添加spring-cloud-starter-sleuth后触发Pointcut must not be null异常求助

问题分析 #

你遇到的Pointcut must not be null错误，本质是AspectJ切面相关依赖冲突。结合你的依赖配置来看，核心原因是重复引入了Spring Cloud Sleuth的核心组件：

• 主项目已引入spring-cloud-starter-sleuth，该starter默认包含spring-cloud-sleuth-instrumentation模块
• 子项目client又单独引入了spring-cloud-sleuth-instrumentation，导致同一模块重复加载，引发切面定义冲突，最终触发Pointcut为空的异常

此外，你手动指定的jackson-module-kotlin:2.9.8版本与Spring Boot 2.6.4 BOM默认管理的Jackson版本（2.13.3）不兼容，可能加剧依赖冲突问题。

解决方案 #

1. 移除重复的Sleuth依赖 #

删除client项目中的spring-cloud-sleuth-instrumentation依赖，因为spring-cloud-starter-sleuth已自动包含该组件：

// 移除该行重复依赖
// implementation(group = "org.springframework.cloud", name = "spring-cloud-sleuth-instrumentation")

2. 统一依赖版本管理 #

去掉jackson-module-kotlin的手动版本号，让Spring Boot BOM自动管理兼容版本：

// 修改前
// implementation(group = "com.fasterxml.jackson.module", name = "jackson-module-kotlin", version = "2.9.8")
// 修改后
implementation(group = "com.fasterxml.jackson.module", name = "jackson-module-kotlin")

3. 验证依赖树（可选） #

使用Gradle命令检查依赖冲突，确保所有Sleuth相关依赖版本一致：

./gradlew dependencies --configuration compileClasspath | grep sleuth

输出中所有Sleuth组件的版本应统一为Spring Cloud 2021.0.1 BOM指定的版本（3.1.1）。

修改后的client项目依赖示例 #

implementation(platform("org.springframework.boot:spring-boot-dependencies:2.6.4"))
implementation(platform("org.springframework.cloud:spring-cloud-dependencies:2021.0.1"))

implementation(group = "org.springframework.boot", name = "spring-boot-starter-webflux")
testImplementation(group = "org.springframework.boot", name = "spring-boot-starter-actuator")

implementation(group = "org.springframework.security", name = "spring-security-oauth2-client")
implementation(group = "org.springframework.security", name = "spring-security-oauth2-jose")

implementation(group = "com.fasterxml.jackson.module", name = "jackson-module-kotlin")

implementation(group = "io.github.microutils", name = "kotlin-logging", version = "2.1.23")

implementation(group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-core", version = "1.6.4")
implementation(group = "org.jetbrains.kotlinx", name = "kotlinx-coroutines-reactive", version = "1.6.4")

implementation(group = "io.github.resilience4j", name = "resilience4j-circuitbreaker", version = "1.7.0")
implementation(group = "io.github.resilience4j", name = "resilience4j-kotlin", version = "1.7.0")

内容的提问来源于stack exchange，提问作者DenisKorotchenko