From dougo@ccs.neu.edu Tue Nov 25 00:31:12 1997
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Date: Tue, 25 Nov 1997 00:31:08 -0500 (EST)
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From: Doug Orleans <dougo@ccs.neu.edu>
To: "Roy Oberhauser" <roberhau@cup.hp.com>
Cc: ap-support@ccs.neu.edu, dem@ccs.neu.edu
Subject: Re: HP-UX demjava problems
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Roy Oberhauser writes:
 >  Does demjava 0.6.4 work with JDK1.1.3?

Yes, but it appears it does not with JavaCC 0.7pre6.

 > Java Compiler Compiler Version 0.7pre6 (Parser Generator)
 > Copyright (c) 1996, 1997 Sun Microsystems Inc.
 > (type "javacc" with no arguments for help)
 > Reading from file grammar.jj . . .
 > File "TokenMgrError.java" does not exist.  Will create one.
 > File "ParseException.java" does not exist.  Will create one.
[...]
 > gen/A.java:6: Class ParseError not found in throws.
 >   public static A parse(java.io.InputStream in) throws ParseError
 >                                                        ^
 > gen/A.java:7: Exception ParseException must be caught, or it must be declared
 > in
 >  the throws clause of this method.
 >     { return new Parser(in)._A(); }
 >                               ^

As of the pre6 version (which was just released a little while ago,
and I hadn't tested demjava with it yet), they renamed ParseError to
ParseException, which breaks demjava-0.6.4-generated code.  I will fix
this, but for now you'll need to use an earlier version of JavaCC,
e.g. 0.6 (which is what is installed at Northeastern).

 > Until I modified the demjava script shown below I got the following SIGSEGV
 > error:

Any segfault error is a bug in the Java virtual machine implementation
(or perhaps the JIT compiler, if there is one for HP-UX).  I don't use
any native methods, so any compliant virtual machine should not core
dump.  You're on your own with this, sorry.

 > I modified demjava as follows (why are these paths hardcoded?):

(Because I was too lazy to write a real install/config program that
would set the paths correctly-- I plan to look into using Jex or
something similar, but haven't gotten around to it.)

 > BTW, there is no src/test to check installation,

Yes, that's a doc bug, although I will probably add a simple test.

 > and the src/selftest gives
 > this error (after modifying GNUmakefile hardcoded paths as in demjava above):
 > 
 > [hppddev2:selftest-541]make test
 > ln -s ../Text.java
 > Usage: ln [-f] [-i] [-s] f1 f2
 >        ln [-f] [-i] [-s] f1 ... fn d1
 > gmake: *** [Text.java] Error 2

Oops, you'll have to fix the GNUmakefiles in the selftest directories--
I forgot that HP's ln program is broken.  Simply change the line

	ln -s ../$@

to

	ln -s ../$@ $@

and it should work correctly.  However, the selftest is mainly for my
own testing; it's not really meant for the user to run-- I just left
it in (as well as the source code) for curious hackers.

--Doug