Help me prevent restarting my RMI server

I choose the RMI framework because I thought that this would support dynamic loading of classes. Now I'm beginning to doubt this feature, hope someone can fill in the blanks for me.
The clients are built using Java Web Start. I use RMI for authentication and transactions (application events, files, etc.). The interfaces I use in RMI are very loose, they take an Object as parameter and returns an Object. I wrote it that way because I didn't know what functionality I would need in the future.
Main problem: Compatibility issues when I rewrite classes on the client side....:
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
     java.io.InvalidClassException: jflex.rmi.RMIPostEvents; local class incompatible: stream classdesc serialVersionUID = 7574722854925780076, local class serialVersionUID = 8717205828862885031
     at sun.rmi.server.UnicastServerRef.dispatch(Unknown Source)
yadayadayadayada.....
How can get the RMI server to reload the client classes when this exception occurs? If I have to restart the RMI server everytime I modify RMI classes on the client the RMI technique is useless to me.
Thanks in advance.

OK, now I understand, and this is an interesting problem.
I would have expected RMI to have annotated all remotely loaded codebase namespaces with a session id, to prevent this type of thing from happening. Not good. Unfortunately this issue is in the 'deep-water' of RMI internal implementation. The only expert on this I know on this forum is ejp. If you're reading this Esmond, little help here, please!
It would seem that you are forced to also change the name of the implementation class of the JFlexServerTask implementation, or derive from it, a bit of a hassle for sure. Does the server hold persistent references to the loaded tasks? If not, the classes might be unloaded when the DGC runs, but again I am not sure of this. Also, you can never be sure when DGC will run. Otherwise it seems like over the long term, the server runtime could get pretty congested with unused classes.
I guess I have not run into this problem before since I generally I do not allow servers to accept code from clients. The reason being that if there is an error in the client implementation, it can easily crash the server, accidentally or intentionally. Authentication I generally handle by sending the client a random value, which it then hashes with its password. (SHA or MD5 are good) Your present scheme could be easily cracked, unless you are running RMI over SSL, since your authentication object would be sent in plaintext over the network.
However, I am guessing you want to send batch jobs to a server, on a highly trusted network. I'm not sure how to resolve the problem, this stumps me, and I have been doing this for a long time :-)

Similar Messages

Restart an rmi server after an exception

I am making a client server application in java /rmi
I have four clients forming a group on theserver and all of them have some state . Now if one of the mlogs off
I will get a remoteexception on the server . I would like to allow another user to log in in place of the this chap who logged off and continue from the last state of the object.
any clues?
even if I save the state of the object(some datastructures) when I first get an remoteexception ,
howwill I allow a new client to take the old one's place?

any ideas anyone>?

Need Help to Prevent DDOS at application layer to protect Web server ?

Please guide the solutions for DDOS attack. I am facing this attack and after some investigation I found some details what is up against me
Here are some details of the attack which is most similar in my situation.
In considering the ramifications of a slow denial of service attack against particular services, rather than flooding networks, a concept emerged that would allow a single machine to take down another machine's web server with minimal bandwidth and side effects on unrelated services and ports. The ideal situation for many denial of service attacks is where all other services remain intact but the webserver itself is completely inaccessible. Slowloris was born from this concept, and is therefore relatively very stealthy compared to most flooding tools.
Slowloris holds connections open by sending partial HTTP requests. It continues to send subsequent headers at regular intervals to keep the sockets from closing. In this way webservers can be quickly tied up. In particular, servers that have threading will tend to be vulnerable, by virtue of the fact that they attempt to limit the amount of threading they'll allow. Slowloris must wait for all the sockets to become available before it's successful at consuming them, so if it's a high traffic website, it may take a while for the site to free up it's sockets. So while you may be unable to see the website from your vantage point, others may still be able to see it until all sockets are freed by them and consumed by Slowloris. This is because other users of the system must finish their requests before the sockets become available for Slowloris to consume. If others re-initiate their connections in that brief time-period they'll still be able to see the site. So it's a bit of a race condition, but one that Slowloris will eventually always win - and sooner than later.
Slowloris also has a few stealth features built into it. Firstly, it can be changed to send different host headers, if your target is a virtual host and logs are stored seperately per virtual host. But most importantly, while the attack is underway, the log file won't be written until the request is completed. So you can keep a server down for minutes at a time without a single log file entry showing up to warn someone who might watching in that instant. Of course once your attack stops or once the session gets shut down there will be several hundred 400 errors in the web server logs. That's unavoidable as Slowloris sits today, although it may be possible to turn them into 200 OK messages instead by completing a valid request, but Slowloris doesn't yet do that.
Please suggest any solutions with product that can help to prevent this problem with some guidance of the feature of that product to specifically prevent this type of attack. I already a many cisco devices like ASA, IPS, Cisco guard etc. just need some guidance
An early response requested and it will be highly appreciated.

Hello Haseen
Any tool will have some sort of trend/chracterstic that can be used to filter or throttle it out. Take skype for an example; even with all its complexity vendors managed to find days to detect it on the network and take corrective actions. However its always a catch-up game, developers continually work to make their applications or protocols more stealthy and the vendors have to keep up with this challenge.
So you would need to understand this trend/chracterstic of the attack, and then filter out using an access control mechanism, IMHO the most appropriate would be a web application firewall (WAF), Cisco used to have one but I think it is EOS soon:
http://www.cisco.com/en/US/products/ps9586/index.html
F5 Networks have their ASM module:
http://www.f5.com/products/big-ip/application-security-manager.html
Other vendors also have some good tools.
Please rate if you find the applications helpful.
Regards
Farrukh

Problem in starting RMI server, please help!

Hi , all:
I am learning RMI from SUN's tutorial. I set all of program packages as same as the tutorial, compiled all of programs . and built all of the jar files, the server classes and the client classes.When I run the server, ComputeEngine, it did not work ,and the following messages were showed at command lines:
C:\RMI\doc>java -Djava.rmi.server.codebase=file:/c:\rmi\ann\public_html\classes/
-Djava.rmi.server.hostname=localhost -Djava.security.policy=java.policy eng
ine.ComputeEngine
ComputeEngine exception: access denied (java.net.SocketPermission 127.0.0.1:1099
connect,resolve)
java.security.AccessControlException: access denied (java.net.SocketPermission 1
27.0.0.1:1099 connect,resolve)
at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:272)
at java.security.AccessController.checkPermission(AccessController.java:
399)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1044)
at java.net.Socket.<init>(Socket.java:262)
at java.net.Socket.<init>(Socket.java:100)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirect
SocketFactory.java:25)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMaster
SocketFactory.java:120)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:499)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:190
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:174)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:318)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at java.rmi.Naming.rebind(Naming.java:160)
at engine.ComputeEngine.main(ComputeEngine.java:25)
Please give helps .
Thanks!

