I run my ProGuard for my Android project and get the following warnings:
Note: duplicate definition of library class [org.apache.http.conn.scheme.HostNameResolver]
Note: duplicate definition of library class [org.apache.http.conn.scheme.SocketFactory]
Note: duplicate definition of library class [org.apache.http.conn.ConnectTimeoutException]
Note: duplicate definition of library class [org.apache.http.params.HttpParams]
Note: duplicate definition of library class [android.net.http.SslCertificate$DName]
Note: duplicate definition of library class [android.net.http.SslError]
Note: duplicate definition of library class [android.net.http.SslCertificate]
Note: there were 7 duplicate class definitions.
I found here to fix this with ignoring it with:
-keep class org.apache.http.** { *; }
-dontwarn org.apache.http.**
-keep class android.net.http.** { *; }
-dontwarn android.net.http.**
I do not see a way to remove the duplicates from the used libraries. Even after using dontwarn
the warnings do not vanish.
Is this the right way of handling this warning in just ignoring it or could this lead to problems?
If you add a proguard option -printconfiguration config.txt
you'll see proguard adds
-libraryjars 'D:\tools\android\platforms\android-23\android.jar'
-libraryjars 'D:\tools\android\platforms\android-23\optional\org.apache.http.legacy.jar'
your duplicated classes (e.g. SslError) are presented in both android.jar and org.apache.http.legacy.jar
Proguard adds second jar even if you don't useLibrary 'org.apache.http.legacy'
Here is an open bug describing the problem.
So now we can't do anything with the issue. Just ignore it:
-dontnote android.net.http.*
-dontnote org.apache.commons.codec.**
-dontnote org.apache.http.**
There is no need to keep the classes as long as they are located in library jar (phone's library actually). dontwarn doesn't work because it's not a warning, it's a note.