Retrolambda: Lint crashes when using lambda expressions with retrolambda

Question

I'm trying to use retrolambda along with gradle-retrolambda plugin. In general it works fine, but when I compile for release, the lint stage fails with exception:

:playground.dagger:lintVitalReleaseFailed converting ECJ parse tree to Lombok for file D:\....\playground\dagger\MainActivity.java
java.lang.UnsupportedOperationException: Unknown ASTNode child: LambdaExpression
    at lombok.ast.ecj.EcjTreeVisitor.visitOther(EcjTreeVisitor.java:368)
    at lombok.ast.ecj.EcjTreeVisitor.visitEcjNode(EcjTreeVisitor.java:364)
    at lombok.ast.ecj.EcjTreeConverter.visit(EcjTreeConverter.java:295)
    at lombok.ast.ecj.EcjTreeConverter.toTree(EcjTreeConverter.java:236)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:282)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:252)
    at lombok.ast.ecj.EcjTreeConverter.access$100(EcjTreeConverter.java:141)
    at lombok.ast.ecj.EcjTreeConverter$2.visitMessageSend(EcjTreeConverter.java:1042)
    at lombok.ast.ecj.EcjTreeVisitor.visitEcjNode(EcjTreeVisitor.java:156)
    at lombok.ast.ecj.EcjTreeConverter.visit(EcjTreeConverter.java:295)
    at lombok.ast.ecj.EcjTreeConverter.toTree(EcjTreeConverter.java:236)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:282)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:252)
    at lombok.ast.ecj.EcjTreeConverter.toBlock(EcjTreeConverter.java:397)
    at lombok.ast.ecj.EcjTreeConverter.access$1500(EcjTreeConverter.java:141)
    at lombok.ast.ecj.EcjTreeConverter$2.visitMethodDeclaration(EcjTreeConverter.java:1241)
    at lombok.ast.ecj.EcjTreeVisitor.visitEcjNode(EcjTreeVisitor.java:152)
    at lombok.ast.ecj.EcjTreeConverter.visit(EcjTreeConverter.java:295)
    at lombok.ast.ecj.EcjTreeConverter.toTree(EcjTreeConverter.java:236)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:282)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:252)
    at lombok.ast.ecj.EcjTreeConverter.access$100(EcjTreeConverter.java:141)
    at lombok.ast.ecj.EcjTreeConverter$2.createNormalTypeBody(EcjTreeConverter.java:563)
    at lombok.ast.ecj.EcjTreeConverter$2.visitTypeDeclaration(EcjTreeConverter.java:486)
    at lombok.ast.ecj.EcjTreeVisitor.visitEcjNode(EcjTreeVisitor.java:48)
    at lombok.ast.ecj.EcjTreeConverter.visit(EcjTreeConverter.java:295)
    at lombok.ast.ecj.EcjTreeConverter.toTree(EcjTreeConverter.java:236)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:282)
    at lombok.ast.ecj.EcjTreeConverter.fillList(EcjTreeConverter.java:252)
    at lombok.ast.ecj.EcjTreeConverter.access$100(EcjTreeConverter.java:141)
    at lombok.ast.ecj.EcjTreeConverter$2.visitCompilationUnitDeclaration(EcjTreeConverter.java:441)
    at lombok.ast.ecj.EcjTreeVisitor.visitEcjNode(EcjTreeVisitor.java:264)
    at lombok.ast.ecj.EcjTreeConverter.visit(EcjTreeConverter.java:295)
    at com.android.tools.lint.EcjParser.parseJava(EcjParser.java:407)
    at com.android.tools.lint.client.api.JavaVisitor.visitFile(JavaVisitor.java:236)
    at com.android.tools.lint.client.api.LintDriver.checkJava(LintDriver.java:1491)
    at com.android.tools.lint.client.api.LintDriver.runFileDetectors(LintDriver.java:1026)
    at com.android.tools.lint.client.api.LintDriver.checkProject(LintDriver.java:882)
    at com.android.tools.lint.client.api.LintDriver.analyze(LintDriver.java:433)
    at com.android.tools.lint.client.api.LintDriver.analyze(LintDriver.java:374)
    at com.android.tools.lint.LintCliClient.run(LintCliClient.java:130)
    at com.android.build.gradle.internal.LintGradleClient.run(LintGradleClient.java:112)
    at com.android.build.gradle.internal.LintGradleClient$run.call(Unknown Source)
    at com.android.build.gradle.tasks.Lint.runLint(Lint.groovy:198)
    at com.android.build.gradle.tasks.Lint.this$4$runLint(Lint.groovy)
    at com.android.build.gradle.tasks.Lint$this$4$runLint$1.callCurrent(Unknown Source)
    at com.android.build.gradle.tasks.Lint.lintSingleVariant(Lint.groovy:173)
    at com.android.build.gradle.tasks.Lint$lintSingleVariant$0.callCurrent(Unknown Source)
    at com.android.build.gradle.tasks.Lint.lint(Lint.groovy:75)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:63)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:218)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:211)
    at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:200)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:579)
    at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:562)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:80)
    at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:61)
    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:64)
    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:305)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.executeTask(AbstractTaskPlanExecutor.java:79)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:63)
    at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:51)
    at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:23)
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:88)
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:29)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
    at org.gradle.execution.DefaultBuildExecuter.access$200(DefaultBuildExecuter.java:23)
    at org.gradle.execution.DefaultBuildExecuter$2.proceed(DefaultBuildExecuter.java:68)
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:62)
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:55)
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:149)
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:106)
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:86)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter$DefaultBuildController.run(InProcessBuildActionExecuter.java:80)
    at org.gradle.tooling.internal.provider.BuildModelAction.run(BuildModelAction.java:43)
    at org.gradle.tooling.internal.provider.BuildModelAction.run(BuildModelAction.java:30)
    at org.gradle.tooling.internal.provider.ConfiguringBuildAction.run(ConfiguringBuildAction.java:119)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:36)
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26)
    at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:47)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:34)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:35)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:24)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.StartStopIfBuildAndStop.execute(StartStopIfBuildAndStop.java:33)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:71)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:69)
    at org.gradle.util.Swapper.swap(Swapper.java:38)
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:69)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:60)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:34)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:70)
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:34)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.DaemonHygieneAction.execute(DaemonHygieneAction.java:39)
    at org.gradle.launcher.daemon.server.exec.DaemonCommandExecution.proceed(DaemonCommandExecution.java:119)
    at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:46)
    at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:246)
    at org.gradle.internal.concurrent.DefaultExecutorFactory$StoppableExecutorImpl$1.run(DefaultExecutorFactory.java:64)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:745)

