Note: libmagic is missing in the jamvm package, and therefore the package 'file' needs to be installed for network java programs to work. Solution found here: |Debugging jamvm and classpath - 'ipkg install file' solves the problem.

    ipkg install file (for networking)

Note: libmagic is missing in the jamvm package, and therefor the package 'file' needs to be installed for network java programs to work. Solution found here: |Debugging jamvm and classpath - 'ipkg install file' solves the problem.

1. Builds and passes tests on openwrt-brcm24;
2. Builds and passes tests on openwrt-ixp4xx;

3) Jython 2.2.1 (with a small patch) runs under CVM, pystone number on mssii

$ cvm -cp jython.jar org.python.util.jython Lib/test/pystone.py Pystone(1.1) time for 10000 passes = 20.986 This machine benchmarks at 476.508 pystones/second

See this msg for detail

4) Servlet with jetty.

On both your PC and your slug

 $ wget http://dist.codehaus.org/jetty/jetty-6.1.3.zip
 $ unzip jetty-6.1.3.zip

@]

On your PC, compile [@

Optware phoneme-advanced status (MR2? b34):

1. Builds and passes tests on unslung;
2. Builds and passes tests on slugosbe;
3. Builds and passes tests on mssii;
4. Builds and passes tests on openwrt-ixp4xx.

Optware phoneme-advanced status:

1) Builds and passes tests on unslung; 2) Builds but failed floating point tests on slugosbe. However the unslung ipk can run on slugobe passing all tests; 3) Builds and passes tests on openwrt-ixp4xx.

Sun has open sourced their J2ME JVM (called CVM) under the umbrella of "phoneme advanced" with GPL. It seems that CVM performs better than jamvm or kaffe on the slug.

The phoneme-advanced package has been added to the optware ipkg feed. You can simply install it by

 # ipkg update
 # ipkg install phoneme-advanced

@]

After installing phoneme-advanced ipk, the following shows a couple of things you can do:

1) Preliminary testing. [@

Transfer examples/embedded/target/classes/ to your slug,

 $ /usr/lib/jvm/j2sdk1.4.2_09/bin/javac -bootclasspath $J2ME?_HOME/lib/foundation.jar:$J2ME?_HOME/lib/btclasses.zip -classpath lib/servlet-api-2.5-6.1.3.jar:lib/jetty-util-6.1.3.jar:lib/jetty-6.1.3.jar -d examples/embedded/target/classes examples/embedded/src/main/java/org/mortbay/jetty/example/[MO]*.java

 $ cvm -cp lib/servlet-api-2.5-6.1.3.jar:lib/jetty-util-6.1.3.jar:lib/jetty-6.1.3.jar:examples/embedded/target/classes org.mortbay.jetty.example.MinimalServlets?

[@

@]

[@

@]

[@

@]

[@

@]

[@

@]

Sun has open sourced their J2ME JVM (called CVM) under the umbrella of phoneme advanced with GPL. It seems that CVM performs better than jamvm on the slug.

1) Preliminary testing.

2) Some Javascript scripting with rhino.

3) Servlet with jetty.

Sun has open sourced their J2ME? JVM (called CVM) under the umbrella of phoneme advanced with GPL. It seems that CVM performs better than jamvm on the slug.

An optware/make/phoneme-advanced.mk has been added. You can already build the phoneme-advanced package if you have the optware cross compilation environment. The package will be added to the ipkg feed as soon as we install Sun's JDK on the official build machine.

Assume you've installed the phoneme-advanced package, the following shows a couple of things you can do:

1. Preliminary testing.

 $ cvm -version
 Product: phoneME Advanced (phoneme_advanced_mr2-b18)
 Profile: Foundation Profile Specification 1.1
 JVM:     CVM phoneme_advanced_mr2-b18 (mixed mode)

 $ cvm -cp /opt/lib/java/phoneme-advanced/testclasses.zip HelloWorld?
 Hello world.

 $ cvm -cp /opt/lib/java/phoneme-advanced/testclasses.zip Test
 ... lots of output ...
 *CONGRATULATIONS: test Test completed with 411 tests passed and 0 failures
 *Output lines starting with a * should be checked for correctness
 *They can be compared to src/share/javavm/test/TestExpectedResult?

1. Some Javascript scripting with rhino.

 $ wget ftp://ftp.mozilla.org/pub/mozilla.org/js/rhino1_6R5.zip
 $ unzip rhino1_6R5.zip
 $ cd rhino1_6R5
 $ cvm -cp js.jar org.mozilla.javascript.tools.shell.Main
 Rhino 1.6 release 5 2006 11 18
 js> importPackage(java.util);
 js> print(new java.util.Date());
 Tue May 23 12:23:01 GMT 2007
 js> print(new Date());
 Tue May 23 2007 12:23:09 GMT-0000 (GMT)
 js> quit();

1. Servlet with jetty.

On both your PC and your slug

 $ wget http://dist.codehaus.org/jetty/jetty-6.1.3.zip
 $ unzip jetty-6.1.3.zip

On your PC, compile

 $ cd jetty-6.1.3
 $ /usr/lib/jvm/j2sdk1.4.2_09/bin/javac -bootclasspath $J2ME?_HOME/lib/foundation.jar:$J2ME?_HOME/lib/btclasses.zip  -classpath lib/servlet-api-2.5-6.1.3.jar:lib/jetty-util-6.1.3.jar:lib/jetty-6.1.3.jar -d examples/embedded/target/classes examples/embedded/src/main/java/org/mortbay/jetty/example/[MO]*.java

Transfer examples/embedded/target/classes to your slug,

 $ cvm -cp lib/servlet-api-2.5-6.1.3.jar:lib/jetty-util-6.1.3.jar:lib/jetty-6.1.3.jar:examples/embedded/target/classes org.mortbay.jetty.example.MinimalServlets?
 2007-05-22 22:52:12.024::INFO:  Logging to STDERR via org.mortbay.log.StdErrLog?
 2007-05-22 22:52:12.034::INFO:  jetty-6.1.3
 2007-05-22 22:52:12.313::INFO:  Started SocketConnector? @ 0.0.0.0:8080

 $ w3m -dump http://localhost:8080/
 Hello SimpleServlet?

