sablevm-developer

[Sablevm-developer] PR: ClassFormatError

[Andreas H. <ah...@mo...>]

Hello everybody,

I have run into a execution problem with SableVM. When I start the
program which is appended to this mail on LinuxPPC with SableVM I get
the following error message:

java.lang.ClassFormatError

When I execute it with kaffe on the same machine or with Sun's jre 1.4.2 on
Win2K it runs without any problems.

The program is written in jasmin assembly code. Don't wonder about the
weird code. It's the output of a brainfuck compiler I'm playing around
with at the moment.


Andreas

-- 
"UNIX was not designed to stop you from doing stupid things,
because that would also stop you
from doing clever things."  -- Doug Gwyn

Re: [Sablevm-developer] PR: ClassFormatError

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

Hi Andreas,

It's a problem with your class file, not a problem with SableVM.

Using Sun's JDK:

$ java -verify  BFprogram
Exception in thread "main" java.lang.ClassFormatError: BFprogram (Extra bytes at the end of the class file)
         at java.lang.ClassLoader.defineClass0(Native Method)
         at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
         at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
         at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
         at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
         at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
         at java.security.AccessController.doPrivileged(Native Method)
         at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
         at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
         at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
         at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
         at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)

ooO( lucky me! )  ;-)

Etienne
PS: SableVM has no verifier, yet it does actually enforce some basic
stuctural integrity rules on class files.

Andreas Heck wrote:
> Hello everybody,
> 
> I have run into a execution problem with SableVM. When I start the
> program which is appended to this mail on LinuxPPC with SableVM I get
> the following error message:
> 
> java.lang.ClassFormatError
> 
> When I execute it with kaffe on the same machine or with Sun's jre 1.4.2 on
> Win2K it runs without any problems.
> 
> The program is written in jasmin assembly code. Don't wonder about the
> weird code. It's the output of a brainfuck compiler I'm playing around
> with at the moment.
> 
> 
> Andreas
> 


-- 
Etienne M. Gagnon, Ph.D.             http://www.info.uqam.ca/~egagnon/
SableVM:                                       http://www.sablevm.org/
SableCC:                                       http://www.sablecc.org/