RMI Server

Alright guys I am trying to get a Simple RMI example running. I can run the registtry from the command prompt but cannot get the server started.
My command to run the server and the error are as follows
C:\Documents and Settings\John\jbproject\simple-rmi\classes>java -Djava.rmi.server.codebase=file:c:\Documents and Settings\John\jbproject\simple-rmi\classes\ -D
java.security.policy=file:c:\Documents and Settings\John\jbproject\simple-rmi\Si
mpleRMI.policy simple-rmi.SimpleRMIServer
Exception in thread "main" java.lang.NoClassDefFoundError
Any ideas, I am going crazy I have cjecked the paths individually using another command prompt and it is fine. Advice???

Please check that your program can find all necessary classes. It looks like your application is missing some classes. Check the "visibility" of your classes, their names etc. (public MyClass ..)
As the error says no class found... if you are using "package"-keyword please check that you are importing right classes from packages.(import packagename.YourClass...)

Similar Messages

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.

Attempting to use SSL over RMI from a web application to a RMI server

Hi,
I am attempting to use SSL over RMI to a server. The client is the web
application that is hosted on WebLogic and that attempts to connect to the
server. There is no client or server verification at either the client or
the server end. The code works outside of WebLogic 7/8 but has the following
issues when running the web application inside weblogic:
java.rmi.ConnectException: Connection refused to host: gkhanna1; nested
exception is:
java.net.ConnectException: Connection refused: connect
java.net.ConnectException: Connection refused: connect
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(RMIDirectSocketF
actory.java:20)
at
sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketF
actory.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.newCall(UnicastRef.java:313)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Naming.java:79)
at
com.hyperion.css.spi.impl.ntlm.NTLMConnectionClient.initConnection(NTLMConne
ctionClient.java:59)
at
com.hyperion.css.spi.impl.ntlm.NTLMConnectionClient.getUsers(NTLMConnectionC
lient.java:197)
at com.hyperion.css.CSSAPIImpl.getUsers(Unknown Source)
at com.hyperion.css.CSSAPIImpl.initialize(Unknown Source)
at com.hyperion.css.CSSAPIImpl.initialize(Unknown Source)
at jsp_servlet._jsp._app1.__app1signin._jspService(__app1signin.java:133)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(Servle
tStubImpl.java:1058)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:401)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:445)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:306)
at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(W
ebAppServletContext.java:5445)
at
weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManage
r.java:780)
at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:3105)
at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2588)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)
The code at the client that initiates the connection:
socketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
SSLSocket socket = (SSLSocket) socketFactory.createSocket(host, port);
socket.setEnabledCipherSuites(CIPHERS);
socket.setEnableSessionCreation(true);
Any ideas?
Thanks

