Rmi - rs232

hi
i have a problem
im using RMI comunication and one of the clases used on the server woks with rs 232 protocol, but when i compile the client class, i get this message in the console
RemoteException
java.rmi.ServerError: Error ocurred in server thread; nested exception is:
java .lang.NoClassDefFoundError: javax/comm/UnsupportedCommOperationException
at this time im not using the port, only when the programs runs and i click some button; i downloaded the commapi from the page, and both programs, the rmi and the other with the rs232 protocol works fine alone, i just dont know what happend,
thanks for the help

look up what java .lang.NoClassDefFoundError means

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Attachments:
MOTORTESTJIG.vi ‏729 KB

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With regards
Mohammed Jubaer Arif
Mobile: +61-0411215302
Personal Web: http://www.geocities.com/jubairarifctg/
Org. Web.: http://www.geocities.com/halimschamber/

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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.
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which will be deployed on remote server.
code ....
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reg.bind("server",server);
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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)
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Design problem: RS232 communication

Hi,
I have a design problem for communication with a device via RS232. Since I'm normally a C++ programmer I might just look at the problem from a wrong angle and hope for some hints how to do it in LabVIEW.
The scenario:
A device is communicating with the PC via RS232. The device permanently sends data packets. At the same time, commands can be sent to the device and it returns replies. Data packets and reply packets are arbitrarily mixed, i.e. after sending a command there could be a couple of date packets before the reply comes back but the packets can be distinguished by an identifier.
At least one, ideally several VIs should communicate with the device. Commands should be sent by pressing buttons and the incoming data should be parsed (the packets contain mutliple data streams) and shown on graphs or saved to files.
My initial idea:
Coming from C++ I wanted to build a class for the communication that permanently reads the incoming data and splits it to reply and data packets. This class would then have a function to send out a command and would return the reply or a timeout and it would be possible to register and unregister listeners (I wanted to use queues for this) for the various data streams.
The problems I ran into:
There were a couple but the two most pressing problems were: how could I communicate with the constantly running sample VI (e.g. to stop sampling) and how could I propagate changes to the class to it (e.g. new listeners). Since it is not returning I don't see a good way to implement it as in instance funcion (i.e. pass it the object). I could probably not let the sample function run continously but call it periodically from outside. However I planned to implement the class as a singleton, so it could be used parallely from different VIs.
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Thanks,
Tobias

