从Gradle中的Spring Boot中排除Tomcat依赖项 [英] Excluding Tomcat dependencies from Spring Boot in Gradle

问题描述

build.gradle的相关部分：

  compile（org.springframework.boot：spring-boot-starter）{
 exclude module：tomcat- embed-el
} 
 compile（org.springframework.boot：spring-boot-starter-jetty）
 
 compile（org.springframework.boot：spring- boot-starter-web）{
 exclude module：spring-boot-starter-tomcat
} 
  

然而，当我运行 gradle dependencies 部分tomcat仍然存在时，导致WebSockets出现问题：

  ... 
 | 
 + --- org.springframework.boot：spring-boot-starter-web： - > 1.4.1.RELEASE 
 | + --- org.springframework.boot：spring-boot-starter：1.4.1.RELEASE（*）
 | + --- org.hibernate：hibernate-validator：5.2.4.Final 
 | | + --- javax.validation：validation-api：1.1.0.Final 
 | | + --- org.jboss.logging：jboss-logging：3.2.1.Final  - > 3.3.0.Final 
 | | \ --- com.fasterxml：classmate：1.1.0  - > 1.3.1 
 | + --- com.fasterxml.jackson.core：jackson-databind：2.8.3 
 | | + --- com.fasterxml.jackson.core：jackson-annotations：2.8.0  - > 2.8.3 
 | | \ --- com.fasterxml.jackson.core：jackson-core：2.8.3 
 | + --- org.springframework：spring-web：4.3.3.RELEASE 
 | | + --- org.springframework：spring-aop：4.3.3.RELEASE（*）
 | | + --- org.springframework：spring-beans：4.3.3.RELEASE（*）
 | | + --- org.springframework：spring-context：4.3.3.RELEASE（*）
 | | \ --- org.springframework：spring-core：4.3.3.RELEASE 
 | + --- org.springframework：spring-webmvc：4.3.3.RELEASE 
 | | + --- org.springframework：spring-aop：4.3.3.RELEASE（*）
 | | + --- org.springframework：spring-beans：4.3.3.RELEASE（*）
 | | + --- org.springframework：spring-context：4.3.3.RELEASE（*）
 | | + --- org.springframework：spring-core：4.3.3.RELEASE 
 | | + --- org.springframework：spring-expression：4.3.3.RELEASE（*）
 | | \ --- org.springframework：spring-web：4.3.3.RELEASE（*）
 | \ --- org.springframework.boot：spring-boot-starter-tomcat：1.4.1.RELEASE 
 | + --- org.apache.tomcat.embed：tomcat-embed-core：8.5.5 
 | + --- org.apache.tomcat.embed：tomcat-embed-el：8.5.5 
 | \ --- org.apache.tomcat.embed：tomcat-embed-websocket：8.5.5 
 | \ --- org.apache.tomcat.embed：tomcat-embed-core：8.5.5 
 ... 
  

为什么不是 spring-boot-start-tomcat 不包括 spring-boot-starter-web ？

解决方案

>我还有 compile（org.springframework.boot：spring-boot-starter-websocket）依赖项也取决于 spring-boot -starter-Tomcat的。 Gradle依赖关系输出误导我认为 spring-boot-starter-web 是Tomcat仍然存在的原因。

  compile（org.springframework.boot：spring-boot-starter-websocket ）{
排除模块：spring-boot-starter-tomcat
} 
  

<获得的教训是，当你想排除某些事物时，仔细检查你的所有依赖关系，以确保它被排除在所有地方之外。并且可以改进gradle依赖关系输出以减少误导...

I'm using Spring Boot with Jetty and it seems I cannot exclude all the Tomcat dependencies in my Gradle build file.

Relevant part of build.gradle:

compile("org.springframework.boot:spring-boot-starter") {
    exclude module: "tomcat-embed-el"
}
compile("org.springframework.boot:spring-boot-starter-jetty")

compile("org.springframework.boot:spring-boot-starter-web") {
    exclude module: "spring-boot-starter-tomcat"
}

Yet when I run gradle dependencies parts of tomcat are still there, and causing issues with WebSockets:

...
|    
+--- org.springframework.boot:spring-boot-starter-web: -> 1.4.1.RELEASE
|    +--- org.springframework.boot:spring-boot-starter:1.4.1.RELEASE (*)
|    +--- org.hibernate:hibernate-validator:5.2.4.Final
|    |    +--- javax.validation:validation-api:1.1.0.Final
|    |    +--- org.jboss.logging:jboss-logging:3.2.1.Final -> 3.3.0.Final
|    |    \--- com.fasterxml:classmate:1.1.0 -> 1.3.1
|    +--- com.fasterxml.jackson.core:jackson-databind:2.8.3
|    |    +--- com.fasterxml.jackson.core:jackson-annotations:2.8.0 -> 2.8.3
|    |    \--- com.fasterxml.jackson.core:jackson-core:2.8.3
|    +--- org.springframework:spring-web:4.3.3.RELEASE
|    |    +--- org.springframework:spring-aop:4.3.3.RELEASE (*)
|    |    +--- org.springframework:spring-beans:4.3.3.RELEASE (*)
|    |    +--- org.springframework:spring-context:4.3.3.RELEASE (*)
|    |    \--- org.springframework:spring-core:4.3.3.RELEASE
|    +--- org.springframework:spring-webmvc:4.3.3.RELEASE
|    |    +--- org.springframework:spring-aop:4.3.3.RELEASE (*)
|    |    +--- org.springframework:spring-beans:4.3.3.RELEASE (*)
|    |    +--- org.springframework:spring-context:4.3.3.RELEASE (*)
|    |    +--- org.springframework:spring-core:4.3.3.RELEASE
|    |    +--- org.springframework:spring-expression:4.3.3.RELEASE (*)
|    |    \--- org.springframework:spring-web:4.3.3.RELEASE (*)
|    \--- org.springframework.boot:spring-boot-starter-tomcat:1.4.1.RELEASE
|         +--- org.apache.tomcat.embed:tomcat-embed-core:8.5.5
|         +--- org.apache.tomcat.embed:tomcat-embed-el:8.5.5
|         \--- org.apache.tomcat.embed:tomcat-embed-websocket:8.5.5
|              \--- org.apache.tomcat.embed:tomcat-embed-core:8.5.5
...

Why isn't spring-boot-starter-tomcat excluded from spring-boot-starter-web ?

解决方案

Aha, found the reason.

I also had compile("org.springframework.boot:spring-boot-starter-websocket") dependency that was also depending on spring-boot-starter-tomcat. Gradle dependency output mislead me into thinking that spring-boot-starter-web is the reason why Tomcat was still there.

I had to add the following:

compile("org.springframework.boot:spring-boot-starter-websocket") {
    exclude module: "spring-boot-starter-tomcat"
}

Lesson learned is that when you want to exclude something, double-check all of your dependencies to make sure it is excluded from all the places. And gradle dependencies output could be improved to make it less misleading...

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