使用 Jack 时未生成 Dagger 2 组件 [英] Dagger 2 components not generated when using Jack

问题描述

当我在 Android Studio 2.2 中启用 Jack 编译器时，Dagger 2 组件未生成.Dagger 2 可以与 Jack 一起使用吗?如果是这样，我将如何配置我的应用程序?

When I enable the Jack compiler in Android Studio 2.2 the Dagger 2 component is not generated. Can Dagger 2 be used with Jack? If so, how would I go about configuring my application?

从我的应用程序的build.gradle:

jackOptions {
     enabled true
   }

 compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
}

推荐答案

我花了 2 天时间才弄清楚这个问题.所以我回过头来在这里发布调查结果，以防它节省一些时间:

I sunk like 2 days into figuring this out. So I'm circling back to posting the findings here in case it saves someone time:

这是由 杰克中阻止类路径工作的错误引起的正确.它与 Jack 在进程内"运行(与 gradle 守护进程在同一个 JVM 中)有关.将 android.defaultConfig.jackOptions.jackInProcess 设置为 false 确实超出了前提条件"错误，但会导致其他问题(2 个 JVM 占用系统资源)&错误破坏其他构建(更糟)方式.

This is caused by a bug in Jack that prevents classpaths from working properly. It has to do with Jack running "in-process" (in the same JVM as the gradle daemon). Setting android.defaultConfig.jackOptions.jackInProcess to false does get beyond the "Preconditions" error but it causes other problems (2 JVMs that hog system resources) & bugs that break the build in other (worse) ways.

目前，最好的解决方案似乎是:

• 等待 Android gradle 插件的 2.3 版发布，该插件已经对此进行了修复.
• 同时将 Dagger 降级到 v2.2.
  似乎是避免了 Guava 与 Jack 冲突的最高版本.

2017 年 1 月 14 日更新:
我和 Jack 一起遇到了其他几个问题，我已经厌倦了，所以我转向了 retrolambda，并因为没有早点这样做而自责！现在，Jack 造成的问题似乎比它解决的问题还多.只需添加带加号的行并删除带减号的行，您就可以返回 Dagger 2.8，同时等待 Jack 开始行动！

update 1/14/2017:
I ran into several OTHER problems with Jack and got so tired of it that I switched to retrolambda and kicked myself for not doing this earlier! Right now, Jack simply seems to cause more problems than it solves. Just add the lines with a plus and delete the lines with a minus and you can return to Dagger 2.8 while waiting for Jack to get it's act together!

+plugins {
+    id "me.tatarka.retrolambda" version "3.4.0"
+}

 apply plugin: 'com.android.application'
+apply plugin: 'me.tatarka.retrolambda'

-        jackOptions {
-            enabled true
-        }

为了更快地构建retrolambda，请将org.gradle.jvmargs=-Xmx4608M 添加到您的gradle.properties 文件中，以便在进程中进行dexing.现在，我使用的是 Dagger 2.8，我的干净构建只有 12 秒，好问题，JACK！

For even faster retrolambda builds, add org.gradle.jvmargs=-Xmx4608M to your gradle.properties file so that dexing can happen in-process. Now, I'm on Dagger 2.8 and my clean builds are only 12 seconds, GOOD RIDDANCE, JACK!

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