ProGuard Android - JDBC 错误 - NullPointerException

Question

我正在尝试使用 Proguard 混淆我的 Android 应用程序。但是我遇到了一个奇怪的问题，希望你们中的一个能够帮助我。

-keep class android.support.v4.** { *; }
-keep public class com.mysql.** {*;}  
-keep class com.actionbarsherlock.** {*;} 
-dontwarn android.support.v4.**
-dontwarn com.mysql.**
-libraryjars /libs/mysql-connector-java-5.1.27-bin.jar
-dontshrink
-keepattributes *Annotation*

如您所见，我已经将 mysql JDBC 库添加为库和应保留的类。但是当我尝试将项目编译为 .apk 文件时，我遇到了这个奇怪的错误。我不知道为什么，根据我的配置，它甚至不应该被触摸。

Proguard returned with error code 1. See console
Note: there were 508 duplicate class definitions.
You should check if you need to specify additional program jars.
Unexpected error while evaluating instruction:
Class       = [com/mysql/jdbc/ConnectionImpl]
Method      = [isReadOnly(Z)Z]
Instruction = [77] iload v4
Exception   = [java.lang.NullPointerException] (null)
Unexpected error while performing partial evaluation:
Class       = [com/mysql/jdbc/ConnectionImpl]
Method      = [isReadOnly(Z)Z]
Exception   = [java.lang.NullPointerException] (null)
Error: null

Answer 1

已通过将 Proguard 更新到新的 5.0 版本来修复。