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.

Similar Messages

Java -Djava.rmi.server.codebase=file:///.....

Cross posted in the hope that someone using it knows how....
I am using the following command:
java -Djava.rmi.server.codebase=file:///home/ben/fyp/build/ -Djava.security.policy=security.policy -cp ./lib/bcprov-jdk15-130.jar:./props:./build com.bensmyth.fyp.example.IssuerServer
Can I specify -Djava.rmi.server.codebase=file:///home/ben/fyp/build/ without giving the whole path? Can I say ./build?

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.

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

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.

RMI Server Codebase Permission Denied

I'm having a problem trying to get my application running in a test environment. I currently have this same application up and running in an almost identical location without any issues, and I'm at a loss to understand what the problem is.
My application is an RMI server-client setup. At the moment, I'm having trouble with solely the server portion, as I'm unable to get it to access the codebase. I start the application with the following runServer.sh file (located in /usr/local/app/app, so the $ROOT_DIR=pwd is correct):
Line: -----
#!/bin/bash
ROOT_DIR=`pwd`
JAVA_HOME=/usr/java/latest
CLASSPATH=''
#:: Please edit the environmental variables below so that it refers
#:: to the location where you have distribution URL.
DISTRIBUTION_URL=file://$ROOT_DIR
find /usr/local/app/app/server -name '*.jar' -type f -print | while read FILE
do
if [ $CLASSPATH ]
then
     CLASSPATH=$CLASSPATH:$FILE
else
     CLASSPATH=$FILE
fi
echo $CLASSPATH > classpath.env
done
read CLASSPATH < classpath.env
find /usr/local/app/app/import -name '*.jar' -type f -print | while read FILE
do
if [ $CLASSPATH ]
then
     CLASSPATH=$CLASSPATH:$FILE
else
     CLASSPATH=$FILE
fi
echo $CLASSPATH > classpath.env
done
read CLASSPATH < classpath.env
find /usr/local/app/app/common -name '*.jar' -type f -print | while read FILE
do
if [ $CLASSPATH ]
then
     CLASSPATH=$CLASSPATH:$FILE
else
     CLASSPATH=$FILE
fi
echo $CLASSPATH > classpath.env
done
read CLASSPATH < classpath.env
echo ${CLASSPATH}
cd server
# start /min "RMI Registry"
$JAVA_HOME/bin/rmiregistry &
JAVA_SECURITY="-Djava.security.policy==config/admin.policy -Djava.security.auth.login.config==config/app_jaas.config"
IMPORT_PROPERTIES="-Dapp.import.properties=file://$ROOT_DIR/import/config/import.properties -Dapp.import.logging.properties=file://$ROOT_DIR/import/config/importlog.properties -Dapp.client.properties=file://$ROOT_DIR/client/config/client.properties"
app_PROPERTIES="-Dapp.root=$ROOT_DIR -Dconnection.pool.properties=file://$ROOT_DIR/server/config/database.properties -Dapp.common.properties=$DISTRIBUTION_URL/common/config/common.properties -Dapp.server.properties=file://$ROOT_DIR/server/config/server.properties -Dapp.server.logging.properties=file://$ROOT_DIR/server/config/log.properties"
echo
echo "-------------- app Server -------------------"
echo
$JAVA_HOME/bin/java -ms96m -mx256m -classpath $CLASSPATH -Djava.rmi.server.codebase=file:///usr/local/app/app/common/lib/common.jar $IMPORT_PROPERTIES $JAVA_SECURITY $app_PROPERTIES -Xdebug -Xnoagent -Xrunjdwp:transport=dt_socket,server=y,address=8000,suspend=n app.serverimpl.ServerStarter
cd $ROOT_DIR
Line: -----
After running this, it fails at that last line, $JAVA_HOME/bin/java etc. Near as I can see from the error is that it cannot access the -Djava.rmi.server.codebase.
Line: -----
app.serverimpl.service.ServiceException:java.rmi.ServerException: RemoteException occurred in server thread; nested exception is:
java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: access to class loader denied
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:419)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:267)
at sun.rmi.transport.Transport$1.run(Transport.java:177)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
at sun.rmi.transport.StreamRemoteCall.exceptionReceivedFromServer(StreamRemoteCall.java:273)
at sun.rmi.transport.StreamRemoteCall.executeCall(StreamRemoteCall.java:251)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:377)