tfritz wrote:
Hi,
thanks. Since almost the same thing was suggested to me in a German forum I guess this is really common practice (using one VI with different methods controlled by a queue). It still seems a little "unnatural" for me but my biggest concern (bad interface description) was shattered by the suggestion in the link you sent me to wrap these functions with wrapper VIs, thus caller VIs won't have to deal with the call-by-queue-mechanism. This might also be easier to port to a different implementation later. However I still see the danger that the continously running VI could easily become bloated.
It also requires me to change the way I have looked at VIs until now. In our course they told us that VIs are basically functions. Using this design patterns, the VI becomes more of a module, really (Like a C module implemented in a C-Source file). But I will try it. It sounds as if it could work.
I will still look into the OOP solutions a little more, though. Do I understand you correctly that you wouldn't recommend using LVOOP because it's still buggy? What about dqGOOP for example? This sounds like it could do what I need (however it doesn't seem to implement things like polymorphism, late binding and inheritance so I don't quite see what's so OOP about it. It seems more like programming with structures in C.)
I don't know if LVOOP is buggy or not. I think early on it was buggy and things have improved in recent versions. I have read that it doesn't have all the features that you would have in OOP like C. I wouldn't recommend it only because I'm not familiar with it at all. I can't recommend something that I'm not comfortable with. If you go that route, plan on spending time in these forums and in LAVA to reading up on what others have done. I haven't hard of dqGOOP.
But back to your suggestion. I still have a couple of questions:
- How do you return values from the module? Would you use a queue for that as well?
- Where would the parameter queue be held (created and passed to the VI)
I would store all of these in a functional global variable. This is the VI that stores data in shift registers. Ben's action engine nugget is an advancement on that. This allows for both the calling VI and the parallel running subVI to get and set the data as needed. It runs quickly so neither process should be forced to wait while the other VI is doing its thing.
- My VI has to be constantly sampling and this shouldn't be interrupted too long by other functions as adding a listener. However both functionalities have to access the same kind of data. Is there an easy way to parallelize this? Would the sampling be a case in the case diagram that's always used if no command was sent to the VI or would it somehow run parallely? Yes. There are a couple of ways of doing this. One would be for the dequeue to have a timeout function. In the event the dequeue times out, you run the code that is doing the acquisition. I think a better method is that the code that does the acquisition enqueues its own command again to the end of the queue. Let's say that is command A. So when case A finishes, it enqueues A, which seeds itself to run again. So if nothing else comes into the queue, it just executes A , A, A, A. But let's say another section of code needs to do something such as command B. It will slip B into the queue while A is executing. So you would A, B, then A again, because A would get slipped back into the queue when the first A finishes, but B has already been put in while the first A was running.
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I think you could do this. It may be a case where the VI is saved as a template (.vit) and you initiate it multiple times. I haven't needed to do this before, so I'm afraid I can't provide any details or useful tips.
Well, I will fool around some more. Thanks so much for your help. This is kind of exciting since the concepts are quite new for me. Btw, is there something like an academic theory (computer science) for LabVIEW? I came across functional languages in university but data flow languages are still a new concept for me.
Tobias
tfritz wrote:
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How is the path handled? Is it guaranteed that it always takes the VI from the project or does it just search for the first VI by that name it finds in the file structure? Does this still work when building an .exe from the project? What happens if the VI is already running? Can you test for this?
While I'm at it: is there a way to stop LabVIEW from searching for subVIs it can't find when openin a VI? This resulted in very unexpected behaviour sometimes where it would find the VI somewhere else (with the same name but maybe an older version).
In my case, I just had the path hardcoded. It is my only instance, I'm not planning on moving the VI's. If you don't have the path, it will take a VI by that name if it's in memory. If it isn't in memory, it starts searching relative to the calling VI's path. One thing I know, if you are dealing with relative paths, a subVI has a different relative path in an .exe as opposed to the development environment. The name of the .exe becomes a folder. So in development, if your sub VI is mySubVI.vi. In an executable, its path is MyExe.exe\MySubVI.vi
For all of this, I recommend searching the forums to get more details.
If it is searching for a VI, you can hit ignore. But of course you'd have to do it before it finds it. When you are dealing with versioning issues, I recommend making a backup copy of the entire directory structure elsewhere. Some location where it shouldn't stumble across it.

AT Commands over Bluetooth RS232 Connection

Hi all and thank you in advance.
I am trying hard to locate security related information about the following. If I establish an RS232 connection with a mobile phone through Bluetooth, is it possible then to utilize that connection to issue AT commands to the mobile phone in order to invoke the cellular modem? I have the impression that under MIDP such functionality is deliberately restricted for security reasons. Is this true?
PS.I know there are similar posts in the forum but non of them has been answered so I’m giving it a try.
Once again... thank you.

seanfisher, welcome to the forum. Please don't post in threads that are long dead. This question was asked 3½ years ago and it's hardly likely that Habib9, who hasn't visited these forums in the last 2½ years, is still waiting for an answer.
I'm locking this thread now and blocking your post.
db

Problem with socket factory in RMI over SSL in proxy setup

Hi
The following is the setup I have;
1. I have an application in which the server is running in https mode and I have exported my remote objects using ServerSocketFactory and ClientSocketFactory which will create SSLServerSocket and SSLSocket respectively.
2. When I run my connect a client to this server and invoke some method on any of the remote objects, I get the following exception:
java.lang.NullPointerException
at sun.rmi.transport.tcp.TCPConnection.getOutputStream(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.invoke(Unknown Source)
at com.acme.ems.server.app.main.TestSumImpl_Stub.addOne(Unknown Source)
at com.acme.ems.client.app.tools.EMSHaSftpSettings.okButtonActionPerformed(EMSHaSftpSettings.java:216)
at com.acme.ems.client.app.tools.EMSHaSftpSettings.access$000(EMSHaSftpSettings.java:28)
at com.acme.ems.client.app.tools.EMSHaSftpSettings$1.actionPerformed(EMSHaSftpSettings.java:183)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.Dialog$1.run(Unknown Source)
at java.awt.Dialog$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.Dialog.show(Unknown Source)
at com.acme.ems.client.utility.BasicDialog.showContainerInsideDialog(BasicDialog.java:103)
at com.acme.ems.client.app.tools.EMSHaSftpSettings.init(EMSHaSftpSettings.java:322)
at com.adventnet.nms.util.ConsumeKnownEvents.showTheFrame(ConsumeKnownEvents.java:197)
at com.adventnet.nms.util.ConsumeKnownEvents.actionPerformed(ConsumeKnownEvents.java:103)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.AbstractButton.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
My understanding is, when invoking remote object's method from the client, a the clientSocketFactory implementation will be called and an SSLSocket will be created for communication between remote server and client. In this case,my guess is somehow the createSocket() method of the clientSocketFactory is returning Null.The question is why?????Any help soon is appreciated.
Note that , we are doing this in a proxy set-up.

