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gradle build error while generating signed apk

I have created an app ready to be uploaded om playstore. I have created Keystore password and all when the gradle builds I get the following error. This is the first time I am uploading an app on playstore. Below are the error and the build.gradle file...Please help me!!Any other information regarding uploading app is very helpful
Error:
Information:Gradle tasks [:app:assembleRelease]
Warning:okhttp3.Address: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Authenticator: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Cache: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Cache$2: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Cache$CacheResponseBody: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Cache$Entry: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.CacheControl: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.CertificatePinner: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Challenge: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Connection: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.ConnectionPool: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.ConnectionSpec: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.ConnectionSpec$Builder: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Cookie: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Dispatcher: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.EventListener: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.FormBody: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Handshake: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Headers: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.HttpUrl: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.HttpUrl$Builder: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Interceptor$Chain: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.MediaType: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.MultipartBody: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.MultipartBody$Builder: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.MultipartBody$Part: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.OkHttpClient: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.OkHttpClient$Builder: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Request: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Request$Builder: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.RequestBody: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.RequestBody$1: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.RequestBody$2: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.RequestBody$3: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Response: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Response$Builder: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.ResponseBody: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.ResponseBody$1: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.Route: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.WebSocket: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.WebSocketListener: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.internal.Util: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.internal.cache.CacheStrategy: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.internal.cache.DiskLruCache: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.internal.cache.DiskLruCache$Snapshot: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.internal.connection.RealConnection: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.internal.http.RealResponseBody: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.internal.ws.RealWebSocket: can't find referenced class javax.annotation.Nullable
Warning:okhttp3.package-info: can't find referenced class javax.annotation.ParametersAreNonnullByDefault
Warning:okio.AsyncTimeout: can't find referenced class javax.annotation.Nullable
Warning:okio.Buffer: can't find referenced class javax.annotation.Nullable
Warning:okio.BufferedSource: can't find referenced class javax.annotation.Nullable
Warning:okio.ByteString: can't find referenced class javax.annotation.Nullable
Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.HashingSink: can't find referenced class javax.annotation.Nullable
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio$4: can't find referenced class javax.annotation.Nullable
Warning:okio.RealBufferedSource: can't find referenced class javax.annotation.Nullable
Warning:okio.Segment: can't find referenced class javax.annotation.Nullable
Warning:okio.SegmentPool: can't find referenced class javax.annotation.Nullable
Warning:okio.package-info: can't find referenced class javax.annotation.ParametersAreNonnullByDefault
Warning:there were 181 unresolved references to classes or interfaces.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> Job failed, see logs for details
Information:BUILD FAILED in 5m 31s
Information:1 error
Information:63 warnings
Information:See complete output in console
build.gradle(app)
apply plugin: 'com.android.application'
android {
compileSdkVersion 26
buildToolsVersion '26.0.2'
defaultConfig {
applicationId "com.abcd.efgh"
minSdkVersion 19
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation 'com.google.firebase:firebase-core:11.6.0'
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.readystatesoftware.systembartint:systembartint:1.0.3'
compile 'com.google.android.gms:play-services-ads:11.6.0'
compile 'com.wdullaer:materialdatetimepicker:3.4.0'
compile 'com.android.support:design:27.0.2'
compile 'com.android.support:appcompat-v7:27.0.2'
compile 'com.squareup.okhttp3:okhttp:3.9.0'
testCompile 'junit:junit:4.12'
}
apply plugin: 'com.google.gms.google-services'

You have minifyEnabled true for release and perhaps some needed classes for javax.annotation.Nullable are needed but are removed by minifying. If you don't need it for now you can just remove that tag for release. If you do need the flag you have to tinker and configure the minify to keep the class.

