Name: tb29552 Date: 02/27/2000


java version "1.2.2"
Classic VM (build JDK-1.2.2-001, native threads, symcjit)

Create a file containing only 2 bytes: "//" and compile that file with javac.
Notice that no diagostic is reported. This is contrary to the specification of
java's lexical structure, which says that "//" a newline is required to be
paired with a newline:

There is the description...
// text A single-line comment: all the text from the ASCII characters // to the
end of the line is ignored (as in C++).

And the grammar...
EndOfLineComment:
/ / CharactersInLineopt LineTerminator

It would appear that the End Of File is also acting as a line terminator,
as defined in JLS section 3.4 "Line Terminators":
  http://java.sun.com/docs/books/jls/html/3.doc.html#231571

(Incidently, the compiler does properly report a diagnostic if the file
contains only "/*".)

Compare this:
% ls -l Comment1.java
-rw-r--r-- 1 user group 2 Feb 27 11:00 Comment1.java
(the file is two bytes long...)

 cat Comment1.java
//% javac -J-showversion Comment1.java
java version "1.3.0rc1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0rc1-U)
Java HotSpot(TM) Client VM (build 1.3.0rc1-S, interpreted mode)

%

To this:

% ls -l Comment2.java
-rw-r--r-- 1 user group 2 Feb 27 11:02 Comment2.java
(again, the file is two bytes long...)

% cat Comment2.java
/*%javac -J-showversion Comment2.java
java version "1.3.0rc1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0rc1-U)
Java HotSpot(TM) Client VM (build 1.3.0rc1-S, interpreted mode)

Comment2.java:1: unclosed comment
/*
^
Comment2.java:1: 'class' or 'interface' expected
/*
  ^
2 errors

%

(Review ID: 101427)
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