Question

It so fell out that I use jacorb.jar and CORBA interfaces in my android app. And when I try obfuscate code using Proguard I get a lot of warnings like this one:

    [proguard] Warning: org.jacorb.orb.standardInterceptors.SASComponentInterceptor: can't find referenced
class org.ietf.jgss.Oid

And as the result:

 [proguard] Warning: there were 1223 unresolved references to classes or interfaces.
 [proguard]          You may need to specify additional library jars (using '-libraryjars'),
 [proguard]          or perhaps the '-dontskipnonpubliclibraryclasses' option.
 [proguard] Warning: there were 33 unresolved references to program class member
s.
 [proguard]          Your input classes appear to be inconsistent.
 [proguard]          You may need to recompile them and try again.
 [proguard]          Alternatively, you may have to specify the options
 [proguard]          '-dontskipnonpubliclibraryclasses' and/or
 [proguard]          '-dontskipnonpubliclibraryclassmembers'.

My proguard.cfg :

-injars      bin/classes
-outjars     bin/classes-processed.jar
-libraryjars C:/android-sdk-windows/platforms/android-7/android.jar
-libraryjars libs

-dontpreverify
-repackageclasses ''
-allowaccessmodification
-optimizations !code/simplification/arithmetic
-keepattributes *Annotation*
-dontskipnonpubliclibraryclasses
-dontskipnonpubliclibraryclassmembers
-dontnote

-keep class com.android.vending.billing.**

-keep public class * extends android.app.Activity
-keep public class * extends android.app.Application
-keep public class * extends android.app.Service
-keep public class * extends android.content.BroadcastReceiver
-keep public class * extends android.content.ContentProvider

-keep public class * extends android.view.View {
    public <init>(android.content.Context);
    public <init>(android.content.Context, android.util.AttributeSet);
    public <init>(android.content.Context, android.util.AttributeSet, int);
    public void set*(...);
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet);
}

-keepclasseswithmembers class * {
    public <init>(android.content.Context, android.util.AttributeSet, int);
}

-keepclassmembers class * implements android.os.Parcelable {
    static android.os.Parcelable$Creator CREATOR;
}

-keepclassmembers class **.R$* {
    public static <fields>;
}

How to correct these warnings and build working apk file?

Answer 1

Cfr. ProGuard manual > Troubleshooting > Warning: can’t find superclass or interface.

Jacorb appears to depend on JGSS, which is not part of the Android runtime. In theory, JGSS should be specified as a library package. However, since your app already runs fine without JGSS, it’s fair to assume that this part of the code is never used. You can then switch off the warnings:

-dontwarn org.ietf.jgss.**

ProGuard will no longer complain about these missing classes and proceed with processing the code. The summary in your console output suggests that there are many classes that are probably similar.