I don't see anything that indicates SSL was directly a factor in the
failure.
From the exception stack it looks like a more basic connectivity issue,
maybe the URL for the
RMI server is incorrect for some reason or the server was down.
It looks like you are doing something like this:
SSL client -> WLS server with servletA, servletA RMI client
(com.hyperion.css) -> RMI server
The connection failure appears to be the connection from servletA RMI client
to the RMI server.
Is that a correct picture?
Tony
"Gaurav Khanna" <[email protected]> wrote in message
news:[email protected]...
Hi,
I am attempting to use SSL over RMI to a server. The client is the web
application that is hosted on WebLogic and that attempts to connect to the
server. There is no client or server verification at either the client or
the server end. The code works outside of WebLogic 7/8 but has thefollowing
issues when running the web application inside weblogic:
java.rmi.ConnectException: Connection refused to host: gkhanna1; nested
exception is:
java.net.ConnectException: Connection refused: connect
java.net.ConnectException: Connection refused: connect
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(RMIDirectSocketF
actory.java:20)
at
sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketF
actory.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.newCall(UnicastRef.java:313)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Naming.java:79)
at
com.hyperion.css.spi.impl.ntlm.NTLMConnectionClient.initConnection(NTLMConne
ctionClient.java:59)
at
com.hyperion.css.spi.impl.ntlm.NTLMConnectionClient.getUsers(NTLMConnectionC
lient.java:197)
at com.hyperion.css.CSSAPIImpl.getUsers(Unknown Source)
at com.hyperion.css.CSSAPIImpl.initialize(Unknown Source)
at com.hyperion.css.CSSAPIImpl.initialize(Unknown Source)
at jsp_servlet._jsp._app1.__app1signin._jspService(__app1signin.java:133)
at weblogic.servlet.jsp.JspBase.service(JspBase.java:27)
at
weblogic.servlet.internal.ServletStubImpl$ServletInvocationAction.run(Servle
tStubImpl.java:1058)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:401)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:445)
at
weblogic.servlet.internal.ServletStubImpl.invokeServlet(ServletStubImpl.java
:306)
at
weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(W
ebAppServletContext.java:5445)
at
weblogic.security.service.SecurityServiceManager.runAs(SecurityServiceManage
r.java:780)
at
weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletCo
ntext.java:3105)
at
weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java
:2588)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:213)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:189)
The code at the client that initiates the connection:
socketFactory = (SSLSocketFactory) SSLSocketFactory.getDefault();
SSLSocket socket = (SSLSocket) socketFactory.createSocket(host, port);
socket.setEnabledCipherSuites(CIPHERS);
socket.setEnableSessionCreation(true);
Any ideas?
Thanks

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.

Not able to run a simple RMI server

I am running an RMI program like follwing
import java.rmi.* ;
import java.rmi.registry.* ;
import java.rmi.server.* ;
public class CallBeanServer extends UnicastRemoteObject implements ICallBeanServer
     //main
     public static void main(String args[]) throws Exception
          int port = 1000 ;
          Registry reg = null ;
          if( args[0].equals("true"))
               reg = LocateRegistry.createRegistry(port) ;
               System.out.println("Successfully created registry") ;
          else
               reg = LocateRegistry.getRegistry(port) ;
               System.out.println("Connected to existing registry") ;
          CallBeanServer callBeanServer = new CallBeanServer(reg) ;
     }//main
     //constructor
     public CallBeanServer(Registry reg) throws Exception, RemoteException
          super() ;
          reg.rebind("CallBeanServer",this) ;
          System.out.println("CallBeanServer Object bound") ;
     //my public method
     public String callBeanServer() throws RemoteException
     {          return "Success" ;
I have run the rmiregistry at port no 1000 like
rmiregistry 1000
I have compiled ICallBeanServer also and run rmic also over CallBeanServer like
rmic CallBeanServer
when I run this program using
java CallBeanServer false
it gives the follwoing errors
Connected to existing registry
Exception in thread "main" java.rmi.ServerException: Server RemoteException; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: CallBeanServer_Stub
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: CallBeanServer_Stub
java.lang.ClassNotFoundException: CallBeanServer_Stub
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(Unknown Source)
at sun.rmi.transport.StreamRemoteCall.executeCall(Unknown Source)
at sun.rmi.server.UnicastRef.invoke(Unknown Source)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at CallBeanServer.<init>(CallBeanServer.java:38)
at CallBeanServer.main(CallBeanServer.java:30)
Can you please tell me what is the error?
Thanks
Prashant Gupta

Add the classes (the stubs included) to the classpath when you start the registry.

Crazy Exception blocked my RMI server

Hi all one crazy exception is thrown when I try to start the server. Plz reply me the the possible cause and solution.
thanks in advance
The exception is :
Error starting service
java.rmi.server.ExportException: Listen failed on port: 0; nested exception is:
java.net.SocketException: JVM_Bind (code=10055)

You cant listen / bind on port 0. Try a different port number greater than 1024. That should work out.

