那些遇到过的问题

升级spring版本后得到java.lang.NoClassDefFoundError：

Jey*_*eyJ 4 java spring pom.xml

我正在尝试在我们拥有的多个项目中将 spring 从 2.1.1 升级到 2.2.0。我已经在几个项目中完成了，一切都很顺利。

在当前项目中，我做了同样的改变： 

<parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.2.0.RELEASE</version>
        <relativePath/>
</parent>

<properties>
        <spring-cloud.version>Hoxton.RELEASE</spring-cloud.version>
        <spring.boot.version>2.2.0.RELEASE</spring.boot.version>
    ...
    ...

</properties>

<dependencyManagement>
        <dependencies>
            <dependency>
                <!-- Import dependency management from Spring Boot -->
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring.boot.version}</version>
            </dependency>
        .....
        .....
</dependencyManagement>

<dependencies>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-core</artifactId>
        </dependency>
...
</dependencies>
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现在，当我尝试启动我的应用程序时，出现以下错误： 

Caused by: java.lang.NoClassDefFoundError: org/springframework/core/annotation/MergedAnnotations$SearchStrategy
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我检查并根据文档这个类应该在我当前的 spring-core 版本中可用：https : //docs.spring.io/spring/docs/5.2.0.RELEASE/javadoc-api/org/springframework/core/注释/MergedAnnotations.SearchStrategy.html

堆栈跟踪 ： 

java.lang.NoClassDefFoundError: org/springframework/core/annotation/MergedAnnotations$SearchStrategy
        at org.springframework.boot.BeanDefinitionLoader.isComponent(BeanDefinitionLoader.java:279) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:156) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:136) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.BeanDefinitionLoader.load(BeanDefinitionLoader.java:128) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.SpringApplication.load(SpringApplication.java:691) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.SpringApplication.prepareContext(SpringApplication.java:392) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:140) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:197) ~[spring-cloud-context-2.0.0.RELEASE.jar:2.0.0.RELEASE]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:104) ~[spring-cloud-context-2.0.0.RELEASE.jar:2.0.0.RELEASE]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:70) ~[spring-cloud-context-2.0.0.RELEASE.jar:2.0.0.RELEASE]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:127) ~[spring-context-5.1.3.RELEASE.jar:5.1.3.RELEASE]
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:76) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:53) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:345) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:308) ~[spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:152) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:132) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.boot.web.servlet.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:92) [spring-boot-2.2.0.RELEASE.jar:2.2.0.RELEASE]
        at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:171) [spring-web-5.1.3.RELEASE.jar:5.1.3.RELEASE]
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maven 依赖树，所有 spring 事件： 

