AS使用lombok注解报错：Annotation processors must be explicitly declared now. The following dependencies on the compile classpath are found to contain annotation processor.

Rebuild时报错信息如下所示：

Error:Execution failed for task ‘:app:javaPreCompileDebug‘.
> 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.
- lombok-1.16.20.jar (org.projectlombok:lombok:1.16.20)
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.

在app的build中
android {
    ...
    defaultConfig {
        ...
        //添加如下配置就OK了
        javaCompileOptions { annotationProcessorOptions { includeCompileClasspath = true } }
    }
    ...
}

原文地址：https://www.cnblogs.com/jeffen/p/9008415.html