IDL / CORBA

hi all, first, i apologize if this topic is in the wrong forum, didn't find a better place though. i don't have any problem with the classpath.. :)
Problem description:
- i use jdk 1.5.0
- i'm running the orbd before i try to run the example :)
- i have no classpath problems
- trying to set up and run the IDL HelloWorld example, both server and client on the same machine.
- when running the server, i get the following problem/error after some waiting time on this instruction (all instructions before this one actually make no problems):
NamingContextExt ncRef = NamingContextExtHelper.narrow(objRef);
06.07.2005 10:31:45 com.sun.corba.se.impl.transport.SocketOrChannelConnectionImp
l <init>
WARNUNG: "IOP00410201: (COMM_FAILURE) Connection failure: socketType: IIOP_CLEAR
_TEXT; hostname: 192.168.1.104; port: 1049"
org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No
at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(Unknown Source)
at com.sun.corba.se.impl.logging.ORBUtilSystemException.connectFailure(Unknown Source)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(Unknown Source)
at com.sun.corba.se.impl.transport.SocketOrChannelConnectionImpl.<init>(Unknown Source)
at com.sun.corba.se.impl.transport.SocketOrChannelContactInfoImpl.createConnection(Unknown Source)
at com.sun.corba.se.impl.protocol.CorbaClientRequestDispatcherImpl.beginRequest(Unknown Source)
at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.request(Unknown Source)
at com.sun.corba.se.impl.protocol.CorbaClientDelegateImpl.is_a(Unknown Source)
at org.omg.CORBA.portable.ObjectImpl._is_a(Unknown Source)
at org.omg.CosNaming.NamingContextExtHelper.narrow(Unknown Source)
at HelloServer.main(HelloServer.java:65)
Caused by: java.net.ConnectException: Connection timed out: connect
at sun.nio.ch.Net.connect(Native Method)
at sun.nio.ch.SocketChannelImpl.connect(Unknown Source)
at java.nio.channels.SocketChannel.open(Unknown Source)
at com.sun.corba.se.impl.transport.DefaultSocketFactoryImpl.createSocket
(Unknown Source)
... 9 more
i followed all instructions in the example and cannot figure out what's wrong, also, i'm running the orbd..
i am really really happy if someone with more knowledge and experience could solve my problem!
thanks alot in advance!
greetings.

Check whether any other application is using port 1049. Or try changing the port of orbd.
You should also take care to pass the port num as argument to the server.

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You are correct.
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Memory leakage with oracle oci driver

I have developed a Solaris8 client/server application using the JAVA IDL CORBA implementation. The client sends requests to the server to update the database (database is Oracle 8.1.7 and I connect to it using oci oracle drivers). Requests are sent one at a time. No concurrent connections. I have a static connection that I establish with database once I start the server. If that connection is lost for any reason (timeout or database faliure) the application tries automatically to reconnect to database. I have noticed that if the new connection to database fails and an sql exception is thrown, memory used by the application process increases. This memory is not garbage collected so application hangs. I tried similar behaviour with the oracle thin driver and things went fine. There was no memory leakage.
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I have noticed
that if the new connection to database fails and an
sql exception is thrown, memory used by the
application process increases.
How have you noticed this?I noticed this using the command pmap under solaris it operating system
every time I test reconnecting to database I go and check the memory used by the application before after attepmting to reconnect:
/usr/proc/bin/pmap [myapp pid] | tail -1
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This memory is not
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Then it isn't a java problem. When java runs out of memory it throws a out of memory exception.Well I'm not saying it is a java problem for sure. I suspect that it might be oracle oci8 driver problem. I would appreciate if anyone can help in specifying teh source of the error.
I tried
similar behaviour with the oracle thin driver and
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since I can't use the thin driver because of failover
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I don't understand that last sentence at all.What I mean here is that instead of using the oci8 driver to connect to database I used the thin driver and kept everything else the same. I simulated the faliure to reconnect to database and based on the pmap command observations there was no memory leakage.
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Web servers just handle static content, like HTML pages.
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    string firstName;
    string lastName;
    string streetAddress;
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interface AddRecord
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    string getUser();
        recordSet getRecords();
// plus more stuffWhen my implementing class in the server tries to define the getRecords() method like so: public Record[] getRecords()
    Record r = null;
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I went into the Record.java that the idlj compiler generated, and it is a final, non-abstract class. What incantation do I need here?