at sun.rmi.registry.RegistryImpl_Stub.bind(Unknown Source)
at app.serverimpl.service.LoginManagerServiceImpl.start(LoginManagerServiceImpl.java:52)
at app.serverimpl.service.ServiceAdapter.start(ServiceAdapter.java:96)
at app.serverimpl.service.ServiceManager.startup(ServiceManager.java:78)
at app.serverimpl.ServerStarter.main(ServerStarter.java:62)
Caused by: java.rmi.UnmarshalException: error unmarshalling arguments; nested exception is:
java.lang.ClassNotFoundException: access to class loader denied
at sun.rmi.registry.RegistryImpl_Skel.dispatch(Unknown Source)
at sun.rmi.server.UnicastServerRef.oldDispatch(UnicastServerRef.java:409)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:267)
at sun.rmi.transport.Transport$1.run(Transport.java:177)
at java.security.AccessController.doPrivileged(Native Method)
at sun.rmi.transport.Transport.serviceCall(Transport.java:173)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:553)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:808)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:667)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:636)
Caused by: java.lang.ClassNotFoundException: access to class loader denied
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:445)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:182)
at java.rmi.server.RMIClassLoader$2.loadClass(RMIClassLoader.java:637)
at java.rmi.server.RMIClassLoader.loadClass(RMIClassLoader.java:264)
at sun.rmi.server.MarshalInputStream.resolveClass(MarshalInputStream.java:214)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1592)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1513)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1749)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1346)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:368)
... 12 more
Caused by: java.security.AccessControlException: access denied (java.io.FilePermission /usr/local/app/app/common/lib/- read)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java:393)
at java.security.AccessController.checkPermission(AccessController.java:553)
at java.lang.SecurityManager.checkPermission(SecurityManager.java:549)
at sun.rmi.server.LoaderHandler$Loader.checkPermissions(LoaderHandler.java:1173)
at sun.rmi.server.LoaderHandler$Loader.access$000(LoaderHandler.java:1127)
at sun.rmi.server.LoaderHandler.loadClass(LoaderHandler.java:409)
... 21 more
Line: -----
Out of growing desperation (and since it's a test VM in virtual box so I'm not really protecting anything) I've already granted full permissions to everyone for these these files in the filesystem itself - chmod -R 775 - and I've made sure that common.jar is accessible. I also double-checked the Security Policy, Djava.security.policy, and that's just a straight all permission to everything (again, I'm not protecting anything on this test).
Line: -----
grant {
permission java.security.AllPermission;
Line: -----
What's really driving me nuts is that this exact same code is already running and working on another machine. There are no environment variables that I'm missing, and I don't see how those would relate to this problem even if I did. The directories are identical, and I've verified the location that's listed as the cause (/usr/local/app/app/common/lib/) exists and is accessible. I keep coming back to the file permissions and the security policy and I'm sure I could be missing something obvious, but I am not seeing it at all. Can anyone give me some advice on this?
I'm running a VM in VirtualBox 4.1.4, running CentOS 5.7 32-bit. Java is JDK 1.6.0, just the basic yum install package.

This is a .policy file problem, not a filesystem permissions problem. Run it with -Djava.security.debug=access,failure to see exactly what is going on. Basically your .policy file either doesn't grant the required FilePermission or isn't being loaded.
NB a codebase of a local JAR file isn't going to work unless all the clients are in the same host.

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"));

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.

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 :)

-Djava.rmi.server.codebase Question.