Load balancing on RMI Server Application

Hi there, I'd like to know more detail about load balancing on RMI server application, been digging the web for some time, but couldn't find much information, does anyone know any website or has the knowledge of load balancing on RMI to share? Sort like its design and implementation.
Thanks,
Jax

I want performance and fault-tolerance,
In that case, is it necessary to have a main
rmi server to allow client to access and pick one of
the rmi servers for the client?Well, if you have one main RMI server, you have a single point of failure again.. Why can't your application know about all rmi servers, and randomly choose one? If it's down, pick a different one.. If your applicatoin is an applet, you'll have to sign it.. Do that and put it on 2 redundant web servers. You have performance by splitting the load and you have your fault tolerance by having x identical rmi servers.
If you're saying what I think, why would you have one main rmi server that picks a different rmi server? That's more work AND your redundancy goes byebye, ie if your main rmi server dies..

How to get the IP address of RMI server???

Hi:
Is there a way to know the IP address of RMI server before client and server connect?
I am assuming that client didn't know the IP address of the server.
Because I know that client must hold a server reference so that client can connect to server.
But I want my client program to find out server IP address before they connect and use this finding to connect to server.
Is it possible?
Thanks!

So you KNOW that the client MUST know where the server is yet you want the client to find out where the server is?
Simple answer: forget it.
If you don't know where to connect to how are you ever going to connect to it?
And if you do know you don't have to go looking it up...
You can probably do something with JNDI, but then you're only putting off the inevitable as now you need to both know how to contact the JNDI server AND the JNDI server needs to know where the the RMI registry for the service you want to connect to is.

How do I make a RMI client running in Bea find a remote, non Bea, RMI server?

On my stand alone test system I run a RMI server in one JVM,
registry.exe and a RMI client in its own JVM. The client uses
java.rmi.Naming.lookup() to find the RMI server, and this works fine.
If I run the same RMI client class within Bea the naming lookup fails! I
guess this is due to Bea using it own RMI registry rather than the
registry.exe I started separately(?)
QUESTION: How do I make a RMI client running in Bea find a remote,
non-Bea, RMI server?
Of course, in the final environment the server will run on a system
remote from Bea.
The RMI client calls are done from a servlet, not from a EJB.
The doumentation about using RMI with Bea is focused on running the RMI
server within Bea. This might be the "normal" thing to do, but in our
case Bea is the client, not the server. Do I still need to use
weblogic.rmi.*....? If so, where?
Grateful for any tip.
Göran Hagnell

On my stand alone test system I run a RMI server in one JVM,
registry.exe and a RMI client in its own JVM. The client uses
java.rmi.Naming.lookup() to find the RMI server, and this works fine.
If I run the same RMI client class within Bea the naming lookup fails! I
guess this is due to Bea using it own RMI registry rather than the
registry.exe I started separately(?)
QUESTION: How do I make a RMI client running in Bea find a remote,
non-Bea, RMI server?
Of course, in the final environment the server will run on a system
remote from Bea.
The RMI client calls are done from a servlet, not from a EJB.
The doumentation about using RMI with Bea is focused on running the RMI
server within Bea. This might be the "normal" thing to do, but in our
case Bea is the client, not the server. Do I still need to use
weblogic.rmi.*....? If so, where?
Grateful for any tip.
Göran Hagnell

