RMI Beginner question.

Hi, i have just started learning RMI and doing some small exercises. I have a question, how to get a notification(e.g, "Client connected") on RMI server whenever a client connects? pls help me.
thanx in advance.
bye.

Not quite clear what you mean by "connected". If you mean "the user accessed my server program", then the answer is that a server method has been called, and you thus have your notification. At that point you can do anything you want-log it, pop up a window, write a message to the console, ... .
But maybe I'm missing something?

Similar Messages

Beginner Question

Hello all, hopefully I have posted this to the correct LiveCycle board!
I'm new to Acrobat and LiveCycle in general. I'm working out of windows LiveCycle Designer 8.x and my question is as follows....
I'm working off of the "Quote" Form Template and what I am looking for is a way to make the rows of the Table expand as needed. I will be converting this Template into a "Purchase Order" form, and there will be many occassions where I will need to increase the table rows - perhaps onto a second or even third page - due to the volume of different items I will be seeking prices on at a given time.
Long story short I would like to take this "QUOTE" form template and make it such that if needed, I can expand the table size one row at a time, pushing the content beneath (Comments, subtotal, etc) onto the next page....
Hoping I have explained my query well enough, Could anyone provide me a solution or point me in the correct direction?
Many thanks!

As a followup, so as not to clog the board with numerous threads I have another beginner question
For the sake of hypotheticals I am creating a dynamic PDF form. This pdf is a Purchase Order Form, with a table in the Body that will expand/contract as the form user needs. (EXA- Default table size is 5 items, however user is creating an order for 12 items, he/she can increase the table rows to desired capactiy.) It will be a very simple layout. All data for the form will come from manual entry, no XML data binding going on.
My new question is as follows:    Is there a way I can have this user's Adobe reader or Adobe acrobat software remember previous data entries, so that if 4 weeks after ordering widget X he/she needs to place another order for widget X, the software will autofill the table as he/she types into the table cell?
This would be similar to how Excel will start to autofill if it recognizes a previously entered value from some other cell in the worksheet (workbook?)
EXA-
[NAME]   [MODEL]   [QTY]   [PRICE]
Widget           A            433        $30.00
Would it be possible for the software to notice that I'm typing the word "widget" somewhere after typing "wid" ???
Many thanks for any and all followups, I'm a teenager trying to help out in my father's small business. They are in the darkages here and I'm doing my best to self teach.
Thanks.

Beginner question: Can I apply one formula to all cells in a column?

Hi,
I'm new to spreadsheets, so apologies for asking what is probably a very simple question.
I want to apply a formula that divides the values in one column (W) by values in another (AX) for a table containing 3000 rows, and outputs the result for each row into the appropriate cell in the new column I've created.
Numbers 09 'help' hasn't helped to this point.
Thanks in advance for any assistance.

GeoBrett wrote:
Numbers 09 'help' hasn't helped to this point.
Besides Numbers '09 Help there are two other useful resources available in the Help menu: the Numbers '09 User Guide and iWork Formulas and Functions Help.
For "Beginner questions," my first choice would be the User Guide. For the specific question you asked, a quick scan of the chapter on "Using Formulas and Functions" (pp 83-96) will provide some useful information. Start in the neighborhood of page 93.
Regards,
Barry

Beginner question regarding 32-bit mixing and mixdown workflow

Hello
I have a beginner question regarding 32-bit mixing and mixdown.
If I edit some 16Bit, 44.1kHz Stereo WAV Files and put them into multi-track view to do crossfades, how should I do the mixdown?
Audition shows me in multi-track view, that it is doing 32-Bit mixing.
Can I just mixdown to 16Bit, 44.1kHz Stereo without any dithering (as the files are 16Bit, 44.1kHz Stereo to begin with), or will I lose quality that way?
I will be performing a normalization to 96% to the mixdown and then split to tracks in Audition, as in the end I want to to have an audio CD.
I guess I could mixdown to 32Bit, then normalize and in the end save back to 16Bit, 44.1kHz Stereo WAV (with dithering, I suppose?), but I want to avoid any unnecessary converting steps.
Greetings

Any time you do any processing on a 16bit file in 16 bit only it will degrade the audio slightly due to rounding of the calculations. Working in 32 bit floating point (Audition's default) takes account of all bits generated due to processing.
So it is always best to work in 32 bit, even if your originals were 16, all the way through until the last stage of saving the files for CD burning. Any losses due to conversion will be insignificant against those due to working 16 bit.

