jjs> ++ +3

 ++ +3
ECMAScript Exception: SyntaxError: java.lang.NullPointerException
ECMAScript Exception: SyntaxError: java.lang.NullPointerException
at jdk.nashorn.internal.runtime.ECMAErrors.error(ECMAErrors.java:66)
at jdk.nashorn.internal.runtime.ECMAErrors.asEcmaException(ECMAErrors.java:108)
at jdk.nashorn.internal.runtime.ParserException.throwAsEcmaException(ParserException.java:114)
at jdk.nashorn.internal.runtime.Context.eval(Context.java:374)
at jdk.nashorn.tools.Shell.readEvalPrint(Shell.java:439)
at jdk.nashorn.tools.Shell.run(Shell.java:167)
at jdk.nashorn.tools.Shell.main(Shell.java:142)
at jdk.nashorn.tools.Shell.main(Shell.java:121)
Caused by: jdk.nashorn.internal.runtime.ParserException: java.lang.NullPointerException
at jdk.nashorn.internal.runtime.Context$ThrowErrorManager.error(Context.java:223)
at jdk.nashorn.internal.parser.Parser.recover(Parser.java:318)
at jdk.nashorn.internal.parser.Parser.sourceElements(Parser.java:718)
at jdk.nashorn.internal.parser.Parser.program(Parser.java:607)
at jdk.nashorn.internal.parser.Parser.parse(Parser.java:192)
at jdk.nashorn.internal.parser.Parser.parse(Parser.java:167)
at jdk.nashorn.internal.runtime.Context.compile(Context.java:775)
at jdk.nashorn.internal.runtime.Context.eval(Context.java:372)
... 4 more