Cant create JDBC Connections in RMI Server

I am having a pretty weird problem which I am struggling with for the last three days. In the main method of the Server object, following three things are supposed to happen:
1) Creation of a JDBC Connection
2) Creation of a Remote Object and then publishing the same to Registry.
3) Creation of another JDBC Connection (exactly same as in step1)
step 1 and 2 successfully executes and the third one always errors out. I just simply get a NullPointerException.
If I comment out step 2, step 3 executes successfully. Can someone please tell me the mystery? I need your response really urgently so please help me.
TIA
Code Snippet:
public static void main(String[] args) {
  System.setSecurityManager(new RMISecurityManager());
  try {
   Properties dbProps = new Properties();
   dbProps.put("user", "SDAWOODI");
   dbProps.put("password", "SDAWOODI");
   java.sql.Connection connection =    java.sql.DriverManager.getConnection("jdbc:oracle:thin:@wonder.cisco.com:1521:ODSDEV", dbProps);
  catch (Exception sqle) {
   System.out.println("[11111]"+sqle.toString());
  Properties props = new Properties();
  props.put("java.rmi.server.codebase", rmiCodeBase);
  System.setProperties(props);
  try {
   SchedulerRImpl schedulerR = new SchedulerRImpl(ssce_sch1);
   String nameStr = "s-sce-scheduler";
   try {
    Naming.bind(nameStr, schedulerR);
    if (Scheduler.m_debug_flag) System.out.println("[Scheduler.main] Scheduler bound with RMI registry!!!");
   catch (AlreadyBoundException abe) {
    if (Scheduler.m_debug_flag) System.out.println("[Scheduler.main] Scheduler is already bound with RMI registry ... trying RE-bind ...");
    try {
     Naming.rebind(nameStr, schedulerR);
     if (Scheduler.m_debug_flag) System.out.println("[Scheduler.main] Scheduler RE-bound with RMI registry!!!");
    catch (Exception e) {
     if (Scheduler.m_debug_flag) System.out.println("[Scheduler.main] Rcheduler RE-binding failed :(((");
  catch (Exception e) {
   if (Scheduler.m_debug_flag) System.out.println("[Scheduler.main] SchedulerR instantiation failed:((( : "+e.toString());
  Properties dbProps2 = new Properties();
  dbProps2.put("user", "SDAWOODI");
  dbProps2.put("password", "SDAWOODI");
  try {
   java.sql.Connection connection2 = java.sql.DriverManager.getConnection("jdbc:oracle:thin:@wonder.cisco.com:1521:ODSDEV", dbProps2);
   if (connection2==null) {
   System.out.println("connection is NULL");
  else {
   System.out.println("connection is NOT null");
catch (Exception sqle2) {
  System.out.println("[22222]"+sqle2.toString());
}

In reply to reply #4:
You can also quote the other part of my reply when it comes to snippets. There are so many pieces of code missing from your snippet that I simply cannot guess what is wrong. (Please do not put your entire class structures here.)
We get connections in many different classes at many different times. It is after all an application that does user work and the user work involves database accesses. Some of those accesses are before RMI (to establish repositories, etc). Most are after.
This URL (jdbc:oracle:thin:@wonder.cisco.com:1521:ODSDEV) appears to use a network connection (yes?). Is the 1521 a port? Are you trying to reuse this port? (the first conn uses the same URL). What port does RMI use?
There is nothing in your snippet that stands out obviously as "this is wrong".
RMI uses networking. JDBC uses networking.
Try substituting some other networking code in place of the RMI code and see if you still get a null trying the second connection. As you say, if you leave out the RMI code the second get.conn works.
Try leaving out the first get.conn. Do the RMI and second get.conn.
Try this and try that and try some more. I once had this problem with a network printer that would not print. The code was fine. The URL was fine. The response from the network and printer were both fine. The damn thing just wasn't printing. Turns out there was this bit, yes a single bit, in one word of a property called the "start print bit". If this bit wasn't on, nothing happened. I tried every combination until I finally found it.
I wish you the best.

