java - How to tell proguard to keep enum constants and fields

Question

I've try obfuscate our web application which use spring, jaxb and relies on annotations, and reflection heavily. I apply many recipes found in internet to keep some classes, attributes, annotations and enumerations. But with enumerations still have problem. I've able preserve enum constants apply configuration from http://proguard.sourceforge.net/manual/examples.html#enumerations:

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

At first glance it looks like working solution and constant preserved, so (Class.getEnumConstants()) return correct list of values. But I got NoSuchFieldException when I try retrieve field by any of that by name.

Problem come from jaxb reflection navigator, please look at code:

public Field[] getEnumConstants(Class clazz) {
    try {
        Object[] values = clazz.getEnumConstants();
        Field[] fields = new Field[values.length];
        for (int i = 0; i < values.length; i++) {
            fields[i] = clazz.getField(((Enum) values[i]).name());
        }
        return fields;
    } catch (NoSuchFieldException e) {
        // impossible
        throw new NoSuchFieldError(e.getMessage());
    }
}

I fall exactly into "impossible" branch. I think it will be easy understandable to look at debug session screenshot (there also listed constants):

And if I try obtain fields, they are listed obfuscated as a, b, c, d, e, f:

My proguard configuration now look like (strip out some library listing and kipp particular classes, fields and methods about proguard complain):

-injars  core-3.15.rc5.6.jar
-outjars core-3.15.rc5.6.proguard.jar

-libraryjars <java.home>/lib/rt.jar

-libraryjars ... # Other libs listed, strip out for shortness

-printmapping core-3.15.rc5.6.proguard.map

-keep public class ru.rlh.egais.portal.backend.controller.rest.**
-keep public class ru.rlh.egais.portal.backend.integration.soap.service.**

# http://midgetontoes.com/blog/2015/06/26/tips-for-using-proguard-with-spring-framework
-optimizations !class/marking/final

-adaptresourcefilecontents **.properties,META-INF/MANIFEST.MF,META-INF/spring.*,spring/*

-keepattributes Exceptions,InnerClasses,Signature,Deprecated,SourceFile,LineNumberTable,*Annotation*,EnclosingMethod
# Also tried:
# -keepattributes **

-allowaccessmodification
-dontshrink
-dontoptimize
-dontusemixedcaseclassnames
-keepdirectories
-keep @org.springframework.transaction.annotation.Transactional class *
-keep @org.springframework.stereotype.Service class *
-keep @org.springframework.stereotype.Repository class *
-keep @org.springframework.stereotype.Controller class *
-keep @org.springframework.stereotype.Component class *
-keep @org.springframework.beans.factory.annotation.Autowired class *
-keep @org.springframework.web.bind.annotation.ResponseBody class *
-keep @org.springframework.web.bind.annotation.RequestMapping class *
-keep @org.springframework.stereotype.Repository class *
-keep @javax.annotation.Resource class *
-keep @org.springframework.cache.annotation.EnableCaching class *
-keep @org.springframework.context.annotation.Configuration class *

-keepclassmembers class * {
    @org.springframework.beans.factory.annotation.* *;
    @org.springframework.beans.factory.annotation.Qualifier *;
    @org.springframework.beans.factory.annotation.Value *;
    @org.springframework.beans.factory.annotation.Required *;
    @org.springframework.context.annotation.Bean *;
    @javax.annotation.PostConstruct *;
    @javax.annotation.PreDestroy *;
    @org.aspectj.lang.annotation.AfterReturning *;
    @org.aspectj.lang.annotation.Pointcut *;
    @org.aspectj.lang.annotation.AfterThrowing *;
    @org.aspectj.lang.annotation.Around *;
}

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

So, my question how I could fully keep public enums from obfuscation? In both cases - use its constants (class.getEnumConstants()) and fields (class.getFields()).

Answer 1

Thanks to http://sourceforge.net/p/proguard/discussion/182455/thread/1c28f199/ I found solution for my question (<?fields> must be added):

-keepclassmembers class * extends java.lang.Enum {
    <fields>;
    public static **[] values();
    public static ** valueOf(java.lang.String);
}