Whoops; solved that one; the real question is this: My .idl file declares some methods that I want to call in my implementation, but the .java class generated by the idlj compiler doesn't show the methods. Here's the full idl:module hw5Corba
typedef sequence <string> columns;
struct Record
    long recordNumber;
    string firstName;
    string lastName;
    string streetAddress;
    string city;
    string country;
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    string eMail;
    string fax;
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interface AddRecord
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    void setStreetAddr(in string add);
    string getStreetAddr();
    void setCity(in string city);
    string getCity();
    void setCountry(in string country);
    string getCountry();
    void setEmail(in string email);
    string getEmail();
    void setPhone(in string phone);
    string getPhone();
    void setFax(in string fax);
    string getFax();
};Here's the method I expect to be able to implement: public Record[] getRecords()
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    Record[] allRecs;
    int index = 0;
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    try
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      ResultSet recs = s.executeQuery(selectAll);
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        index++;
      allRecs = new Record[index];
      //cycle through records again, adding each
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      index = 0;
      recs = s.executeQuery(selectAll);
      while(recs.next())
        r = new Record();
        r.setRecordNumber(recs.getInt(1));
        r.setFirstName(recs.getString(2));
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        r.setStreetAddr(recs.getString(4));
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* hw5Corba/Record.java
* Generated by the IDL-to-Java compiler (portable), version "3.0"
* from Record.idl
* Tuesday, November 20, 2001 10:08:15 PM CST
public final class Record implements org.omg.CORBA.portable.IDLEntity
public int recordNumber = (int)0;
public String firstName = null;
public String lastName = null;
public String streetAddress = null;
public String city = null;
public String country = null;
public String phone = null;
public String eMail = null;
public String fax = null;
public Record ()
} // ctor
public Record (int _recordNumber,
String _firstName, String _lastName,
String _streetAddress, String _city,
String _country, String _phone,
String _eMail, String _fax)
    recordNumber = _recordNumber;
    firstName = _firstName;
    lastName = _lastName;
    streetAddress = _streetAddress;
    city = _city;
    country = _country;
    phone = _phone;
    eMail = _eMail;
    fax = _fax;
} // ctor
} // class Record What do I need to do to implement these methods declared in the .idl file?

Caused by: weblogic.corba.cos.naming.NamingContextAnyPackage.NotFound: IDL:

I am recieving the following error , when I try to get home intervface by using JNDI name from sample java program
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If any one let me know solution, I 'll be gr8ful to u.
Regards,
Siva

Siva ramakrishna <> writes:
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you are looking up the wrong name or the thing did not get deployed
correctly.
andy
I am recieving the following error , when I try to get home intervface by using JNDI name from sample java program
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This program connects to a Cloudscape DB on the server, and works very well with servants that have only "string" types. It produces errors with strings that have user-defined or boolean return types.
I appreciate any help in this matter.
Gary Lance
[email protected]
Exception in thread "main" org.omg.CORBA.UNKNOWN:
vmcid: SUN minor code: 202 completed: Maybe at
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstruct orAccessorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:296)
at java.lang.Class.newInstance(Class.java:249)
at
com.sun.corba.se.internal.iiop.messages.ReplyMessage_1_2.ge
tSystemException(ReplyMessage_1_2.java:90)
at
com.sun.corba.se.internal.iiop.ClientResponseImpl.getSystemEx
ception(ClientResponseImpl.java:105)
at
com.sun.corba.se.internal.POA.GenericPOAClientSC.invoke
(GenericPOAClientSC.java:129)
at org.omg.CORBA.portable.ObjectImpl._invoke
(ObjectImpl.java:457)
at TeachApp._TeachingStub.getProfessors
(_TeachingStub.java:43)
at TeachEntry.getNames(TeachEntry.java:127)
at TeachEntry.<init>(TeachEntry.java:85)
at TeachEntry.main(TeachEntry.java:295)

