是否必须仅在子模块中添加 spring-boot-starter-* 依赖项？

Question

我有一个父模块 (A)，它已作为依赖包含/导入到子模块 (B) 中。

模块 A.

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>*some-version*<version>
        </dependency>
<dependencies>

模块 B

<dependencies>
            <dependency>
                <groupId>com.xyz</groupId>
                <artifactId>module-A</artifactId>
                <version>*module-A-version*<version>
            </dependency>
<dependencies>

问题：编译没有错误，并且成功创建了模块 B (B.war) 的 war 工件。但是当我部署模块 B（即 B.war）时，它因以下错误而失败。

Exception in thread "main" java.lang.NoClassDefFoundError: org/springframework/beans/factory/config/YamlProcessor at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) at java.net.URLClassLoader.access0(URLClassLoader.java:73) at java.net.URLClassLoader.run(URLClassLoader.java:368) at java.net.URLClassLoader.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at org.springframework.boot.env.YamlPropertySourceLoader.load(YamlPropertySourceLoader.java:57) at org.springframework.boot.env.PropertySourcesLoader.load(PropertySourcesLoader.java:127) at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.loadIntoGroup(ConfigFileApplicationListener.java:462) at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:449) at org.springframework.boot.context.config.ConfigFileApplicationListener$Loader.load(ConfigFileApplicationListener.java:374) at org.springframework.boot.context.config.ConfigFileApplicationListener.addPropertySources(ConfigFileApplicationListener.java:210) at org.springframework.boot.context.config.ConfigFileApplicationListener.postProcessEnvironment(ConfigFileApplicationListener.java:179) at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEnvironmentPreparedEvent(ConfigFileApplicationListener.java:166) at org.springframework.boot.context.config.ConfigFileApplicationListener.onApplicationEvent(ConfigFileApplicationListener.java:152) at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:163) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:136) at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:119) at org.springframework.boot.context.event.EventPublishingRunListener.publishEvent(EventPublishingRunListener.java:111) at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:65) at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:54) at org.springframework.boot.SpringApplication.doRun(SpringApplication.java:325) at org.springframework.boot.SpringApplication.run(SpringApplication.java:305) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1124) at org.springframework.boot.SpringApplication.run(SpringApplication.java:1113) at com.propspace.intl.gateway.GatewayInternational.main(GatewayInternational.java:32) Caused by: java.lang.ClassNotFoundException: org.springframework.beans.factory.config.YamlProcessor at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 32 more

是不是好像我们总是要在leaf模块中包含spring-boot-starter-*而不能在一个共同的parent中定义？

Answer 1

在对 pom-starters 进行了几次 PoC 之后，确认只有 deployable 服务应该在其 pom.xml.

中定义相应的 pom-starters

因此 w.r.t 高于层级 child B 必须具有如下定义，

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
            <version>*some-version*<version>
        </dependency>
<dependencies>

Parent A 可以包含任何其他不属于 pom-starters.

的公共依赖项

是否必须仅在子模块中添加 spring-boot-starter-* 依赖项？

Mandatory to add spring-boot-starter-* dependencies in child module only?

spring

spring-boot

spring-mvc

spring-starter