android - Gradle failed to build when proguard is activated

Question

I am trying to release my Android application with Gradle.

Everything works, including the ./gradlew clean build assembleRelease command.

However, as soon as I try to use proguard, Gradle fail to build the release version.

Here is the error I get (stack trace activated):

...
:OSkin:validateDebugSigning
:OSkin:packageDebug
:OSkin:assembleDebug
:OSkin:prepareReleaseDependencies
:OSkin:compileReleaseAidl
:OSkin:generateReleaseBuildConfig
:OSkin:mergeReleaseAssets
:OSkin:compileReleaseRenderscript
:OSkin:mergeReleaseResources
:OSkin:processReleaseManifest
:OSkin:processReleaseResources
:OSkin:compileRelease UP-TO-DATE
:OSkin:proguardRelease
ProGuard, version 4.9
Reading input...
Reading program directory [/home/geantvert/workspace/OSkinProject/OSkin/build/classes/release]
:OSkin:proguardRelease FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':OSkin:proguardRelease'.
> Can't read [/home/geantvert/workspace/OSkinProject/OSkin/build/classes/release] (No such file or directory)

* Try:
Run with --info or --debug option to get more log output.

* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':OSkin:proguardRelease'.
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:69)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:46)
    at org.gradle.api.internal.tasks.execution.PostExecutionAnalysisTaskExecuter.execute(PostExecutionAnalysisTaskExecuter.java:35)
    at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62)
    at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58)
    at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:42)
    at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52)
    at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:53)
    at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
    at org.gradle.api.internal.AbstractTask.executeWithoutThrowingTaskFailure(AbstractTask.java:286)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:80)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:66)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTaskWithCacheLock(AbstractTaskPlanExecutor.java:58)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:47)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$1.run(DefaultTaskPlanExecutor.java:33)
    at org.gradle.internal.Factories$1.create(Factories.java:22)
    at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:214)
    at org.gradle.cache.internal.DefaultCacheAccess.longRunningOperation(DefaultCacheAccess.java:276)
    at org.gradle.cache.internal.DefaultPersistentDirectoryStore.longRunningOperation(DefaultPersistentDirectoryStore.java:142)
    at org.gradle.api.internal.changedetection.state.DefaultTaskArtifactStateCacheAccess.longRunningOperation(DefaultTaskArtifactStateCacheAccess.java:78)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:31)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:89)
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
    at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:67)
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:61)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:54)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:166)
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:113)
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:81)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:64)
    at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:33)
    at org.gradle.launcher.cli.ExecuteBuildAction.run(ExecuteBuildAction.java:24)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:35)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
    at org.gradle.launcher.cli.RunBuildAction.run(RunBuildAction.java:50)
    at org.gradle.api.internal.Actions$RunnableActionAdapter.execute(Actions.java:171)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:201)
    at org.gradle.launcher.cli.CommandLineActionFactory$ParseAndBuildAction.execute(CommandLineActionFactory.java:174)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:170)
    at org.gradle.launcher.cli.CommandLineActionFactory$WithLogging.execute(CommandLineActionFactory.java:139)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:33)
    at org.gradle.launcher.cli.ExceptionReportingAction.execute(ExceptionReportingAction.java:22)
    at org.gradle.launcher.Main.doAction(Main.java:48)
    at org.gradle.launcher.bootstrap.EntryPoint.run(EntryPoint.java:45)
    at org.gradle.launcher.Main.main(Main.java:39)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.runNoExit(ProcessBootstrap.java:50)
    at org.gradle.launcher.bootstrap.ProcessBootstrap.run(ProcessBootstrap.java:32)
    at org.gradle.launcher.GradleMain.main(GradleMain.java:26)
    at org.gradle.wrapper.BootstrapMainStarter.start(BootstrapMainStarter.java:33)
    at org.gradle.wrapper.WrapperExecutor.execute(WrapperExecutor.java:130)
    at org.gradle.wrapper.GradleWrapperMain.main(GradleWrapperMain.java:48)
Caused by: java.io.IOException: Can't read [/home/geantvert/workspace/OSkinProject/OSkin/build/classes/release] (No such file or directory)
    at proguard.InputReader.readInput(InputReader.java:230)
    at proguard.InputReader.readInput(InputReader.java:200)
    at proguard.InputReader.readInput(InputReader.java:178)
    at proguard.InputReader.execute(InputReader.java:78)
    at proguard.ProGuard.readInput(ProGuard.java:197)
    at proguard.ProGuard.execute(ProGuard.java:79)
    at proguard.gradle.ProGuardTask.proguard(ProGuardTask.java:958)
    at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:248)
    at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:136)
    at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:147)
    at proguard.gradle.ProGuardTask_Decorated.invokeMethod(Unknown Source)
    at org.gradle.api.internal.BeanDynamicObject$MetaClassAdapter.invokeMethod(BeanDynamicObject.java:248)
    at org.gradle.api.internal.BeanDynamicObject.invokeMethod(BeanDynamicObject.java:136)
    at org.gradle.api.internal.CompositeDynamicObject.invokeMethod(CompositeDynamicObject.java:147)
    at proguard.gradle.ProGuardTask_Decorated.invokeMethod(Unknown Source)
    at org.gradle.util.ReflectionUtil.invoke(ReflectionUtil.groovy:23)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:220)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:213)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:202)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:530)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:513)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
    ... 53 more
Caused by: java.io.IOException: No such file or directory
    at proguard.io.DirectoryPump.pumpDataEntries(DirectoryPump.java:50)
    at proguard.InputReader.readInput(InputReader.java:226)
    ... 75 more


