Is it a must to set java.rmi.server.codebase property?

As to my understanding, only when JVM cannot find the necessary class from the local CLASSPATH will it tries to download the classes from the codebase right? so if the class exists in the local machine, actually it is unnecessary to set this property? Urgent, help!!!!!

Correct.

Similar Messages

Java.rmi.server.codebase in JSP

Hi,
i have a system made from an RMI client and an RMI server. The users access the system through a JSP page, which creates an instance of the RMI client. In order for the system to work, i need to specify the java.rmi.server.codebase property.
For testing purposes the client has a main(..) method. If i run just the client the server and specify java.rmi.server.codebase, everything works.
If i don't specify it i get a java.rmi.UnmarshalException, with the nested exception of ClassNotFound. The same exception i get trying to access the jsp page. So, i guess, it's due to the lack of the property.
I tried setting the property in the jsp page, but it doesn't work.
Thank you.
P.S. : maybe this is relevant: my jsp server is tomcat 6.0.

it refers to where are your stubs and skeletons
you can set it to point to the jar files or to the directory that contains them
hope htis helps
regards
marco

Reading java.rmi.server.hostname property

When try to read java.rmi.server.hostname property within my server I got following exception:
Exception in thread "main" java.security.AccessControlException: access denied (
java.util.PropertyPermission java.rmi.server.hostname read)
at java.security.AccessControlContext.checkPermission(Unknown Source)
at java.security.AccessController.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPermission(Unknown Source)
at java.lang.SecurityManager.checkPropertyAccess(Unknown Source)
at java.lang.System.getProperty(Unknown Source)
at engine.ComputeEngine.main(ComputeEngine.java:22)
Any idea how to read this property from program.
Syed

Looks as if you need to create a security manager or add a security policy file.
To create a security manager, add:
if (System.getSecurityManager() == null) {
System.setSecurityManager(new RMISecurityManager());
to the server's 'main' method.
Then, at program startup, pass in a security policy file:
java ... -Djava.security.policy=[<pathname>]security.policy [<classpath>]/<RMI server name>
Where the file security.policy might contain:
grant {
// Allow everything for now
permission java.security.AllPermission;
Amoong other privileges.

Java.rmi.server.codebase=file:(?????); at client side: classnotfounexceptio

I'm trying to run an RMI application (under Windows XP, one machine for client and server) like this:
at server side:
java -Djava.rmi.server.codebase=file://\..\..\..\j\ -Djava.security.policy=file:.\polityka.txt sss
- and it works fine, but at client side:
java -Djava.security.policy=file:.\polityka.txt -Djava.rmi.server.codebase=file://\..\..\..\j\ kkk
results in:
Exception in thread "main" java.lang.NoClassDefFoundError: PrzykladowaKlasa
at kkk.main(kkk.java:31)
when I'm listing directory (at client side) got with System.getProperty("java.rmi.server.codebase") i get this
file://\..\..\..\j\
OdleglaKlasa_Stub.class
PrzykladowaKlasa.class
Folder Structure is:
|------j\
| |------(*_Stub.class, and ClassNeededByClient.class)
|------2\
| |------Server\
| | |------(serwer files)
| |------Klient\
| | |------(klient files)
I'm fresh in RMI and Codebase poperty, but with some exp with Java...
(policy files are allright - grant {permission java.security.AllPermission;};)
Any help will be appreciated.

I've come back to this issue again (since I am moving code around to different systems again). Using linux I can use -Djava.rmi.server.codebase=file://$PWD/build/
Presumably there is a similar command in WIndows.

Rmi.server.codebase property

Hi i am new ,
I've writting a small RMI-application using Apache webserver lo load classes,that will be needed by client.
the question:I will instead of webserver(http or ftp) a file protocol and as codebase a networkdrive,that be of course from client accessible
what muss exactly written in the property?
thanks!

file://myserver/mydirectory/myjarfile.jar. If there are any spaces they must be URL-encoded as %20. See java.net.URLEncoder.

