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Gradle搭建项目

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创建一个Spring-Boot项目

初始化
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gradle init
增加配置

多项目构建

多项目构建时，根目录下需要包含settings.gradle文件。文件中需要定义项目的名称：

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rootProject.name = 'dolphin'

include ':dolphin', ':dolphin-core',':dolphin-data'

同时在build.gradle文件中声明需要构建的项目：

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project(":dolphin"){
    description = "dolphin"

    apply plugin: 'java'
    apply plugin: 'idea'
    apply plugin: 'eclipse'
    apply plugin: 'org.springframework.boot'

// In this section you declare where to find the dependencies of your project
    repositories {
        // Use 'jcenter' for resolving your dependencies.
        // You can declare any Maven/Ivy/file repository here.
        jcenter()
    }

    // In this section you declare the dependencies for your production and test code
    dependencies {
        // The production code uses the SLF4J logging API at compile time
        compile 'org.slf4j:slf4j-api:1.7.21'

        compile('org.springframework.boot:spring-boot-starter-web')
        testCompile('org.springframework.boot:spring-boot-starter-test')
        // Declare the dependency for your favourite test framework you want to use in your tests.
        // TestNG is also supported by the Gradle Test task. Just change the
        // testCompile dependency to testCompile 'org.testng:testng:6.8.1' and add
        // 'test.useTestNG()' to your build script.
        testCompile 'junit:junit:4.12'
    }
}

project(":dolphin-core"){

}

project(":dolphin-data"){

}

配置完毕后输入命令gradle projects查看配置的多个项目，输出的结果如下:

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hldev@hldev-100:~/summerize/dolphin-framework$ gradle projects --stacktrace
:projects

------------------------------------------------------------
Root project
------------------------------------------------------------

Root project 'dolphin'
+--- Project ':dolphin' - dolphin
+--- Project ':dolphin-core'
\--- Project ':dolphin-data'

To see a list of the tasks of a project, run gradle <project-path>:tasks
For example, try running gradle :dolphin:tasks

BUILD SUCCESSFUL

Total time: 0.683 secs
  • 一个多项目构建必须在根项目的根目录下包含settings.gradle文件，因为它指明了那些包含在多项目构建中的项目。
  • 如果需要在多项目构建的所有项目中加入公用的配置或行为，我们可以将这项配置加入到根项目的build.gradle文件中(使用allprojects)。
  • 如果需要在根项目的子项目中加入公用的配置或行为，我们可以将这项配置加入到根项目的build.gradle文件中(使用subprojects)。

常见问题

call ‘refresh’ before multicasting events via the context

启动Spring Boot程序时报如下错误：

** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.

详细日志如下：

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2017-02-03 18:32:33.444  WARN 15138 --- [           main] ionWarningsApplicationContextInitializer : 

** WARNING ** : Your ApplicationContext is unlikely to start due to a @ComponentScan of the default package.


2017-02-03 18:32:39.340  WARN 15138 --- [           main] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanDefinitionStoreException: Failed to parse configuration class [Application]; nested exception is org.springframework.context.annotation.ConflictingBeanDefinitionException: Annotation-specified bean name 'errorPageFilter' for bean class [org.springframework.boot.web.support.ErrorPageFilter] conflicts with existing, non-compatible bean definition of same name and class [org.springframework.boot.context.web.ErrorPageFilter]
2017-02-03 18:32:39.344 ERROR 15138 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exception

java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@51a9ad5e: startup date [Fri Feb 03 18:32:33 CST 2017]; root of context hierarchy
	at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:404) [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97) ~[spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253) ~[spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578) [spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554) [spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:959) [spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523) [spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:966) [spring-beans-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1033) [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:555) [spring-context-4.3.5.RELEASE.jar:4.3.5.RELEASE]
	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:371) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1186) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1175) [spring-boot-1.4.3.RELEASE.jar:1.4.3.RELEASE]
	at Application.main(Application.java:12) [main/:na]

是由于不能直接将application.java 文件放在main/java文件夹下，必须要新建一个包把他放进去。

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