Android Build with Gradle and ProGuard : "The output jar must be specified after an input jar, or it will be empty" -


i'm creating build different flavors gradle. used run quite until now, until wanted enable proguard. enabled minifyenabled release build , i'm having exception saying :

"caused by: org.gradle.internal.uncheckedexception: java.io.ioexception: output jar [.../app/build/intermediates/multi-dex/dev/release/componentclasses.jar] must specified after input jar, or empty."

does know causing exception ? want enable proguard before release application. here gradle file below.

lintoptions {     abortonerror false }  dexoptions{     incremental true     javamaxheapsize "4g" }  defaultconfig {         applicationid "..."         minsdkversion 14         targetsdkversion 22         versioncode 1         versionname "1.0"         multidexenabled true     }  buildtypes {      release {         minifyenabled true         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         signingconfig signingconfigs.release     }      debug {         minifyenabled false         shrinkresources false         proguardfiles getdefaultproguardfile('proguard-android.txt'), 'proguard-rules.pro'         signingconfig signingconfigs.debug     } }

proguard rules file.

# add project specific proguard rules here. # default, flags in file appended flags specified # in /users/osayilgan/development/android/sdk/tools/proguard/proguard-android.txt # can edit include path , order changing proguardfiles # directive in build.gradle. # # more details, see #   http://developer.android.com/guide/developing/tools/proguard.html  # add project specific keep options here:  # if project uses webview js, uncomment following # , specify qualified class name javascript interface # class: #-keepclassmembers class fqcn.of.javascript.interface.for.webview { #   public *; #}  -keepnames public class * extends io.realm.realmobject -keep class io.realm.** { *; } -dontwarn javax.** -dontwarn io.realm.**

and here proguard-android file. default 1 android sdk.

# configuration file proguard. # http://proguard.sourceforge.net/index.html#manual/usage.html  -dontusemixedcaseclassnames -dontskipnonpubliclibraryclasses -verbose  # optimization turned off default. dex not code run # through proguard optimize , preverify steps (and performs # of these optimizations on own). -dontoptimize -dontpreverify # note if want enable optimization, cannot # include optimization flags in own project configuration file; # instead need point # "proguard-android-optimize.txt" file instead of 1 # project.properties file.  -keepattributes *annotation* -keep public class com.google.vending.licensing.ilicensingservice -keep public class com.android.vending.licensing.ilicensingservice  # native methods, see http://proguard.sourceforge.net/manual/examples.html#native -keepclasseswithmembernames class * {     native <methods>; }  # keep setters in views animations can still work. # see http://proguard.sourceforge.net/manual/examples.html#beans -keepclassmembers public class * extends android.view.view {    void set*(***);    *** get*(); }  # want keep methods in activity used in xml attribute onclick -keepclassmembers class * extends android.app.activity {    public void *(android.view.view); }  # enumeration classes, see http://proguard.sourceforge.net/manual/examples.html#enumerations -keepclassmembers enum * {     public static **[] values();     public static ** valueof(java.lang.string); }  -keep class * implements android.os.parcelable {   public static final android.os.parcelable$creator *; }  -keepclassmembers class **.r$* {     public static <fields>; }  # support library contains references newer platform versions. # don't warn in case app linking against older # platform version.  know them, , safe. -dontwarn android.support.**

it took quite while me figure out but, had guessed, proguard configuration.

i started dig through warnings in console , realized of references couldn't found proguard. adding them -dontwarn proguard configuration file solved problem.

in case, had ignore packages below;

-dontwarn java.lang.invoke** -dontwarn org.apache.lang.** -dontwarn org.apache.commons.** -dontwarn com.nhaarman.** -dontwarn se.emilsjolander.**

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