Rmiregistry �J-Djava.rmi.server.codebase=URL

Hi all,
When starting the rmiregistry, I do the following:
rmiregistry �J-Djava.rmi.server.codebase=URL
Eager to understand what is going on, I read that this means the following:
RMIClassLoader:
For stubs and skeletons of remote objects created in the local virtual machine, the URL specified by the local java.rmi.server.codebase property is used.
I thought "hey why not do the same for the server" and tried:
java -Djava.rmi.server.codebase=URL Server
getting me a StubNotFoundException. Can anybody tell me what I am doing wrong? The Server works when the Stub is in the local classpath but refuses to load it via the http Server. Am I at least theoretically right or is there a fundamental misconception in what I am trying?
Thanks,
Ralf

RMI uses annotations to record codebase information. In addition to recording the class despriptions also records info about the location from which it loaded the classes bytecode. If you are trying to specify the codebase on the server and removing the stubs from the servers classpath the bytecode will never actually get loaded.

UnmarshalException while using prop java.rmi.server.ignoreStubClasses=true

I have created a test program to check the behaviour of setting the java.rmi.server.ignoreStubClasses property to true on the server side and not setting this flag on the client side.
This requirement is due to updation of an already running system, with stubs to a new version without stubs, without shutting down the system.
The files used by me are given below.
File Hello.java
package example.hello;
import java.rmi.Remote;
import java.rmi.RemoteException;
public interface Hello extends Remote {
String sayHello() throws RemoteException;
File Server.java
package example.hello;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
import java.rmi.server.UnicastRemoteObject;
public class Server implements Hello {
public Server() {}
public String sayHello() {
return "Hello, world!";
public static void main(String args[]) {
try {
LocateRegistry.createRegistry(1099);
Server obj = new Server();
Hello stub = (Hello) UnicastRemoteObject.exportObject(obj, 0);
// Bind the remote object's stub in the registry
Registry registry = LocateRegistry.getRegistry();
registry.bind("Hello", stub);
System.err.println("Server ready");
catch (Exception e)
System.err.println("Server exception: " + e.toString());
e.printStackTrace();
File Client.java
package example.hello;
import java.rmi.registry.LocateRegistry;
import java.rmi.registry.Registry;
public class Client {
private Client() {}
public static void main(String[] args) {
String host = (args.length < 1) ? null : args[0];
try {
Registry registry = LocateRegistry.getRegistry(host);
Hello stub = (Hello) registry.lookup("Hello");
String response = stub.sayHello();
System.out.println("response: " + response);
} catch (Exception e) {
System.err.println("Client exception: " + e.toString());
e.printStackTrace();
First I run file Server.java using the following script (server.bat)
java -Djava.rmi.server.ignoreStubClasses=true -classpath .; example.hello.Server
pause
Then the client is run using the following script (client.bat)
java -classpath .; example.hello.Client 132.186.96.210
pause
While running the client, the following exception is obtained.
Client exception: java.rmi.ServerException: RemoteException occurred in server thread; nested except
java.rmi.UnmarshalException: error unmarshalling call header; nested exception is:
java.rmi.UnmarshalException: skeleton class not found but required for client version
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling call header; nested exception is:
java.rmi.UnmarshalException: skeleton class not found but required for client version
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:325)
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 sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at example.hello.Client.main(Client.java:52)
Caused by: java.rmi.UnmarshalException: error unmarshalling call header; nested exception is:
java.rmi.UnmarshalException: skeleton class not found but required for client version
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:250)
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)
Caused by: java.rmi.UnmarshalException: skeleton class not found but required for client version
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:243)
... 6 more
I am not able to figure out why this thing is happening, If i also set the property java.rmi.server.ignoreStubClasses=true on the client side everything goes fine. But this I can't do. I can't set the property on the client side as the system is up and already running.
I am using JDK version 1.5.0_06. Same exception comes under JDK 6.0
Any help will be highly appreciated.

I think this is a bug. When you exported the Registry from your server JVM it was also exported with java.rmi.server.ignoreStubClasses=true, but the Registry bootstrap at the client requires the 1.1 stub protocol for compatiblity reasons so you got this error. I would report this on the Bug Parade.
You could get around it by setting java.rmi.server.ignoreStubClasses after exporting the Registry.
BTW java.rmi.server.ignoreStubClasses isn't supposed to do anything at the client whether true or false so you can cut your testing space in half.