Is there anything to do about it? Of course, a trivial work/around would be to disable lint check for release. But I'm looking for solution, allowing to keep lint.

Following is app's module build.gradle:

apply plugin: 'com.android.application'
apply plugin: 'me.tatarka.retrolambda'
apply plugin: 'com.neenbedankt.android-apt'

configurations {
    apt
}

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    compileSdkVersion 22
    buildToolsVersion "21.1.2"

    defaultConfig {
        minSdkVersion 10
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }

    buildTypes {
        release {
            minifyEnabled true
            shrinkResources true
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
}

repositories {
    maven{
        url 'https://oss.sonatype.org/content/repositories/snapshots/'
    }
}


dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:22.0.0'
    compile 'com.jakewharton:butterknife:6.1.0'
    compile 'com.google.dagger:dagger:2.0-SNAPSHOT'
    compile 'de.greenrobot:eventbus:2.4.0'
    retrolambdaConfig 'net.orfjackal.retrolambda:retrolambda:1.8.1'
    apt 'com.google.dagger:dagger-compiler:2.0-SNAPSHOT'
    provided 'org.glassfish:javax.annotation:10.0-b28'
}

Root build.gradle:

buildscript {
    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:1.1.0'
        classpath 'com.neenbedankt.gradle.plugins:android-apt:1.4'
        classpath 'me.tatarka:gradle-retrolambda:2.5.0'
    }
}

allprojects {
    repositories {
        jcenter()
    }
}

Enfold

I have the same problem since some time and unfortunately could not find a solution yet.. It might be caused because lint uses a lombok-ast fork that is not able to deal with lambdas. See: android.googlesource.com/platform/prebuilts/tools/+/master/… – Wamble

You said 'since some time': do you mean that you were able to use lambdas in the past, without having lint complaining about it? – Enfold

Not sure, I only remember that I was already using lambdas for maybe a month or two before I first noticed the problem. But I was mostly using Android Studio to build. The problem then became visible after a gradle build from command line. – Wamble

I'm having the same issue. I found out I can compile a signed apk under debug, but not under release. – Plastered

@EduardoBonet, sure because by default lint check is enabled for release configuration. You will be able to build for release if you disable the lint check. Just add the following line: lintOptions { checkReleaseBuilds false } within the android section – Enfold

Answer 1

You can use a special lombok version with lint which does not whine about Java 8 features.

buildscript {
    repositories {
        jcenter()
        ...
    }

    dependencies {
        classpath 'com.android.tools.build:gradle:<version>'
        classpath 'me.tatarka:gradle-retrolambda:<version>'
        classpath 'me.tatarka.retrolambda.projectlombok:lombok.ast:0.2.3.a2'
    }

    // Exclude the version that the android plugin depends on.
    configurations.classpath.exclude group: 'com.android.tools.external.lombok'
}

This way you can keep running lint on the whole project, even with the latest versions of the Android Gradle plugin.

Note: If you receive same errors, try to put the configuration above into the top most build.gradle file. It should work then.

Curtal

Answer 2

There is a GitHub issue that discusses this problem: https://github.com/evant/gradle-retrolambda/issues/96

One of the comments in the issue mentions that lint never actually worked with retrolambda but rather, with the newest lint version, is now "failing loudly" instead of simply skipping the rest of the file when a lambda was encountered.

With this in mind, it seems like there are two options. One, you could simply disable lint like you mentioned in your question. Of course the problem with this is that you would lose the benefit of lint scanning the rest of your code. The second option is to roll back your lint version such that it is no longer "failing loudly" but rather simply skips checking the lambda-related source; this way, lint can still scan the rest of your application source code.

According to the GitHub issue, rolling back your lint version from 24.0.1 (you might have a different version) to 24.0.0 seems to fix the problem. You can find this information in the issue (link posted at beginning of answer).

Backflow