#57 NullPointer when attempting to generate javado...

# dokka

[user]

#57 NullPointer when attempting to generate javadoc output
[Kotlin/dokka] Issue created by n9Mtq4
When generating javadocs from my kotlin project I get a NullPointerException.
I am using dokka from gradle like so:

dokka {
    outputFormat = "javadoc"
    outputDirectory = "${project.buildDir.getPath()}/javadoc"
}

When running "bash ./gradlew dokka", I get the following stack trace:
<details>
<summary>Click to see stacktrace</summary>
```java.lang.NullPointerException
at com.sun.tools.doclets.internal.toolkit.util.VisibleMemberMap$ClassMembers.memberIsVisible(VisibleMemberMap.java:407)
at com.sun.tools.doclets.internal.toolkit.util.VisibleMemberMap$ClassMembers.addMembers(VisibleMemberMap.java:377)
at com.sun.tools.doclets.internal.toolkit.util.VisibleMemberMap$ClassMembers.build(VisibleMemberMap.java:339)
at com.sun.tools.doclets.internal.toolkit.util.VisibleMemberMap$ClassMembers.access$100(VisibleMemberMap.java:291)
at com.sun.tools.doclets.internal.toolkit.util.VisibleMemberMap.<init>(VisibleMemberMap.java:127)
at com.sun.tools.doclets.internal.toolkit.builders.MemberSummaryBuilder.<init>(MemberSummaryBuilder.java:82)
at com.sun.tools.doclets.internal.toolkit.builders.MemberSummaryBuilder.getInstance(MemberSummaryBuilder.java:101)
at com.sun.tools.doclets.internal.toolkit.builders.BuilderFactory.getMemberSummaryBuilder(BuilderFactory.java:278)
at com.sun.tools.doclets.formats.html.ClassWriterImpl.getNavSummaryLinks(ClassWriterImpl.java:641)
at com.sun.tools.doclets.formats.html.ClassWriterImpl.addSummaryDetailLinks(ClassWriterImpl.java:622)
at com.sun.tools.doclets.formats.html.HtmlDocletWriter.addNavLinks(HtmlDocletWriter.java:560)
at com.sun.tools.doclets.formats.html.ClassWriterImpl.getHeader(ClassWriterImpl.java:165)
at com.sun.tools.doclets.internal.toolkit.builders.ClassBuilder.buildClassDoc(ClassBuilder.java:145)
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:497)
at com.sun.tools.doclets.internal.toolkit.builders.AbstractBuilder.invokeMethod(AbstractBuilder.java:180)
at com.sun.tools.doclets.internal.toolkit.builders.AbstractBuilder.build(AbstractBuilder.java:135)
at com.sun.tools.doclets.internal.toolkit.builders.ClassBuilder.build(ClassBuilder.java:120)
at com.sun.tools.doclets.formats.html.HtmlDoclet.generateClassFiles(HtmlDoclet.java:189)
at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.generateClassFiles(AbstractDoclet.java:192)
at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.startGeneration(AbstractDoclet.java:137)
at com.sun.tools.doclets.internal.toolkit.AbstractDoclet.start(AbstractDoclet.java:82)
at com.sun.tools.doclets.formats.html.HtmlDoclet.start(HtmlDoclet.java:80)
at org.jetbrains.dokka.javadoc.JavadocGenerator.buildPages(dokka-adapters.kt:13)
at org.jetbrains.dokka.GeneratorKt.buildAll(Generator.kt:10)
at org.jetbrains.dokka.GeneratorKt.buildAll(Generator.kt:19)
at org.jetbrains.dokka.DokkaGenerator.generate(main.kt:171)
at org.jetbrains.dokka.gradle.DokkaTask.generate(main.kt:89)
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:497)
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:75)
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.doExecute(AnnotationProcessingTaskFactory.java:226)
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:219)
at org.gradle.api.internal.project.taskfactory.AnnotationProcessingTaskFactory$StandardTaskAction.execute(AnnotationProcessingTaskFactory.java:208)
at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:585)
at org.gradle.api.internal.AbstractTask$TaskActionWrapper.execute(AbstractTask.java:568)
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:52)
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.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:208)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter$EventFiringTaskWorker.execute(DefaultTaskGraphExecuter.java:186)
at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.processTask(AbstractTaskPlanExecutor.java:62)
at org.gradle.execution.taskgraph.AbstractTaskPlanExecutor$TaskExecutorWorker.run(AbstractTaskPlanExecutor.java:50)
at org.gradle.execution.taskgraph.DefaultTaskPlanExecutor.process(DefaultTaskPlanExecutor.java:25)
at org.gradle.execution.taskgraph.DefaultTaskGraphExecuter.execute(DefaultTaskGraphExecuter.java:111)
at org.gradle.execution.SelectedTaskExecutionAction.execute(SelectedTaskExecutionAction.java:37)
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$6.run(DefaultGradleLauncher.java:174)
at org.gradle.internal.Factories$1.create(Factories.java:22)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:47)
at org.gradle.initialization.DefaultGradleLauncher.runBuildOperation(DefaultGradleLauncher.java:189)
at org.gradle.initialization.DefaultGradleLauncher.doBuildStages(DefaultGradleLauncher.java:171)
at org.gradle.initialization.DefaultGradleLauncher.access$200(DefaultGradleLauncher.java:35)
at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:104)
at org.gradle.initialization.DefaultGradleLauncher$1.create(DefaultGradleLauncher.java:97)
at org.gradle.internal.progress.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:62)
at org.gradle.initialization.DefaultGradleLauncher.runRootBuildOperation(DefaultGradleLauncher.java:184)
at org.gradle.initialization.DefaultGradleLauncher.doBu…