RMI Server Offline Problem

Hello all, I am e newbie in the world of RMI programming. I have developed an application that can control two devices over the internet. The code files are given below :
Parallel.java
import java.rmi.*;
public interface Parallel extends Remote
     void relayDriver(byte k) throws RemoteException;
     byte currentStatus() throws RemoteException;
ParallelImpl.java
import parport.ParallelPort;
import java.rmi.*;
import java.rmi.server.*;
public class ParallelImpl extends UnicastRemoteObject implements Parallel
     private Byte ctrlValue;
     ParallelPort lpt1 = new ParallelPort(0x378); // 0x378 is normally the base address for the LPT1 port
     public ParallelImpl(byte a) throws RemoteException
          ctrlValue = a;
          lpt1.write(ctrlValue);
          System.out.println("Device Actuation Code "+ctrlValue);
     public void relayDriver(byte k) throws RemoteException
          ctrlValue = k;
          System.out.println("Device Actuation Code "+ctrlValue);
          lpt1.write(ctrlValue);
     public byte currentStatus() throws RemoteException
return ctrlValue;
ParallelClient.Java
import java.io.*;
import java.rmi.*;
import java.rmi.server.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class ParallelClient extends JApplet implements ActionListener
     Byte g;
     String url = "rmi://169.254.196.149/";
     private Container container;
     private javax.swing.JTextArea resultArea;
     public void init()
          container = getContentPane();
          container.setLayout( new BorderLayout() );
          resultArea = new javax.swing.JTextArea();
          JRadioButton buttonZero = new JRadioButton("No Device
On");
     buttonZero.setMnemonic(KeyEvent.VK_A);
     buttonZero.setActionCommand("0");
     buttonZero.setSelected(true);
     JRadioButton buttonOne = new JRadioButton("Device 1 On
Only");
     buttonOne.setMnemonic(KeyEvent.VK_B);
     buttonOne.setActionCommand("1");
     JRadioButton buttonTwo = new JRadioButton("Device 2 On
Only");
     buttonTwo.setMnemonic(KeyEvent.VK_C);
     buttonTwo.setActionCommand("2");
     JRadioButton buttonThree = new JRadioButton("Device 1
and 2 Both On");
     buttonThree.setMnemonic(KeyEvent.VK_D);
     buttonThree.setActionCommand("3");
     //Group the radio buttons.
     ButtonGroup group = new ButtonGroup();
     group.add(buttonZero);
     group.add(buttonOne);
     group.add(buttonTwo);
     group.add(buttonThree);
     //Register a listener for the radio buttons.
     buttonZero.addActionListener(this);
     buttonOne.addActionListener(this);
     buttonTwo.addActionListener(this);
     buttonThree.addActionListener(this);
          JPanel radioPanel = new JPanel(new GridLayout(0, 1));
     radioPanel.add(buttonZero);
     radioPanel.add(buttonOne);
     radioPanel.add(buttonTwo);
     radioPanel.add(buttonThree);
     container.add(radioPanel, BorderLayout.LINE_START);
          container.add(resultArea, BorderLayout.SOUTH);
     public void actionPerformed(ActionEvent e)
          try
               Parallel r1 = (Parallel)Naming.lookup(url +
"inival");
               if(r1.currentStatus()==0)
                         resultArea.setText("Previous
Status: No Devices Online....");
                    else if(r1.currentStatus()==1)
                         resultArea.setText("Previous
Status: Device 1 Online. Device 2 Offline.");
                    else if(r1.currentStatus()==2)
                         resultArea.setText("Previous
Status: Device 2 Online. Device 1 Offline.");
                    else
                         resultArea.setText("Previous
Status: Device 1 & 2 both are Online.");
               g = Byte.parseByte(e.getActionCommand());
               r1.relayDriver(g);
               if(r1.currentStatus()==0)
                         resultArea.setText("Current
Status: No Devices Online....");
                    else if(r1.currentStatus()==1)
                         resultArea.setText("Current
Status: Device 1 Online. Device 2 Offline.");
                    else if(r1.currentStatus()==2)
                         resultArea.setText("Current
Status: Device 2 Online. Device 1 Offline.");
                    else
                         resultArea.setText("Current
Status: Device 1 & 2 both are Online.");
          catch(Exception et)
               resultArea.setText("Server OffLine");
ParallelServer.java
import java.io.*;
import java.rmi.*;
import java.rmi.server.*;
public class ParallelServer
     public static void main(String args[])
          try
               System.out.println("Constructing Server Implementations ....");
               ParallelImpl p1 = new ParallelImpl((byte)0);
               System.out.println("Binding Server Implementation to registry ....");
               Naming.rebind("inival",p1);
               System.out.println("Waiting for invocations from Client ....");
          catch(Exception e)
               System.out.println("Server is Offline or Line has broken. Error : "+ e);
The corresponding stub files, class files have been loaded on the internet. http://rcviproject.110mb.com/
On the server machine the rmi registry is on and the ParallelServer program is also running. But when the applet at the URL is actuated then it shows 'server offline'. Why is this happening? Please help.