Beginner question - how to efficiently check if a photo is part of the selection

Dear all,
Sorry for this beginner question, however I don't know how to solve it and I'm sure that there is a quick and easy answer to this:
My target is to get all the "heads of stack" (photos with Position 1 in stacks) of the selection ("photos" below).
for i, photo in ipairs( photos ) do
local photoName = photo:getFormattedMetadata('fileName')
   if photo:getRawMetadata( 'isInStackInFolder' ) then
   --Photo is in a stack
        local photoHeadOfStack = photo:getRawMetadata('topOfStackInFolderContainingPhoto')
        local stackPos = photo:getRawMetadata( 'stackPositionInFolder' ) -- get the position in the stack
        local photoHeadName = photoHeadOfStack:getFormattedMetadata('fileName')
        app:logVerbose("Photo nb ^1, name ^2 is in a stack with the position ^3", i, photoName, stackPos)
        if stackPos == 1 then
        -- photo is master of the stack
             stackTop[#stackTop+1]=photo
             app:logVerbose("Photo ^1 is top of the stack ^2", photoName, #stackTop)
             -- check if couple if correct
        elseif photos.photoHeadOfStack then
             app:logVerbose("Photo ^1 is in a stack, but not on top. Top of the stack already selected", photoName)
        else
             stackTop[#stackTop+1]=photoHeadOfStack
             app:logVerbose("Photo ^1 is in a stack, but not on top. Top of the stack ^2 - ^3 ", photoName, #stackTop, photoHeadName)
        end
end
end
In the if structure in the middle checking the Position in the stack, if the Position is not 1, I would like to check if the photo heading the stack ('photoHeadOfStack') is part of 'photos'. I tried 'elseif photos.photoHeadOfStack then' and 'elseif photos[photoHeadOfStack] then' but it doesn't work ->this elseif is never true even if 'photoHeadOfStack' is part of 'photos'.
Is there anyway to have this check done without checking "manually" photos ?(via for example a for Loop)
I'm sure that Lua proposes this, but I don't know how...
I thank you for your Support!

    --[[ This code creates "stackTops", an array of LrPhotos that are the
    tops of all the stacks containing photos in the array
    "photos". ]]
stackTopSet = {}
for _, photo in ipairs (photos) do
    local stackTop = photo:getRawMetadata ("topOfStackInFolderContainingPhoto")
    if stackTop ~= nil then stackTopSet [stackTop] = true end
    end
stackTops = {}
for photo, _ in pairs (stackTopSet) do table.insert (stackTops, photo) end

Beginner Question: SA520 Admin access through WAN port

Dear all,
I've a beginner question regarding my brand new SA520: How can I configure the box so that I'm able to access the admin GUI not only through the LAN ports but also from the WAN ports?
I tried already to allow inbound traffic to the firewall's internal IP address (not sure if done right, so) and granted the admin user access profile from WAN and LAN: I can access the box from the LAN but not from the WAN. Any ideas?
Thanks,
Eric
PS: Yupp, I know that it's not a good idea to expose a FW admin GUI to the WAN - but this is only a lab environment

Go to Administration -> Users.
click on the 'Edit User Policies' 'Login' button. It's there you can enable WAN access.

Beginner question - using pre for flexibility in text?

