专业卫士错误：输出 jar 为空。您是否指定了正确的'-keep'选项？

Question

我从命令行使用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，我得到以下错误:

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

如何解决这个错误?

Answer 1

不要收缩库文件。

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