I had this problem myself and I finally managed to crack it ...
Let's take an example IDL for reference
    typedef string<100> Name;
    struct PersonStruct {
        string age;
        Name    name;
    typedef sequence<PersonStruct> PersonSeq;
    interface PersonHandling {
        long getPersons(in string personId, in Name name, out PersonSeq persons);
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The most likely place where the error 202 is thrown is in the implementation class
     public int getPersons(String personId, String name, PersonSeqHolder persons) {
            PersonStruct a = new PersonStruct();
            a.age = "28";
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            return 0;
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IOP00710309: (INTERNAL) Worker thread Thread[p: default-threadpool; w: Idle,5,ORB ThreadGroup 0] caught throwable com.sun.corba.se.impl.orbutil.threadpool

Hi ,
I am seeing this issue while starting my managed server.
com.sun.corba.se.impl.orbutil.threadpool.ThreadPoolImpl$WorkerThread run
FINE: "IOP00710309: (INTERNAL) Worker thread Thread[p: default-threadpool; w: Idle,5,ORB ThreadGroup 0] caught throwable com.sun.corba.se.impl.orbutil.threadpool.TimeoutException when requesting work from work queue default-workqueue."
org.omg.CORBA.INTERNAL:   vmcid: SUN minor code: 309 completed: No
        at com.sun.corba.se.impl.logging.ORBUtilSystemException.workerThreadThrowableFromRequestWork(ORBUtilSystemException.java:6330)
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This became bug 6560301. And Sun pointed out that it was my bad in not handling spurious wakeups. Java 6 makes spurious wakeups more likely. (My experience is from "never" to "sometimes".)
More info at:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6560301

Is there some limitation for the numbers of CORBA objects under Java IDL

Operation System : Windows 98 Second Edition(4.10.2222)
Java 2 SDK version :
java version "1.4.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)
I have programmed a distributed application with java IDL.
there are a lot of CORBA objects in my application and all of those objects must registered with the same orb.
At the beginning,I launched 4 CORBA objects,which is the least number of CORBA objects needed to run my application,and the application runs well.Then I increased the number of CORBA objects gradually.But when the number of CORBA objects has been changed to 6,the application runs instably,that is, the application sometimes runs well,and sometimes it generates an error when I launched my client-side program,the error is as follow:
org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No
at com.sun.corba.se.internal.iiop.ConnectionTable.getConnection(ConnectionTable.java:161)
at com.sun.corba.se.internal.iiop.ConnectionTable.getConnection(ConnectionTable.java:65)
at com.sun.corba.se.internal.iiop.GIOPImpl.getConnection(GIOPImpl.java:67)
at com.sun.corba.se.internal.corba.ClientDelegate.createRequest(ClientDelegate.java:644)
at com.sun.corba.se.internal.corba.ClientDelegate.createRequest(ClientDelegate.java:586)
at com.sun.corba.se.internal.corba.ClientDelegate.is_a(ClientDelegate.java:838)
at org.omg.CORBA.portable.ObjectImpl._is_a(ObjectImpl.java:112)
at org.omg.CosNaming.NamingContextExtHelper.narrow(NamingContextExtHelper.java:73)
at Client.main(Client.java:19)
the NO.19 line in Client.java is :
NamingContextExt ncref = NamingContextExtHelper.narrow(comobj);
The COMM_FAILURE/SUN-201 means CONNECT_FAILURE.
This will happen if a client gets a reference to an object reference whose server is not yet started,or perhaps not yet initialized.
But I think I have waited for enough long time before launched Client.java?Can anybody help me?Thanks very much....