BUILD FAILED

Total time: 42.363 secs

Here is my gradle file:

buildscript {
    repositories {
        mavenCentral()

    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.5.+'
    }
}
apply plugin: 'android'

repositories {
    mavenCentral()
    maven {
        url 'http://www.bugsense.com/gradle/'
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: '*.jar')

    compile 'com.google.guava:guava:14.+'
    compile 'com.google.code.gson:gson:2.+'
    compile 'org.zeroturnaround:zt-zip:1.+'
    compile 'com.github.japgolly.android:svg-android:2.+'
    compile('de.keyboardsurfer.android.widget:crouton:1.8.1') {
        exclude module: 'support-v4'
        compile 'com.android.support:support-v4:18.+'
    }
    compile 'com.squareup:otto:1.3.4'
    compile 'com.squareup.okhttp:okhttp:1.2.+'
    compile 'com.squareup.picasso:picasso:1+'
    compile 'com.bugsense.trace:bugsense:3.5'

    //Google Drive SDK
    compile 'com.google.android.gms:play-services:3.+'
    compile 'com.google.apis:google-api-services-drive:v2+'

    compile('com.google.api-client:google-api-client:1.+') {
        exclude(group: 'xpp3', module: 'xpp3')
        exclude(group: 'org.apache.httpcomponents', module: 'httpclient')
        exclude(group: 'junit', module: 'junit')
        exclude(group: 'com.google.android', module: 'android')
    }
    compile('com.google.api-client:google-api-client-android:1.+') {
        exclude group: 'xpp3'
        exclude group: 'com.google.android.google-play-services'
    }
    compile('com.google.http-client:google-http-client-jackson:1.+') {
        exclude group: 'xpp3'
    }
    compile('com.google.http-client:google-http-client-gson:1.+') {
        exclude group: 'xpp3'
    }

    compile 'com.google.apis:google-api-services-plus:v1+'

    compile 'com.netflix.rxjava:rxjava-android:+'

    compile('com.github.frankiesardo:icepick:2+') {
        exclude module: 'support-v4'
        compile 'com.android.support:support-v4:18.+'
    }

//    compile (group: 'com.google.apis', name: 'google-api-services-youtube', version: 'v3-rev56-1.15.0-rc')
}

android {
    compileSdkVersion 18
    buildToolsVersion "18.0.1"

    defaultConfig {
        minSdkVersion 14
        targetSdkVersion 18
    }
    signingConfigs {
        release {
                    storeFile file('path_to_file')
                    storePassword '***'
                    keyAlias '***'
                    keyPassword '***'
                }
    }

    buildTypes

Answer 1

I've been battling this issue for the past few hours. Basically the proguard task will halt execution if there are any warnings. You can see the Proguard warnings, and the stacktrace, by adding -d to the build (as in: gradle clean assembleRelease -d). Note that the stacktrace mentions to "Please correct the above warnings first."

In order to just get to a point where the build would get through proguard, I had to add -dontwarn entries for packages it was complaining about to my proguard-project.txt file. Something along the lines of:

-dontwarn org.apache.lang.**

...etc

So put simply... do as the stacktrace instructs you to do. Fix the warnings! :)

BTW, I apologize, as I now recognize that the stacktrace in the original post is not quite the same as the one I encountered. However, I do feel my answer is helpful, as obviously I ended up here trying to search for answers to my issue.