When I study the meaning of codebase in
http://java.sun.com/j2se/1.3/docs/guide/rmi/codebase.html
, I am still confuse what is different between codebase
settings in Remote Object side and RMI Client side.
The command options -Djava.rmi.server.codebase=
http://myHost/myDir and -Djava.rmi.server.codebase=
http://wwwserver/mydirectory ( in Figure3 and Figure4 of
http://java.sun.com/j2se/1.3/docs/guide/rmi/codebase.html
) are set in which side ??
The option in Remote Object side seems no any work.
Who can explain its meaning ??
Thank you in advance... Alan.

Hi,
For the dynamic class loading to work, you should give
-Djava.rmi.server.codebase=http://some-server/
you can see that it supports http protocol.. So there should be one web server running on the server side so that client can call it by name or by IP address.. Then try running the program again. now it will work..
actually you should give this option on client side as it is the client who needs this property.. so in order to download classes the server machine should be addresable to the client in any method. if it is a LAN, try giving '\\computer-name' in the value of the property.. I haven't tried this, but I think you dont need a http server this time.. I am not sure abt this,,. check it out..
- Bibin.

Java.rmi.server.ExportException...

I am making a bridge code.
the server is in a package called bridgeserver.
The client in a package called bridgeclient.
I have compiled all files in the packages.
I do rmic bridgeserver.BridgeServer(name of server program) from jdk1.3
I do c:\jdk1.3 >rmic bridgeclient\BridgeClient(name of client).
then start rmiregistry
then when I do java bridgeserver.BridgeServer(runnign thr server) I get the follwowing exceptions:
java.rmi.server.ExportException : Unable to access remote reference,
nested exception is
java.rmi.server.SkeletonNotFoundException:
Skeleton class not found :bridgeserver.BridgeServer_Skel;nested exception is ;
java.lang.ClassNotFoundException :bridgeserver.BridgeServer-Skel
Is there sometyhign wrong with the classpath?

on your rmic line include the option
-v1.2
This should get rid of skeleton junk. (But of course may uncover other problems.)

URGENT: Need to read file on client side from a 9i form

Hi
I have developed a 9i form and I assumed I could use TEXT_IO to read a file on the client side and insert the data into a database table. However, I have just tested the form and discovered that TEXT_IO only looks for files on the application server and NOT the client side.
Does anyone know of a forms package in 9i that will do this for me? Using ftp to get the file onto the application server is not really an option.

Francois
We are sure that we do not have the WebUtil package installed in our environment. We are using a thrid party forms 9i application which we can tailor by adding our own forms to the existing menus. The third party application has some upload screens provided that are able to do upload a file without using WebUtil. Is there any other way this could be done? I have asked the third party to provide some asistance with this but they are not too forthcoming. Is there any other way you know of using Oracle/forms that allows a file to be read on the client side and sent to the application server? Oracle logs was mentioned by someone I talked to but this means nothing to me.

Load data from File on Client side (via Sqlplus)

Server OS: RedHat, Oracle 10g rel 2.
I am trying to load data from OS .txt files to clob field.
I am able to do this successfully using:
Oracle DIRECTORY
BFILE
DBMS_LOB.loadclobfromfile packageIssue is: this only works if my files and DIR are on database server.
Is it not possible "load clob from file" from client side, files being on client and exec command via SQLPlus. Is there any other option to load data from client side.
Thanks for any help.

Options:
1) Search for OraDAV
2) Learn about Application Express.

How to read and write Xml file at client side using JavaScript !

Hello,
i am new to javascript.
I have requirement to read and update XML file at client side.
Will you please guide what could be the best way to read and update XMl file using javascript.
Thanks,
Zuned

This is a Java forum,not a Javascript forum. Maybe you should ask here [http://www.webdeveloper.com/forum/forumdisplay.php?forumid=3&s|http://www.webdeveloper.com/forum/forumdisplay.php?forumid=3&s].

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

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