Thank.
Thank.
I have put them at the same directory, but is deos not work.
Something I am not sure.
On the SUN's tutorial , the follows is given:
Win32:
java -Djava.rmi.server.codebase=file:/c:\home\ann\public_html\classes/
-Djava.rmi.server.hostname=zaphod.east.sun.com
-Djava.security.policy=java.policy
engine.ComputeEngine
I changed hostname = localhost
I also changed the code of the server class given by tutorial :
String name = "//host/Compute" ;
to:
String name = "//localhost/Compute";
Should I make such changes?
Here is the server class given by the tutorial:
package engine;
import java.rmi.*;
import java.rmi.server.*;
import compute.*;
public class ComputeEngine extends UnicastRemoteObject
implements Compute
public ComputeEngine() throws RemoteException {
super();
public Object executeTask(Task t) {
return t.execute();
public static void main(String[] args) {
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
String name = "//host/Compute";
try {
Compute engine = new ComputeEngine();
Naming.rebind(name, engine);
System.out.println("ComputeEngine bound");
} catch (Exception e) {
System.err.println("ComputeEngine exception: " +
e.getMessage());
e.printStackTrace();

Problem in starting RMI server, help please

Hi , all:
I am learning RMI from SUN's tutorial. I set all of program packages as same as the tutorial, compiled all of programs . and built all of the jar files, the server classes and the client classes.When I run the server, ComputeEngine, it did not work ,and the following messages are showed at command lines:
C:\RMI\doc>java -Djava.rmi.server.codebase=file:/c:\rmi\ann\public_html\classes/
-Djava.rmi.server.hostname=localhost -Djava.security.policy=java.policy eng
ine.ComputeEngine
ComputeEngine exception: access denied (java.net.SocketPermission 127.0.0.1:1099
connect,resolve)
java.security.AccessControlException: access denied (java.net.SocketPermission 1
27.0.0.1:1099 connect,resolve)
at java.security.AccessControlContext.checkPermission(AccessControlConte
xt.java:272)
at java.security.AccessController.checkPermission(AccessController.java:
399)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:545)
at java.lang.SecurityManager.checkConnect(SecurityManager.java:1044)
at java.net.Socket.<init>(Socket.java:262)
at java.net.Socket.<init>(Socket.java:100)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirect
SocketFactory.java:25)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMaster
SocketFactory.java:120)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:499)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:190
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:174)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:318)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at java.rmi.Naming.rebind(Naming.java:160)
at engine.ComputeEngine.main(ComputeEngine.java:25)
Please give helps .
Thanks!

You are setting the security policy to the file named
java.policy, make sure that it is in the same
directory where you are invoking the java compiler.Thank.
I have put them at the same directory, but is deos not work.
Something I am not sure.
On the SUN's tutorial , the follows is given:
Win32:
java -Djava.rmi.server.codebase=file:/c:\home\ann\public_html\classes/
-Djava.rmi.server.hostname=zaphod.east.sun.com
-Djava.security.policy=java.policy
engine.ComputeEngine
I changed hostname = localhost
I also changed the code of the server class given by tutorial :
String name = "//host/Compute" ;
to:
String name = "//localhost/Compute";
Should I make such changes?
Here is the server class given by the tutorial:
package engine;
import java.rmi.*;
import java.rmi.server.*;
import compute.*;
public class ComputeEngine extends UnicastRemoteObject
implements Compute
public ComputeEngine() throws RemoteException {
super();
public Object executeTask(Task t) {
return t.execute();
public static void main(String[] args) {
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
String name = "//host/Compute";
try {
Compute engine = new ComputeEngine();
Naming.rebind(name, engine);
System.out.println("ComputeEngine bound");
} catch (Exception e) {
System.err.println("ComputeEngine exception: " +
e.getMessage());
e.printStackTrace();

[RMI] server/client, help me.

I have done a Chat with RMI, between a server and a client machine on my network.
The server start normaly, and the client manage to connect the server, but the server failed to connect the client.
Can Someone explain me why?
Here are the source files:
*********Client Distant****************
import java.rmi.*;
public interface ClientDistant extends java.rmi.Remote {
public void msg(Message m) throws RemoteException;
**********Client DistantImplementation**************
import java.io.*;
import java.net.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
import java.net.MalformedURLException;
public class ClientDistantImpl extends java.rmi.server.UnicastRemoteObject implements ClientDistant, Runnable {
String nom;
String nomServeur;
/** Constructs ClientDistantImpl object and exports it on default port.
public ClientDistantImpl(String nom, String nomServeur) throws RemoteException {
super();
this.nom = nom;
this.nomServeur= nomServeur;
Thread leThread = new Thread(this);
leThread.start();
/** Register ClientDistantImpl object with the RMI registry.
* @param name - name identifying the service in the RMI registry
* @param create - create local registry if necessary
* @throw RemoteException if cannot be exported or bound to RMI registry
* @throw MalformedURLException if name cannot be used to construct a valid URL
* @throw IllegalArgumentException if null passed as name
public static void registerToRegistry(String name, Remote obj, boolean create) throws RemoteException, MalformedURLException{
if (name == null) throw new IllegalArgumentException("le nom doit etre non vide");
try {
Naming.bind(name, obj);
} catch (AlreadyBoundException ex){
          throw new IllegalArgumentException("le nom est deja utilise");
} catch (RemoteException ex){
if (create) {
Registry r = LocateRegistry.createRegistry(Registry.REGISTRY_PORT);
r.rebind(name, obj);
} else throw ex;
/** Main method.
public static void main(String[] args) {
System.setSecurityManager(new RMISecurityManager());
try {
BufferedReader entree = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Entrez votre nom");
String nom = entree.readLine();
System.out.println("Entrez le nom de la machine serveur");
String nomServeur = entree.readLine();
ClientDistantImpl obj = new ClientDistantImpl(nom, nomServeur);
String machineLocale = InetAddress.getLocalHost().getHostAddress();
               System.out.println("Machine locale : "+machineLocale);
               String[] tab = Naming.list("//"+nomServeur);
               for(int i=0; i<tab.length; i++)
                    System.out.println(tab[i] + " est enregistre sur le registre du serveur");
ServeurChat sc = (ServeurChat) Naming.lookup("//"+nomServeur+"/serveurChat");
String url = "//"+machineLocale+"/"+nom;
sc.connect(url);
System.out.println("Entrez vos messages en terminant par FIN");
String mess = entree.readLine();
while(!mess.equalsIgnoreCase("FIN")) {
Message m = new Message(url, mess);
sc.msg(m);
mess = entree.readLine();
sc.disconnect(url);
          System.exit(1);
} catch (Exception ex) {
ex.printStackTrace();
public void msg(Message m) throws RemoteException {
System.out.println(m);
public void run() {
try {
registerToRegistry(nom, this, true);
} catch (Exception ex) {
ex.printStackTrace();
          System.exit(1);
****************Serveur Chat********************
import java.rmi.*;
public interface ServeurChat extends ClientDistant {
public void connect(String url) throws RemoteException;
public void disconnect(String url) throws RemoteException;
*****************Serveur Chat Implementation**********
import java.net.*;
import java.util.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.registry.*;
import java.net.MalformedURLException;
/** Unicast remote object implementing ServeurChat interface.
* @author Patrice Torguet
* @version 1.0
public class ServeurChatImpl extends UnicastRemoteObject implements ServeurChat {
Vector clients;
/** Constructs ServeurChatImpl object and exports it on default port.
public ServeurChatImpl() throws RemoteException {
super();
clients = new Vector();
public static void registerToRegistry(String name, Remote obj, boolean create) throws RemoteException, MalformedURLException{
if (name == null) throw new IllegalArgumentException("registration name can not be null");
try {
Naming.rebind(name, obj);
} catch (RemoteException ex){
if (create) {
Registry r = LocateRegistry.createRegistry(Registry.REGISTRY_PORT);
r.rebind(name, obj);
} else throw ex;
/** Main method.
public static void main(String[] args) {
System.setSecurityManager(new RMISecurityManager());
try {
String machineLocale = InetAddress.getLocalHost().getHostName();
System.out.println("Nom du serveur = serveurChat");
ServeurChatImpl obj = new ServeurChatImpl();
registerToRegistry("serveurChat", obj, true);
} catch (Exception ex) {
ex.printStackTrace();
public void disconnect(String url) throws RemoteException {
clients.removeElement(url);
public void msg(Message m) throws RemoteException {
Enumeration e = clients.elements();
String url = null;
while(e.hasMoreElements()){
try {
url = (String) e.nextElement();
if (!url.equalsIgnoreCase(m.url)) {
ClientDistant cl = (ClientDistant) Naming.lookup(url);
cl.msg(m);
} catch(Exception ex) {
ex.printStackTrace();
clients.removeElement(url);
public void connect(String url) throws RemoteException {
clients.addElement(url);
*************Message*********************
import java.io.*;
* @author Patrice Torguet
* @version
public class Message implements Serializable {
String url;
String msg;
/** Creates new Message */
public Message(String url, String msg) {
this.url = url;
this.msg = msg;
public String toString() {
return url + " : " + msg;
Thx for help.