Hi,
Apologies for the beginner question, but I am struggling to work out whether it is more sensible to use <pre> in all my texts, as it seems more flexible.
It seems that when I use <p> - paragraph - I can't use multiple space bars to align certain bits of text, but more disruptively I have gaps between text when I press Enter (I guess this defines the paragraph, but isn't always wanted).
Well, basically, <pre> seems more flexible, but it behaves strangely sometimes. What do other people use?
Many thanks!
Ivan Reshetilov
http://www.ivanreshetilov.co.uk

Hi Ireshe, just a beginner like you. Have never heard of <pre> tags, use <p> tags. If you hit SHIFT enter after a sentence this puts in a <br> tag or line break which basically leaves a blank line between text.
If you add     &nsbp;    or lots of them between words this gives you an extra space between letters. How all your paragraphs sit on the page is defined by CSS. E.g.
p {
     margin:0;
     padding: 5px 0 0 10px;}
This would place all text within <p> tags on your page, with a 5px gap at the top, no space to the right or bottom and 10px space to the left. Hope this helps, good luck!
Amanda
www.kimberleywebdesign.com.au

Beginner question: Configure Tomcat for JAAS?

Hi,
This is a beginner question :-(. I'm trying to get JAAS to work on my Tomcat (6.0.12) installation. I used code from a Javaworld article (http://www.javaworld.com/javaworld/jw-09-2002/jw-0913-jaas.html)
Of course I had to configure my Tomcat to work together with JAAS. The document I used is: http://tomcat.apache.org/tomcat-6.0-doc/printer/realm-howto.html
According to the Tomcat doc I have to do the following steps before I can use JAAS to authenticate a user:
1. Develop your code. Place the compiled classes in Tomcat's classpath
2. Setup a login.config file for Java, and tell Tomcat where to find it (set JAVA_OPTS)
3. Configure the JAASRealm in your server.xml
1 Develop code: I use the following classes:
PassiveCallbackHandler.java
RdbmsCredential.java
RdbmsLoginModule.java
RdbmsPrincipal.java
These classes I put in the package rdbmsjaas.
In the %CATALINA_HOME%/webapps/Javaworld_Jaas/WEB-INF/lib directory I created the rdbmsjaas.jar file.
The jsp is called jaas.jsp, and is stored in %CATALINA_HOME%/webapps/Javaworld_Jaas
2. Setup login.config
In %CATALINA_HOME%\conf I saved the file Javaworld_all_that_Jaas.config, containing:
Example {
   RdbmsLoginModule required
   debug="true"
   url="jdbc:mysql://localhost/jaasdb?user=javauser&password=javadude"
   driver="com.mysql.jdbc.Driver";
};I created an XP Environment Variable JAVA_OPTS with the value <-DJAVA_OPTS=-Djava.security.auth.login.config==C:/Program Files/Apache Software Foundation/Tomcat 6.0/conf/JavaWorld_All_That_Jaas.config> (excluding < and >)
I used the fully qualified address, instead of $CATALINA_HOME/conf/JavaWorld_All_That_Jaas.config. I think XP balks when it sees $CATALINA_HOME).
3 Configure JAASRealm in server.xml
In %CATALINA_HOME%\conf\ I changed web.xml. I added the following lines:
      <Realm className="org.apache.catalina.realm.JAASRealm"
             appName="jaas"
             userClassName="rdbmsjaas.RdbmsPrincipal"
             debug="99"
       />If I run the jsp from http://localhost:8080/JavaWorld_Jaas/jaas.jsp, I can enter my username/password, but when I click the Submit button, I get:
Caught Exception: java.lang.SecurityException: Unable to locate a login configurationWhere did my configuration go wrong?
Abel

You will need a JSP/servlet engine such as Tomcat - Apache alone won't do it.
I haven't seen any tutorials on set-up but the Tomcat documentation includes info on how to link to Apache. There are also books you can buy - check out the online book stores such as Amazon.
There's also a lot of info on this forum.

