Re: [Sablevm-developer] Re: [Sablevm-user] can't create vm

[Etienne G. <gag...@uq...>]

Or, even better...

You could do as suggested in the FAQ, and run sablevm as follows:

$ strace sablevm HelloWorld

If you don't have strace already installed on your Debian machine,
you can install it as follows:

$ su
$ apt-get install strace
$ exit

strace will give very long output, so you should probably write:

$ strace sablevm HelloWorld 2> strace.out

to send the error output into a file called "strace.out".  You
could then look at its content to try identifying the problem.
You should look for error messages in "open()" calls,
i.e. return value of -1 with an error code starting with an E, like
in the following:

open("/home/egagnon/work/share/sablevm/sablevm-classpath/java/lang/Object=
=2Eclass", O_RDONLY) =3D -1 ENOENT (No such file or directory)

If you are unable to decipher this, you can also send us a copy of
the strace.out file *IF* it is not too big (e.g. < 40 Kb of data).

Good luck!

Etienne
PS: My preferred debugger is ddd.  You can install it as shown above,
but with the command "apt-get install ddd".


Chris Pickett wrote:
> Hi,
>=20
> You can probably help most by learning a little of gdb and stepping
> through the execution.
>=20
> e.g.
> $ gdb sablevm TestProgram
> (gdb) break main <-- set a breakpoint in the main method
> (gdb) 'r' <-- for run
> (gdb) list <-- to list source
>=20
> and then use 's' (step) and 'n' (next) and 'break' to get to the proble=
m.
>=20
> Probably it is easier to run gdb through an interface like emacs (M-x
> gdb) or ddd, because they update where you are in the source file as yo=
u
> issue commands.  Personally I like emacs because it doesn't depend on X=

> -- try splitting emacs vertically with 'C-x 3' and then running gdb in
> one window / frame / whatever-they're-called -- I think the default
> splits horizontally and you don't get to see so much source at once.
>=20
> You're looking for a point where JNI_CreateJavaVM () returns JNI_ERR an=
d
> thus causes the "cannot create vm" message to be printed.
>=20
> Cheers,
> Chris
>=20
> P.S.  I can't add this to the wiki right now because I can't connect to=

> www.sablevm.org ...
>=20
> canning yuan wrote:
>=20
>>Hi, I'm the teammate of QianLi. Our problem isn't still unsolved.
>>We installed the sablevm as following:
>>=20
>>su
>>$ tar -xzvf sablevm-classpath-1.1.1.tar.gz
>>$ cd sablevm-classpath-1.1.1
>>$ ./build_classpath --no-gtk /usr/local
>>$ cd ..
>>$ tar -xzvf sablevm-1.1.1.tar.gz
>>$ cd sablevm-1.1.1
>>$ ./configure --enable-debugging-features --disable-no-reorder-blocks
>>                   --prefix=3D/usr/local
>>$ make
>>$ make install=20
>>But we get "can't create vm" error, when we run test program. we have=20
>>read the information in FAQ. But it still can't work.
>>Thanks in advance.
>>                                                                       =
                                            =20
>>
>>                                                                       =
       =20
>>canning
>>
>>
>>-----------------------------------------------------------------------=
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>=20
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>=20
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--=20
Etienne M. Gagnon, Ph.D.             http://www.info.uqam.ca/~egagnon/
SableVM:                                       http://www.sablevm.org/
SableCC:                                       http://www.sablecc.org/