RMI and JNI
Hi Everybody,
I've been stuck on a problem for now 3 days.
I'm using a C++ in my application, I've wrapped it using JNI and it works perfectly. Now I wanted to access these methods remotely, so I decided to use RMI (Remote Methode Invocation) to do the job.
I have 3 files:
CamControlImpl.java - RMI Methode Implementations
CamControlServer.java - RMI Server Application
CamControlMain.java - RMI Methode Interface
Now I've loaded my dll in "CamControlImpl.java" using 'System.load("c:\\mydll.dll");'. When I start the server, and execute my RMIClient I kinda get an "java.lang.UnsatisfiedLinkError" Exception.
The Dll works fine when calling methods locally without using RMI. Can JNI be used in RMI ? if yes, Any suggestions guys ?
I'm really stuck here.
Thanks in Advance
Uday Moorjani
You haven't said exactly what the operational link is between the client, the server, and the JNI code (if any). Nor have you shown anything about the code involved, directories involved, or methods of starting the server.
Post some code fragments and other info.
Similar Messages
-
Hi
Can anybody send me a sample code(HelloWorld type)that is based on RMI and uses native code(eg. win32).
SANJAYIf you're trying to do anything with native code, then you should be familiar with JNI API, windows or not.
Check out the JNI tutorials on this site and i'm sure they'll provide you with JNI tutorials and samples. -
What is the difference between RMI and JAX-RPC?
Dear All
First of all my understanding of RMI and JAX-RPC:
RMI is JAVA only version of RPC. It can't talk to any other language.
JAX-RPC is a part of JWSDP and if you implement your client and server with JAX-RPC, client written in any language can talk with JAX-RPC implementation.
What else makes them different and am I right with my understanding?
Finally, I would like to develop clients which will have a java class, say httpserver.java, which will act like a http server, listens to a http port. Now, Two such client will run in two different PC and I want to call a module from one client to another which should be accessible via my httpserver.java. For that which should be my choice RMI or JAX-RPC? Can I achive it with http get-post method, as I am expecting to read some value of variables from one client to the another.
Say class A has variable a, aa, aaa and clas B has variable b, bb, bbb. Now I want to read the value of b, bb, bbb from class A. How do I do that when class B is listening to a http port with my httpserver.java class.
Lastly, say B is listening to a http port and I want to send a file to B from A. How can I do that? Remember, B didn�t ask for that. How can A send a file to B when B is listening to a http port with my httpserver.java.
With regards
Mohammed Jubaer Arif
Mobile: +61-0411215302
Personal Web: http://www.geocities.com/jubairarifctg/
Org. Web.: http://www.geocities.com/halimschamber/simply put, RMI allows you to (semi) transparently treat remote objects as if they were local, and your distributed application can be written (more or less) like a "normal" java app. Sockets just give you a "raw" connection to work with, and you get to build up your application from that.
I hope that helped
Lee -
Please help: RMI and Swing/AWT issue
Hi guys, I've been having a lot of trouble trying to get a GUI application to work with RMI. I'd appreciate any help. Here's the story:
I wrote a Java application and its GUI using Netbeans. In a nutshell, the application is about performing searches. I am now at the point where I need exterior programs to use my application's search capabilities, thus needing RMI. Such exterior programs are to call methods currently implemented in my application.
I implemented RMI, and got the client --> server communication working. However, the GUI just breaks. It starts outputting exceptions, gets delayed, doesn't update properly, some parts of it stop working.... basically hysterical behavior.
