java - ProGuard 错误 : The output jar is empty. 您是否指定了正确的 '-keep' 选项？

Question

我正在像这样从命令行使用 ProGuard:

java -jar $PRO_GUARD_HOME/proguard.jar @proguard-rules.pro > usage.log

这是我的 proguard-rules.pro 规则文件:

-injars build/libs/test-main-1.0.jar
-libraryjars /System/Library/Frameworks/JavaVM.framework/Classes/classes.jar


-dontoptimize
-dontobfuscate
-dontpreverify
-printusage
-dontnote

-keep public class com.foo.app.Main {
    public static void main(java.lang.String[]);
}

-keepclassmembers class * {
    static final % *;
    static final java.lang.String *;
}

当我运行上面的命令时，出现以下错误:

Error: The output jar is empty. Did you specify the proper '-keep' options?

如何解决这个错误？

Answer 1

不要压缩库文件。这对我有用；

    # Keep - Library. Keep all public and protected classes, fields, and methods.
-keep public class * {
    public protected <fields>;
    public protected <methods>;
}