Spaces in -Djava.rmi.server.codebase path

hello,
how must i format the string containing the codebase for a rmi server if the path to the codebase contains spaces?
-Djava.rmi.server.codebase=file:c:/path/ and -Djava.rmi.server.codebase=file:/path/ works, but
-Djava.rmi.server.codebase=file:c:/path with spaces/ doesnt work
i have tried to put the string in quotes and to replace the spaces with %20 (url encoded)
but nothing does work.
how must i format the string?
cu,
elmar

I guess you are using a batch file to start your RMI application.
Spaces in URLs must be encoded with %20, that is correct.
The problem is: the command line interpreter on Windows interprets % as a special character and will replace it.
What worked for me (Windows Vista):
java -Djava.rmi.server.codebase="file:/C:/Users/FirstName%%20LastName/RMI/" App
So encode each white space with %%20.
You can very easily check by inserting the following code at the start of your RMI application. These lets you see how the codebase is set.
System.out.println(" Codebase: " + System.getProperty("java.rmi.server.codebase"));

Dynamically changing java.rmi.server.hostname

Hi all,
I am trying to change the java.rmi.server.hostname value dynamically to force my rmi stubs to be exposed on a particular ip
The java app is started with a default value of 172.30.30.200 for the java.rmi.server.hostname attribute using the -D parameter. Before the binding is done, I set the value of the java.rmi.server.hostname in the system properties to localhost and then call the rebind (code snippet below).
After this, if I use a jndi browser, I do not see the entries for the localhost. However, I see the entries for 172.30.30.200.
The release notes for 1.4.2 and 1.5.0 indicate that this attribute can be changed dynamically; does not say how though.
http://java.sun.com/j2se/1.4/docs/guide/rmi/relnotes.html
Can anyone give me an idea as to what is happenning.
Thanks a lot for your help
Properties currentProperties = System.
String ipAddr = "localhost";
currentProperties.put("java.rmi.server.hostname", ipAddr);
System.setProperties(currentProperties);
UnicastRemoteObject.exportObject(this);
InitialContext ctx=new InitialContext();
ctx.rebind(getObjectName().toString(), this);

java.rmi.server.hostname should be set to whatever hostname or IP address the client should use when trying to connect to the server. It only needs to be set in JVMs which export remote objects, i.e. in server JVMs.

How to interpret rmi log msgs when setting -Djava.rmi.server.logCalls=true

i have set this property: -Djava.rmi.server.logCalls=true
now i am getting the following rmi log msgs on the console:
Tue Nov 12 15:38:08 PST 2002:RMI:RMI TCP Connection(4851)-172.16.103.94:[172.16.103.94: sun.rmi.transport.DGCImpl[0:0:0, 2]: java.rmi.dgc.Lease dirty(java.rmi.server.ObjID[], long, java.rmi.dgc.Lease)]
Tue Nov 12 15:38:13 PST 2002:RMI:RMI TCP Connection(4852)-127.0.0.1:[127.0.0.1: sun.rmi.registry.RegistryImpl[0:0:0, 0]: java.rmi.Remote lookup(java.lang.String)]
Tue Nov 12 15:38:20 PST 2002:RMI:RMI TCP Connection(4853)-172.16.103.94:[172.16.103.94: sun.rmi.transport.DGCImpl[0:0:0, 2]: void clean(java.rmi.server.ObjID[], long,java.rmi.dgc.VMID, boolean)]
can some one pls tell me know to interpret the messages, what does the number 4853 in TCP Connection(4853) mean ? thanks a lot

Basically it is:
date:subsystem:threadid:[remote object[object-id]:method]The 4853 is part of the thread-id and it is something like an instance number of the thread class.
EJP

Java.rmi.server.SkeletonMismatchException: interface hash mismatch

I am trying to get a MBORemoteSet from the session, which actually gives me the list from the database table. when i click on a combo box returning me the list using the MBOSetRemote object it throws me the exception.
could not load the labor codes from Maximo
java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
     java.rmi.server.SkeletonMismatchException: interface hash mismatch
java.rmi.server.SkeletonMismatchException: interface hash mismatch
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:240)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:215)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:349)
at worktech.app.labor.WTLaborSet_Stub.setWhere(Unknown Source)