• add this script in /opt/bin/javac if you like:

1. !/bin/sh

/opt/bin/jikes -classpath /opt/share/jamvm/classes.zip:/opt/share/classpath/glibj.zip $*

1) If using the Unslung release, the required packages can be installed as follows: (To date - 1 September 2005 - the packages do not yet exist in the OpenSlug ipkg repository, but the same result can be achieved by following the OpenSlugJavaInstallWorkaround)

1) If using the Unslung release, the required packages can be installed as follows: (For OpenSlug, the packages do not yet exist in the corresponding ipkg repository, but the same result can be achieved by usingb the OpenSlugJavaInstallWorkaround)

(NB - At present, this is only applicable for the unslung release; no comparable packages exist yet for OpenSlug - 31 Aug 2005)

(NB - At present, this is only applicable for the unslung release; no comparable packages exist for OpenSlug - 31 Aug 2005)

[21/03/05] Hmmm. if there's no JIT jamvm will be faster -- kaffe's interpreter is unoptimised, jamvm uses direct-threading and stack-caching. It's 5x faster on ppc, which again doesn't have a working JIT. Of course, the JIT is faster.

    ipkg install zlib

4) to run type:

   /opt/bin/jamvm Test

   bash-2.05b# jamvm Test
   hello world

   /opt/bin/jikes -classpath /opt/share/jamvm/classes.zip:/opt/share/classpath/glibj.zip  Test.java

4) to run type: /opt/bin/jamvm Test

    ipkg install classpath

    ipkg install jamvm

    ipkg install jikes

Note: if the procedure below does not work for you, please uninstall and then reinstall jamvm. After that it should work...

[15:13] <jacques> yeah only things in common are jikes - compiler, and they both use gnu classlib derived classlibs

[15:06] <jacques> rwhitby-away, kaffe is a JVM, like jamvm

[15:07] <dyoung-web> isnt the differnce sorta like dropbear vs openssh ?

[15:07] <jacques> very apt analogy

[15:07] <rwhitby-web> which is the openssh one :-)

[15:07] <jacques> kaffe

[15:08] <garpinc> That's why I did jamvm

[15:08] <kergoth> i hear good things about kaffe. iirc there's a dev or two of it that drop by #oe on occasion

[15:08] <jacques> it has its own classlib which is synced with gnu classlib relatively often

[15:08] <jacques> jikes it a java compiler - compiles jave source code into bytecode

[15:08] <garpinc> I synced directly with gnu classpath for my port

[15:08] <jacques> I tried to get kaffe going with JIT but it's broken for armeb (and possibly armel) right now

[15:09] <rwhitby-web> ok, let's put both alternatives (with the pros and cons of each) on that page. We do *not* need to decide between them :-)

[15:09] <rwhitby-web> (unless they are conflicting, in which case we will just mark them as such)

[15:10] <jacques> oh absolutely not - any more than we need to decide between openssh and dropbear - even less so actually since kaffe and jamvm and sablevm and ... can all coexist

[15:10] <jacques> but kaffe will kick jamvs's ass in speed

[15:10] <jacques> oops did I say that out loud?

[15:10] <garpinc> http://www.mail-archive.com/kaffe@kaffe.org/msg07533.html

[15:10] <garpinc> You're right jaques

[15:11] <garpinc> But jamvm will kick kaffee on memory won't it.

[15:12] <jacques> garpinc, well that's talking about if JIT is enabled in kaffe, which is broken for armeb right now

[15:12] <jacques> but still, kaffe has a lot of optimizations that jamvm does not have, and jamvm is absolutely tiny compared to kaffe - pros and cons

[15:12] <rwhitby-web> good, so it really is like dropbear and openssh - horses for courses

1) Install required packages:

    ipk install classpath

    ipk install jamvm

    ipk install jikes

2) Use your favorite editor (i.e: vi) to create a java program:

    filename: Test.java

    class Test {
       public static void main(String[] args) {

            System.out.println("hello world");

       }

    }

3) to compile type on one line:

   jikes -classpath /opt/share/jamvm/classes.zip:/opt/share/classpath/glibj.zip  Test.java

4) to run type: jamvm Test

bash-2.05b# jamvm Test\\

ipk install classpath

ipk install jamvm

ipk install jikes

Use your favorite editor (i.e: vi) to create a java program:

filename: Test.java

class Test {

   public static void main(String[] args) {

        System.out.println("hello world");

   }

}

to compile type on one line (ignore \) :

jikes -classpath /opt/share/jamvm/classes.zip:/opt/share/classpath/glibj.zip \ Test.java

to run type: jamvm Test

Example:

bash-2.05b# jamvm Test hello world