Kotlin未解决的参考：来自gradle上的println
在kotlin函数之前放置println语句将返回崩溃。 堆栈跟踪：
thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ gradle clean build --stacktrace w: Classpath entry points to a non-existent location: e: /home/thufir/NetBeansProjects/kotlin/src/main/kotlin/example.kt: (14, 5): Unresolved reference: println > Task :compileKotlin Using Kotlin incremental compilation FAILURE: Build failed with an exception. * What went wrong: Execution failed for task ':compileKotlin'. > Compilation error. See log for more details * Try: Run with --info or --debug option to get more log output. * Exception is: org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':compileKotlin'. at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:100) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:70) at org.gradle.api.internal.tasks.execution.SkipUpToDateTaskExecuter.execute(SkipUpToDateTaskExecuter.java:62) at org.gradle.api.internal.tasks.execution.ResolveTaskOutputCachingStateExecuter.execute(ResolveTaskOutputCachingStateExecuter.java:54) at org.gradle.api.internal.tasks.execution.ResolveBuildCacheKeyExecuter.execute(ResolveBuildCacheKeyExecuter.java:61) at org.gradle.api.internal.tasks.execution.ValidatingTaskExecuter.execute(ValidatingTaskExecuter.java:58) at org.gradle.api.internal.tasks.execution.SkipEmptySourceFilesTaskExecuter.execute(SkipEmptySourceFilesTaskExecuter.java:97) at org.gradle.api.internal.tasks.execution.CleanupStaleOutputsExecuter.execute(CleanupStaleOutputsExecuter.java:87) at org.gradle.api.internal.tasks.execution.ResolveTaskArtifactStateTaskExecuter.execute(ResolveTaskArtifactStateTaskExecuter.java:52) at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:52) 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$1.run(DefaultTaskGraphExecuter.java:248) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:241) at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:230) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.processTask(DefaultTaskPlanExecutor.java:123) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.access$200(DefaultTaskPlanExecutor.java:79) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:104) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker$1.execute(DefaultTaskPlanExecutor.java:98) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.execute(DefaultTaskExecutionPlan.java:625) at org.gradle.execution.taskgraph.DefaultTaskExecutionPlan.executeWithTask(DefaultTaskExecutionPlan.java:580) at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor$TaskExecutorWorker.run(DefaultTaskPlanExecutor.java:98) at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63) at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:46) at org.gradle.internal.concurrent.ThreadFactoryImpl$ManagedThreadRunnable.run(ThreadFactoryImpl.java:55) Caused by: org.gradle.api.GradleException: Compilation error. See log for more details at org.jetbrains.kotlin.gradle.tasks.TasksUtilsKt.throwGradleExceptionIfError(tasksUtils.kt:8) at org.jetbrains.kotlin.gradle.tasks.KotlinCompile.processCompilerExitCode(Tasks.kt:359) at org.jetbrains.kotlin.gradle.tasks.KotlinCompile.callCompiler$kotlin_gradle_plugin(Tasks.kt:333) at org.jetbrains.kotlin.gradle.tasks.KotlinCompile.callCompiler$kotlin_gradle_plugin(Tasks.kt:231) at org.jetbrains.kotlin.gradle.tasks.AbstractKotlinCompile.execute(Tasks.kt:203) at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73) at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$IncrementalTaskAction.doExecute(DefaultTaskClassInfoStore.java:179) at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:135) at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$StandardTaskAction.execute(DefaultTaskClassInfoStore.java:122) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter$1.run(ExecuteActionsTaskExecuter.java:121) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:336) at org.gradle.internal.progress.DefaultBuildOperationExecutor$RunnableBuildOperationWorker.execute(DefaultBuildOperationExecutor.java:328) at org.gradle.internal.progress.DefaultBuildOperationExecutor.execute(DefaultBuildOperationExecutor.java:199) at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:110) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeAction(ExecuteActionsTaskExecuter.java:110) at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeActions(ExecuteActionsTaskExecuter.java:92) ... 29 more * Get more help at https://help.gradle.org BUILD FAILED in 0s 2 actionable tasks: 2 executed thufir@dur:~/NetBeansProjects/kotlin$
