Gradle：使用Spring Boot Dependencies創建'fat jar'

Question

我正在使用Gradle構建一個非常簡單的spring引導應用程序（靜態內容爲99％）並將其封裝到一個嵌入式tomcat的jar中。

我試着創建所說的jar，起初結果是86k，並沒有啓動，因爲它缺少一些Spring引導類。我得出的結論是，這個jar包含了應用程序的所有依賴關係，並且因爲我確實需要一個完全獨立的jar，所以我應該做更多的研究。

這是當我發現建議將from {configurations.compile.collect { it.isDirectory() ? it : zipTree(it) }部分添加到「jar」，這會導致它引入所有的依賴關係。 （我希望）。我熟悉三元運算符的思想，我可以看到它在這裏做什麼。

不幸的是，它仍然不工作！這是我啓動時發生的錯誤，下面是我的build.gradle。

我想要一個帶有嵌入式tomcat的彈簧啓動應用程序，它完全包含在一個jar中。我在做一些非常規的事情嗎？
在這一點上的任何幫助將不勝感激。

(About 80 lines of successful Spring Boot launch messages followed immediately by: 
18:16:54.890 [main] WARN o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt 
org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean. 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:132) [SpringWsTest1.jar:na] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:474) ~[SpringWsTest1.jar:na] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:117) [SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:689) [SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:321) [SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:969) [SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:958) [SpringWsTest1.jar:na] 
    at ws.Application.main(Application.java:11) [SpringWsTest1.jar:na] 
Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean. 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:182) [SpringWsTest1.jar:na] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:155) [SpringWsTest1.jar:na] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:129) [SpringWsTest1.jar:na] 
    ... 7 common frames omitted 
18:16:54.891 [main] DEBUG o.s.b.f.s.DefaultListableBeanFactory - Destroying singletons in org.springframework.beans.factory.support.DefaultListableBeanFactory@3b084709: defining beans [org.springframework.context.annotation.internalConfigurationAnnotationProcessor,org.springframework.context.annotation.internalAutowiredAnnotationProcessor,org.springframework.context.annotation.internalRequiredAnnotationProcessor,org.springframework.context.annotation.internalCommonAnnotationProcessor,application,org.springframework.context.annotation.ConfigurationClassPostProcessor.importAwareProcessor,org.springframework.context.annotation.ConfigurationClassPostProcessor.enhancedConfigurationProcessor,demoController,greetingController,org.springframework.boot.autoconfigure.AutoConfigurationPackages]; root of factory hierarchy 
18:16:54.891 [main] ERROR o.s.boot.SpringApplication - Application startup failed 
org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean. 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:132) ~[SpringWsTest1.jar:na] 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:474) ~[SpringWsTest1.jar:na] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:117) ~[SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:689) [SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:321) [SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:969) [SpringWsTest1.jar:na] 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:958) [SpringWsTest1.jar:na] 
    at ws.Application.main(Application.java:11) [SpringWsTest1.jar:na] 
Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean. 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:182) ~[SpringWsTest1.jar:na] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:155) ~[SpringWsTest1.jar:na] 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:129) ~[SpringWsTest1.jar:na] 
    ... 7 common frames omitted 
Exception in thread "main" org.springframework.context.ApplicationContextException: Unable to start embedded container; nested exception is org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean. 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:132) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:474) 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:117) 
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:689) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:321) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:969) 
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:958) 
    at ws.Application.main(Application.java:11) 
Caused by: org.springframework.context.ApplicationContextException: Unable to start EmbeddedWebApplicationContext due to missing EmbeddedServletContainerFactory bean. 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.getEmbeddedServletContainerFactory(EmbeddedWebApplicationContext.java:182) 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.createEmbeddedServletContainer(EmbeddedWebApplicationContext.java:155) 
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.onRefresh(EmbeddedWebApplicationContext.java:129) 
    ... 7 more 

的build.gradle我使用：

println System.getProperty("java.home") 

buildscript { 
    repositories { 
     mavenCentral() 
    } 
    dependencies { 
     classpath("org.springframework.boot:spring-boot-gradle-plugin:1.2.7.RELEASE") 
    } 
} 

apply plugin: 'java' 
apply plugin: 'eclipse' 
apply plugin: 'idea' 
apply plugin: 'spring-boot' 


jar { 
    manifest { 
     attributes 'Main-Class': 'ws.Application' 
    } 

    from { 
     configurations.compile.collect { it.isDirectory() ? it : zipTree(it) } 
    } 
} 


repositories { 
    mavenCentral() 
} 


dependencies { 
    compile("org.springframework.boot:spring-boot-starter-web") 
    testCompile("junit:junit") 
} 

task wrapper(type: Wrapper) { 
    gradleVersion = '2.3' 
} 

sourceCompatibility = 1.8 
targetCompatibility = 1.8 

Answer 1

你不必讓自己的gradle額外配置構建春季啓動應用程序的脂肪罐子神器，因爲你使用gradle這個春季開機插件。它已經有一個任務bootRepackage爲你做。您可以在官方用戶指南here和here中閱讀。

只需刪除已解壓縮的所有依賴項內容，然後使用此任務在應用程序中獲取單個jar文件即可。

順便說一句，你可能有興趣看看其他解決方案，這可能會提供更好的檔案大小，你可以閱讀其中的一個，名爲膠囊，in this article。