This is the exception:
java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:350)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:137)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:124)
at java.net.Socket.<init>(Socket.java:268)
at java.net.Socket.<init>(Socket.java:95)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:20)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:115)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:494)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:169)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:78)
at ServeurChatImpl_Stub.connect(Unknown Source)
at ClientDistantImpl.main(ClientDistantImpl.java:85)

Urgent Help Required For Starting RMI server from servlet.

I am currently working on rmi project.
I want to send request to remote machine(Web host) where my application is from desktop client .For that we are using RMI.
I am writing servlet and inside it i am binding object to registry for rmi server.
which will be deployed on remote server.
code ....
Registry reg;
reg=LocateRegistry.createRegistry(1099);
Server server=new Server("server");//class whose remote object to be accessed
//extends unicast remote object.Implement ServerInt interface which extends Remote.
reg.bind("server",server);
When i am trying to access this object i am getting following exception.
javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalExcepti
on: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: ServerModule.ServerInt]
at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
at com.sun.jndi.toolkit.url.GenericURLContext.lookup(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
at RequstReplication.main(RequstReplication.java:27)
Caused by: java.rmi.UnmarshalException: error unmarshalling return; nested excep
tion is:
java.lang.ClassNotFoundException: ServerModule.ServerInt
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
... 4 more
Caused by: java.lang.ClassNotFoundException: ServerModule.ServerInt
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.rmi.server.LoaderHandler.loadProxyInterfaces(Unknown Source)
at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(Unknown Source)
at java.rmi.server.RMIClassLoader.loadProxyClass(Unknown Source)
at sun.rmi.server.MarshalInputStream.resolveProxyClass(Unknown Source)
at java.io.ObjectInputStream.readProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
... 5 more
I can access naming enumeration of registry and object bound to it.
by following program.I shows corect objects.
Context namingContext=new InitialContext();
NamingEnumeration<NameClassPair> e=namingContext.list("rmi:");
while(e.hasMore())
System.out.println(e.next().getName());
While when i start RMI server from simple java program i can access these objects from registry.
I am not getting what is problem problem.Is there any other way to send request?
Plese give quick response.

I am currently working on rmi project.
I want to send request to remote machine(Web host) where my application is from desktop client .For that we are using RMI.
I am writing servlet and inside it i am binding object to registry for rmi server.
which will be deployed on remote server.
code ....
Registry reg;
reg=LocateRegistry.createRegistry(1099);
Server server=new Server("server");//class whose remote object to be accessed
//extends unicast remote object.Implement ServerInt interface which extends Remote.
reg.bind("server",server);
When i am trying to access this object i am getting following exception.
javax.naming.CommunicationException [Root exception is java.rmi.UnmarshalExcepti
on: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: ServerModule.ServerInt]
at com.sun.jndi.rmi.registry.RegistryContext.lookup(Unknown Source)
at com.sun.jndi.toolkit.url.GenericURLContext.lookup(Unknown Source)
at javax.naming.InitialContext.lookup(Unknown Source)
at RequstReplication.main(RequstReplication.java:27)
Caused by: java.rmi.UnmarshalException: error unmarshalling return; nested excep
tion is:
java.lang.ClassNotFoundException: ServerModule.ServerInt
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
... 4 more
Caused by: java.lang.ClassNotFoundException: ServerModule.ServerInt
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.rmi.server.LoaderHandler.loadProxyInterfaces(Unknown Source)
at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
at sun.rmi.server.LoaderHandler.loadProxyClass(Unknown Source)
at java.rmi.server.RMIClassLoader$2.loadProxyClass(Unknown Source)
at java.rmi.server.RMIClassLoader.loadProxyClass(Unknown Source)
at sun.rmi.server.MarshalInputStream.resolveProxyClass(Unknown Source)
at java.io.ObjectInputStream.readProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
... 5 more
I can access naming enumeration of registry and object bound to it.
by following program.I shows corect objects.
Context namingContext=new InitialContext();
NamingEnumeration<NameClassPair> e=namingContext.list("rmi:");
while(e.hasMore())
System.out.println(e.next().getName());
While when i start RMI server from simple java program i can access these objects from registry.
I am not getting what is problem problem.Is there any other way to send request?
Plese give quick response.

RMI Server issuing commands to clients - help please

I am trying to setup 2 clients to respond when an RMI server sends them a message, however I have never done any distributed programming before.
Can anyone please post up some classes which show how to have a client listening and a server connecting to them in order to activate a method. I would be extremely grateful. If anyone knows of a web site or another similar resource with an example like this that would also be much appreciated...
Many thanks,
drawdE

Earlier responses pointed out something important:
when it comes to real communications, the roles of
client and server are frequently switched.Yes, but CONCEPTUALLY.
What you mean to say really, is that a process can be ASKED for some resource (then it would be acting like a "server") or it can ASK for a resource (it would be acting like a "client"). Please note that i said it ACTS like something. It is not the same thing as it REALLY BEING that thing substantially. What i'm driving at is that when you design an app, objects that make it up take dual roles at THAT LEVEL of their own operation, but universally (when you look at the ENTIRE app), things cannot switch around like that anytime they want. An RMI Server is just that: A server. Clients connect to it, and there's no reason for the server to want to connect to a client of its own volition. When you start doing that, you're messing around with WHAT IT MEANS to implement client/server arch.....For instance, the objects that make up of that talk to bound remote objects on the server, CAN act out this dual role: but not when you have a bird's eye view of the entire app.
Its bad design. Its bad practise.
>
At the "architectural" level - something I admit is
vague - I suggest that in the application described by
the original poster, the only distinctions between
client and server are
o There are multiple clients but only one server.What the original post doesnt seem to get is that there would be as many clients as servers if he succeeds.
o A client can register with a server for on-going
communications, In everything else i would agree, but not in RMI: its nature just forbids it, because it means implementing what is in the server-side......on the client-side, just so the client can be TALKED TO by the "one server", as you put it.
but not the reverse.
>
This last point is key to server-initiated
communications (using RMI). When a client registers
with a server, it passes a reference to an object that
extends Remote. The server holds onto this reference,
and when it has something to say to the clientlike what? RMI isnt built that way! the client talks to the server. End of story.
, then
the server calls a method of that remote objectimplying another server on the client-side!!! doesnt make sense at all.
>
Finally, It bears repeating in this forum: With RMI,
such "callbacks" will not work if the clients are
behind firewalls.Correct, but irrelevant: firewalls or no firewalls, WHY are you trying to do it in the first place?
It also bears repeating in this forum: RMI is client/server architecture in practice, but its the NATURE of RMI that forbids it from being used the way ANY OTHER C/S architecture out there is flexible.

