@Parameter(name = "$1", description = "$2", schema = @Schema(type = "$3"))

@ApiImplicitParam\(name = "([^\"]+)", value = "([^\"]+)", paramType = "form"\)
@Parameter(name = "$1", description = "$2", in = ParameterIn.QUERY)

@ApiImplicitParam\(name = "([^\"]+)", value = "([^\"]+)", dataType = "__file", paramType = "form"\)
@Parameter(name = "$1", description = "$2", example = "__file", in = ParameterIn.QUERY)

@ApiImplicitParam\(value = "([^\"]+)"\)
@Parameter(description = "$2")

swaggr2实例

// Swagger2 实体类
@Getter
@Setter
@NoArgsConstructor
@ApiModel(value = "根据儿童证件号码查询儿童档案")
public class ChildGetByChildNoVo implements Serializable {
    @ApiModelProperty(value = "身份证")
    private String childNo;

    private Long personId;
}

// Swagger2 Controller
@AllArgsConstructor
@RestController
@RequestMapping("/app/child/v2")
@Api(value = "/app/child/v2", tags = "儿童档案")
public class ChildController extends BaseController 

  @ApiOperation(value = "根据监护人ID分页查询被监护人", httpMethod = "GET", produces = "application/json")
    @GetMapping("/getByPersonId")
    @ApiImplicitParam(value = "预约id")
    public AjaxResult getByPersonId(@RequestParam(value = "pageNum",required = false,defaultValue = "1") Integer pageNum,
                                  @ApiParam("预约id,字段名:personApptId,默认无") @RequestParam(value = "personApptId") Long personApptIdpersonId,
                                   @ApiIgnore HttpServletRequest request
                                   ){

        IPage<ApptChildRelationship> page = new Page<>(pageNum,pageSize);
        IPage<ChildApiVo> pageData = childService.getByPersonId(page,personId);
        TableDataInfo rspData = new TableDataInfo();
        rspData.setCode(200);
        rspData.setRows(pageData.getRecords());
        rspData.setMsg("查询成功");
        rspData.setTotal(pageData.getTotal());
        return AjaxResult.success(rspData);
    }
 
 @PostMapping("/getCode")
    @Operation(summary = "获取预约码", method = "POST")
    @ApiImplicitParam(value = "预约id")
    @ApiImplicitParams({
            @ApiImplicitParam(name = "personId", value = "用户id", paramType = "form"),
            @ApiImplicitParam(name = "apptId", value = "预约id", paramType = "form"),
            @ApiImplicitParam(name = "collectLocationId", value = "采样点id", paramType = "form"),
    })
    public String getCode(Long personId, Long apptId, Long collectLocationId) {
        return vficPersonService.generateApptQrCode(apptId, personId, collectLocationId);
    }
}

swagger3示例

6、动态数据源baomidou的dynamic-datasource依赖变动

经过测试，该条也可以不升级
参考1：baomidou dynamic-datasource、
参考2：kancloud tracy5546 dynamic-datasource

<!-- spring-boot 1.5.x 2.x.x 3.xx -->
<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>dynamic-datasource-spring-boot-starter</artifactId>
  <version>${version}</version>
</dependency>

<!-- spring-boot 3.x.x -->
<dependency>
  <groupId>com.baomidou</groupId>
  <artifactId>dynamic-datasource-spring-boot3-starter</artifactId>
  <version>${version}</version>
</dependency>

7、Spring Framework 6.0 中删除了对 Apache HttpClient 支持（RestTemplate受影响）

升级到SpringBoot3发现依赖提示缺少：rg.apache.httpcomponents:httpclient，一些三方库可能依赖httpclient,就需要自己手工引入依赖。三方包如：spring-data-elasticsearch5、nacos-client 1.4.6、weixin-java-pay 4.0.0、htmlunit 3.6

参考： Spring-Boot-3.0-Migration-Guide#apache-httpclient-in-resttemplate、

<!-- spring framwork 5.x中默认引入apcache httpclient4，在spring framwork6.x中如果需要要手工引入 -->
<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.14</version>
</dependency>

<!-- spring framwork 6.x中的apcache httpclient5 -->
<dependency>
    <groupId>org.apache.httpcomponents.client5</groupId>
    <artifactId>httpclient5</artifactId>
    <version>5.3</version>
</dependency>

8、SpringBoot3.0整合RocketMQ时出现未能加载bean文件

springboot2.x使用rocketmq没有问题，springboot3出现，required a bean of type ‘org.apache.rocketmq.spring.core.RocketMQTemplate’ that could not be found.

参考1：SpringBoot3.0整合RocketMQ时出现未能加载bean文件
参考2：Spring boot 3.0整合RocketMQ及不兼容的问题

<dependency>
            <groupId>org.apache.rocketmq</groupId>
            <artifactId>rocketmq-spring-boot-starter</artifactId>
            <!--    目前也没有新版本，roketmq2.2.3没有适配springboot3-->
            <version>2.2.3</version>
        </dependency>

// 定义个配置类，引入也可以：
@Configuration
@Import({RocketMQAutoConfiguration.class})
public class RocketMQConfig {
}

9、springboot3默认依赖 elasticsearch从7.x升级到8.x

• 配置文件地址修改：spring.elasticsearch.rest.uris==>spring.elasticsearch.uris
• springboot3要求elasticsearch必须升级到8.x，不能使用7.x，否则报错：缺失响应头X-Elastic-Product(Elasticsearch)
• 废弃：high client客户端
• 要求ElasticSearch必须8.x

10、springboot 3.2 openFeign加载失败暂未解决 (3.1没问题)

启动失败 feign导致 not annotated with HTTP method type (ex. GET, POST)

• https://blog.csdn.net/nailsoul/article/details/105223740
• https://www.jianshu.com/p/11b4cbc8951a
• https://juejin.cn/post/7112414513550491656

11、hutool5.8–>hutool6.0升级要要点

说明常见类，如果找不到，请看源码注释，注释上面写的有，或者全局搜索即可，无需多说。

• ServletUtil–>JakartaServletUtil
• hutool类变化说明: 【6.0.0】升级到6.0不兼容情况汇总，大家一起来统计维护呀、
• 国密相关SmUtil，使用6.0x问题，参加：hutool 5.x 和 hutool 6.x crypto 国密SMUtil 模块放在一个工程中会产生冲突

12、Centos7使用jdk21报错

java: /lib64/libc.so.6: version `GLIBC_2.14’ not found (required by /usr/local/java/jdk-21.0.2+13/bin/…/lib/libjli.so)

原因，Centos6缺失GLIBC_2.14，报错缺失2.14、2.15解决办法相同。
只需要安装最高版本，自动安装低版本，比如：安装2.17.自动安装2.14

参考1：version `GLIBC_2.14’ not found 问题解决

参考2：解决 /lib64/libc.so.6: version `GLIBC_2.15’ not found 问题

最新已经是2.38了，可以直接安装：wget --no-check-certificate https://ftp.gnu.org/gnu/glibc/glibc-2.38.tar.gz，安装前确保安装的有gcc。

• Centos6 推荐2.17

13、@Async注解报错Invalid return type for async method (only Future and void

分析原因，springboot2.7一切正常，升级到springboot3.x@Async标记的方法，只能返还void或者Future(@Async+Future+AsyncResult返回值)

参考1：spring 升级到JDK 17和Sping Boot 3后，异步仅接受Future和void作为返回类型
参考2：Async only accepted Future and void as return type after upgrade to JDK 17 and Spring Boot 3文章来源地址https://www.toymoban.com/news/detail-837559.html

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