That did not print anything. The server when started by the following commands :
start rmiregistry
start java ParallelServer
continues to run at Waiting for invocation from client ...... no error msg is shown.
do i need tomcat on the server machine in addition to this ?

RMI server object lookup in a session bean

Hi all,
I am getting MarshalException when I call java.rmi.Naming.lookup() in a session
bean. Following is the code and exception. Please note that I am using java.rmi
package instead of weblogic.rmi and that both the session bean and RMI server
object (a startup class) is deployed on the same machine.
Thanks for your help in advance.
// a simple, replica-aware session bean method
// some code here
try {
MediatorInterface mediator = (MediatorInterface) java.rmi.Naming.lookup("rmi://localhost:7001/TestMediator);
catch (Exception e) {
// log the exception
The exception:
java.rmi.MarshalException: Error marshaling transport header; nested exception
i
s:
java.io.EOFException
java.io.EOFException
at java.io.DataInputStream.readByte(DataInputStream.java:224)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:206
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.lookup(Unknown Source)
at java.rmi.Naming.lookup(Naming.java:84)
at test.mgmtop.CreateNetworkOpHandler.execute(CreateNetworkOpHandler.jav
a:88)
at test.mgmtop.CreateNetworkOpHandler.perform(CreateNetworkOpHandler.jav
a:28)
at test.ejb.MgmtServiceBean.create(MgmtServiceBean.java:57)
at test.ejb.MgmtServiceSession_idi8yo_EOImpl.create(MgmtServiceSession_i
di8yo_EOImpl.java:46)
at test.ejb.MgmtServiceSession_idi8yo_EOImpl_WLSkel.invoke(Unknown Sourc
e)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:346)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerR
ef.java:114)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:300)
at weblogic.security.service.SecurityServiceManager.runAs(SecurityServic
eManager.java:762)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.jav
a:295)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest
.java:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)

Hi Pyung,
How about trying this instead:
InitialContext ctx = new InitialContext();
MediatorInterface mediator = (MediatorInterface) ctx.lookup("TestMediator");
This assumes your startup class binds the Mediator to the JNDI name "TestMediator".
- Matt
Pyung Yoon wrote:
Hi all,
I am getting MarshalException when I call java.rmi.Naming.lookup() in a session
bean. Following is the code and exception. Please note that I am using java.rmi
package instead of weblogic.rmi and that both the session bean and RMI server
object (a startup class) is deployed on the same machine.
Thanks for your help in advance.
// a simple, replica-aware session bean method
// some code here
try {
MediatorInterface mediator = (MediatorInterface) java.rmi.Naming.lookup("rmi://localhost:7001/TestMediator);
catch (Exception e) {
// log the exception
The exception:
java.rmi.MarshalException: Error marshaling transport header; nested exception
i
s:
java.io.EOFException
java.io.EOFException
at java.io.DataInputStream.readByte(DataInputStream.java:224)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:206
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.lookup(Unknown Source)
at java.rmi.Naming.lookup(Naming.java:84)
at test.mgmtop.CreateNetworkOpHandler.execute(CreateNetworkOpHandler.jav
a:88)
at test.mgmtop.CreateNetworkOpHandler.perform(CreateNetworkOpHandler.jav
a:28)
at test.ejb.MgmtServiceBean.create(MgmtServiceBean.java:57)
at test.ejb.MgmtServiceSession_idi8yo_EOImpl.create(MgmtServiceSession_i
di8yo_EOImpl.java:46)
at test.ejb.MgmtServiceSession_idi8yo_EOImpl_WLSkel.invoke(Unknown Sourc
e)
at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef.java:346)
at weblogic.rmi.cluster.ReplicaAwareServerRef.invoke(ReplicaAwareServerR
ef.java:114)
at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef.java:300)
at weblogic.security.service.SecurityServiceManager.runAs(SecurityServic
eManager.java:762)
at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServerRef.jav
a:295)
at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecuteRequest
java:30)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:152)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:133)