Problem with lost of the access to the RMI server

Hi to all.
We have two applications. First one (master) provides to second (slave) through RMI service their data or other resources.
In the ordinary way all works fine. But if we need for some reason restart master application, slave can't access to the RMI service and calling of the method Naming.lookup(...) throws java.rmi.UnmarshalException: error unmarshalling return; nested exception is: java.io.EOFException
Interestingly, calling of method Namig.list(...) at this moment correctly returns an array of the names bound in the registry.
For completeness, in the time of restarting master application, classes of the RMI services are not changed and thus Stub/Skeleton classes are same on both sides.
What is reason for this behaviour? It is way to restart/restore RMI access of the slave application to the master without restarting server (Tomcat) of both applications?
Thank, Roman

Thank for your reply, but your suggestion not helped me now.
For registering and binding I used usual practices. Following snippets of code are inside method that perform initialization on application startup. I was trying three versions.
First version creates registry and binds service classes only. Without any checks.
try {
LocateRegistry.createRegistry(rmiPort);
String ip = Functions.getCurrentEnvironmentNetworkIp();
if (ip.startsWith("?"))
    throw new Exception("Can't retrieve application IP address.");
logger.info("Application IP address: " + ip);+
RMIServiceCommonImpl rmiServiceCommon = new RMIServiceCommonImpl();
String name = "rmi://" + ip + ":" + rmiPort + "/";
Naming.rebind(name + IRMIServiceCommon.RMI_SERVICE_COMMON_NAME, rmiServiceCommon);
catch (Exception e) {
logger.error("Failed to register RMI services: ", e);
}On first application start all is OK and client has no problem to access RMI service.
But if master application is restarted, calling of the method LocateRegistry.createRegistry(rmiPort); throws
java.rmi.server.ExportException: internal error: ObjID already in use
Since that, client can't access to the RMI service and following code (method Naming.lookup) throws
java.rmi.UnmarshalException: error unmarshalling return; nested exception is: java.io.EOFException
String name = "rmi://" + ConfigServlet.getProperty("rmiHostUrl") + "/";
IRMIServiceCommon service = (IRMIServiceCommon) Naming.lookup(name + IRMIServiceCommon.RMI_SERVICE_COMMON_NAME);Second version checks if registry exist and trying to get list of registered services. If services not exist Register is created.
try {
Registry reg = LocateRegistry.getRegistry(rmiPort);
String[] list = null;
try {
    list = reg.list();
catch (Exception ex) {
    // ignore
if (list == null || list.length == 0)
    LocateRegistry.createRegistry(rmiPort);
String ip = Functions.getCurrentEnvironmentNetworkIp();
if (ip.startsWith("?"))
    throw new Exception("Can't retrieve application IP address.");
logger.info("Application IP address: " + ip);
String name = "rmi://" + ip + ":" + rmiPort + "/";
RMIServiceCommonImpl rmiServiceCommon = new RMIServiceCommonImpl();
Naming.rebind(name + IRMIServiceCommon.RMI_SERVICE_COMMON_NAME, rmiServiceCommon);
catch (Exception e) {
logger.error("Failed to registering RMI services: ", e);
}Again, first start is OK.
In this case, after application restart, calling of method Naming.rebind() throws
java.lang.IllegalStateException at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1272)
INFO: Illegal access: this web application instance has been stopped already. Could not load eu.arachne.rmi.RMIServiceCommonImpl_Stub.
This exception is followed by similar exceptions, but differs in class names (stubs) - java.rmi.server.RemoteStub, java.rmi.server.RemoteObject, java.rmi.dgc.Lease, java.rmi.dgc.VMID, java.rmi.server.UID
Of course, client application can't access to the service.
The third version first unbinds all services and then performs binding again.
if (list == null || list.length == 0)
LocateRegistry.createRegistry(rmiPort);
else {
for (int ii = 0; ii < list.length; ii++)
    Naming.unbind(name + list[ii]);
}But again, rebinding fail as I mentioning above.
I don't know... :-( How I can solve this problem?
Thank, Roman

Detect & re-register in Rmi Server

Hi,
I am running rmi registry in separate console. My application is registering an URL in RMI server. Now I am stopping rmi registry & restarting it again.
Now rmi registry is a new process & all previous registration entries are gone. So my application has to re-register.
How my application can detect that rmi server is stopped & restarted so that I can re-register it again?
Any help?
Here is my code where I am registering
public void initializeExternalManagementInterface(String serviceURL)
mbeanServer = MBeanServerFactory.createMBeanServer();
String domain = m_mbeanServer.getDefaultDomain();
String mbeanObjectNameStr = domain + ":type=" + EXTERNAL_MBEAN_CLASS_NAME + ",index=1";
objectName = ObjectName.getInstance(mbeanObjectNameStr);
Attribute serviceURLAttribute = new Attribute("ServiceURL", serviceURL);
m_mbeanServer.setAttribute(m_mbeanObjectName, serviceURLAttribute);
public void startManagementInterface(String jmxServiceURL, String mbeanClassName)
env.put(RMIConnectorServer.JNDI_REBIND_ATTRIBUTE,"true");
JMXServiceURL p_jmxServiceURL = new JMXServiceURL(jmxServiceURL);
LoggerManager.getLogger().info("Starting JMX Server: " + p_jmxServiceURL);
m_mbeanServerConnector = JMXConnectorServerFactory.newJMXConnectorServer(p_jmxServiceURL, env, m_mbeanServer);
m_mbeanServerConnector.start();
LoggerManager.getLogger().info("THE MANAGEMENT INTERFACE STARTED FOR SERVICE URL :" + jmxServiceURL);
m_jmxConnector = JMXConnectorFactory.connect(p_jmxServiceURL, null);
m_mbeanConnection = m_jmxConnector.getMBeanServerConnection();
String domain = m_mbeanConnection.getDefaultDomain();
m_mbeanObjectName = new ObjectName(domain + ":type=" + mbeanClassName + ",index=1");
}

Hi,
My application has a Watchdog process. It monitors few managed & unmanaged processes. If any process goes down due to some reason then it is responsibility of watchdog to restart it again.
Rmi registry is one of the unmanaged process for watchdog. So if Rmi stops or killed due to some reason then Watchdog restarts it successfully but the problem is my application has to re register again.
I want to know how my application can find out that Rmi registry is restarted so lets register again.
Note: Watchdog process has no way to communicate my application that rmi is restarted so my application has to care it self.
Suggest me if you have any solution.
Thanks & regards,
Jack

RMI Server and Provider Services

Hi Everyone,
Can I know whats the role of Planning RMI server and Provider Services. On what specific situations do we need to restart those??
Thanks in Advance

Any help on this please!!

Runtime exception by rmi server

Hi all,I need a help regarding this issue.iam having the following error on the logs.The only way to fix thi issue was restarting the managed server and it got resolved.Is there any resaon for the cause of this issue,as the code is moving to production i want to make sure to identify what could be the reason to get this error.Any help is greatly appreciated.
<<WLS Kernel>> <> <> <1300456918029> <BEA-080003> <RuntimeException thrown by rmi server: javax.management.remote.rmi.RMIConnectionImpl.getAttribute(Ljavax.management.ObjectName;Ljava.lang.String;Ljavax.security.auth.Subject;)
javax.management.RuntimeMBeanException: javax.management.RuntimeMBeanException: MBean getAttribute failed: java.lang.NullPointerException.
javax.management.RuntimeMBeanException: javax.management.RuntimeMBeanException:MBean getAttribute failed: java.lang.NullPointerException
at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.rethrow(DefaultMBeanServerInterceptor.java:856)

I am suffering the same problem, any fix for this problem??

