FULL PRODUCT VERSION :
java version "9-ea"
Java(TM) SE Runtime Environment (build 9-ea+158)
Java HotSpot(TM) 64-Bit Server VM (build 9-ea+158, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
 System Version: macOS 10.12 (16A320)
  Kernel Version: Darwin 16.0.0

A DESCRIPTION OF THE PROBLEM :
Open JShell and try import a class with tab completion. Jshell crashes with NPE

$ ./jshell
| Welcome to JShell -- Version 9-ea
| For an introduction type: /help intro

jshell> import Ke <Press Tab>


$ ./jshell
| Welcome to JShell -- Version 9-ea
| For an introduction type: /help intro

jshell> import KeyException in thread "main" java.lang.NullPointerException
at jdk.jshell/jdk.jshell.SourceCodeAnalysisImpl.computeSuggestions(SourceCodeAnalysisImpl.java:384)
at jdk.jshell/jdk.jshell.SourceCodeAnalysisImpl.completionSuggestionsImpl(SourceCodeAnalysisImpl.java:282)
at jdk.jshell/jdk.jshell.SourceCodeAnalysisImpl.completionSuggestions(SourceCodeAnalysisImpl.java:247)
at jdk.jshell/jdk.internal.jshell.tool.ConsoleIOContext$3.complete(ConsoleIOContext.java:123)
at jdk.internal.le/jdk.internal.jline.console.ConsoleReader.complete(ConsoleReader.java:3326)
at jdk.internal.le/jdk.internal.jline.console.ConsoleReader.readLine(ConsoleReader.java:2683)
at jdk.internal.le/jdk.internal.jline.console.ConsoleReader.readLine(ConsoleReader.java:2278)
at jdk.jshell/jdk.internal.jshell.tool.ConsoleIOContext.readLine(ConsoleIOContext.java:197)
at jdk.jshell/jdk.internal.jshell.tool.JShellTool.run(JShellTool.java:1107)
at jdk.jshell/jdk.internal.jshell.tool.JShellTool.start(JShellTool.java:908)
at jdk.jshell/jdk.internal.jshell.tool.JShellToolBuilder.run(JShellToolBuilder.java:239)
at jdk.jshell/jdk.internal.jshell.tool.JShellToolProvider.main(JShellToolProvider.java:119)


REPRODUCIBILITY :
This bug can be reproduced always.