Now take a look at this line within my server class:
Naming.rebind("SearchProgram", mySearchProgram);
If I take it out, RMI obviously does not work... but the application and its GUI work flawlessly. If I put it in, the RMI calls work, but the GUI's above symptoms occur again. Among the symptoms are null pointer exceptions which all look similar, are related to "AWT-EventQueue-0", and keep ocurring. Here's just snippet of the errors outputted:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.metal.MetalScrollBarUI.getPreferredSize(MetalScrollBarUI.java:102)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1615)
at javax.swing.JScrollBar.getMinimumSize(JScrollBar.java:704)
at javax.swing.ScrollPaneLayout.minimumLayoutSize(ScrollPaneLayout.java:624)
at java.awt.Container.minimumSize(Container.java:1598)
at java.awt.Container.getMinimumSize(Container.java:1583)
at javax.swing.JComponent.getMinimumSize(JComponent.java:1697)
at java.awt.BorderLayout.minimumLayoutSize(BorderLayout.java:634)
at java.awt.Container.minimumSize(Container.java:1598)
at java.awt.Container.getMinimumSize(Container.java:1583)
at javax.swing.JComponent.getMinimumSize(JComponent.java:1697)
at java.awt.BorderLayout.minimumLayoutSize(BorderLayout.java:634)
at java.awt.Container.minimumSize(Container.java:1598)
at java.awt.Container.getMinimumSize(Container.java:1583)
at javax.swing.JComponent.getMinimumSize(JComponent.java:1697)
at javax.swing.BoxLayout.checkRequests(BoxLayout.java:433)
at javax.swing.BoxLayout.layoutContainer(BoxLayout.java:375)
at java.awt.Container.layout(Container.java:1401)
at java.awt.Container.doLayout(Container.java:1390)
at java.awt.Container.validateTree(Container.java:1473)
at java.awt.Container.validateTree(Container.java:1480)
at java.awt.Container.validateTree(Container.java:1480)
at java.awt.Container.validateTree(Container.java:1480)
at java.awt.Container.validateTree(Container.java:1480)
at java.awt.Container.validate(Container.java:1448)
at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:113)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredMenuItemSize(BasicMenuItemUI.java:400)
at javax.swing.plaf.basic.BasicMenuItemUI.getPreferredSize(BasicMenuItemUI.java:310)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1615)
at javax.swing.BoxLayout.checkRequests(BoxLayout.java:434)
at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:251)
at javax.swing.plaf.basic.DefaultMenuLayout.preferredLayoutSize(DefaultMenuLayout.java:38)
at java.awt.Container.preferredSize(Container.java:1558)
at java.awt.Container.getPreferredSize(Container.java:1543)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1617)
at javax.swing.JRootPane$RootLayout.layoutContainer(JRootPane.java:910)
at java.awt.Container.layout(Container.java:1401)
at java.awt.Container.doLayout(Container.java:1390)
at java.awt.Container.validateTree(Container.java:1473)
at java.awt.Container.validate(Container.java:1448)
at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:113)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
There are no complaints about anything within my code, it's all GUI related whenever I make a bind() or rebind() call.
Again, any help here would be great... cause this one's just beating me.
Thanks!Maybe you want to change that worker thread to
not do RMI but anything else (dummy data) to see if it really is RMI, I doubt it, I think you are updating some structures that have to do with swing GUI and hence you will hang.
Just check this out. -
Connection to CRX via RMI and getting WeakReference value..... with an exception!
Hi there,
I have the following problem.
I opened a ticket in Day Care Support system, about CRX users/group membership that got lost while synchronization with our LDAP server.
Although when the user and the group had been created (and therefore taken from that same LDAP server), the membership was good.... but after some time the membership got lost......
So what i am trying to do now is a Java program that connects to CRX via RMI.
And gets the list of all the users from a group (aka membership).
The idea is to monitor the membership each seconds.
But when trying to get the property "rep:members" of the group, I have the following exception :
javax.jcr.ValueFormatException: Unknown value type 10
at org.apache.jackrabbit.rmi.server.ServerObject.getRepositoryException(ServerObject.java:13 9)
at org.apache.jackrabbit.rmi.server.ServerProperty.getValues(ServerProperty.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)"
I searched a little bit and found that "10" is the number for type WeakReference.
That's normal to me because memberships are stored in the group as a list reference to users linked to that group....