Error while registering RMI Server

Hi
I have a system connected to bradband with a static ip. I am planning to use this as the RMI server and any system connected to the internet as the client. Is this possible....?
I tried to bind the name to the registry and I get the following error.
C:\PROGRA~1\Java\jre1.5.0_06\bin>java -Djava.security.policy=policy HelloServer
HelloServer error: Connection refused to host: 59.144.28.215; nested exception i
s:
        java.net.ConnectException: Connection refused: connect
java.rmi.ConnectException: Connection refused to host: 59.144.58.215; nested exc
eption is:
        java.net.ConnectException: Connection refused: connect
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(Unknown Source)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(Unknown Source)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(Unknown Source)
        at sun.rmi.server.UnicastRef.newCall(Unknown Source)
        at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
        at java.rmi.Naming.rebind(Unknown Source)
        at HelloServer.main(HelloServer.java:18)
Caused by: java.net.ConnectException: Connection refused: connect
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(Unknown Source)
        at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
        at java.net.PlainSocketImpl.connect(Unknown Source)
        at java.net.SocksSocketImpl.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.connect(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at java.net.Socket.<init>(Unknown Source)
        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(Unknown S
ource)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(Unknown S
ource)
        ... 7 moreCan anyone help me by resolving this error.....

what do you mean by intranet address?
If you use some NAT device (e.g, DSL, cable) that it is likely you won't be able to access the registry using the external IP address. In such case you need to open the registry port in the firewall.

Help needed in running the RMI application with multiple clients

Hi
I have my RMI application with one server and 6 clients. I keep all the server and client programs in the same directory. When i run the clients, the first 2 clients work properly but when the third or the fourth client starts, it works normally in getting the data and after a while it crashes. If teh third crashes the 4th works and if the 4th crashes the 3rd, 4th and 5th works ...randomly atleast one or 2 clients crash always.
following is the error message generated for a client named controller:
[ code ]
Exception in thread "main" java.lang.NullPointerException
at PostOfficeImpl.isinputAvail(PostOfficeImpl.Java:315)
at PostOfficeImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:375)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:240)
at sun,rmi.transport.Transport$1.run(Transport.java:153)
at java.security.AccessController.doPrivileged(Native Method)
at sun,rmi.transport.Transport.serviceCall(Transport.java:149)
at sun,rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
at sun,rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
at java.lang.Thread.run(Thread.java:595)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:247)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:223)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:343)
at PostOfficeImpl_Stub.isinputAvail(Unknown Source)
at CONTROLLER.main(CONTROLLER.java:167)
my ser ver program is as follows:
class PostOfficeServer extends java.rmi.server.UnicastRemoteObject implements java.rmi.Remote {
// Instance of ourselves
public static String name;
private static PostOfficeServer rmi;
// public No-argument constructor
public PostOfficeServer() throws RemoteException {
     super();
public static void main(String[] args){
if(System.getSecurityManager() == null) {
     System.setSecurityManager(new RMISecurityManager());
try {
     new PostOfficeServer();
     PostOffice postOfficeserver = new PostOfficeImpl();
try {
     getIP ipAdd1 = new getIP();
     String ip1 = ipAdd1.getIP();
     name = "//" + ip1 + "/PostOffice";
catch (Exception e){
     System.out.println();
Naming.rebind(name, postOfficeserver);
System.out.println("RemoteServer bound");
System.out.println("initialise Data Structure");
postOfficeserver.initDatastructure();
System.out.println("initilised");
catch (java.rmi.RemoteException e) {
     System.out.println("Cannot create remote server object");
catch (java.net.MalformedURLException e) {
     System.out.println("Cannot look up server object");
System.out.println("Server started.");
System.out.println("Enter <CR> to end.");
try {
     int serve2end = System.in.read();
}catch (IOException ioException) {
System.exit(0);
//endoffilePlease advise as this is very urgent