[INFO] +- org.springframework.security:spring-security-config:jar:5.2.0.RELEASE:compile
[INFO] +- org.springframework.security:spring-security-config:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework.security:spring-security-core:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework.security:spring-security-core:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework:spring-aop:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework:spring-aop:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework:spring-beans:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-context:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-context:jar:5.2.0.RELEASE:compile
[INFO] +- org.springframework.security:spring-security-web:jar:5.2.0.RELEASE:compile
[INFO] +- org.springframework.security:spring-security-web:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework:spring-expression:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework:spring-expression:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-web:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-web:jar:5.2.0.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-tomcat:jar:2.2.0.RELEASE:provided
[INFO] +- org.springframework.boot:spring-boot-starter-tomcat:jar:2.2.0.RELEASE:provided
[INFO] +- org.springframework.boot:spring-boot-starter-data-jpa:jar:2.2.0.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-data-jpa:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-aop:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-aop:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-jdbc:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-jdbc:jar:2.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-jdbc:jar:5.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-jdbc:jar:5.2.0.RELEASE:compile
[INFO] |  +- org.springframework.data:spring-data-jpa:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.data:spring-data-jpa:jar:2.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.data:spring-data-commons:jar:2.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.data:spring-data-commons:jar:2.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework:spring-orm:jar:5.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework:spring-orm:jar:5.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-tx:jar:5.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework:spring-tx:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-aspects:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-aspects:jar:5.2.0.RELEASE:compile
[INFO] +- org.apache.cxf:cxf-spring-boot-starter-jaxrs:jar:3.2.5:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter:jar:2.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot:jar:2.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot:jar:2.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:2.2.0.RELEASE:compile
[INFO] |  |  +- org.springframework.boot:spring-boot-starter-logging:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.apache.cxf:cxf-spring-boot-autoconfigure:jar:3.2.5:compile
[INFO] +- org.springframework.boot:spring-boot-starter-actuator:jar:2.2.0.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-actuator:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-actuator-autoconfigure:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-actuator-autoconfigure:jar:2.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework.boot:spring-boot-actuator:jar:2.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework.boot:spring-boot-actuator:jar:2.2.0.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-test:jar:2.2.0.RELEASE:test
[INFO] +- org.springframework.boot:spring-boot-starter-test:jar:2.2.0.RELEASE:test
[INFO] |  +- org.springframework.boot:spring-boot-test:jar:2.2.0.RELEASE:test
[INFO] |  +- org.springframework.boot:spring-boot-test:jar:2.2.0.RELEASE:test
[INFO] |  +- org.springframework.boot:spring-boot-test-autoconfigure:jar:2.2.0.RELEASE:test
[INFO] |  +- org.springframework.boot:spring-boot-test-autoconfigure:jar:2.2.0.RELEASE:test
[INFO] |  +- org.springframework:spring-test:jar:5.2.0.RELEASE:test
[INFO] |  +- org.springframework:spring-test:jar:5.2.0.RELEASE:test
[INFO] +- org.springframework.cloud:spring-cloud-config-client:jar:2.2.0.RELEASE:compile
[INFO] +- org.springframework.cloud:spring-cloud-config-client:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-autoconfigure:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-autoconfigure:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.cloud:spring-cloud-commons:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.cloud:spring-cloud-commons:jar:2.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework.security:spring-security-crypto:jar:5.2.0.RELEASE:compile
[INFO] |  |  \- org.springframework.security:spring-security-crypto:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework.cloud:spring-cloud-context:jar:2.2.0.RELEASE:compile
[INFO] |  \- org.springframework.cloud:spring-cloud-context:jar:2.2.0.RELEASE:compile
[INFO] +- org.springframework.retry:spring-retry:jar:1.2.4.RELEASE:compile
[INFO] +- org.springframework.retry:spring-retry:jar:1.2.4.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:2.2.0.RELEASE:compile
[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-json:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-json:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-validation:jar:2.2.0.RELEASE:compile
[INFO] |  +- org.springframework.boot:spring-boot-starter-validation:jar:2.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-webmvc:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-webmvc:jar:5.2.0.RELEASE:compile
[INFO] +- org.springframework:spring-core:jar:5.2.0.RELEASE:compile
[INFO] +- org.springframework:spring-core:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-jcl:jar:5.2.0.RELEASE:compile
[INFO] |  \- org.springframework:spring-jcl:jar:5.2.0.RELEASE:compile
[INFO]    \- org.springframework.cloud:spring-cloud-starter-openfeign:jar:2.2.0.RELEASE:compile
[INFO]    \- org.springframework.cloud:spring-cloud-starter-openfeign:jar:2.2.0.RELEASE:compile
[INFO]       +- org.springframework.cloud:spring-cloud-starter:jar:2.2.0.RELEASE:compile
[INFO]       +- org.springframework.cloud:spring-cloud-starter:jar:2.2.0.RELEASE:compile
[INFO]       |  \- org.springframework.security:spring-security-rsa:jar:1.0.7.RELEASE:compile
[INFO]       |  \- org.springframework.security:spring-security-rsa:jar:1.0.7.RELEASE:compile
[INFO]       +- org.springframework.cloud:spring-cloud-openfeign-core:jar:2.2.0.RELEASE:compile
[INFO]       +- org.springframework.cloud:spring-cloud-openfeign-core:jar:2.2.0.RELEASE:compile
[INFO]       |  +- org.springframework.cloud:spring-cloud-netflix-ribbon:jar:2.2.0.RELEASE:compile
[INFO]       |  +- org.springframework.cloud:spring-cloud-netflix-ribbon:jar:2.2.0.RELEASE:compile
[INFO]       |  |  \- org.springframework.cloud:spring-cloud-netflix-archaius:jar:2.2.0.RELEASE:compile
[INFO]       |  |  \- org.springframework.cloud:spring-cloud-netflix-archaius:jar:2.2.0.RELEASE:compile
[INFO]       |  \- io.github.openfeign.form:feign-form-spring:jar:3.8.0:compile
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R.G*_*R.G 5

参考：文档

当作为 Spring IO Platform 一部分的 artifacts 在没有 version 的情况下声明时，将使用依赖项的预定义版本，对于 spring-core 它是

org.springframework 弹簧核心 5.0.13.RELEASE

https://docs.spring.io/spring/docs/5.0.13.RELEASE/javadoc-api/org/springframework/core/annotation/缺少 MergedAnnotations 类。

使用您选择的版本声明依赖项

    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-core</artifactId>
        <version>5.2.0.RELEASE</version>
    </dependency>
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更新（我之前的回答似乎有点误导）

不需要明确声明版本。文档的依赖管理部分提到了以下内容。

Spring Boot 的每个版本都提供了它支持的依赖项的精选列表。实际上，您不需要在构建配置中为这些依赖项中的任何一个提供版本，因为 Spring Boot 会为您管理这些。当您升级 Spring Boot 本身时，这些依赖项也会以一致的方式升级。

此外，此处解释了在继承起始父项时所需的升级修改。

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