Beginner question: creating my own virtual instruments from samples

Hi, I have a beginner question. I'd like to make a click-track, but I want to use my own sounds, either recorded or from the internet. Can I do this with Logic Express 7, or do I need Logic Pro 7 and the EXS24?
Thanks,
Ryan

I think you can do it, but it might be a pain.
You could import a sample of a single click and just paste it into every beat on the Arrange Page.
Other than that, you might need the sampler included with Logic Pro

RMI direction question

Hi All,
I am new to Java and would like to write a robust multi-tier client server application and is not certain whether RMI is the
best approach to use. As a result, here are the following questions on this topic:
( i ) Basically, I need to be able to initiate some native commands (e.g. ls -al > /tmp/junk...) on both client and server
side and be able to retrieve the output back. There are numerous method to do this (e.g. SOAP, ORB, webservices, LipeRMI...). Nevertheless, my question is whether RMI is still the simplest or straight forward approach as opposed to having to learn another protocol (e.g. XML, webservices). If not, what is the best/latest method to achieving the same objective?
( ii ) One of the problem encountered when going through those RMI tutorial exercises were the requirements to have a
webserver running on both client and server in order for dynamic class loading to work properly. I wonder whether there is a better way to do this without having both client server dependency?
( iii ) Could webservice or SOAP be able to do the same thing?
( iv ) Should I not be concerned with this low level communication since EJB will handle this part?
( v ) Are there any other RMI user forum, website, useful documents on this topic?
Any suggests would be much appreciated.
Many thanks,
Netbeans Fan.

i ) if your protocol is simple enough you can use plain sockets, maybe with combination of serialization.
If you need object level protocol, RMI is the simplest to learn and use from the methods you mentioned.
( ii ) First, you can use any other shared storage (like NFS, SAMBA) for dynamic classloading.
If you develop both the client and the server and the server does not change independelty of the clients (in terms of API) you can
place all the files that are required by the client (stubs, etc) on client's classpath and avoid dynamic classloading altogether.
( iii ) yes.
( iv ) why do you plan to use ejb. what is the context of your application?
( v ) which topic? RMI in general?
I've collected a list of some useful resources for the beginners at
http://www.genady.net/rmi/v20/general-resources.html
This forum is also a good place to ask questions.

Beginner question about granting access rights

Hi, am a total beginner, just a very simple question. I have created a number of tables with my admin account that I would like user accounts to be able to see (they should only be allowed to see these few tables)
I then created a user account called EDWARD with just the basic connect access right (I don't want them to be able to create/delete tables etc, just to be able to query the tables I have created above and to add rows to these tables)
Google searching has lead me to the grant statement, so I tried this from the admin account:
grant select, update, insert on CUSTOMERS to EDWARD;
This statement executes correctly but when I log in the EDWARD account I cannot do any of these things, instead I get the error: ORA-00942: table or view does not exist
Any ideas?
Thanks

>>Would it be better to create a separate account called 'ADMIN' perhaps that I use for
my application admin and then grant them appropriate access to confidential tables
rather than logging them in as the SYSTEM?
Yes, this is what I would advise, since SYSTEM (like SYS and several others...) is not user like other, it's better do not work and create object under this one. Keep it for Oracle administration usage only, not for application administration, create your own schema for this.
Nicolas.

Beginner Question - transferring username from login page to next page

Hi,
Beginner level Question ; would appreciate kind reply,TA
How can I implement the following scenario in abap?
I've a login screen wherein user enters requisite credentials.Once authenticated the transfer goes to next screen called erp_training.On this I need to implement the welcome ******* functionality where ******* represents the entered username from the first screen.(Like what happens in most emails when we login in)
Edited by: ItsmeAnkit on May 18, 2011 12:52 PM

Hi Ankit,
Ur query:
Implement the welcome ******* functionality where ******* represents the entered username .
The User who entered in the previous screen has his credentials like username stored in SAP SYST field sy-uname.
Please refer to the following link.
Display information message in SAP Initial Screen
try to code the message or use WRITE TEXT in the Userexit.
based on the following.
data: g_msg type string.
Change the sy-uname to character.
concatenate "Welcome to the Screen of ERP Training" sy-uname to g_msg
write g_msg.
Please do revert if the above is not correct solution for your problem
Thanks
Sri

Beginner question: How to create a duplicate

Sorry to ask such a basic question .. I'm a beginner! Can't seem to find out how to create an exact duplicate of a photo I have finished editing ... so I can create a black & white version ... can someone help?