Hi
the following is the code for PostOfficeImpl...its a long code but i include it so that I get your help please...
import java.io.*;
import java.net.*;
import java.lang.*;
import java.rmi.*;
import java.rmi.server.*;
import java.rmi.RemoteException;
import java.util.HashMap;
import java.util.*;
public class PostOfficeImpl extends java.rmi.server.UnicastRemoteObject implements PostOffice {
//Implementations must have an explicit constructor in order to declare the
//RemoteException exception
public PostOfficeImpl() throws java.rmi.RemoteException {
     super();
public static LinkedListImpl list = new LinkedListImpl();
public static oListImpl ovarList = new oListImpl();
public static iListImpl ivarList =new iListImpl();
public static lipsList llfirst;
public static oList opchannel, ofirst, onext;
public static iList ipchannel, ichan, ifirst;
public static String[] variNumber= new String[100];
public static String[] inoutChan, inChan, outChan,inVAR, invarLIST,outVAR, outvarLIST ;
public static String[][] driveMat;
DriverMatrix_mthds drive = new DriverMatrix_mthds();
private static Boolean All_Vacant;
private static Boolean tAll_Vacant;
public void sendAll_Vacant(Boolean All_Vacant) throws RemoteException {
     tAll_Vacant = All_Vacant;
public Boolean getAll_Vacant() throws RemoteException{
      return tAll_Vacant;
public void initDatastructure() throws RemoteException{
ifirst = null;
ofirst=null;
int i=0, j=0, k=0, ind1=0, ind2=0;
try{/// initialise list
     drive = new DriverMatrix_mthds();
     drive.VarTypeArray();
     drive.nodeHeadVarType();
     String[] variablel = drive.Variablelist();
     drive.lipsvariablist();
     drive.NodeOrigin();
drive.nodeInput();
     drive.numOfnodes();
     drive.noOfVariables();
     drive.Assignlist();
     drive.novarType();
     drive.varNameType();
     drive.nodeNumName();
     drive.driverMat();
     String[][] lookupvar = drive.varNameType();
     //tempdrive = drive.driverMat();
     long leng1 = variablel.length;
     int varlistlength = (int) leng1;
     int counter;
     String s1="";
     String s2="";
     String s3 = "";
     String s4 = "";
     String s6 = "";
     int s5=0, c=0;
     while(variablel[k] !=null){
          k=k+1;
     int i1, j1;
     String varname, varnumber;
     varnumber = "";
while(i<=variablel.length-1){
     if(variablel!=null){
     c=c+1;
     i=i+1;
try{
     ind1=0; ind2 = 0;i=0;
while(!(variablel[i].equals("end of file"))){
     s1 = variablel[i];
     i=i+1;
     s2 = variablel[i];
     i=i+1;
     System.out.println("     " + s1+"     "+s2);
while(!(variablel[i].equals("end of input variable"))){
     s4 = variablel[i];
     i1=0;
     Brkwhile:while(i1<=lookupvar.length-1){
     j1=1;
     if(lookupvar[i1][j1] != null){
     if(lookupvar[i1][j1].equals(s4)){
          s3 = lookupvar[i1][0];
          break Brkwhile;
     i1=i1+1;
//ifirst.varNum = varnumber;
s5 = 0;
s6 = null;
ifirst= new iList(s3,s4, s5, s6);
ivarList.add(ifirst);
System.out.println(s3+"     "+s4+"     "+s5+"     "+s6);
i=i+1;
i = i + 1;
System.out.println("input list finished ");
while(!(variablel[i].equals("end of output variable"))){
     s4 = variablel[i];
     i1=0;
     j1=1;
     Brkwhile:while(lookupvar[i1][j1] != null){
          if(lookupvar[i1][j1].equals(s4)){
          s3 = lookupvar[i1][0];
          break Brkwhile;
     i1=i1+1;
     s5 = 0;
     s6 = null;
     ofirst= new oList(s3,s4, s5, s6);
     ovarList.add(ofirst);
     System.out.println(s3+"     "+s4+"     "+s5+"     "+s6);
     i=i+1;
     llfirst = new lipsList(s1, s2, ivarList, ovarList);
     list.add(llfirst);
     System.out.println("output list finished ");
     i=i+1;
     catch (NullPointerException ne){
     catch (Exception d){}
public int isitOK(reqPacket sndNodetail)
     throws RemoteException{
     String nodnum = sndNodetail.srcNum;
     String varnum = sndNodetail.varNum;
     int status = 0;
     llfirst = list.getFirst();
     try{mainbegin:while (llfirst != null){
          if((llfirst.nodeNum).equals(nodnum)){
          ofirst = ovarList.getFirst();
          while(ofirst != null){
               if((ofirst.varNum).equals(varnum)){
               if(ofirst.varVal==null){
               status = 1;
               break mainbegin;
     ofirst = ofirst.next;
     llfirst = llfirst.next;
     catch (NullPointerException nl){}
     return status;
public int senData(dataPacket sendToRTS)
     throws RemoteException{
dataPacket datDetail = sendToRTS;
String nnum, vnum,typename, dval;
String dtype = "";
nnum = datDetail.nodeNum;
vnum = datDetail.varNum;
typename = datDetail.dataType;
dval = String.valueOf(datDetail.dataVal);
String [][] tempdrive, varnametype;
int status =0;
System.out.println("data received is from node " nnum " is "+ dval+"var num " +vnum);
status =0;
try{
//DriverMatrix_mthds drive = new DriverMatrix_mthds();
drive.VarTypeArray();
drive.Variablelist();
drive.NodeOrigin();
drive.nodeInput();
drive.numOfnodes();
drive.noOfVariables();
String[][] lookupvar = drive.novarType();
drive.varNameType();
drive.nodeNumName();
drive.driverMat();
tempdrive = drive.driverMat();
String varname="";
int i,j;
//with the recived var name get the var num
for(i=0; i<=lookupvar.length-1; i++){
     j=0;
     if(lookupvar[i][j] != null){
          if(lookupvar[i][j].equals(typename)){
               dtype = lookupvar[i][1];
     }//varname is moved to dtype n used for checking
     for(i=0; i<=tempdrive.length-1; i++){j=0;
     if (tempdrive[i][j] != null){
     if (tempdrive[i][0].equals(vnum)){
          if (tempdrive[i][1].equals(nnum)){
          if(tempdrive[i][2].equals(dtype)){
          status = 1;
     }//System.out.println("received data " vnum " "+ nnum +" " + dtype +" "+dval);// after checking status if the status is 1 then set the counter n olist// to no of times the value has to be ditributed
int Ccount =0;
//opchannel = llfirst.olist;
try{
     System.out.println("status"+status);
     if (status == 1){
          llfirst = list.getFirst();
     mainWhile: while (llfirst != null){
          if((llfirst.nodeNum).equals(nnum)){
               ofirst = ovarList.getFirst();
               while(ofirst != null){
               if((ofirst.varNum).equals(vnum)){
                    ofirst.varVal =dval;
                    //setting the counter for the varname
                    //check driver matrix fr the no of occurances
               for(i=0; i<=tempdrive.length-1; i++){
               j=0;
               if (tempdrive[i][j] != null){
                    if (tempdrive[i][0].equals(vnum)){
                    for(j= j+3;j<=tempdrive.length-1;j++){
                    if(tempdrive[i][j] != null){
                    if(tempdrive[i][j].equals("1")){
                    Ccount = Ccount + 1;
System.out.println("count"+Ccount);
ofirst.counter = Ccount;
ofirst.varNum = vnum;for(i=0; i<=lookupvar.length-1; i++){
for(j=0; j<=2; j++){
     if(lookupvar[i][j] != null){
     if(lookupvar[i][j].equals(vnum)){
          varname = lookupvar[i][1];
     ofirst.varName = varname;
     Ccount=0;
     break mainWhile;
     ofirst = ofirst.next;
     llfirst = llfirst.next;
     catch(NullPointerException s){}
/*use the vnum in the driver matrix and find out the nodes to which this variable
*has been sent as input , i mean destination nodes..
*find the node numbers ..knowing the node numbers parse through data structure
and set the input values to value and status 1./
llfirst = list.getFirst();
while(llfirst != null){
     ifirst = llfirst.ilist.getFirst();
     while(ifirst != null){
          if (ifirst.varNum.equals(vnum)){
          ifirst.varStat = 1;
          ifirst.varVal = dval;
          //     System.out.println("nodenum "+llfirst.nodeNum+" varval     " + ifirst.varVal +"     stat "+ifirst.varStat+" vnum " + ifirst.varNum);
     ifirst=ifirst.next;
     llfirst=llfirst.next;
     catch (Exception e){};
     return status;
public int isinputAvail(reqPacket inputReq)
     throws RemoteException{
     String srcnum = inputReq.srcNum;
     String varnum = inputReq.varNum;
     int availstatus =0;
     llfirst = list.getFirst();
     //System.out.println("llfirst.nodeNum     "+ llfirst.nodeNum);
     whileloop:while (llfirst != null){
          if((llfirst.nodeNum).equals(srcnum)){
          ifirst = llfirst.ilist.getFirst();
          breakloop: while(ifirst != null){
          //System.out.println("var num " + varnum + "     " + "status outside" + ifirst.varStat);
          if((ifirst.varNum).equals(varnum)){
          if (ifirst.varStat == 1){
               availstatus = 1;
               ifirst.varStat = 0;
               // System.out.println("var num " + varnum + "     " + "status" + availstatus);
               break whileloop;
     ifirst = ifirst.next;
     llfirst = llfirst.next;
     //System.out.println("var num " + varnum + "     " + "status" + availstatus);
     return availstatus;
public dataPacket senDatatoNode(reqPacket sendFromRTS)
     throws RemoteException {
     String nnum, vnum, dtype, dval;
     //nnum = "";
     dtype="";
     //opchannel = llfirst.olist;
     //     ipchannel = llfirst.ilist;
     reqPacket sendfromrts = sendFromRTS;
     nnum = sendfromrts.srcNum;
     vnum = sendfromrts.varNum;
     //     dtype = sendFromRTS.dataType;
     dval = "";
     int ctrchk=0;
     try{
     //send data to process node n reduce the counter by 1
     llfirst = list.getFirst();
          mainWhile: while (llfirst != null){
          if((llfirst.nodeNum).equals(nnum)){
          ofirst = llfirst.olist.getFirst();
     whileofirst: while(ofirst != null){
          if((ofirst.varNum).equals(vnum)){
          dval = ofirst.varVal;
          ofirst.counter = ofirst.counter - 1;
          //     System.out.println(ofirst.counter);
          ctrchk=ofirst.counter;
          break whileofirst;
     ofirst = ofirst.next;
//set the status of respective input channel to 0 as data has been sent
     ifirst = llfirst.ilist.getFirst();
     if(ctrchk == 0){
     whileifirst: while(ifirst != null){
          if((ifirst.varNum).equals(vnum)){
          //ifirst.varVal = dval;
          ifirst.varStat =0;
          break whileifirst;
     llfirst = llfirst.next;
     //System.out.println(llfirst);
     catch(NullPointerException s){}
//find type
try{
     DriverMatrix_mthds driver = new DriverMatrix_mthds();
     driver.VarTypeArray();
     driver.Variablelist();
     driver.NodeOrigin();
     driver.nodeInput();
     driver.numOfnodes();
     driver.noOfVariables();
     driver.novarType()     ;
