gradle 打包出现Jack is disabled, but one of the plugins you are using supports Java 8 language features.

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1、

Jack is disabled, but one of the plugins you are using supports Java 8 language features.

解决办法：在build.gradle(app)里增加

jackOptions {
            enabled true
         }

defaultConfig {
        applicationId "com.hotbitmapgg.ohmybilibili"
        minSdkVersion 21
        targetSdkVersion 25
        versionCode props.getAt("versionCode") as int
        versionName props['versionName']
        jackOptions {
            enabled true
         }

    }

2、之后出现的Cannot get property 'destinationDir' on null object

解决办法：注掉build.gradle(app)中的“apply plugin: 'me.tatarka.retrolambda'”