Anyways, what's not normal to me is that when the type is "10" the API does not let me get the Value (cf. ServerProperty.getValues() method)
Here is the program:
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.imageio.spi.ServiceRegistry;
import javax.jcr.Node;
import javax.jcr.NodeIterator;
import javax.jcr.Property;
import javax.jcr.PropertyIterator;
import javax.jcr.Repository;
import javax.jcr.RepositoryException;
import javax.jcr.RepositoryFactory;
import javax.jcr.Session;
import javax.jcr.SimpleCredentials;
import javax.jcr.Value;
public class Test {
public static void main(String[] args) {
String uri = "rmi://sma11c02.............:1234/crx";
String username = "admin";
char[] password = {....................};
String workspace = "crx.default";
String nodePath = "/home/groups/a";
Repository repository = null;
Session session = null;
try {
// Connection to repository via RMI
Map<String, String> jcrParameters = new HashMap<String, String>();
jcrParameters.put("org.apache.jackrabbit.repository.uri", uri);
Iterator<RepositoryFactory> iterator = ServiceRegistry.lookupProviders(RepositoryFactory.class);
while (null == repository && iterator.hasNext()) {
repository = iterator.next().getRepository(jcrParameters);
if (repository == null) {
throw new IllegalStateException("Problem with connection to the repository...");
// Creation of a session to the workspace
session = repository.login(new SimpleCredentials(username, password), workspace);
if (session == null) {
throw new IllegalStateException("Problem with creation of session to the workspace...");
// Get the targetted node
Node node = session.getNode(nodePath);
System.out.println("Node : " + node.getName());
System.out.println();
PropertyIterator properties = node.getProperties();
System.out.println("List of properties for this node :");
while (properties.hasNext()) {
Property property = properties.nextProperty();
System.out.print("\t"+property.getName() + " : ");
if (property.isMultiple()) {
Value[] values = property.getValues();
for (int i = 0; i < values.length; i++) {
System.out.print(values[i]);
if (i+1 != values.length) {
System.out.print(", ");
System.out.println();
} else {
Value value = property.getValue();
System.out.println(value);
System.out.println();
NodeIterator kids = node.getNodes();
System.out.println("List of children nodes for this node :");
while (kids.hasNext()) {
Node kid = kids.nextNode();
System.out.println("\tChild node : "+kid.getName());
PropertyIterator kidProperties = kid.getProperties();
System.out.println("List of properties for this child :");
while (kidProperties.hasNext()) {
Property property = kidProperties.nextProperty();
System.out.print("\t"+property.getName() + " : ");
if (property.isMultiple()) {
Value[] values = property.getValues();
for (int i = 0; i < values.length; i++) {
System.out.print(values[i]);
if (i+1 != values.length) {
System.out.print(", ");
System.out.println();
} else {
Value value = property.getValue();
System.out.println(value);
System.out.println();
} catch (RepositoryException e) {
e.printStackTrace();
} finally {
if (session != null) {
session.logout();
Here is the output of the below program:
Node : a
List of properties for this node :
jcr:createdBy : admin
jcr:mixinTypes : mix:lockable
jcr:created : 2011-10-25T16:58:48.140+02:00
jcr:primaryType : rep:AuthorizableFolder
List of children nodes for this node :
Child node : administrators
List of properties for this child :
jcr:createdBy : admin
rep:principalName : administrators
rep:members : javax.jcr.ValueFormatException: Unknown value type 10
at org.apache.jackrabbit.rmi.server.ServerObject.getRepositoryException(ServerObject.java:13 9)
at org.apache.jackrabbit.rmi.server.ServerProperty.getValues(ServerProperty.java:71)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:60)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37)
at java.lang.reflect.Method.invoke(Method.java:611)
at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322)
at sun.rmi.transport.Transport$1.run(Transport.java:171)
at java.security.AccessController.doPrivileged(AccessController.java:284)
at sun.rmi.transport.Transport.serviceCall(Transport.java:167)
at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:547)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:802)
at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:661)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:897)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:919)
at java.lang.Thread.run(Thread.java:736)
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 org.apache.jackrabbit.rmi.server.ServerProperty_Stub.getValues(Unknown Source)
at org.apache.jackrabbit.rmi.client.ClientProperty.getValues(ClientProperty.java:173)
at Test.main(Test.java:96)
Here is the list of jar files i'm using with this program:
2862818581 61388 crx-rmi-2.2.0.jar
732434195 335603 jackrabbit-jcr-commons-2.4.0.jar
1107929681 411330 jackrabbit-jcr-rmi-2.4.0.jar
3096295771 69246 jcr-2.0.jar
1206850944 367444 log4j-1.2.14.jar
685167282 25962 slf4j-api-1.6.4.jar
2025068856 9748 slf4j-log4j12-1.6.4.jar
Finally, we are using CQ 5.4 (CRX 2.2) with the latest hotfix and under Websphere 7.0
Best regards,
Vincent FINETJe suis absent(e) du bureau jusqu'au 17/04/2012
Je suis absent.
