ProGuard错误：输出jar为空。你有没有指定正确的＆＃39; -keep＆＃39;选择？

Question

我在命令行中使用ProGuard，如下所示：

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

以下是我的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，我收到以下错误：

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

如何解决此错误？

Answer 1

不要缩小库文件。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>;
}