You are welcome, welcome..... ........The nicest and fastest reply in some time!
There are a ton of tutorials available online, and if you have any trouble finding same, post back and recommendations will be made.

Beginner Question: How to put 5 V on an output?

Hi everybody,
I am an absolute beginner here, a Biology student that has to do electronics in Labview now...
I want to do as much of this myself as possible, but need truly beginners hints, hoping to be clever enough to put it together myself with your information.
I need to control some outputs, and monitor some inputs. I am focusing on the outputs at the moment.
Questions:
How do I make a block in my block diagram that can put a variable voltage on an output? I need two controls, one that puts a voltage on an output of 0 to 10 V continuously, the other puts a voltage on an output of 0 to 5 V in increments of 0.1 V
Any hints will be highly appreciated. I have Labview 6 to work with. Pointers like 'look at p
age XX of the manual' will do, but descriptions here, or through my mail... anything will be highly appreciated.
Thanks in advance

In article <[email protected]>,
"Erado" wrote:
> That's the beauty of this, I am not entirely sure (yet) I am going to
> get a good look of the setup in about a month, but they want me to
> prepare a concept VI before then. To me that made little sense, but my
> comments on it hit a brick wall...
Well, for me and my past gigs this has been a very common situation. When
I worked for telecom we would have to develop apps for instruments that we
wouldn't receive for six months. Luckily we had the basic concept of how
they were supposed to run and this was adequate for development. It
sounds like you're in a similar situation.
> What I do know is that over two of the terminals there is a 5V voltage
> applied in steps of 0.1 V. So I should put in something that makes it
> possible for me to control this output in 50 steps of 0.1 V.
Lemme see if I understand you from this post and your first one. You
would like to buid a user interface that includes the following:
1) A boolean control that gives these two options:
a) output a continuous voltage in the range of 0-10 volts b) output a
ramping voltage starting at 0 (or 0.1) volts and ending at
5 volts using 0.1 volt increments with a dwell time of x mseconds
2) A boolean to stop the application
(perhaps another one to pause it)
3) Several numeric controls:
a) numeric control for the output voltage b) numeric control for the
dwell time (optional) c) numeric control for the voltage increments
(optional) for if the
user wants to use values other than 0.1 volts
4) An indicator that shows what the measured output voltage is. This is
good for verifying your output signal. A chart would be nice.
This is a top down approach which is helpful for laying out the
application's user interface. The next thing you want to do is build some
subVIs to simulate your voltage signals. Once you get some hardware you
can simply replace these simulation subVIs with the real ones that
actually communicate the hardware.
I'm not sure if your measuring the output voltage too. I kinda just
assumed this but that would require another subVI. I won't tell you how
to build the subVIs (I can't take all the fun out this) but I hope I've
pointed you in the right direction.
Merry x-mas!
-Kevin
PS: learn how to play with control references. they're very convenient
when you need to update the front panel indicators with data from a subVI
sitting in its own continuous loop. it avoids global variable abuse.

