Jamvm and Jxta

[Arigead]

Hello all,
    first post to this list, just signed up last night as I'm having a
problem with running Jxta on Jamvm. I'm trying to run Jxta on a gumstix
embedded system, amongst others but hit a problem when Jxta tries to
call java.lang.IsCompatibleWith()

I suppose I could try and get a hold of the jamvm source and investigate
why I'm getting a null pointer exception. If anybody has any ideas
please let me know as Java ain't my forte at all.

Thanks in advance


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[Robert Lougher]

Hi,

Which version of JamVM are you using?

Rob.

2009/9/24 Arigead <captain.deadly@...>:

> Hello all,
>    first post to this list, just signed up last night as I'm having a
> problem with running Jxta on Jamvm. I'm trying to run Jxta on a gumstix
> embedded system, amongst others but hit a problem when Jxta tries to
> call java.lang.IsCompatibleWith()
>
> I suppose I could try and get a hold of the jamvm source and investigate
> why I'm getting a null pointer exception. If anybody has any ideas
> please let me know as Java ain't my forte at all.
>
> Thanks in advance
>
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry® Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9-12, 2009. Register now!
> http://p.sf.net/sfu/devconf
> _______________________________________________
> Jamvm-general mailing list
> Jamvm-general@...
> https://lists.sourceforge.net/lists/listinfo/jamvm-general
>

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[Robert Lougher]

Hi John,

If you do:

jamvm -version

this will show the Java compatible version and the JamVM version,
which is what I'm interested in, e.g.:

java version "1.5.0"
JamVM version 1.5.3

...

Anyway, I found your thread here:

http://forums.java.net/jive/thread.jspa?threadID=66637&tstart=-1

One of the replies indicates that JXTA is doing a check involving:

Package.getPackage("java.lang").getSpecificationVersion()

which was returning NULL on their VM (from IBM).

On JamVM, this will also return NULL on versions before 1.5.3.  But it
works correctly on the lastest version:

class foo {
   static void main(String[] args) {
       System.out.println(Package.getPackage("java.lang").getSpecificationVersion());
   }
}

> jamvm -version

java version "1.5.0"
JamVM version 1.5.3

> jamvm foo
1.5

> jamvm -version

java version "1.5.0"
JamVM version 1.5.1

> jamvm foo

java.lang.NullPointerException
  at foo.main(foo.java:3)

Hope this helps,
Rob.

2009/9/24 Arigead <captain.deadly@...>:

> Hi Robert thanks for getting back to me I'm running the bitbake recipe
> from Openembedded which builds version 1.5
>
> I'm fairly sure Jxta working with SUN Java 1.5
>
> John
>
>
> Robert Lougher wrote:
>> Hi,
>>
>> Which version of JamVM are you using?
>>
>> Rob.
>>
>> 2009/9/24 Arigead <captain.deadly@...>:
>>> Hello all,
>>>    first post to this list, just signed up last night as I'm having a
>>> problem with running Jxta on Jamvm. I'm trying to run Jxta on a gumstix
>>> embedded system, amongst others but hit a problem when Jxta tries to
>>> call java.lang.IsCompatibleWith()
>>>
>>> I suppose I could try and get a hold of the jamvm source and investigate
>>> why I'm getting a null pointer exception. If anybody has any ideas
>>> please let me know as Java ain't my forte at all.
>>>
>>> Thanks in advance
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Come build with us! The BlackBerry® Developer Conference in SF, CA
>>> is the only developer event you need to attend this year. Jumpstart your
>>> developing skills, take BlackBerry mobile applications to market and stay
>>> ahead of the curve. Join us from November 9-12, 2009. Register now!
>>> http://p.sf.net/sfu/devconf
>>> _______________________________________________
>>> Jamvm-general mailing list
>>> Jamvm-general@...
>>> https://lists.sourceforge.net/lists/listinfo/jamvm-general
>>>
>>
>
>

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developing skills, take BlackBerry mobile applications to market and stay
ahead of the curve. Join us from November 9-12, 2009. Register now!
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