Realm，初始化一個空字符串數組返回「Unsupported type java.lang.String []」on build

Question

我試圖初始化一個Kotlin類中的空字符串數組，但是它的語法似乎是逃避我，我檢查了科特林文檔，我覺得我做正確的方式，但是我總是最後下列消息時，它建立：

Error:Execution failed for task ':core:compileDebugJavaWithJavac'. 
> java.lang.IllegalStateException: Unsupported type java.lang.String[] 

我試着初始化它的下面的方法， Android Studio不會將這些中的任何一行紅線。

var categories = emptyArray<String>() 
var categories = arrayOf<String>() 
var categories: Array<String> = emptyArray() 
var categories: Array<String> = arrayOf() 

它似乎是一個錯誤，非常有趣的是它的影響在AS 2.3.2以前我穩定科特林設置，並再次奇怪的是，我得到相同的生成錯誤試圖創建的字符串列表時。

所以這似乎是專門在我的筆記本電腦中的錯誤，我在我的桌面上使用AS相同版本的運行完全相同的代碼，在同一個項目，一切都相同，但它編譯。

好吧錯誤正在影響我的桌面我使用普通的Java，甚至沒有科特林地方，這裏的gradle這個堆棧跟蹤：

Exception is: 
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':core:compileDebugJavaWithJavac'. 
    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.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:32) 
    at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:113) 
    at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37) 
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) 
    at org.gradle.execution.DefaultBuildExecuter.access$000(DefaultBuildExecuter.java:23) 
    at org.gradle.execution.DefaultBuildExecuter$1.proceed(DefaultBuildExecuter.java:43) 
    at org.gradle.execution.DryRunBuildExecutionAction.execute(DryRunBuildExecutionAction.java:32) 
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:37) 
    at org.gradle.execution.DefaultBuildExecuter.execute(DefaultBuildExecuter.java:30) 
    at org.gradle.initialization.DefaultGradleLauncher$3.execute(DefaultGradleLauncher.java:196) 
    at org.gradle.initialization.DefaultGradleLauncher$3.execute(DefaultGradleLauncher.java:193) 
    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:56) 
    at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:193) 
    at org.gradle.initialization.DefaultGradleLauncher.doBuild(DefaultGradleLauncher.java:119) 
    at org.gradle.initialization.DefaultGradleLauncher.run(DefaultGradleLauncher.java:102) 
    at org.gradle.launcher.exec.GradleBuildController.run(GradleBuildController.java:71) 
    at org.gradle.tooling.internal.provider.runner.BuildModelActionRunner.run(BuildModelActionRunner.java:50) 
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) 
    at org.gradle.tooling.internal.provider.runner.RunAsBuildOperationBuildActionRunner$1.execute(RunAsBuildOperationBuildActionRunner.java:43) 
    at org.gradle.tooling.internal.provider.runner.RunAsBuildOperationBuildActionRunner$1.execute(RunAsBuildOperationBuildActionRunner.java:40) 
    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:56) 
    at org.gradle.tooling.internal.provider.runner.RunAsBuildOperationBuildActionRunner.run(RunAsBuildOperationBuildActionRunner.java:40) 
    at org.gradle.tooling.internal.provider.runner.SubscribableBuildActionRunner.run(SubscribableBuildActionRunner.java:75) 
    at org.gradle.launcher.exec.ChainingBuildActionRunner.run(ChainingBuildActionRunner.java:35) 
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:41) 
    at org.gradle.launcher.exec.InProcessBuildActionExecuter.execute(InProcessBuildActionExecuter.java:26) 
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:75) 
    at org.gradle.tooling.internal.provider.ContinuousBuildActionExecuter.execute(ContinuousBuildActionExecuter.java:49) 
    at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:44) 
    at org.gradle.tooling.internal.provider.ServicesSetupBuildActionExecuter.execute(ServicesSetupBuildActionExecuter.java:29) 
    at org.gradle.launcher.daemon.server.exec.ExecuteBuild.doBuild(ExecuteBuild.java:67) 
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.WatchForDisconnection.execute(WatchForDisconnection.java:47) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.ResetDeprecationLogger.execute(ResetDeprecationLogger.java:26) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.RequestStopIfSingleUsedDaemon.execute(RequestStopIfSingleUsedDaemon.java:34) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:74) 
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput$2.call(ForwardClientInput.java:72) 
    at org.gradle.util.Swapper.swap(Swapper.java:38) 