     String[][] lookupvar = driver.varNameType();
     int i, j;
     String varNum = vnum;
     for(i=0; i<=lookupvar.length-1; i++){
          j=0;
          if(lookupvar[i][j] != null){
          if(lookupvar[i][j].equals(vnum)){
          dtype = lookupvar[i][2];
     catch (Exception d){}
     dataPacket retpac = new dataPacket(nnum, vnum, dtype, dval);
     System.out.println("msg sent "+ nnum +"     " + vnum+" "+ dtype+"     "+ dval);
     return retpac;
public String findnodeName(String nodeNum)
     throws RemoteException{
String nnum = nodeNum;
llfirst = list.getFirst();
while (llfirst != null){
     if((llfirst.nodeNum).equals(nnum)){
     return llfirst.nodeName;
     llfirst = llfirst.next;
     System.out.println("node Number does not match with the list of node numbers generated..try again");
     return null;
//find the nodenum given the node name
public String findnodenum(String nodename)
     throws RemoteException{
     String nodenumber ="";
     String nodname = nodename;
     try{DriverMatrix_mthds driver = new DriverMatrix_mthds();
     driver.VarTypeArray();
     driver.Variablelist();
     driver.NodeOrigin();
     driver.nodeInput();
     driver.numOfnodes();
     driver.noOfVariables();
     driver.novarType()     ;
     driver.varNameType();
     String[][] lookupnode = driver.nodeNumName();
     int i, j;
     for(i=0; i<=lookupnode.length-1; i++){
     for(j=0; j<=2; j++){
          if(lookupnode[i][j] != null){
          if(lookupnode[i][j].equals(nodname)){
               nodenumber = lookupnode[i][2];
     catch (Exception d){}
     return nodenumber;
public String findvarnum(String variablename)
     throws RemoteException{
     String varnumber = "";
     try{
     DriverMatrix_mthds driver = new DriverMatrix_mthds();
     driver.VarTypeArray();
     driver.Variablelist();
     driver.NodeOrigin();
     driver.nodeInput();
     driver.numOfnodes();
     driver.noOfVariables();
     driver.novarType()     ;
     String[][] lookupvar = driver.varNameType();
     int i, j;
     String varname = variablename;
     for(i=0; i<=lookupvar.length-1; i++){
     for(j=0; j<=2; j++){
          if(lookupvar[i][j] != null){
          if(lookupvar[i][j].equals(varname)){
               varnumber = lookupvar[i][0];
catch (Exception d){}
return varnumber;
public String findvartype(String varname)
     throws RemoteException{
     String vartype = "";
     try{
     DriverMatrix_mthds driver = new DriverMatrix_mthds();
     driver.VarTypeArray();
     driver.Variablelist();
     driver.NodeOrigin();
     driver.nodeInput();
     driver.numOfnodes();
     driver.noOfVariables();
     driver.novarType();
     String[][] lookupvar = driver.varNameType();
     int i, j;
     String varName = varname;
     for(i=0; i<=lookupvar.length-1; i++){
     for(j=0; j<=2; j++){
          if(lookupvar[i][j] != null){
          if(lookupvar[i][j].equals(varName)){
               vartype = lookupvar[i][2];
catch (Exception d){}
return vartype;
public String findtypenum(String vartype){
String varnum = "";int i;
try{
     DriverMatrix_mthds driver = new DriverMatrix_mthds();
     driver.VarTypeArray();
     driver.Variablelist();
     driver.NodeOrigin();
     driver.nodeInput();
     driver.numOfnodes();
     driver.noOfVariables();
     String varNum[][] =      driver.novarType()     ;
     String varType = vartype;
     for(i=0; i<=9-1; i++){
          if(varNum[i][0] != null){
          if(varNum[i][0].equals(varType)){
               varnum = varNum[i][1];
catch (Exception d){}
return vartype;
//return input variable list
public String[] inoutchanlist(String nodenum, String nodenam)
     throws RemoteException{
try{
     DriverMatrix_mthds drive = new DriverMatrix_mthds();
     String[] varLIST = drive.Variablelist();
     int i=0;int j;
     while(varLIST[i]!=null){
          i=i+1;
     int arrlength = i;
     inoutChan = new String[arrlength];
     i=0; j=0;
     WHILELOOP:
     while(!(varLIST[i].equals("end of file"))){
     while(varLIST[i].equals(nodenum)){
          i=i+1;
          while(varLIST[i].equals(nodenam)){
               i=i+1;
               while(!(varLIST[i].equals("end of input variable"))){
                    inoutChan[j] = varLIST[i];
                    i=i+1;
                    j=j+1;
          System.out.println("endofinput");
          inoutChan[j]="endofinchan";
          j=j+1;
          i=i+1;
          while(!(varLIST[i].equals("end of output variable"))){
     inoutChan[j] = varLIST[i];
     i=i+1;
     j=j+1;
     System.out.println("endofoutput");
     inoutChan[j]="endofoutchan";
     break WHILELOOP;
     i=i+1;
     arrlength =j;
     for(j=0; j<=arrlength-1; j++){
     System.out.println(inoutChan[j]);
     catch (Exception e){}
     return inoutChan;
public String[] inchannel(String[] inoutChan) throws RemoteException{
int count=0;int i=0, j=0;
System.out.println("entered");
while(inoutChan[count]!=null){
     System.out.println(count + " " +inoutChan[count]);
     count=count+1;
     inChan = new String[count];
     while(!(inoutChan[i].equals("endofinchan"))){
     inChan[j] =inoutChan[i];
     j=j+1; i=i+1;
return inChan;
public String[] outchannel(String[] inoutChan) throws RemoteException{
int count=0;int i=0, j=0;
System.out.println("entered");
while(inoutChan[count]!=null){
     System.out.println(count + " " +inoutChan[count]);
     count=count+1;
     outChan = new String[count+1];
     while(!(inoutChan[i].equals("endofinchan"))){
          i=i+1;
     i=i+1;
     while(!(inoutChan[i].equals("endofoutchan"))){
          outChan[j] =inoutChan[i];
          j=j+1; i=i+1;
     return outChan;
public String[] invarChan(String nodename, int guardno)throws RemoteException{
try{
DriverMatrix_mthds drive = new DriverMatrix_mthds();
invarLIST = drive.invarlist();
int i=0;int j;
while(invarLIST[i]!=null){
     i=i+1;
     int arrlength = i;
     inVAR = new String[arrlength];
     i=0; j=0;
          WHILELOOP: while(!(invarLIST[i].equals("end of file"))){
               if (invarLIST[i].equals(nodename)){
     i=i+1;
     while(!(invarLIST[i].equals(nodename+String.valueOf(guardno)))){
     i=i+1;}
     i=i+1;
     while(!(invarLIST[i].equals("endofguard"))){
     System.out.println(invarLIST[i]);inVAR[j]=invarLIST[i]; i=i+1; j=j+1;}
     break WHILELOOP;}
     i=i+1;}
}catch (Exception d){}
return inVAR;
public String[] outvarChan(String nodename, int guardcount)throws RemoteException{
     try{
     DriverMatrix_mthds drive = new DriverMatrix_mthds();
     outvarLIST = drive.outvarlist();
     int i=0;int j;
     while(outvarLIST[i]!=null){
          i=i+1;
     int arrlength = i;
     outVAR = new String[arrlength];
     i=0; j=0;
     WHILELOOP: while(!(outvarLIST[i].equals("end of file"))){
          if (outvarLIST[i].equals(nodename)){
               i=i+1;
               while(!(outvarLIST[i].equals(nodename+String.valueOf(guardcount)+"guard"))){
                    i=i+1;}
          i=i+1;
          while(!(outvarLIST[i].equals("end guard"))){
          System.out.println(outvarLIST[i]);outVAR[j]=outvarLIST[i]; i=i+1; j=j+1;}
          break WHILELOOP;}
     i=i+1;}
}catch (Exception d){}
return outVAR;
private static Boolean start;
private static Boolean tstart;
public void sendstart(Boolean start) throws RemoteException {
     tstart = start;
public Boolean getstart() throws RemoteException{
     return tstart;
private static Boolean done;
private static Boolean tdone;
public void senddone(Boolean done) throws RemoteException {
     tdone = done;
public Boolean getdone() throws RemoteException{
     return tdone;
private static Boolean vac_busy1;
private static Boolean tvac_busy1;
public void sendvac_busy1(Boolean vac_busy1) throws RemoteException {
     tvac_busy1 = vac_busy1;
public Boolean getvac_busy1() throws RemoteException{
     return tvac_busy1;
private static int cus1_rit1;
private static int tcus1_rit1;
public void sendcus1_rit1(int cus1_rit1) throws RemoteException {
     tcus1_rit1 = cus1_rit1;
public int getcus1_rit1() throws RemoteException{
     return tcus1_rit1;
private static int cus1_rit2;
private static int tcus1_rit2;
public void sendcus1_rit2(int cus1_rit2) throws RemoteException {
     tcus1_rit2 = cus1_rit2;
public int getcus1_rit2() throws RemoteException{
     return tcus1_rit2;
private static int cus1_rit3;
private static int tcus1_rit3;
public void sendcus1_rit3(int cus1_rit3) throws RemoteException {
     tcus1_rit3 = cus1_rit3;
public int getcus1_rit3() throws RemoteException{
     return tcus1_rit3;
private static int cus1_it1;
private static int tcus1_it1;
public void sendcus1_it1(int cus1_it1) throws RemoteException {
     tcus1_it1 = cus1_it1;
public int getcus1_it1() throws RemoteException{
     return tcus1_it1;
private static int cus1_it2;
private static int tcus1_it2;
public void sendcus1_it2(int cus1_it2) throws RemoteException {
     tcus1_it2 = cus1_it2;
public int getcus1_it2() throws RemoteException{
     return tcus1_it2;
private static int cus1_it3;
private static int tcus1_it3;
public void sendcus1_it3(int cus1_it3) throws RemoteException {
     tcus1_it3 = cus1_it3;
public int getcus1_it3() throws RemoteException{
     return tcus1_it3;
private static int stkit_11;
private static int tstkit_11;
public void sendstkit_11(int stkit_11) throws RemoteException {
     tstkit_11 = stkit_11;
public int getstkit_11() throws RemoteException{
     return tstkit_11;
private static int stkit_12;
private static int tstkit_12;
public void sendstkit_12(int stkit_12) throws RemoteException {
     tstkit_12 = stkit_12;
public int getstkit_12() throws RemoteException{
     return tstkit_12;
private static int stkit_13;
private static int tstkit_13;
public void sendstkit_13(int stkit_13) throws RemoteException {
     tstkit_13 = stkit_13;
public int getstkit_13() throws RemoteException{
     return tstkit_13;
private static int c1_it1;
private static int tc1_it1;
public void sendc1_it1(int c1_it1) throws RemoteException {
     tc1_it1 = c1_it1;
public int getc1_it1() throws RemoteException{
     return tc1_it1;
private static int c1_it2;
private static int tc1_it2;
public void sendc1_it2(int c1_it2) throws RemoteException {
     tc1_it2 = c1_it2;
public int getc1_it2() throws RemoteException{
     return tc1_it2;
private static int c1_it3;
private static int tc1_it3;
public void sendc1_it3(int c1_it3) throws RemoteException {
     tc1_it3 = c1_it3;
public int getc1_it3() throws RemoteException{
     return tc1_it3;
//endoffile