Well this error occurs if the RMI files are different on the server and client side.
It basically tells you that the stub and skeleton don't match with each other. Get the latest version of the RMI jar file or whatever file you are using on the server side to replace the file you are using oon the client side. This would make stub and skeletons to communicate with each other effectively . enjoy :)

How to Start Java RMI Server Application as Windows NT Service

Hi!!,
I have problem regarding the Installation of Java Application as NT Service this Java app in turn will start RMI Registry using LocateRegistry.createRegistry() at some specific port number. The Service is created successfully but i have problem regarding the Accessing of this Remote Object using Lookup() .(ie) I am able to get the RMI Registry Obj Refererce of the Java Rmi Application but couldn't able to Lookup for the Object registered to this Rmi Registry.I am not able to proceed after getting the Rmi Registry reference.
So any help Regarding this is appreciated.
Thanks in Advance.
with regards,
Ramakrishna M
Mail: [email protected]

Hello,
I have started a Java RMI Server Application as NT Service using JNT (download it from www.eworksmart.com/JNT/ ).
It is working fine.
S. Navaneethakrishnan
[email protected]

Java.rmi.server.ExportException: while stopping weblogic Managed server

Hello,
I am getting the below error while I try to stop the weblogic managed server from the stop script in the server. I am able to do it thru the console.
the weblogic version is 9.23.
-server -Xms1536m -Xmx1536m
Stopping Weblogic Server...
Error: Exception thrown by the agent : java.rmi.server.ExportException: Port already in use: 9990; nested exception is:
java.net.BindException: Address already in use
I am a newbie , so anyone could help me figure out the things I need to check so that I can troubleshoot the issue?
thanks in advance.

Are you using a custom script or <domain>/bin/stopManagedWebLogic.sh ?
The msg you've informed seems to be an error that happens when you try to start a managed server that is trying to use a port that is already in use.

Java.rmi.server.ExportException: Listen failed on port: 1099;

Hi All,
I am trying to run RMI tutorial from sun's java tutorial. It has 8 parts. The last two parts are "Compiling the Example Programs" and "Running the Example Programs".
Until "Compiling the Example Programs", I am okay.
But I am stuck in the last part, "Running the Example Programs". When I use the command "rmiregistry", it gives me a list of exceptions as follows.
c:\home\ann\src>rmiregistry
java.rmi.server.ExportException: Listen failed on port: 1099; nested exception is:
java.net.SocketException: Permission denied: listen failed
at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:312)
at sun.rmi.transport.tcp.TCPTransport.exportObject(TCPTransport.java:218)
at sun.rmi.transport.tcp.TCPEndpoint.exportObject(TCPEndpoint.java:393)
at sun.rmi.transport.LiveRef.exportObject(LiveRef.java:129)
at sun.rmi.server.UnicastServerRef.exportObject(UnicastServerRef.java:190)
at sun.rmi.registry.RegistryImpl.setup(RegistryImpl.java:92)
at sun.rmi.registry.RegistryImpl.<init>(RegistryImpl.java:78)
at sun.rmi.registry.RegistryImpl.main(RegistryImpl.java:322)
Caused by: java.net.SocketException: Permission denied: listen failed
at java.net.PlainSocketImpl.socketListen(Native Method)
at java.net.PlainSocketImpl.listen(PlainSocketImpl.java:380)
at java.net.ServerSocket.bind(ServerSocket.java:320)
at java.net.ServerSocket.<init>(ServerSocket.java:185)
at java.net.ServerSocket.<init>(ServerSocket.java:97)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createServerSocket(RMIDirectSocketFactory.java:27)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createServerSocket(RMIMasterSocketFactory.java:333)
at sun.rmi.transport.tcp.TCPEndpoint.newServerSocket(TCPEndpoint.java:649)
at sun.rmi.transport.tcp.TCPTransport.listen(TCPTransport.java:299)
... 7 more
c:\home\ann\src>
Then, I try to use "start rmiregistry" command. At that time, a command window stating the above exception popup just for a while and closed automatically.
Now, I use jdk1.6.0_16 on Windows Vista.
Previously, I used j2sdk1.4.2_19. That time, I could run "start rmiregistry" properly and could try testing another RMI example application.
But if I use j2sdk1.4.2_19, compiling some statements in the sun's RMI tutorial gives me error. So, I change to use jdk1.6.0_16 for this tutorial. "jdk1.6.0_16" compiles all programs in the tutorial with no error. But I can't run the statement "start rmiregistry".
I use the command prompt from Vista's default Administrator account and already disable User Account Control too.
Any help, please!
Thanks a lot,
atzm111