    at org.gradle.launcher.daemon.server.exec.ForwardClientInput.execute(ForwardClientInput.java:72) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.LogAndCheckHealth.execute(LogAndCheckHealth.java:55) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.LogToClient.doBuild(LogToClient.java:60) 
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.EstablishBuildEnvironment.doBuild(EstablishBuildEnvironment.java:72) 
    at org.gradle.launcher.daemon.server.exec.BuildCommandOnly.execute(BuildCommandOnly.java:36) 
    at org.gradle.launcher.daemon.server.api.DaemonCommandExecution.proceed(DaemonCommandExecution.java:120) 
    at org.gradle.launcher.daemon.server.exec.StartBuildOrRespondWithBusy$1.run(StartBuildOrRespondWithBusy.java:50) 
    at org.gradle.launcher.daemon.server.DaemonStateCoordinator$1.run(DaemonStateCoordinator.java:297) 
    at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:54) 
    at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:40) 
Caused by: java.lang.RuntimeException: java.lang.IllegalStateException: Unsupported type java.lang.String[] 
    at com.sun.tools.javac.main.Main.compile(Main.java:553) 
    at com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129) 
    at com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138) 
    at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:46) 
    at org.gradle.api.internal.tasks.compile.JdkJavaCompiler.execute(JdkJavaCompiler.java:33) 
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.delegateAndHandleErrors(NormalizingJavaCompiler.java:104) 
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:53) 
    at org.gradle.api.internal.tasks.compile.NormalizingJavaCompiler.execute(NormalizingJavaCompiler.java:38) 
    at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:35) 
    at org.gradle.api.internal.tasks.compile.CleaningJavaCompilerSupport.execute(CleaningJavaCompilerSupport.java:25) 
    at org.gradle.api.tasks.compile.JavaCompile.performCompilation(JavaCompile.java:206) 
    at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:187) 
    at org.gradle.api.tasks.compile.JavaCompile.compile(JavaCompile.java:130) 
    at com.android.build.gradle.tasks.factory.AndroidJavaCompile.compile(AndroidJavaCompile.java:49) 
    at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:73) 
    at org.gradle.api.internal.project.taskfactory.DefaultTaskClassInfoStore$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) 
    ... 78 more 
Caused by: java.lang.IllegalStateException: Unsupported type java.lang.String[] 
    at io.realm.processor.RealmProxyClassGenerator.getRealmTypeChecked(RealmProxyClassGenerator.java:2088) 
    at io.realm.processor.RealmProxyClassGenerator.emitColumnInfoClass(RealmProxyClassGenerator.java:166) 
    at io.realm.processor.RealmProxyClassGenerator.generate(RealmProxyClassGenerator.java:113) 
    at io.realm.processor.RealmProcessor.processAnnotations(RealmProcessor.java:204) 
    at io.realm.processor.RealmProcessor.process(RealmProcessor.java:157) 
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:794) 
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:705) 
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.access$1800(JavacProcessingEnvironment.java:91) 
    at com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1035) 
    at com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1176) 
    at com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1170) 
    at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:856) 
    at com.sun.tools.javac.main.Main.compile(Main.java:523) 
    ... 97 more 

不似乎是一個插件或庫的問題，我在單獨之前將所有內容都丟棄到版本中，並且問題仍然存在。

Answer 1

所以，如果任何人遇到同樣的問題，這是因爲Realm，如果你擴展RealmObject，你不能有一個字符串數組或字符串列表，所以你必須使用像下面這樣的小包裝：

public class RealmString extends RealmObject { 
    public String string; 
} 

然後以下工作：

public RealmList<RealmString> strings; 

希望這可以幫助別人，將來別人。 （在：

class User extends RealmObject { 
    private Order order; 
} 

class Order { 
    private String id; 
} 

可以解決這個問題之一：：

class User extends RealmObject { 
    @Ignore 
    private Order order; 
} 

class Order { 
    private String id; 
} 

或者

Answer 2

，如果您有擴展RealmObject和不@Ignore標註incapsulating其他，如某些對象也可能會出現這個問題這種情況下，「訂單」將被保存在境界）

class User extends RealmObject { 
    private Order order; 
} 

class Order extends RealmObject { 
    private String id; 
}