Error while Restarting weblogic application server

Hi,
While Restarting weblogic application server (10.3 installed on linux) we are getting following error :
<Aug 10, 2010 2:47:08 PM IST> <Info> <WebLogicServer> <BEA-000377> <Starting WebLogic Server with Java HotSpot(TM) Client VM Version 10.0-b19 from Sun Microsystems Inc.>
<Aug 10, 2010 2:47:08 PM IST> <Info> <Management> <BEA-141107> <Version: WebLogic Server Temporary Patch for CR376251 Wed Aug 06 09:19:34 PDT 2008
WebLogic Server Temporary Patch for CR371247 Sat Aug 09 20:10:38 PDT 2008
WebLogic Server Temporary Patch for CR377673 Tue Aug 12 20:39:50 EDT 2008
WebLogic Server Temporary Patch for CR377673 Tue Aug 12 20:39:50 EDT 2008
WebLogic Server Temporary Patch for CR376759 Thu Aug 14 14:53:02 PDT 2008
WebLogic Server 10.3 Fri Jul 25 16:30:05 EDT 2008 1137967 >
<Aug 10, 2010 2:47:11 PM IST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to STARTING>
<Aug 10, 2010 2:47:11 PM IST> <Info> <WorkManager> <BEA-002900> <Initializing self-tuning thread pool>
<Aug 10, 2010 2:47:12 PM IST> <Notice> <Log Management> <BEA-170019> <The server log file /usr/ebiz/bea/user_projects/domains/portal_dmz_domain/servers/AdminServer/logs/AdminServer.log is opened. All server side log events will be written to this file.>
Exception in thread "VDE Transaction Processor Thread" java.lang.OutOfMemoryError: Java heap space
at com.octetstring.vde.Entry.readBytes(Entry.java:506)
at com.octetstring.vde.Entry.<init>(Entry.java:98)
at com.octetstring.vde.backend.standard.TransactionProcessor.run(TransactionProcessor.java:234)
<Aug 10, 2010 2:48:03 PM IST> <Error> <EmbeddedLDAP> <BEA-000000> <Error opening mapping file: /usr/ebiz/bea/user_projects/domains/portal_dmz_domain/servers/AdminServer/data/ldap/conf/mapping.cfg>
<Aug 10, 2010 2:48:03 PM IST> <Critical> <WebLogicServer> <BEA-000386> <Server subsystem failed. Reason: java.lang.InternalError
java.lang.InternalError
at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:752)
at sun.misc.URLClassPath.getResource(URLClassPath.java:168)
at java.net.URLClassLoader$1.run(URLClassLoader.java:192)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
Truncated. see log file for complete stacktrace
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:114)
at java.util.jar.JarFile.<init>(JarFile.java:133)
at java.util.jar.JarFile.<init>(JarFile.java:70)
at sun.misc.URLClassPath$JarLoader.getJarFile(URLClassPath.java:643)
Truncated. see log file for complete stacktrace
>
<Aug 10, 2010 2:48:03 PM IST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to FAILED>
<Aug 10, 2010 2:48:03 PM IST> <Error> <WebLogicServer> <BEA-000383> <A critical service failed. The server will shut itself down>
<Aug 10, 2010 2:48:03 PM IST> <Notice> <WebLogicServer> <BEA-000365> <Server state changed to FORCE_SHUTTING_DOWN>
x86_64 is not a supported Linux hardware platform for Autonomy.
Please suggest. Its liitle urgent. Any help will be appriciated.
Thanks and regards,
Minal Bhatte

May be all classes cant be loaded.
Do you have any application which is deployed your manage server? If you say Yes:
There are three ways:
1)If Sun JVM is used, then add:
set MEM_ARGS=-Xms1280m -Xmx1280m -XX:PermSize=128m -XX:MaxPermSize=256m
*** -XX:PermSize and -XX:MaxPermSize should be equal and quarter of -Xmx. (-Xmx should also be equal to -Xms)
If BEA JRockit JVM is used, then add:
set MEM_ARGS=-Xms1280m -Xmx1280m
2) If you still get that error, increase your real memory of system.
3) For last choice, contact with your developer to tune your application.

Help me prevent restarting my RMI server

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