What this looks like to me is a transitive dependency issue. Just as you don't want to re-create the wheel and use gradle to import other code well the creaters of the gradle dependencies don't want to re-create the wheel ether so they used gradle too. You end up with nested dependencies that may not use the most recent version. In fact you even excluded group: 'com.android.support', module: 'support-annotations' in the androidtestcompile version to avoid a transitive dependency conflict. I feel your pain. I would go to the gradle tab and try running any task with dependency in the name. Its very verbose to track this type of error, the stack trace you listed will help. Running lint could also help clean up your code and as Yordan mentioned proguard is not required but it does add security by obfusicating the code

Databinding issues on building app for release

I'm trying to run an app ono release mode in my mobile. After click on run my message log is filled with these errors:
Warning:android.databinding.DataBindingUtil: can't find referenced class android.databinding.DataBinderMapper
Warning:android.databinding.DataBindingUtil: can't find referenced class android.databinding.DataBindingComponent
Warning:android.databinding.ViewDataBinding: can't find referenced class android.databinding.DataBinderMapper
Warning:android.databinding.ViewDataBinding: can't find referenced class android.databinding.DataBindingComponent
Warning:android.databinding.ViewDataBinding: can't find referenced class android.databinding.DataBinderMapper
Warning:android.databinding.ViewDataBinding: can't find referenced class android.databinding.DataBindingComponent
Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:there were 46 unresolved references to classes or interfaces.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForStageRelease'.
> Job failed, see logs for details
This is some part of my build.gradle
buildTypes {
release {
debuggable false
minifyEnabled true
zipAlignEnabled true
shrinkResources true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
signingConfig signingConfigs.bom
pseudoLocalesEnabled false
}
debug {
debuggable true
}
}
Inserting dataBinding{enabled true } in the release part the errors drops to about 3.
Information:Gradle tasks [:app:assembleStageRelease]
Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:there were 3 unresolved references to classes or interfaces.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForStageRelease'.
> Job failed, see logs for details
Is there a reason for this?

Your build is failing due to warnings from ProGuard. These aren't always blocking, and you can add a -dontwarn line to Proguard to get around them. The best thing to do is find which libraries the affected code is in, and find documentation from the library for what ProGuard rules are safe to add.

Android build error : Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'

I am new in using proguard and when I am building the api after creating signed api, I am getting these warnings and exceptions. I don't know how to solve it.
Here's the Error Log :
Warning:okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio: can't find referenced class java.nio.file.Files
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class java.nio.file.Path
Warning:okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning:okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandles$Lookup
Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandle
Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandles
Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandle
Warning:retrofit2.Platform$Java8: can't find referenced class java.lang.invoke.MethodHandles$Lookup
Warning:retrofit2.Platform$Java8: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning:rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.ConcurrentCircularArrayQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.ConcurrentSequencedCircularArrayQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.MpmcArrayQueueConsumerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.MpmcArrayQueueProducerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.MpscLinkedQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpmcArrayQueueConsumerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpmcArrayQueueProducerField: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpscArrayQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.SpscUnboundedArrayQueue: can't find referenced class sun.misc.Unsafe
Warning:rx.internal.util.unsafe.UnsafeAccess: can't find referenced class sun.misc.Unsafe
Warning:there were 66 unresolved references to classes or interfaces.
Warning:Exception while processing task java.io.IOException: Please correct the above warnings first.
Error:Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
> Job failed, see logs for details
and my gradle looks like this:
android {
compileSdkVersion 25
buildToolsVersion "25.0.2"
defaultConfig {
minSdkVersion 18
targetSdkVersion 25
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
packagingOptions {
exclude 'LICENSE.txt'
}
lintOptions {
abortOnError false
}
useLibrary 'org.apache.http.legacy'
multiDexEnabled true
}
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
testOptions {
unitTests.returnDefaultValues = true
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
exclude group: 'com.android.support', module: 'support-annotations'
})
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support.constraint:constraint-layout:1.0.2'
testCompile 'junit:junit:4.12'
compile 'com.squareup.retrofit2:converter-scalars:2.1.0'
compile 'com.android.support:support-annotations:25.3.1'
compile 'com.squareup.retrofit2:retrofit:2.0.1'
compile "com.squareup.retrofit2:adapter-rxjava:2.1.0"
compile 'com.google.code.gson:gson:2.6.1'
compile 'com.squareup.retrofit2:converter-gson:2.1.0'
compile 'io.reactivex:rxandroid:1.2.1'
compile 'io.reactivex:rxjava:1.1.6'
}
I don't know how to solve the error. I want to use proguard to reduce the size. Any help would be appreciated.

