java - Proguard won't keep a class member's enums

Question

I'm working on a library that is distributed as a java jar, and I'm running proguard on it in such a way as to only leave the required interfaces exposed. I have a configuration class with a bunch of member variables and some enum defines. My proguard script preserves the member variables fine, however, the enum definitions are being obfuscated. I've tried everything I can think of to force proguard to retain these internally defined and public enums, but I can't get it to work.

Right now I'm using:

-keep public class com.stuff.MyConfigObject {
    public *;
}

-keepclassmembers enum * {
    public static **[] values();
    public static ** valueOf(java.lang.String);
}

If I try:

-keep public enum com.stuff.MyConfigObject.MyEnum

I get an ambiguous error: "Note: the configuration refers to the unknown class 'com.stuff.MyConfigObject.MyEnum'"

Thanks for the help!

Answer 1

Try com.stuff.MyConfigObject$MyEnum instead. The Proguard class specification expects $ as the separator for inner classes.

Actually, for what you want maybe the best option is something like this:

-keep public enum com.stuff.MyConfigObject$** {
    **[] $VALUES;
    public *;
}

This will keep only the required members for all enums nested within MyConfigObject - the required members being the $VALUES[] array (see this question for an explanation) and any public members of the enum. Any other members (e.g. private fields methods) will not be kept.

---

As noted by Jesse and myself in the comments - since you are processing a library, you must also add the -keepAttributes option. From the reference guide:

For example, you should at least keep the Exceptions, InnerClasses, and Signature attributes when processing a library.