ProGuard Android - JDBC錯誤 - 空指針異常

Question

我想用Proguard來混淆我的Android應用程序。但是我遇到了一個奇怪的問題，我希望你們中的一個能夠幫助我。

-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* 

所以，你可以看到我已經添加了mysql JDBC庫作爲庫文件和類應該保留。但是，當我嘗試將該項目編譯爲.apk文件時，我終於遇到了這個奇怪的錯誤。根據我的配置，我不知道爲什麼它甚至不應該被觸及。

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

通過將Proguard更新爲新的5.0版來修復。