groovy - 捕获IllegalStateException并停止我的Gradle/Groovy构建并打印一条消息？

Question

我有这个:

task buildNative(type: Exec) {
    try {
        if(System.getenv().NDK_HOME != null) {
            def ndkBuild = new File(System.getenv().NDK_HOME, 'ndk-build')
            workingDir "jni"
            executable ndkBuild
        } else {
            doLast {
                println 'Reason: NDK_HOME not set...'
            }
        }
    } catch(IllegalStateException){
        println 'Reason: NDK_HOME not set...'
    }
} 

而且由于我的环境中未设置NDK_HOME，所以我想停止构建并打印一条消息。我怎样才能做到这一点？

如果我用--stacktrace运行gradle assembleRelease我得到:

Caused by: java.lang.IllegalStateException: execCommand == null!

如果我使用gradle assembleRelease运行，则会得到:

* What went wrong:
Execution failed for task ':primavista-android-reloaded:buildNative'.
> execCommand == null!

我想要:

Reason: NDK_HOME not set...

并且即使我具有正确的NDK_HOME，它也无法在Android Studio中运行。与错误:

Execution failed for task ':primavista-android-reloaded:buildNative'.
> execCommand == null!

Answer 1

task buildNative(type: Exec) {
    if (System.getenv('NDK_HOME') != null) {
        def ndkBuild = new File(System.getenv('NDK_HOME'), 'ndk-build')
        workingDir "jni"
        executable ndkBuild
    } else {
        throw new GradleException('Reason: NDK_HOME not set...')
    }
}