ADDITIONAL SYSTEM INFORMATION :
openjdk full version "11+28"

A DESCRIPTION OF THE PROBLEM :
When the package of a class file doesn't match with its location on the classpath, a NullPointerException may be thrown.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile a class which is in the default package, but placed inside a subdirectory, e.g. in PowerShell:

mkdir xyz | Out-Null
echo "public class Test { public static int V = 0; }" | Out-File xyz/Test.java -Encoding ascii
javac .\xyz\Test.java

Then run jshell and execute the following 2 commands:

import static xyz.Test.V
var v = xyz.Test.V

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Both commands give an error, but don't let JShell crash
ACTUAL -
The first command gives an error:

| Error:
| cannot access xyz.Test
| bad class file: .\xyz\Test.class
| class file contains wrong class: abc.Test
| Please remove or make sure it appears in the correct subdirectory of the classpath.
| import static xyz.Test.V;
| ^------^
| Error:
| static import only from classes and interfaces
| import static xyz.Test.V;
| ^-----------------------^

But the second command crashes JShell with the following exception:

Exception in thread "main" java.lang.NullPointerException
        at jdk.jshell/jdk.jshell.Eval.processVariables(Eval.java:335)
        at jdk.jshell/jdk.jshell.Eval.lambda$sourceToSnippets$1(Eval.java:215)
        at jdk.jshell/jdk.jshell.TaskFactory.lambda$parse$6(TaskFactory.java:253)
        at jdk.jshell/jdk.jshell.TaskFactory.lambda$runTask$4(TaskFactory.java:213)
        at jdk.compiler/com.sun.tools.javac.api.JavacTaskPool.getTask(JavacTaskPool.java:182)
        at jdk.jshell/jdk.jshell.TaskFactory.runTask(TaskFactory.java:206)
        at jdk.jshell/jdk.jshell.TaskFactory.parse(TaskFactory.java:140)
        at jdk.jshell/jdk.jshell.TaskFactory.parse(TaskFactory.java:238)
        at jdk.jshell/jdk.jshell.Eval.sourceToSnippets(Eval.java:197)
        at jdk.jshell/jdk.jshell.Eval.eval(Eval.java:133)
        at jdk.jshell/jdk.jshell.JShell.eval(JShell.java:493)
        at jdk.jshell/jdk.internal.jshell.tool.JShellTool.processSource(JShellTool.java:3547)
        at jdk.jshell/jdk.internal.jshell.tool.JShellTool.processSourceCatchingReset(JShellTool.java:1301)
        at jdk.jshell/jdk.internal.jshell.tool.JShellTool.processInput(JShellTool.java:1203)
        at jdk.jshell/jdk.internal.jshell.tool.JShellTool.run(JShellTool.java:1176)
        at jdk.jshell/jdk.internal.jshell.tool.JShellTool.start(JShellTool.java:975)
        at jdk.jshell/jdk.internal.jshell.tool.JShellToolBuilder.start(JShellToolBuilder.java:254)
        at jdk.jshell/jdk.internal.jshell.tool.JShellToolProvider.main(JShellToolProvider.java:120)

CUSTOMER SUBMITTED WORKAROUND :
Make sure classes on the classpath are in their correct locations