build.gradle

apply plugin: 'groovy'

repositories {
    mavenCentral()
}

configurations {
    patch
    [compile, testCompile]*.exclude module: 'jersey-server'
}

dependencies {
    compile('com.yammer.dropwizard:dropwizard-core:0.6.2')
    compile('com.sun.jersey:jersey-client:1.17.1')
    compile files('lib/jersey-server-1.17.1.patched.jar')

    compile('org.codehaus.groovy:groovy-all:2.1.3')
    compile('com.google.inject:guice:4.0-beta')
    compile('org.pegdown:pegdown:1.4.1')

    patch('com.sun.jersey:jersey-server:1.17.1')
    patch('asm:asm:3.1')
    patch('com.googlecode.jarjar:jarjar:1.3')
}

project.ext.set("shouldBuildPatch", { !new File('lib/jersey-server-1.17.1.patched.jar').exists() })

task downloadPatchLibs(type: Copy) {
    into('lib')
    from(configurations.patch)
    exclude('jarjar*')
    duplicatesStrategy(DuplicatesStrategy.EXCLUDE)
}
downloadPatchLibs.doFirst {
    if(!shouldBuildPatch()) { throw new StopExecutionException() }
}

task applyPatch(dependsOn: 'downloadPatchLibs') << {
    if (shouldBuildPatch()) {
        project.ant {
            taskdef name: "jarjar", classname: "com.tonicsystems.jarjar.JarJarTask", classpath: configurations.patch.asPath
            jarjar(jarfile: 'lib/jersey-server-1.17.1.patched.jar', filesetmanifest: "merge") {
                zipfileset(src: 'lib/jersey-server-1.17.1.jar')
                zipfileset(src: 'lib/asm-3.1.jar')
                rule pattern: "org.objectweb.asm.**", result: "org.objectweb.asm3.@1"
            }
        }
    }
}

task cleanupDownloadPatchLibs(type: Delete, dependsOn: 'applyPatch') {
    delete 'lib/jersey-server-1.17.1.jar'
    delete 'lib/asm-3.1.jar'
}
compileGroovy.dependsOn(cleanupDownloadPatchLibs)

task cleanPatch(type: Delete) {
    delete 'lib'
}
clean.dependsOn(cleanPatch)