You need to add those lines to your proguard-rules.pro file:
# exclusions for Okio
-dontwarn okio.**
# exclusions for Retrofit
-dontnote retrofit2.Platform
-dontwarn retrofit2.Platform$Java8
-keepattributes Signature
-keepattributes Exceptions
# exclusions for RxJava
-keepclassmembers class rx.internal.util.unsafe.*ArrayQueue*Field* {
long producerIndex;
long consumerIndex;
}
-keepclassmembers class rx.internal.util.unsafe.BaseLinkedQueueProducerNodeRef {
rx.internal.util.atomic.LinkedQueueNode producerNode;
}
-keepclassmembers class rx.internal.util.unsafe.BaseLinkedQueueConsumerNodeRef {
rx.internal.util.atomic.LinkedQueueNode consumerNode;
}
-dontwarn sun.misc.Unsafe
Dont' forget to load the correct file during the release build
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}

Android-Studio-1.2.RC Proguard warnings on Square's Okio library reference

WIth Android Studio: 1.2.RC
I enabled proguard in .gradle:
```
minifyEnabled=true
and added these rules to my proguard-rules.pro:
-dontwarn com.squareup.**
-dontwarn okio.**
and added these lint rules to my .gradle file:
warningsAsErrors false
abortOnError false
disable 'InvalidPackage'
```
But I still get these warning when I try to run the app in debug mode:
```
Warning: okio.DeflaterSink: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning: okio.Okio: can't find referenced class java.nio.file.Files
Warning: okio.Okio: can't find referenced class java.nio.file.Files
Warning: okio.Okio: can't find referenced class java.nio.file.Files
Warning: okio.Okio: can't find referenced class java.nio.file.Path
Warning: okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning: okio.Okio: can't find referenced class java.nio.file.Path
Warning: okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning: okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning: okio.Okio: can't find referenced class java.nio.file.Path
Warning: okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning: okio.Okio: can't find referenced class java.nio.file.Path
Warning: okio.Okio: can't find referenced class java.nio.file.OpenOption
Warning: okio.Okio: can't find referenced class org.codehaus.mojo.animal_sniffer.IgnoreJRERequirement
Warning: there were 14 unresolved references to classes or interfaces.
You may need to add missing library jars or update their versions.
If your code works fine without the missing classes, you can suppress
the warnings with '-dontwarn' options.
(http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
:app:proguardDebug FAILED
```
It's so weird since I also added these rules/options to all my library modules that depend on OkHttp/Picasso, I don't know where went wrong, perhaps this is a Android Studio bug ? Does anyone have any clues to this problem ?
I have opened an issue on github.

You've disable warnings for
-dontwarn com.squareup.**
-dontwarn okio.**
But what about for packages (as seen in your posted log)
-dontwarn org.codehaus
-dontwarn java.nio
Either way, ignoring warnings is not a good approach.
Try keeping these classes from being minified like so:
-keep public class org.codehaus.**
-keep public class java.nio.**

Oh Christ, I forgot to specify the proguard file for my debug build, adding the 'proguardFiles' rule would solve the problem:
buildTypes {
release {
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
debug {
debuggable false
minifyEnabled true
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
applicationIdSuffix ".debug"
}
}
One of those moments you searched hard for your keys and it's right in your pocket.