We are trying to connect to corba naming services using Apache/Tomcat5.0 .We are using servlets to call the Corba services.
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Properties p= new Properties();
p.setProperty("org.omg.CORBA.ORBInitialHost","ramesh");
p.setProperty("org.omg.CORBA.ORBInitialPort","1234");
p.setProperty("org.omg.CORBA.ORBClass","com.sun.corba.se.internal.iiop.ORB");
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nmref = NamingContextHelper.narrow(orb.resolve_initial_references("NameService"));
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=====================
when we run the program:
we are getting the error message:
org.omg.CORBA.COMM_FAILURE: vmcid: SUN minor code: 201 completed: No
at com.sun.corba.se.internal.iiop.ConnectionTable.getConnection(ConnectionTable.java:161)
at com.sun.corba.se.internal.iiop.ConnectionTable.getConnection(ConnectionTable.java:65)
at com.sun.corba.se.internal.iiop.GIOPImpl.getConnection(GIOPImpl.java:67)
at com.sun.corba.se.internal.corba.ClientDelegate.createRequest(ClientDelegate.java:644)
at com.sun.corba.se.internal.corba.ClientDelegate.createRequest(ClientDelegate.java:586)
at com.sun.corba.se.internal.corba.ClientDelegate.is_a(ClientDelegate.java:838)
at org.omg.CORBA.portable.ObjectImpl._is_a(ObjectImpl.java:112)
at org.omg.CosNaming.NamingContextExtHelper.narrow(NamingContextExtHelper.java:73)
at Client.main(Client.java:19)
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You need a parser - try Antlr (http://www.antlr.org/). I believe it comes with an IDL grammar.
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Thanks,
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- Don't transfer the Hashtable at all, but writea
server, which gives access to the Hashtableentries
I think what Martin means is: why not let yourserver
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first double-check, whether you can go this way,
before reading any further!
But anyway, if you want to look deeper into
serialization:
- Create an ObjectOutputStream consisting of a
ByteArrayOutputStream:
ByteArrayOutputStream baos = new
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ObjectOutputStream oos = new
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baos.toByteArray()- on the receiving side, create an ObjectInputStream
from the received byteArray:
ByteArrayInputStream bais = new
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ObjectInputStream ois = new
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(Hashtable)ois.readObject();This is only a very coares description of the process,
but should just give some pointers to the basic way to
serialization.So, in the client, I could:
Map m = new HashMap();
//fill m
baosSize = m.getsizeofm();//pseudo method
ByteArrayOutputStream baos = new ByteArrayOutputStream(baosSize);
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oos.flush();
baos.toByteArray()and in the server code, I could:
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Wide Character Strings support in WLE CORBA Servers IDL

From the WLE documentation i see that the IDL does not support wstring or wchar.
I have a requirement to pass back a multi-byte character to the clients. How can i achieve the same?
Also can i use wstrings within the code? Is the restriction only for the IDL?

Subha
If you are use Java Use char (see WLE documentations for detail mapping explainations.) If you are using C++ only work around I see is using IDL type long (CORBA::Long).
WChar are always reprsented as 16-bit Unicode character. That means Unicode can represent 65,536 (2^16) characters.
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"Subha Balaji" <[email protected]> wrote:
>
Hi!,
I have a server which needs to return multi-byte character info to the client applications? But i find that
wchar and wstring are not supported types in the IDL. So how can i achieve my requirements using
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How to get IDL file name from CORBA IOR string

hi, is it possible to get IDL file name from the IOR string? how?
regards

Hi,
I don't think so.
And if it was possible, which interface should be returned if
the referenced object implements more than one?
Regards.
Karl

CORBA IDL and JNI

Hello everybody,
I am trying to develop a CORBA server that implements a method written in C language. This method is making RPC calls to a UNIX remote host. The reason why I used a native language is because I did not find yet how to make RPC calls in Java (I guess it is not possible ...).
When I run a client invoking the remote (native) method on the server everything works fine. But when I run more than one client at the same time the JVM exits with a message "An unexpected exception has been detected in native code outside the VM".
I believe this is a problem with memory allocation in the native code but I have tested and re-tested the C code (by calling it from a java class) and it works fine. The problem only occurs when the client invokes the method using the ORB.
Did anybody experience this problem? Is there any known incompatibility between JNI and CORBA?
By the way, I am running in Red Hat Linux 7.0.
If anybody has any tips please give me some help ASAP.
Thanks,
Jo�o

1. I have CORBA clients invoking CORBA servers. CORBA servers use native code to process the request and callback the client.
2. Right! The server crashes due to some kind of invalid memory reference in the C code. I checked and double checked and there is a problem with a strcmp() function in the C code. something I really can not understand ...
I ended up by giving up on the JNI. I managed to make RPC calls directly from JAVA.
Thanks for your reply,
Jo�o

IDL / CORBA

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