Je répondrai à votre sollicitation à mon retour le 17 avril 2012.
Cordialement,
Vincent FINET
Remarque : ceci est une réponse automatique à votre message "[CQ5]
Connection to CRX via RMI and getting WeakReference value..... with an
exception!" envoyé le 13/4/12 0:32:14.
C'est la seule notification que vous recevrez pendant l'absence de cette
personne.
Le papier est un bien precieux, ne le gaspillez pas. N'imprimez ce document que si vous en avez vraiment besoin !
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Toute publication, utilisation ou diffusion, meme partielle, doit etre autorisee prealablement.
Si vous n'etes pas destinataire de ce message, merci d'en avertir immediatement l'expediteur. -
Hi,
I have a problem, integrating an application with RMI and a Client side with swing.
I have un RMI object that does something, and in any time I want to inform to the client side rmi... I did something like:
// This is the REmote implementation
public MyRemoteImpl extends Activatable implements MyRemote{
EventListenerList listeners;
// code for activation, etc.......
public void addListener(MyListener l){
// add the listener in the list...
public void fireEvent(String msgEvent){
// in each listener that is MyListener, .doEvent(String msg)
// Methods that calls fireEvent...
// Mylistener interface..
public MyListener implements EventListener{
public void doEvent(String msg);
// The swing client side.
public MyClient extends JPanel implements MyListener{
MyRemote rem=null;
// In the start of ui.. Ido:
rem.addListener(this);
public void doEvent(String msg){
// Puts the message at one component....
}The problem is that when the doEvent of the Swing side is called, it is executing in the rmid... And the UI is not updated...
What I do wrong??
Thanks and Best Regards.I wrote an application that does something similar, it receives some event and modifies a JTree accordingly. You should try using the java.awt.EventQueue.invokeLater(Runnable) method. Something like this:
public void doEvent(String msg) {
// Determine what changes need to be made
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
// Only the GUI component modification calls need to go here
} -
Hello
I am facing a problem related to Swing and JNI. Actually I have to call a native function on the action of a button, so I am using Swing to develop GUI. When I use Jframe and Jbuttons and on the action event of JButton when I call the native function of a different class, then the function works fine but suddenly program gets terminated. Program does not get terminated when I click on other buttons but when I click on the button containing native method, after clicking, the whole GUI frame gets removed and the program terminates. While debugging it does not give any error, infact the function works perfectly fine and the only thing that I came to know is that the application gets terminated and it displays "terminated, exit value : - 1073741819"
Please help me out and reply as soon as possible.I imagine it depends on what's in the JNI code. Is this a JNI that you've created? Is it a large program? Can you post the code? Are you sure that you're compiling the C/C++ code with the correct parameters? (you may need to ask some of this in the JNI forum) Is it thread-safe? Are you calling its methods on the EDT?
-
i know this might sound silly but i am new to rmi ( to java too )
i want to understand the difference between rmi and other protocols such as http,ftp and so.
now what i think i know - and sometimes think im not sure i know or
perhaps im sure i know nothing about - is that rmi is java specific and can only work with java while http is different if im not wrong.. and rmi does not require http r8?
so how can rmi work over http or ftp ..,( can it in the 1st place ?)Which version of WLS you are using?
Applet should also need to satisfy the version requirements similar to
standalone java client. With WLS 5.1, it may work. But, it will not work
with 6.* servers.
Again, the JRE versions in the Netscape and IExplorer are different. So the
applet, working in IE may not work on Netscape. It is better to test a
sample application, than taking assumptions.
Cheers,
..maruthi
"Andrea Musumeci" <[email protected]> wrote in message
news:3cb1dcba$[email protected]..
can an applet written in java 1.1.x work in a browser using weblogic rmiwithout a plugin? I need to create a java chat applet with callback. Tnx in
advance -
Does ATS load testing support Java RMI and T3 protocol?
Hi Experts,
Does ATS load testing support Java RMI and T3 protocol or EJB(J2EE)?
