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#!wml --include=..

#use wml::std::page

#use wml::std::lang

#use wml::fmt::isolatin

#use wml::std::case global=upper

#include 

The Open Runtime Platform (

url="http://orp.sourceforge.net/" name="ORP">) provides a

covenient and simple platform for both using and testing GNU

Classpath.  With the release of ORP 1.0.9, GNU Classpath's native

libraries are supported out of the box.

Steps to use ORP+GNU Classpath on GNU/Linux

Example assumes ORP 1.0.9, see above.  In the example, GNU Classpath sources

are in ~/src/classpath/.

  
Obtain 

       name="ORP"> from the Sourceforge project page

    
wget

    http://prdownloads.sourceforge.net/orp/orp-1.0.9.tgz

    
tar -xzvf orp-1.0.9.tgz

  
On some systems you might need to apply a patch to work around

  gcc compile problems

    
cd orp-1.0.9

    
patch -p1 < ~/src/classpath/resource/orp-1.0.9.patch

  
Build ORP

    
make NON_ORP_NATIVE_LIBS=-DNON_ORP_NATIVE_LIBS dbg

ORP should now be built and ready, orp-1.0.9/mains/orp/Linux/dbg/orp.

Using ORP+GNU Classpath on GNU/Linux

ORP needs to load shared libraries and the class library bytecode.

The recommended method is to use the environment variable

LD_LIBRARY_PATH to provide a colon separated list of directories in

which to look for GNU Classpath's shared libraries.  The example below

assumes the user built and installed GNU Classpath without modifing

the default prefix.

  
Set the LD_LIBRARY_PATH variable (assumes Bash shell)

    
export LD_LIBRARY_PATH=/usr/local/classpath/lib/classpath

  
Set the CLASSPATH variable (ORP doesn't yet use this but it

  makes the command line easier).

    
export CLASSPATH=/usr/local/classpath/share/classpath/:.

  
Running HelloWorld with ORP

    
Create a HelloWorld.java file and compile to a class file

    with jikes or gcj -C

    
orp-1.0.9/mains/orp/Linux/dbg/orp -swapjit 0 1 -classpath

    $CLASSPATH HelloWorld

ORP contains two JITs at this time.  By default ORP uses a

so-called JIT 3 and for some things it appears to have more problems

than when using JIT 1.  This is the reasoning behind adding the

-swapjit 0 1 argument to ORP.  ORP does not have the ability at this

time to execute raw bytecode and must use one of these two JIT

compilers.