我最近将android工作室更新到版本2.3，构建工具到25.0.2，gradle 2.3.0和gradle distribution 3.3现在我在构建项目时得到了这个。从来没有旧版本的这个问题。
* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':app:transformClassesAndResourcesWithProguardForRelease'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:84)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:55)
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:88)
at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:51)
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:54)
at org.gradle.api.internal.tasks.execution.ExecuteAtMostOnceTaskExecuter.execute(ExecuteAtMostOnceTaskExecuter.java:43)
at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:34)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.execute(DefaultTaskGraphExecuter.java:236)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker$1.execute(DefaultTaskGraphExecuter.java:228)
at org.gradle.internal.Transformers$4.transform(Transformers.java:169)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:106)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:61)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:228)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:215)
at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:77)
at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:58)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54)
at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40)
Caused by: java.lang.RuntimeException: Job failed, see logs for details
at com.android.build.gradle.internal.transforms.ProGuardTransform.transform(ProGuardTransform.java:196)
at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:185)
at com.android.build.gradle.internal.pipeline.TransformTask$2.call(TransformTask.java:181)
at com.android.builder.profile.ThreadRecorder.record(ThreadRecorder.java:102)
at com.android.build.gradle.internal.pipeline.TransformTask.transform(TransformTask.java:176)
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73)
at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$IncrementalTaskAction.doExecute(DefaultTaskClassInfoStore.java:163)
at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:134)
at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:123)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:95)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:76)
... 20 more
Caused by: java.io.IOException: java.lang.NullPointerException
at com.android.build.gradle.internal.transforms.ProGuardTransform.doMinification(ProGuardTransform.java:283)
at com.android.build.gradle.internal.transforms.ProGuardTransform.access$000(ProGuardTransform.java:63)
at com.android.build.gradle.internal.transforms.ProGuardTransform$1.run(ProGuardTransform.java:173)
at com.android.builder.tasks.Job.runTask(Job.java:48)
at com.android.build.gradle.tasks.SimpleWorkQueue$EmptyThreadContext.runTask(SimpleWorkQueue.java:41)
at com.android.builder.tasks.WorkQueue.run(WorkQueue.java:225)
Caused by: java.lang.NullPointerException
at proguard.optimize.info.NonEmptyStackReturnMarker.setReturnsWithNonEmptyStack(NonEmptyStackReturnMarker.java:102)
at proguard.optimize.info.NonEmptyStackReturnMarker.markReturnWithNonEmptyStack(NonEmptyStackReturnMarker.java:95)
at proguard.optimize.info.NonEmptyStackReturnMarker.visitSimpleInstruction(NonEmptyStackReturnMarker.java:72)
at proguard.classfile.instruction.visitor.MultiInstructionVisitor.visitSimpleInstruction(MultiInstructionVisitor.java:88)
at proguard.classfile.instruction.SimpleInstruction.accept(SimpleInstruction.java:218)
at proguard.classfile.attribute.CodeAttribute.instructionsAccept(CodeAttribute.java:138)
at proguard.classfile.attribute.CodeAttribute.instructionsAccept(CodeAttribute.java:110)
at proguard.classfile.instruction.visitor.AllInstructionVisitor.visitCodeAttribute(AllInstructionVisitor.java:54)
at proguard.classfile.attribute.visitor.MultiAttributeVisitor.visitCodeAttribute(MultiAttributeVisitor.java:245)
at proguard.classfile.attribute.CodeAttribute.accept(CodeAttribute.java:101)
at proguard.classfile.ProgramMethod.attributesAccept(ProgramMethod.java:81)
at proguard.classfile.attribute.visitor.AllAttributeVisitor.visitProgramMember(AllAttributeVisitor.java:95)
at proguard.classfile.util.SimplifiedVisitor.visitProgramMethod(SimplifiedVisitor.java:92)
at proguard.classfile.visitor.MultiMemberVisitor.visitProgramMethod(MultiMemberVisitor.java:92)
at proguard.classfile.ProgramMethod.accept(ProgramMethod.java:73)
at proguard.classfile.ProgramClass.methodsAccept(ProgramClass.java:516)
at proguard.classfile.visitor.AllMethodVisitor.visitProgramClass(AllMethodVisitor.java:47)
at proguard.classfile.visitor.MultiClassVisitor.visitProgramClass(MultiClassVisitor.java:85)
at proguard.classfile.ProgramClass.accept(ProgramClass.java:358)
at proguard.classfile.ClassPool.classesAccept(ClassPool.java:124)
at proguard.optimize.Optimizer.execute(Optimizer.java:649)
at proguard.ProGuard.optimize(ProGuard.java:328)
at proguard.ProGuard.execute(ProGuard.java:127)
at com.android.build.gradle.internal.transforms.BaseProguardAction.runProguard(BaseProguardAction.java:54)
at com.android.build.gradle.internal.transforms.ProGuardTransform.doMinification(ProGuardTransform.java:254)
... 5 more
BUILD FAILED
类似的问题引用here。它似乎在proguard 5.3.3中得到修复。
尝试使用以下方法将proguard升级到5.3.3：
buildscript {
configurations.all {
resolutionStrategy {
force 'net.sf.proguard:proguard-gradle:5.3.3'
}
}
}
有类似的问题，
-ignorewarnings
在proguard-rules.pro结束时修复它。