RMI server & JDBC

hello:
I am unable to connect using JDBC in an RMI server. I get ExceptionInInitializerError exception in oracle.jdbc.dbaccess.DBConversion. I have tried this same connection from an application and applet and both work fine.
The problem seems to arise when the RMISecurityManager is set.
Lou

In reply to reply #4:
You can also quote the other part of my reply when it comes to snippets. There are so many pieces of code missing from your snippet that I simply cannot guess what is wrong. (Please do not put your entire class structures here.)
We get connections in many different classes at many different times. It is after all an application that does user work and the user work involves database accesses. Some of those accesses are before RMI (to establish repositories, etc). Most are after.
This URL (jdbc:oracle:thin:@wonder.cisco.com:1521:ODSDEV) appears to use a network connection (yes?). Is the 1521 a port? Are you trying to reuse this port? (the first conn uses the same URL). What port does RMI use?
There is nothing in your snippet that stands out obviously as "this is wrong".
RMI uses networking. JDBC uses networking.
Try substituting some other networking code in place of the RMI code and see if you still get a null trying the second connection. As you say, if you leave out the RMI code the second get.conn works.
Try leaving out the first get.conn. Do the RMI and second get.conn.
Try this and try that and try some more. I once had this problem with a network printer that would not print. The code was fine. The URL was fine. The response from the network and printer were both fine. The damn thing just wasn't printing. Turns out there was this bit, yes a single bit, in one word of a property called the "start print bit". If this bit wasn't on, nothing happened. I tried every combination until I finally found it.
I wish you the best.

Rmi server problem

hi
Can anybody tell me how to stop the Jvm to free the Rmi server port and the remote object?

Hi,
The first step: unbind the bound object from the registry!
As far as I know the UnicastRemoteObject calls the exportObject() method in its constructor. If you want to force the unregistering call the UnicastRemoteObject's unexportObject() method on the server object.
After these two calls (Naming.unbind(), UnicastRemoteObject.unexportObject()) the server object surely is no longer listening the remote calls, the JVM exits smothly...
Sany

RMI server appears to deadlock but is fine after...

I have a RMI server that is providing services to clients on my network.
When I run tests from the clients (an app that constatnly makes demanding method calls to the RMI server) everything runs fine.
I have one Windows 2000 client and one Slackware Linux 10.1 client, everyone has the same version JVM. They both run the "stress test" at the same time. The Server is a Windows XP MCE on a dual core Processor, the OS has been configured to run both processors.
Both clients run for hours (all day) and so does the server without problem. Except sometimes I come back and it looks as though my clients are expererinceing some type of deadlock and when I check the server it is sitting there not doing anything as if everything is deadlocked.
Now the magic, at the server console I smack a few keys on the keyborad and everything jumps back into business humming along just fine.
What the heck? I have had this happen more than once. My apps have no input facilities whatsoever except CTRL+C which I use to kill them when I'm done with my "stress test".
I have noticed Windows clients can kinda drag everyone else down because of the way it schedules threads.
Any ideas?
Sean

