D8:未找到类型"sun.misc.Unsafe"

Question

在我的android项目中启用D8后，我开始看到以下警告：

/Users/yashasvi/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/27.0.1-android/b7e1c37f66ef193796ccd7ea6e80c2b05426182d/guava-27.0.1-android.jar: D8: Type `sun.misc.Unsafe` was not found, it is required for default or static interface methods desugaring of `void com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper.<clinit>()`
/Users/yashasvi/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/27.0.1-android/b7e1c37f66ef193796ccd7ea6e80c2b05426182d/guava-27.0.1-android.jar: D8: Type `sun.misc.Unsafe` was not found, it is required for default or static interface methods desugaring of `sun.misc.Unsafe com.google.common.cache.Striped64.getUnsafe()`
/Users/yashasvi/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/27.0.1-android/b7e1c37f66ef193796ccd7ea6e80c2b05426182d/guava-27.0.1-android.jar: D8: Type `sun.misc.Unsafe` was not found, it is required for default or static interface methods desugaring of `sun.misc.Unsafe com.google.common.hash.LittleEndianByteArray$UnsafeByteArray.getUnsafe()`
/Users/yashasvi/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/27.0.1-android/b7e1c37f66ef193796ccd7ea6e80c2b05426182d/guava-27.0.1-android.jar: D8: Type `sun.misc.Unsafe` was not found, it is required for default or static interface methods desugaring of `void com.google.common.util.concurrent.AbstractFuture$UnsafeAtomicHelper.<clinit>()`
/Users/yashasvi/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/27.0.1-android/b7e1c37f66ef193796ccd7ea6e80c2b05426182d/guava-27.0.1-android.jar: D8: Type `sun.misc.Unsafe` was not found, it is required for default or static interface methods desugaring of `sun.misc.Unsafe com.google.common.cache.Striped64.getUnsafe()`
/Users/yashasvi/.gradle/caches/modules-2/files-2.1/com.google.guava/guava/27.0.1-android/b7e1c37f66ef193796ccd7ea6e80c2b05426182d/guava-27.0.1-android.jar: D8: Type `sun.misc.Unsafe` was not found, it is required for default or static interface methods desugaring of `sun.misc.Unsafe com.google.common.hash.LittleEndianByteArray$UnsafeByteArray.getUnsafe()`

项目成功构建，但在运行时，我看到了这些错误日志，因此，应用程序功能受到影响。

java.lang.AbstractMethodError: abstract method "java.lang.Object com.google.common.base.e.a(java.lang.Object)"
at com.google.common.e.a.i$c.a(SourceFile:1464)
at com.google.common.e.a.i$c.a(SourceFile:1453)
at com.google.common.e.a.i$a.run(SourceFile:1408)
at com.google.common.e.a.l$a.execute(SourceFile:456)
at com.google.common.e.a.i$f.a(SourceFile:153)
at com.google.common.e.a.i.a(SourceFile:1234)

经过一段时间的搜索，我没有找到任何有用的东西。请帮忙。

是的，如果D8被禁用，并且其他一切都保持不变，那么我在运行时就不会遇到这个错误。

Answer 1

您需要保留sun.misc.Unsafe:

-keep class sun.misc.Unsafe { *; }
-dontnote sun.misc.Unsafe

或者，具有includedescriptorclasses的规则应该动态地保持它：

-keep,includedescriptorclasses class com.google.common.**

一般来说：

• 添加开关-verbose对编写ProGuard配置规则非常有帮助。

• 添加开关-dontoptimize可用于禁用所有优化以进行测试。

刚刚发现：

R8现在了解META-INF/proguard中的proguard规格。

但除非添加了这一点，否则必须添加自定义规则，而不是使用消费者规则。

Answer 2

在您的项目proguard文件中。请添加以下内容：

-keepnames class com.google.common.**
-keep class com.google.common.**
-dontwarn com.google.common.**

这似乎是一种bug。但有时当您使用D8时，它倾向于重命名类名或完全删除它们。