I've made a similer post.
I was able to get it working by doing the following
Make sure to add and equals to your RMISocketFactory's
something at least this
public boolean equals(Object obj)
return obj != null && obj.getClass() == this.getClass();
I had to enable the follong cypher suite SSL_DH_anon_WITH_RC4_128_MD5
but this leads to a possible man in the middle attack.
I posted to try and get that resolved. (see ssl lockup on handshake)

Problem with RMI in ADB T75 receiver

Hi:
I have a problem with an xlet that uses the RMI (IXC) API in the ADB T75 development settop box.
I export an object (of type MyObject) implementing the Remote interface, and, later, I import it with no problem.
The problem appears after importing the object, when I try to cast the imported object to the type of the exported object (type MyObject) for using it (example on page 371 of the marvelous Morris book).
If I import the object in the same xlet where I export it (a little bit useless), the process works fine as the class of the imported object (remoteObject.getClass().getName()) is the same of the exported object.
But, when importing the object from another xlet, doing the cast fails (ClassCastException). This time, remoteObject.getClass().getName() returns the name "stub_MyObject_ca_ba" ( "ca" is the OrgID and "ba" is the AppID of the exporting xlet). That is, the middleware is returning to the importing xlet an object of the stub class.
The ClassCastException seems to be right, as the the superclass of the "stub_MyObject_ca_ba" is directly java.lang.Object. That is, the types of the exported object (MyObject) and the returned object (stub_MyObject_ca_ba) are not in the same hierarchy.
Has anyone one explanation or solution?
May be a bug of the ADB T75 settop box?
Thanks in advance for your comments
Liga0068

Problem solved. This was posted by Pretorius_594 on Feb 27, 2004.
Sorry for bothering.
The problem was due to that I was doing a cast to the original object (MyObject). That is:
remoteObject = lookup(...)
MyObject importedobject = (MyObject)remoteObject.
I saw such an example in the Morris and Smith-Chaigneau book, but, definetively, that code seems not to work (at least in the ADB receiver)
Th right solution is to extend the Remote interface (MyRemote) and to cast the importedobject to that type. That is:
public interface MyRemote extends Remote ...
remoteObject = lookup(...)
MyRemote importedobject = (MyRemote)remoteObject.
Liga0068

I am trying to use the RS232 to control a circuit board. It would have to simultaneously output SerialClock, DataIn, and Chip Select signals, while also receiving DataOut signals; therefore 4 signals total. Does anyone know if it this is possible?

I am trying to splice 4 wires out of the RS232 serial cable (the 9-pin type) and wire them to a circuit board. The 4 wires would control 4 signals: DataIn, DataOut, SerialClock, and ChipSelect. The serial clock would synchronize the DataIn and the ChipSelect is asynchronous. DataOut must coincide with SerialClock also; therefore there are 3 signals that must be able to switch concurrently. All the handshaking enabled by RS232 is thus unnecessary in my opinion. Does anyone know of how this can be done?

I am trying to splice 4 wires out of the RS232 serial cable (the 9-pin type) and wire them to a circuit board. The 4 wires would control 4 signals: DataIn, DataOut, SerialClock, and ChipSelect. The serial clock would synchronize the DataIn and the ChipSelect is asynchronous. DataOut must coincide with SerialClock also; therefore there are 3 signals that must be able to switch concurrently. All the handshaking enabled by RS232 is thus unnecessary in my opinion. Does anyone know of how this can be done?

Rmi - rs232

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