Hi Andrew,
Thank you very much for your reply.
On Sun, 2007-06-24 at 22:18 +0100, Andrew John Hughes wrote:
> > As part of my switch to a new job, I've been trying to convince my
> > employers to switch from C++ to java on an embedded ARM based platform.
> >
> > However, in order for the switch to be reasonably painless, we will need
> > a J2SE compliant (although we don't need any GUI components) runtime
> > environment for the embedded platform. I've been looking at various
> > alternatives based on GNU classpath (as well as a few others). They
> > include jamvm, mika, PERC, kaffe, gcj and a few more. So far, none of
> > the the platforms I've been looking at (except PERC, which is
> > prohibitively priced) support J2SE 5.0. Thus, my question is, can you
> > provide me with a pointer to a J2SE 5.0 JRE (GNU classpath based or
> > otherwise) which will run on an ARM Linux platform?
>
> Hi Søren,
>
> It really depends what you mean by a 'J2SE 5.0 JRE' -- what particular
> features have you found lacking in the solutions you've tried? GNU Classpath
> itself should support 95%+ of the 1.5 API, and, as of the 0.95 release, is
> only buildable with a 1.5 supporting compiler. Personally, I've been using
> JamVM with 1.5 stuff for about the last three years.
>
> If there is something missing, please file a bug with the respective project
> and let them know (GNU Classpath for library classes, the appropriate VM
> otherwise). Which version of gcj and kaffe did you try? These projects
> differ quite significantly between their current release versions and the
> version in their source repositories, and don't (as yet) directly use GNU
> Classpath, so there is some delay between code being written there and being
> imported into their own local tree.
>
> Hope that helps,
Thanks for your input.
JamVM and CACAO currently look to be the most promising candidates. I am
however having trouble with GNU classpath. Specifically, the
LinkedBlockingQueue and NetworkInterface classes. Hmm, I just now
realised that upgrading to Classpath 0.95 fixes the
NetworkInterface.getNetworkInterface() method.
Anyway, let me just run the error I am seeing by you, and if it's
genuine (and not due to a screw up on my part) I will file an
appropriate bug:
Running a simple program like this:
import java.util.concurrent.LinkedBlockingQueue;
public class LinkedBlockingQueueTest {
public static void main(String[] args) {
LinkedBlockingQueue<String> q = new LinkedBlockingQueue<String>();
try {
q.take();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
Results in the following error:
boll@mephisto:~/classes$ /usr/local/cacao/bin/cacao
LinkedBlockingQueueTest
Exception in thread "main" java.lang.IllegalMonitorStateException
at java.util.concurrent.locks.ReentrantLock
$Sync.tryRelease(ReentrantLock.java:126)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer.release(AbstractQueuedSynchronizer.java:1139)
at
java.util.concurrent.locks.ReentrantLock.unlock(ReentrantLock.java:430)
at
java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:368)
at LinkedBlockingQueueTest.main(LinkedBlockingQueueTest.java:9)
boll@mephisto:~/classes$
I am using classpath 0.95 and cacao with the following options:
Configure/Build options:
./configure:
'--with-classpath-classes=/usr/local/share/classpath/glibj.zip'
'--with-classpath-includedir=/usr/local/include/'
'--with-classpath-libdir=/usr/local/lib/' '--disable-disassembler'
CC : (4.1.2 (Ubuntu 4.1.2-0ubuntu4))
CFLAGS : -O2 -g3 -D__I386__ -D__LINUX__ -ansi -pedantic -Wall
-Wno-long-long -D_POSIX_C_SOURCE=199506L -D_XOPEN_SOURCE=500
-D_XOPEN_SOURCE_EXTENDED -D_BSD_SOURCE
Default variables:
maximum heap size : 134217728
initial heap size : 2097152
stack size : 65536
java.boot.class.path : /usr/local/cacao/share/cacao/vm.zip:/usr/local/share/classpath/glibj.zip
gnu.classpath.boot.library.path: /usr/local/lib//classpath
Runtime variables:
maximum heap size : 134217728
initial heap size : 2097152
stack size : 65536
libjvm.so : /usr/local/cacao/lib/libjvm
java.boot.class.path : /usr/local/cacao/share/cacao/vm.zip:/usr/local/share/classpath/glibj.zip
gnu.classpath.boot.library.path: /usr/local/lib//classpath
java.class.path : .
Again, thanks for your input.
--
Søren O.
"Oh, bother" said the Borg, "we've assimilated Pooh".
