Chapter 26. The War Plugin

To use the War plugin, include the following in your build script:

apply plugin: 'war'

The War plugin adds the following tasks to the project.

The War plugin adds the following dependencies to tasks added by the Java plugin.

Figure 26.1. War plugin - tasks

The War plugin adds two dependency configurations named providedCompile and providedRuntime. Those two configurations have the same scope as the respective compile and runtime configurations, except that they are not added to the WAR archive. It is important to note that those provided configurations work transitively. Let's say you add commons-httpclient:commons-httpclient:3.0 to any of the provided configurations. This dependency has a dependency on commons-codec. Because this is a “provided” configuration, this means that neither of these dependencies will be added to your WAR, even if the commons-codec library is an explicit dependency of your compile configuration. If you don't want this transitive behavior, simply declare your provided dependencies like commons-httpclient:commons-httpclient:3.0@jar.

These properties are provided by a WarPluginConvention convention object.

The default behavior of the War task is to copy the content of src/main/webapp to the root of the archive. Your webapp directory may of course contain a WEB-INF sub-directory, which may contain a web.xml file. Your compiled classes are compiled to WEB-INF/classes. All the dependencies of the runtime ^[13] configuration are copied to WEB-INF/lib.

The War class in the API documentation has additional useful information.

Here is an example with the most important customization options:

configurations {
   moreLibs
}

repositories {
   flatDir { dirs "lib" }
   mavenCentral()
}

dependencies {
    compile module(":compile:1.0") {
        dependency ":compile-transitive-1.0@jar"
        dependency ":providedCompile-transitive:1.0@jar"
    }
    providedCompile "javax.servlet:servlet-api:2.5"
    providedCompile module(":providedCompile:1.0") {
        dependency ":providedCompile-transitive:1.0@jar"
    }
    runtime ":runtime:1.0"
    providedRuntime ":providedRuntime:1.0@jar"
    testCompile "junit:junit:4.11"
    moreLibs ":otherLib:1.0"
}

war {
    from 'src/rootContent' // adds a file-set to the root of the archive
    webInf { from 'src/additionalWebInf' } // adds a file-set to the WEB-INF dir.
    classpath fileTree('additionalLibs') // adds a file-set to the WEB-INF/lib dir.
    classpath configurations.moreLibs // adds a configuration to the WEB-INF/lib dir.
    webXml = file('src/someWeb.xml') // copies a file to WEB-INF/web.xml
}

Of course one can configure the different file-sets with a closure to define excludes and includes.