Annotation processors must be explicitly declared now.Please add them to the annotationProcessor con

Error:Execution failed for task ':app:javaPreCompilePreProductDebug'.
> Annotation processors must be explicitly declared now.  The following dependencies on the compile classpath are found to contain annotation processor.  Please add them to the annotationProcessor configuration.
    - butterknife-7.0.1.jar (butterknife-7.0.1.jar)
  Alternatively, set android.defaultConfig.javaCompileOptions.annotationProcessorOptions.includeCompileClasspath = true to continue with previous behavior.  Note that this option is deprecated and will be removed in the future.
  See https://developer.android.com/r/tools/annotation-processor-error-message.html for more details.

体验新版AndroidStudio 3，发现之前项目的butter knife报错，用到注解的应该都会报错

修复方案

android {
    //...
    defaultConfig {
        //...
        javaCompileOptions {
            annotationProcessorOptions {
                includeCompileClasspath true
            }
        }
    }
}