[omniORB] interoperability of DII requests

[William Bauder]

I'm not too familiar with jacorb or RMI-IIOP, but here goes anyway:

> 12:12:40,052 ERROR  sys : [STDERR] org.omg.CORBA.MARSHAL: unknown 
> value tag: 0x6 (offset=0x88)  vmcid: 0x0  minor code: 0  completed: No
> 12:12:40,052 ERROR  sys : [STDERR]      at  
> org.jacorb.orb.CDRInputStream.read_value(CDRInputStream.java:2446)

I'm guessing that "unknown value tag" means that it's looking for a
typecode, but doesn't recognize it.  However, 6 is the length of "Echo!"
(string length + 1 for null terminator).  I *think* jacorb is expecting
an Any, or Object, or something along those lines, but omniorb is just
sending a string.

Try varying the string that you're sending; see if the unknown value
tags matches the string length + 1.  

Unfortunately, I can't offer any suggestions on how to actually resolve
it, unless it's something obvious like the server method not taking a
string as a parameter.

-Bill



-----Original Message-----
From: omniorb-list-bounces at omniorb-support.com
[mailto:omniorb-list-bounces at omniorb-support.com] On Behalf Of Jason
Stelzer
Sent: Friday, July 06, 2007 4:02 PM
To: Jason Stelzer
Cc: omniorb-list at omniorb-support.com
Subject: Re: [omniORB] interoperability of DII requests



On Jul 6, 2007, at 12:58 PM, Jason Stelzer wrote:

> Hello, this is probably a self inflicted problem as I'm very new to 
> corba. But, there doesn't seem to be many good places to look for
> examples that apply to what I'm doing.
>
> Currently I'm working on getting an older application of ours to talk 
> to our newer ejb servers via corba. We're using java 1.5 on
> the server side with jboss 4.0.5GA. On the client side, I'm using  
> omniorb 4.1.0. At this point I've puzzled out how to get ejb3 beans  
> registered with jacorb in jboss. So, at this point I can look up  
> the remote interface to an ejb3 bean in the orb.
>
> I can connect to the jboss server and lookup the remote name service 
> on the C++ side.
>
> I can lookup objects and create requests. However, I believe I'm 
> either putting the request together wrong or need to declare things
> slightly differently.
>
> The bean I'm talking to is a glorified hello world bean. It takes a 
> string as an argument and returns a different string. The method
> never gets invoked. It looks like things are dying during the corba  
> marshalling of input. All I see in the jboss log is:
>
> 12:12:40,052 ERROR  sys : [STDERR] org.omg.CORBA.MARSHAL: unknown 
> value tag: 0x6 (offset=0x88)  vmcid: 0x0  minor code: 0  completed: No
> 12:12:40,052 ERROR  sys : [STDERR]      at  
> org.jacorb.orb.CDRInputStream.read_value(CDRInputStream.java:2446)
> 12:12:40,053 ERROR  sys : [STDERR]      at  
> org.jboss.iiop.rmi.marshal.CDRStream$StringReader.read
> (CDRStream.java:578)
> 12:12:40,053 ERROR  sys : [STDERR]      at  
> org.jboss.iiop.rmi.marshal.strategy.SkeletonStrategy.readParams 
> (SkeletonStrategy.java:128)
> 12:12:40,053 ERROR  sys : [STDERR]      at  
> org.jboss.ejb3.iiop.BeanCorbaServant._invoke(BeanCorbaServant.java: 
> 193)
> 12:12:40,054 ERROR  sys : [STDERR]      at  
> org.jacorb.poa.RequestProcessor.invokeOperation 
> (RequestProcessor.java:297)
> 12:12:40,054 ERROR  sys : [STDERR]      at  
> org.jacorb.poa.RequestProcessor.process(RequestProcessor.java:596)
> 12:12:40,054 ERROR  sys : [STDERR]      at  
> org.jacorb.poa.RequestProcessor.run(RequestProcessor.java:739)
> 12:12:40,054 INFO   sys : [controller] rid: 4 opname: echoString  
> invocation: system exception was thrown (org.omg.CORBA.MARSHAL:  
> unknown value tag: 0x6 (offset=0x88)  vmcid: 0x0  minor code: 0   
> completed: No)
>
>

As a followup, I've found that if I make void() calls, I get no  
errors. Logging shows the calls are made. However when I return or  
pass in strings I get exceptions related to marshalling the data. I'm  
not quite sure why.


--
J.



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