Re: octave from java

[George Kousiouris]

Hi,

are you sure you are capturing output and error streams efficiently? 
There are many ways to do that, the most stable (we have tested it for 
hours of execution of octave through Java) is raising threads in order 
to capture output and error streams. You can find more info in the 
following link:
 http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html?page=4

You can also use java to octave library 
(http://kenai.com/projects/javaoctave/downloads), for parsing some info 
from java to octave.

We have also made a stable service oriented implementation of octave 
execution through web services and java. You can find an initial version 
of the code here:
http://irmosserviceeng.svn.sourceforge.net/viewvc/irmosserviceeng/trunk/Mapping/src/

that illustrates the usage of threads in order to raise octave 
executions and capture efficiently output and error streams.

hope it helps,
George


On 4/15/2011 11:47 AM, frank buloup wrote:
> Hello,
>
> I'm trying to use Octave from java but I'm facing a strange problem 
> that have already
> been encountered. From java program, I'm using Runtime exec to start 
> an external
> process, getting back input, output and error streams; sending command 
> using
> output stream and parsing the result from input stream. Everything is 
> working fine
> until a bad command is sent to Octave (a command containing a call to 
> a function
> from a package that has not been installed for instance) : octave 
> seems to crash
> and I 've not found any log file that could help me to debug something.
>
> This problem has already been encountered, please see thread :
>
> http://octave.1599824.n4.nabble.com/Octave-from-Java-td1630041.html#a1630055 
>
>
> Two points are mentioned from this thread :
>
> 1) Something has already been done in python using pipes or sockets - 
> At the begining of the thread
> 2) Using Runtime exec approach, you must use "--interactive" option 
> and read data in bytes - At the end of the thread
>
> My questions :
>
> 1) Is anybody know how to use pipes or sockets and can give me some 
> links, starting points
> that could help me ?
>
> 2) I did not understood the read "data in bytes". There is no 
> ByteBufferedReader class and
> from a BufferedReader there exist only a read(char[],offset,length) 
> method, but it reads chars,
> not bytes !!! Must we use a BufferedInputStream instead ?
>
> Thanks a lot for your help,
> frank
> _______________________________________________
> Help-octave mailing list
> address@hidden
> https://mailman.cae.wisc.edu/listinfo/help-octave


--

---------------------------

George Kousiouris
Electrical and Computer Engineer
Division of Communications,
Electronics and Information Engineering
School of Electrical and Computer Engineering
Tel: +30 210 772 2546
Mobile: +30 6939354121
Fax: +30 210 772 2569
Email: address@hidden

National Technical University of Athens
9 Heroon Polytechniou str., 157 73 Zografou, Athens, Greece