Issue building apk file

I am working with an Application where I enabled runProguard true in my build.gradle file of my app. When I go for building signed apk I am getting warnings and build process failed.
Log File:
Warning:com.google.common.base.Absent: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Ascii: can't find referenced class javax.annotation.CheckReturnValue
Warning:com.google.common.base.CaseFormat$StringConverter: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.CharMatcher: can't find referenced class javax.annotation.CheckReturnValue
Warning:com.google.common.base.Converter: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Converter$ConverterComposition: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Converter$FunctionBasedConverter: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Converter$ReverseConverter: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Defaults: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Enums$StringConverter: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Equivalence: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Equivalence$EquivalentToPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Equivalence$Wrapper: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.FinalizableReferenceQueue$FinalizerLoader: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Function: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.FunctionalEquivalence: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions$ConstantFunction: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions$ForMapWithDefault: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions$FunctionComposition: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions$FunctionForMapNoDefault: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions$IdentityFunction: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions$PredicateFunction: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Functions$SupplierFunction: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Joiner: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Joiner: can't find referenced class javax.annotation.CheckReturnValue
Warning:com.google.common.base.Joiner$1: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Joiner$MapJoiner: can't find referenced class javax.annotation.CheckReturnValue
Warning:com.google.common.base.MoreObjects: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.MoreObjects$ToStringHelper: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Objects: can't find referenced class javax.annotation.CheckReturnValue
Warning:com.google.common.base.Objects: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Objects$ToStringHelper: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Optional: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.PairwiseEquivalence: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Preconditions: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$AndPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$AssignableFromPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$CompositionPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$ContainsPatternPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$InPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$InstanceOfPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$IsEqualToPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$NotPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$ObjectPredicate$1: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$ObjectPredicate$2: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$ObjectPredicate$3: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$ObjectPredicate$4: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Predicates$OrPredicate: can't find referenced class javax.annotation.Nullable
Warning:com.google.common.base.Present: can't find referenced class javax.annotation.Nullable
build.gradle
apply plugin: 'com.android.application'
android {
signingConfigs {
}
compileSdkVersion 21
buildToolsVersion '20.0.0'
defaultConfig {
minSdkVersion 15
targetSdkVersion 21
versionCode 1
versionName '1.0'
}
buildTypes {
release {
runProguard true
proguardFiles getDefaultProguardFile('proguard-android.txt'),
'proguard-rules.pro'
}
}
productFlavors {
}
packagingOptions {
exclude 'META-INF/LICENSE.txt'
exclude 'META-INF/NOTICE.txt'
}
}
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.google.guava:guava:18.0'
compile 'com.google.code.gson:gson:2.3'
compile 'com.microsoft.azure:azure-mobile-services-android-sdk:2.0.2-beta+'
compile (group: 'com.microsoft.azure', name: 'azure-notifications-handler', version: '1.0.1', ext: 'jar')
compile project(':library')
compile project(':StyleableDateTimePicker-master')
compile 'com.facebook.android:facebook-android-sdk:3.23.+'
compile 'com.android.support:support-v4:22.0.0+'
compile 'com.android.support:appcompat-v7:22.0.0'
compile 'com.google.android.gms:play-services:6.5.87'
compile 'com.github.navasmdc:MaterialDesign:1.+#aar'
compile 'com.android.support:recyclerview-v7:21.0.0'
compile 'com.android.support:cardview-v7:21.0.+'
compile 'com.melnykov:floatingactionbutton:1.1.0'
compile 'com.ToxicBakery.viewpager.transforms:view-pager-transforms:1.1.0#aar'
compile 'de.hdodenhof:circleimageview:1.2.2'
compile 'com.github.alamkanak:android-week-view:1.2.1'
compile('ch.acra:acra:4.5.0') {
exclude group: 'org.json'
}
compile 'com.github.machinarius:preferencefragment:0.1.1'
}

I think I finally figured this one out!
gradle dependency:
dependencies {
...
compile 'com.google.guava:guava:18.0'
/* Required for using guava with proguard */
compile 'javax.annotation:jsr250-api:1.0'
}
Additions to my proguard configuration:
##-------------Begin Settings For Guava ------------------------------------------------------------
#https://github.com/krschultz/android-proguard-snippets/blob/master/libraries/proguard-guava.pro
# Configuration for Guava
#
# disagrees with instructions provided by Guava project: https://code.google.com/p/guava-libraries/wiki/UsingProGuardWithGuava
#
# works if you add the following line to the Gradle dependencies
#
# provided 'javax.annotation:jsr250-api:1.0'
-keep class com.google.common.io.Resources {
public static <methods>;
}
-keep class com.google.common.collect.Lists {
public static ** reverse(**);
}
-keep class com.google.common.base.Charsets {
public static <fields>;
}
-keep class com.google.common.base.Joiner {
public static Joiner on(String);
public ** join(...);
}
-keep class com.google.common.collect.MapMakerInternalMap$ReferenceEntry
-keep class com.google.common.cache.LocalCache$ReferenceEntry
-dontwarn sun.misc.Unsafe
-dontwarn javax.annotation.**
##-------------End Settings For Guava --------------------------------------------------------------
Links Which Helped Me
https://github.com/krschultz/android-proguard-snippets/blob/master/libraries/proguard-guava.pro
https://github.com/krschultz/android-proguard-snippets/issues/53

You can't use proguard anymore, you need use
minifyEnabled false