Hi,
This is the result of netstat -an
c:\home\ann\src>netstat -an
Active Connections
Proto Local Address Foreign Address State
TCP 0.0.0.0:135 0.0.0.0:0 LISTENING
TCP 0.0.0.0:2868 0.0.0.0:0 LISTENING
TCP 0.0.0.0:3999 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49152 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49153 0.0.0.0:0 LISTENING
TCP 0.0.0.0:49154 0.0.0.0:0 LISTENING
TCP 192.168.1.102:139 0.0.0.0:0 LISTENING
TCP 192.168.1.102:49475 64.233.189.17:80 ESTABLISHED
TCP 192.168.1.102:49620 64.233.189.83:80 ESTABLISHED
TCP 192.168.1.102:49625 72.5.124.102:80 ESTABLISHED
TCP 192.168.1.102:49626 72.5.124.102:80 ESTABLISHED
TCP 192.168.1.102:49627 72.5.124.102:80 ESTABLISHED
TCP 192.168.1.102:49628 72.5.124.102:80 ESTABLISHED
TCP 192.168.1.102:49629 72.5.124.102:80 ESTABLISHED
TCP 192.168.1.102:49631 72.5.124.61:80 TIME_WAIT
TCP 192.168.1.102:49634 124.155.222.16:80 ESTABLISHED
TCP [::]:135 [::]:0 LISTENING
TCP [::]:49152 [::]:0 LISTENING
TCP [::]:49153 [::]:0 LISTENING
TCP [::]:49154 [::]:0 LISTENING
UDP 0.0.0.0:123 *:*
UDP 0.0.0.0:500 *:*
UDP 0.0.0.0:4500 *:*
UDP 0.0.0.0:5355 *:*
UDP 127.0.0.1:1900 *:*
UDP 127.0.0.1:51196 *:*
UDP 127.0.0.1:64757 *:*
UDP 192.168.1.102:137 *:*
UDP 192.168.1.102:138 *:*
UDP 192.168.1.102:1900 *:*
UDP 192.168.1.102:51195 *:*
UDP [::]:123 *:*
UDP [::]:500 *:*
UDP [::]:5355 *:*
UDP [::1]:1900 *:*
UDP [::1]:51193 *:*
UDP [fe80::100:7f:fffe%16]:1900 *:*
UDP [fe80::100:7f:fffe%16]:51194 *:*
UDP [fe80::18c1:1fa4:382b:261%12]:1900 *:*
UDP [fe80::18c1:1fa4:382b:261%12]:51191 *:*
UDP [fe80::69bc:321e:5e99:dc7c%11]:1900 *:*
UDP [fe80::69bc:321e:5e99:dc7c%11]:51192 *:*
UDP [fe80::a0a0:89c2:b2fd:e4b9%13]:1900 *:*
UDP [fe80::a0a0:89c2:b2fd:e4b9%13]:51190 *:*
c:\home\ann\src>
So, port 1099 is not in use. I don't know how to check your second fact. I'll find it out coz I can't ask you. :D
Thanks!

About java.rmi.server.UnicastRemoteObject

Hi friends
Just now I started studying about RMI. In Implementing Remote Interface class we extends java.rmi.server.UnicastRemoteObject class we also have java.server.RemoteObject also why we specifically extends UnicastRemoteObject what is the significance of it
can anyone help me plz
thank u

UnicastRemoteObject is a base class that can make your object a remote object. (If you create an object that DOESN'T extend UnicastRemoteObject, then it's methods cannot be accessed remotely.

Is it a must to set java.rmi.server.codebase property?

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