拿出违规路线，成功输出：
thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ gradle clean runShadow w: Classpath entry points to a non-existent location: > Task :compileKotlin Using Kotlin incremental compilation > Task :shadowJar The SimpleWorkResult type has been deprecated and is scheduled to be removed in Gradle 5.0. Please use WorkResults.didWork() instead. > Task :runShadow Nov 04, 2017 8:42:47 PM net.bounceme.dur.kotlin.App run INFO: running Nov 04, 2017 8:42:47 PM net.bounceme.dur.kotlin.App run INFO: integer is 2 Nov 04, 2017 8:42:47 PM net.bounceme.dur.kotlin.App run INFO: integer is 4 BUILD SUCCESSFUL in 1s 7 actionable tasks: 7 executed thufir@dur:~/NetBeansProjects/kotlin$
Java的：
package net.bounceme.dur.kotlin; import java.util.logging.Logger; public class App { private static final Logger LOG = Logger.getLogger(App.class.getName()); private void run() { LOG.info("running"); int integer = 2; LOG.info("integer is\t\t" + integer); new demo.Foo(); demo.ExampleKt.bar(); integer = demo.ExampleKt.doubleUp(integer); LOG.info("integer is\t\t" + integer); } public static void main(String[] args) { new App().run(); } }
科特林：
package demo; class Foo val PI = 3.14 var x = 0 fun bar() { x += 1 } fun doubleUp(value: Int): Int { return value * 2 }
构建文件：
plugins { id 'com.gradle.build-scan' version '1.8' // id 'java' id 'application' id "org.jetbrains.kotlin.jvm" version "1.1.51" id 'com.github.johnrengelman.shadow' version '2.0.1' } buildScan { licenseAgreementUrl = 'https://gradle.com/terms-of-service' licenseAgree = 'yes' //publishAlways() } configurations { provided } shadowJar { baseName = 'kotlinAdder' classifier = null version = null } sourceCompatibility = 1.8 targetCompatibility = 1.8 mainClassName = 'net.bounceme.dur.kotlin.App' repositories { jcenter() } configurations { provided } dependencies { }
环境：
thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ kotlin -version Kotlin version 1.1.51 (JRE 1.8.0_151-b12) thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ kotlinc -version info: kotlinc-jvm 1.1.51 (JRE 1.8.0_151-b12) thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ java -version java version "1.8.0_151" Java(TM) SE Runtime Environment (build 1.8.0_151-b12) Java HotSpot(TM) 64-Bit Server VM (build 25.151-b12, mixed mode) thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ javac -version javac 1.8.0_151 thufir@dur:~/NetBeansProjects/kotlin$
项目：
. ├── build.gradle ├── gradle │ └── wrapper │ ├── gradle-wrapper.jar │ └── gradle-wrapper.properties ├── gradlew ├── gradlew.bat ├── settings.gradle └── src ├── main │ ├── java │ │ └── net │ │ └── bounceme │ │ └── dur │ │ └── kotlin │ │ └── App.java │ └── kotlin │ └── example.kt └── test └── java 12 directories, 8 files
这是尽可能简单，Java调用Kotlin。 不知道我怎么能简化它。 这是一个版本问题？
当我使用netbeans gradle时，纯粹是从CLI运行的。 我甚至可以删除NB文件，如果证明有用..
也许我只是不正确地打印到控制台。
卫生署。 需要 kotlin。
thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ gradle clean shadowJar > Task :compileKotlin Using Kotlin incremental compilation > Task :shadowJar The SimpleWorkResult type has been deprecated and is scheduled to be removed in Gradle 5.0. Please use WorkResults.didWork() instead. BUILD SUCCESSFUL in 1s 4 actionable tasks: 4 executed thufir@dur:~/NetBeansProjects/kotlin$ thufir@dur:~/NetBeansProjects/kotlin$ gradle runShadow > Task :runShadow Nov 04, 2017 10:43:44 PM net.bounceme.dur.kotlin.App run INFO: running Nov 04, 2017 10:43:44 PM net.bounceme.dur.kotlin.App run INFO: integer is 2 hellooo from kotlin Nov 04, 2017 10:43:44 PM net.bounceme.dur.kotlin.App run INFO: integer is 4 BUILD SUCCESSFUL in 1s 6 actionable tasks: 3 executed, 3 up-to-date thufir@dur:~/NetBeansProjects/kotlin$ plugins { id 'com.gradle.build-scan' version '1.8' // id 'java' id 'application' id "org.jetbrains.kotlin.jvm" version "1.1.51" id 'com.github.johnrengelman.shadow' version '2.0.1' } buildScan { licenseAgreementUrl = 'https://gradle.com/terms-of-service' licenseAgree = 'yes' //publishAlways() } configurations { provided } shadowJar { baseName = 'kotlinAdder' classifier = null version = null } sourceCompatibility = 1.8 targetCompatibility = 1.8 mainClassName = 'net.bounceme.dur.kotlin.App' repositories { jcenter() } configurations { provided } dependencies { compile "org.jetbrains.kotlin:kotlin-stdlib:1.1.51" }
必须添加依赖项。