Beginner Question - Help Needed for EJB QL Sample Application

I'm working with a group of student interns, like myself, and we've been given an assignment to work with Oracle. All of us have no training or experience with this, so we're just learning as we go.
I've been trying to run the EJB QL Sample Application (http://www.oracle.com/technology/sample_code/tech/java/ejb_corba/ejbql/Install.html), but I keep running into problems at step 3.
Now, we will deploy the sample application onto OC4J. Open another command prompt and go to the folder <OC4J_HOME>/j2ee/home and run the following commands one-by-one
> java -jar admin.jar ormi://<machine_name>:<admin_port> admin <admin_pwd> -deploy -file <SAMPLE_HOME>/build/ejbql.ear -deploymentName Ejbql
> java -jar admin.jar ormi://<machine_name>:<admin_port> admin <admin_pwd> -bindWebApp Ejbql ejbql-war http-web-site /ejbql
where,
<machine_name>      Name of the machine where OC4J Server is running
<admin_port>      Admin Port on which the OC4J server listens. This value by default is 23791 unless explicitly changed by the user
<admin_pwd>      Adminstrator password to access OC4J. The default value is welcome
When I do this step I get this error:
Error: Unable to find java:comp/ServerAdministrator: Lookup error: javax.naming.
AuthenticationException: Invalid username/password for default (sds); nested exc
eption is:
javax.naming.AuthenticationException: Invalid username/password for defa
ult (sds)
com.evermind.client.orion.AdminCommandException: Unable to find java:comp/Server
Administrator: Lookup error: javax.naming.AuthenticationException: Invalid usern
ame/password for default (sds); nested exception is:
javax.naming.AuthenticationException: Invalid username/password for defa
ult (sds)
at com.evermind.client.orion.Oc4jAdminConsole.executeCommand(Oc4jAdminCo
nsole.java:105)
at com.evermind.client.orion.Oc4jAdminConsole.main(Oc4jAdminConsole.java
:27)
javax.naming.NamingException: Lookup error: javax.naming.AuthenticationException
: Invalid username/password for default (sds); nested exception is:
javax.naming.AuthenticationException: Invalid username/password for defa
ult (sds) [Root exception is javax.naming.AuthenticationException: Invalid usern
ame/password for default (sds)]
at com.evermind.server.rmi.RMIContext.lookup(RMIContext.java:153)
at com.evermind.client.orion.Oc4jAdminConsole.executeCommand(Oc4jAdminCo
nsole.java:102)
at com.evermind.client.orion.Oc4jAdminConsole.main(Oc4jAdminConsole.java
:27)
Caused by: javax.naming.AuthenticationException: Invalid username/password for d
efault (sds)
at com.evermind.server.rmi.RMIConnection.connect(RMIConnection.java:2410
at com.evermind.server.rmi.RMIConnection.connect(RMIConnection.java:2226
at com.evermind.server.rmi.RMIConnection.lookup(RMIConnection.java:1692)
at com.evermind.server.rmi.RMIServer.lookup(RMIServer.java:727)
at com.evermind.server.rmi.RMIContext.lookup(RMIContext.java:134)
... 2 more
---- Embedded exception
javax.naming.AuthenticationException: Invalid username/password for default (sds
at com.evermind.server.rmi.RMIConnection.connect(RMIConnection.java:2410
at com.evermind.server.rmi.RMIConnection.connect(RMIConnection.java:2226
at com.evermind.server.rmi.RMIConnection.lookup(RMIConnection.java:1692)
at com.evermind.server.rmi.RMIServer.lookup(RMIServer.java:727)
at com.evermind.server.rmi.RMIContext.lookup(RMIContext.java:134)
at com.evermind.client.orion.Oc4jAdminConsole.executeCommand(Oc4jAdminCo
nsole.java:102)
at com.evermind.client.orion.Oc4jAdminConsole.main(Oc4jAdminConsole.java
:27)
Any suggestions to fix this error?
Thanks in advance for any help.

George,
The Readme.html file is available with the ejbqlsample.jar downloadable (Extract and find the doc in Ejbql\docs\Readme.html) which is printable.
Or,
If you are trying to print the file directly from OTN site, you need to set the Page-Setup Orientation to 'Landscape'.
Hope this helps.
Regards
Pushkala

RMI Beginner question.

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