sablevm-developer

[Sablevm-developer] Does SableVM exclude gnu.regex from its classpath?

[Roman K. <ro...@on...>]

Hi list.

I have come across a strange thing: While testing my application
knowledge-tracking, I got an exception:

java.lang.NoClassDefFoundError
   at java.lang.Class.initialize (Class.java:124)
   at java.util.regex.Pattern.Pattern (Pattern.java:88)
   at java.util.regex.Pattern.compile (Pattern.java:144)
   at java.util.regex.Pattern.compile (Pattern.java:126)
   at java.lang.String.replaceAll (String.java:1177)
   at com.knowledgetracking.nb.NBClass.learnFromText (NBClass.java:82)
   at com.knowledgetracking.nb.ClassificationScheme.learnFromText
(ClassificationScheme.java:141)
   at com.knowledgetracking.nb.NBEngine.learn (NBEngine.java:75)
   at com.knowledgetracking.nb.NBEngine.learn (NBEngine.java:37)
   at com.knowledgetracking.cli.learn.invoke (learn.java:29)
   at com.knowledgetracking.cli.learn.invoke (learn.java:45)
   at java.lang.reflect.Method.invokeNative (Method.java)
   at java.lang.reflect.Method.invoke (Method.java:556)
   at bsh.Reflect.invokeOnMethod (Unknown Source)
   at bsh.Reflect.invokeStaticMethod (Unknown Source)
   at bsh.Reflect.invokeCompiledCommand (Unknown Source)
   at bsh.Name.invokeLocalMethod (Unknown Source)
   at bsh.Name.invokeMethod (Unknown Source)
   at bsh.BSHMethodInvocation.eval (Unknown Source)
   at bsh.BSHPrimaryExpression.eval (Unknown Source)
   at bsh.BSHPrimaryExpression.eval (Unknown Source)
   at bsh.Interpreter.eval (Unknown Source)
   at bsh.Interpreter.source (Unknown Source)
   at bsh.Interpreter.main (Unknown Source)
   at java.lang.VirtualMachine.invokeMain (VirtualMachine.java)
   at java.lang.VirtualMachine.main (VirtualMachine.java:92)

looking at the code in java.util.regex.Pattern, it is clear that
gnu.regex.RESyntax is not found. Strange thing is, that gnu.regex is in
SableVM-Classpath and installed properly (I checked this). When I
explicitly include the path to SableVM-Classpath in the java-sablevm call,
then things work out right.

The good thing is, with this hack, and with the small patch I submitted to
Classpath-Bugreports for URLStreamHandler, my app seems to work fine with
SableVM. And this is a good sign, since this includes quite some
technologies, like JDBC (with MySQL driver), XML, Castor, and some of
libcommons-*.

Cheers,
/Roman

Re: [Sablevm-developer] Does SableVM exclude gnu.regex from its classpath?

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

Roman Kennke wrote:
> Hi list.
> 
> I have come across a strange thing: While testing my application
> knowledge-tracking, I got an exception:
> 
> java.lang.NoClassDefFoundError
...
> looking at the code in java.util.regex.Pattern, it is clear that
> gnu.regex.RESyntax is not found. Strange thing is, that gnu.regex is in
> SableVM-Classpath and installed properly (I checked this). When I
> explicitly include the path to SableVM-Classpath in the java-sablevm call,
> then things work out right.

This is weird.  Can you reproduce this with a minimal example you could 
share on this list?

> The good thing is, with this hack, and with the small patch I submitted to
> Classpath-Bugreports for URLStreamHandler, my app seems to work fine with
> SableVM. And this is a good sign, since this includes quite some
> technologies, like JDBC (with MySQL driver), XML, Castor, and some of
> libcommons-*.

This is great!  We should make sure all this work gets into the next 
SableVM release.

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

Re: [Sablevm-developer] Does SableVM exclude gnu.regex from its classpath?

[Roman K. <ro...@on...>]

Am Di, den 15.06.2004 schrieb Etienne Gagnon um 15:07:
> Roman Kennke wrote:
> > Hi list.
> > 
> > I have come across a strange thing: While testing my application
> > knowledge-tracking, I got an exception:
> > 
> > java.lang.NoClassDefFoundError
> ...
> > looking at the code in java.util.regex.Pattern, it is clear that
> > gnu.regex.RESyntax is not found. Strange thing is, that gnu.regex is in
> > SableVM-Classpath and installed properly (I checked this). When I
> > explicitly include the path to SableVM-Classpath in the java-sablevm call,
> > then things work out right.
> 
> This is weird.  Can you reproduce this with a minimal example you could 
> share on this list?

Here we go. Attached (i hope ;-> ) is a very simple example, which
throws an exception when called this way:

> $HOME/local/bin/sablevm TestStrangeClasspath

when called this way:
> $HOME/local/bin/sablevm -c
$HOME/local/share/sablevm/sablevm-classpath:. TestStrangeClasspath

everything works fine. Isn't this weird? I used SableVM and
SableVM-Classpath from bugfree branch.

/Roman

Re: [Sablevm-developer] Does SableVM exclude gnu.regex from its classpath?

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

Hi Roman,

Thanks a lot for the example.  It allowed me to actually find the source 
of the problem and fix it! :-)

I have checked-in the fix in current sablevm & sablevm-classpath staging 
(revision 2759).

I hope this helps.

Etienne

Roman Kennke wrote:
> Here we go. Attached (i hope ;-> ) is a very simple example, which
> throws an exception when called this way:
> 
>>$HOME/local/bin/sablevm TestStrangeClasspath
> 
> when called this way:
> 
>>$HOME/local/bin/sablevm -c
> 
> $HOME/local/share/sablevm/sablevm-classpath:. TestStrangeClasspath
> 
> everything works fine. Isn't this weird? I used SableVM and
> SableVM-Classpath from bugfree branch.

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