Sometimes thread prioroties can be used effectivly on
Windows if you are having problems with your WINDOWS
machines handling the threads "properly". But not
much use really.
For testing? OK.
I have been developing and testing parallel threaded
applcations and it would not be possible without a
dual-processor machine (properly configured).
Number of processors is irrelevant. Why do you think this makes any difference at all?
You cannot test threaded applications on a single
processor. Single processor runs ONE thread at a
time. Dual-Core or dual processors can run THREADS
in parallel. I've seen it work, beautifully. your
threaded app may run fine on one processor BUT if you
run it on a dual machine it may break. In computer
science parallel computing has been around for a long
time but the majority of people (programmers) have no
idea about it whatsoever and there is a lot of
misconceptions.
I happen to have a Masters in distributed computing. I quite enjoy it. And I still insist that a dual core system is not going to do anything to your threads that a single core system won't do to your threads.
I challenge you to write a program that can tell the number of processors present, without checking the system property. If the OS is properly written and the chipset is working as it should, your program can not tell.
One thing I see repeated is that dual-core machines
have liitle impact on performance because most
applications have only a single thread. Horse
feathers!!! Windows and any other OS is going to run
applications in parallel!! I have noticed a nice
improvemnet in basic operations on a dual-core
(properly configured).
applications don't run in parallel, threads do. adding a 2nd core may make your computer more responsive if the OS preemptive scheduler is poorly written. Otherwise its no different than adding a faster CPU.
This is a wonderful subject (Parallel Computing, the
new PC)and I'm hooked (bad) mainly because this area
is almost unexplored by the masses and there is a lot
of work (read innovation) that needs done in the next
decade on the software end. If you like serious PC
check out Solaris (awsome).I love it. I was working on parallel code in Linux several years back while in school. Its not unexplored really. Search for distributed computing and you will find lots of info. The thing that is new is the attempt to take advantage automagically of multi cpu by programs that were not written to take advantage.
>
P.S. My dual-core 1gig SATA (XPS) Dell machine just
caught up with my PIII single CPU 512mb SCSI U-160
(500sc)machine in total throughput. seat-of-pants
All this swapping has to go.
Sean
Message was edited by:
DataVirtueMy last dual cpu machine was a abit BP6 dual celeron. Its a nice novelty, but buying dual/cpu dual core makes no sense unless the fastest single CPU is not fast enough or the price is right. Dual-cores has come about because the CPU folks are having difficulty making the single CPUs faster. Its a cop-out really. Instead of advancing technology, they add a 2nd CPU and try to act like they did something.
Anyone that chooses a dual-core CPU over a twice as fast single core CPU either does not understand distributed computing, or enjoys the novelty.

RMI server fails on a few PCs, works on others

I have a small RMI server, started on various PC, to which a UNIX server connects to send them messages.
On each PC I have :
- An RMI registry.
- A Java RMI server, ready to receive messages from the UNIX machine.
All the PC are running Win NT 4 SP6, and the JRE 1.3.1.
On some PC, when the RMI server receives a RMI call from the UNIX machine, I get this error on the UNIX side :
java.rmi.UnmarshalException: Error unmarshaling return; nested exception is:
java.io.InvalidClassException: pop2PcServer_Stub; Local class not compat
ible: stream classdesc serialVersionUID=2 local class serialVersionUID=385818717
3882730883
at sun.rmi.registry.RegistryImpl_Stub.lookup(RegistryImpl_Stub.java:107)
at java.rmi.Naming.lookup(Naming.java:60)
at pop2Pc.main(pop2Pc.java:41)
It happens every time when these specific PCs are involved.
I tried everything : the programs don't use a security manager, the PC part starts the registry itself (instead of relying on a separate rmiregistry process). Whatever I do. I can't make the RMI process work correctly on these PC.
I really don'ty understand, because my program is identical in every case.

Unfortunately, this is already the case. The classe have been all compiled on the Unix server, and every time they are all bundled in a jar file which is on every PC the same.
On all the PC I also bundle the JRE 1.3.1 in a subdirectory of my program. With the PATH and CLASSPATH variables I directly point to it, as well as to the jar file.

RMI Server

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