Thanks!Joseph,
Oracle Application Testing Suite is mainly used for testing of applications from a end user perspective and offers an intuitive capture/replay for web, Siebel, EBS, JDE, Fusion apps or SOA based application through WebServices WSDL imports.
The scripting environment (Oracle OpenScript) does not support script creation by recording JAVA RBI or T3 protocol as we lack a recorder for it, but the scrips are created as pure JAVA code so you could use the JAVA language to write a small RMI cor T3 client for your testing.
We have customers that have used Application Testing Suite to test non-UI based testing, like: JMS, FTP, Tuxedo and others, but it require a bit of coding.
Please let me know if you would like to know more or discuss your options
regards
Mikael Fries
Principal Product Manager / Oracle -
I would surmise that the problem you are seeing is the result of the fact
that we do not except standard Java RMI calls using the functionality in the
JDK. You must use the WebLogic implementation of RMI. It is exactly the
same in terms of APIs, but we have gone through and optimize the underlying
protocol.
Please see the documentation for more details.
We offer both RMI over IIOP and RMI over T3.
Thanks,
Michael
Michael Girdley
Product Manager, WebLogic Server & Express
BEA Systems Inc
Mario Felarca <[email protected]> wrote in message
news:[email protected]..
Hello,
I was trying to get a simple callback demo working using standard java
RMI and the WLS5.1. Unfortunately, although things seemed to compile
and launch smoothly, when the client started up and tried to talk to the
WLS I would get the following error:
weblogic.rmi.server.ExportException: A description for CallbackImpl was
found but it could not be read due to: [Failed to find a stub for [class
CallbackImpl] implements at least one interface [interface Callback]
which extends Remote.]
weblogic.rmi.StubNotFoundException: Failed to find a stub for [class
CallbackImpl] implements at least one interface [interface Callback]
which extends Remote.
I tried determining if this was a classpath problem, but all my efforts
kept producing this result.
On the flip side, if I retool my objects slightly in order to make them
use weblogic.rmi.*, then everything works perfectly.
Is there a tradeoff to using weblogic.rmi over java.rmi?
Also, does anyone have any ideas as to what might be causing my error
when using standard rmi?
Thanks so much in advance,
Mario- -
hello,
i have develop a simple application using RMI. It was running perfectly from command prompt.
Then i imported the project into netbeans 6.1. Then when i run it the server looks running normally but when a client try to connect to the server it given an error
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: ........(No security manager: RMI class loader disabled)
Can someone help suggest a solution
ThanksHi!
Please tell me how could you get netbeans 6.1 to recognise an RMI project.
I have too, tried to import some old java files (two rmi interface files a server implementation and an applet) into netbeans 6.1. As far as i can tell it completely refuses to work with RMI, and i have not found ANY support on the internet so far, to how to do it, or any working rmi modules for netbeans 6.1 ...
Years old rmi developement, what worked nicely under windows 95 (good old days lol) does not wish to work for me now...
Should I return to use age old enviroments, or what?
I would deeply appreciate any help from You, or anyone able.
Thanks! -
Hi
I have a simple question related to RMI and concurrency.
I have a server and several clients calling remote objects concurrently.
How is concurrency usually handled when one used RMI ?
Can we make use of "synchronized" on some method of the remote objects ?
I have read about risk related to performance and worse, some problems of deadlock if the synchronize is not well organized.
Is there other ways to deal with that ?
Thanks in advance for providinge me any information or suggestion.RMI is inherently multithreaded. If you have specific remote resources that you want protected from concurrency, then define all of the accessor methods to be synchronized. (I don't think you can get away with making the remote methods synchronized; I would instead figure out what which resources I want to protect, and only protect those particular objects.)
Could there be problems? Maybe. But these are absolutely standard coding techniques. -
Hello!
I'm using the RMIAdapter sample of Oracle to check the basic mechanism of rmi and wireless.
Does anybody now, if there are some known problems with wireless regarding this subject?
I have written both: the adapter and the client code. So far so good. But when I try to point a masterservice
to this adapter, there are some strange results:
If I define the RMI Service URL in this way: rmi://localhost:port, ASW accepts the input, but using the
service returns an IllegalArgumentException in the logfile.
If I define the RMI Service URL with its ServiceName (= rmi://localhost:port/ServiceName, ASW doesn't accept
the input.
So my question is: where's the error? As far as I know, a "correct" RMI URL consists of the following parts:
rmi://<hostname>[:<port>]/servicename. It would be the second above-mentioned trial.
Why does ASW rejects this kind of RMI Service URL?
So it would be great, if someone could help me out with the RMI magic of ASW.
Thanks a lot in advance,
Heike SkokHello Heike,
Here are the values for the RMIAdapter Init Parameters:
RMI Server URL: rmi://localhost:2099/Sample
Remote interface: oracle.panama.adapter.rmi.SampleInterface
(assuming that you didn't make any changes in the sample source code).
Here are some steps that the documentation does not describe in details (assuming that developers are familiar with RMI).
1. I copied SampleInterface.class and SampleImpl.class in $ORACLE_HOME/wireless/server/classes/oracle/panama/adapter/rmi directory
2. I ran
rmic -d . oracle.panama.adapter.rmi.SampleImpl
from $ORACLE_HOME/wireless/server/classes directory to generate SampleImpl_Stub.class and SampleImpl_Skel.class
3. I ran
java oracle.panama.adapter.rmi.SampleImpl
from $ORACLE_HOME/wireless/server/classes directory to start my RMI server.
You have to start the remote RMI server first before you can create the MasterService. The RMIAdapter will connect to the remote RMI server during initialization. The remote RMI server will print out
"Sample bound in registry" if started correctly.
If you have problems with the RMI registry then you may have to change JAVA_HOME\jre\lib\security\java.policy file and add the following:
grant {
permission java.net.SocketPermission "*:1024-65535",
"connect,accept";
permission java.net.SocketPermission "*:80", "connect";
After doing all that I was able to successfully run RMIAdapter based services.
Thanks,
Hristo Tonev -
Can we use applets as user interfaces with sockets, RMI and J2EE
Dear Sir or Madam,
Since I am a TA for software architecture class, some one ask me the following question: I think the answer is "No" based on the document on http://java.sun.com/sfaq/
How I answer the quesions? Looking forward your help!!!
1.You may have 2 applets and 2 html files. One applet with one html file may stay at a client PC and run on this PC, and the other applet with the other html file may stay at a server PC and run on this PC. In this case, all the applets are run locally.
2.Could applets works with sockets, RMI and J2EE?
3.Can we use applets as user interfaces with sockets, RMI and J2EE?
Thank you very much!
Best regards,
JingThe scenario you paint doesn't quite make sense. The "server PC" wouldn't be running an applet, normally, since applets are by definition in a web browser page, and most likely involve user interaction, and "server processes" generally are done without user interaction.
The security rules around applets are that -- by default -- applets can connect with sockets ONLY to the server from whence the applet was loaded. RMI uses sockets (J2EE is too broad a spec) and hence RMI calls would also be limited to the server from whence the applet was loaded. Within that limitation, an applet could open all the sockets it wants, so long as they are all on the server from whence the applet was loaded.
If you want two applets on two different systems to communicate with each other, the simplest way is to have them rendevous through a server process on the server(s) from whence each applet was loaded. Maybe it's PC-a <-> server-a <-> server-b <-> PC-b ...? Or maybe PC-a and PC-b both are talking to the same server.
The limitation is rooted in the security subsystem. You can specify a policy file and override anything in the security subsystem. That does mean signing the applet and then cajoling the user into agreeing to grant greater levels of security than the default. In such a case you can open sockets more broadly and then PC-a could talk directly to PC-b without going through any servers.
- David -
Hi everybody,
I am doing one of my projects in university which involve remote method invocation.
I wrote a simple program using RMI and it works when I am running it from the console, but I am unable to run it in NetBeans 5.5.1
I found out that I need to add this text in build.xml file in my project
<target name="-post-compile">
<rmic base="${build.classes.dir}" includes="**/Remote*.class"/>
</target>but still I am receiving this notification
Trouble: java.rmi.ConnectException: Connection refused to host: localhost; nested exception is:
java.net.ConnectException: Connection refused: connectMay be anybody know how to make it work properly?
Thanks!So it works in the Console but not NetBeans?
Then your question belongs on a NetBeans specific forum and not a forum on Java programming in general.
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