Few Java EE questions

Hey guys
I am writing my first EE application and running into a few problems and would appreciate any help i can get
overview
At the moment the application consists of an enterprise module and a windows client application.
Web module will be done later
SQL server 2005 is the database being used
using netbeans IDE using the bundled application server 9 at the moment
so far i just have a entity class for one of the tables in my database with a stateless session bean to act as a communication bridge from the windows client to the entity.
The entity module is built and deployed on the server
The goal is to run the application client from a remote computer and not from deployin it to the application server as the Netbeans IDE does if u click run project, so for my testing i go to the jar file on the computer directly and run it from there
my client application has a main class and a JFrame class for the gui part for initial testing. Here are the problems
First scenario
if i inject a enterprise resource in the main file (right clicking ..popup menu way) it injects the annotation @EJB and the bean instance variable as expected, however it does not seem to modify the application-client.xml file. This all seems good but when i try to use that reference and call any of my bean functions, the run fails both directly and through the application server, but seems to run in debug mode for some reason. ???
second scenario
instead of injecting the resource in the main file, i inject it in my frame class and instead of the @ejb annotation i get a private function which gets teh initial context for the session bean and looks it up explictly. It also modifies the application-client.xml file and adds the following
<ejb-ref>
<ejb-ref-name>ejb/CustomerBean</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<remote>mypackage.stateless.session.CustomerRemote</remote>
</ejb-ref>
ok, so i use this remote object and call my function, it seems to run from the application server now, but now when i run it directly from my computer my GUI never materializes, i mean i see teh exe running in the task manager but nothing shows up., but the gui works fine when i run it from the application server. doenst make sense to me?? what am i missing here??
Why do the two scenarios occur, i.e why annotation for one and not for the other and why does the first one not even run in application server unless in debug mode. In the first scenario, do i need to add the stuff in the xml file manually? why cant i run the second scenario directly from the PC
If i cant run this application client remotely then there is no use, I created teh client with the check option to create it when i created the enterprise application, Do i need to create a normal client application that is not bundled with the enterprise app for it to work, my understanding is that bundling it makes it easier as it lets u inject resourses and still lets u run remotely. Any help will be greatly appreciated
On a side note, has anyone had any problems using sql schema with their applications, When i create an entity using databases , i only see my dbo schema, even though i have four schemas in my database. Even in runtime if i make a connection if only shows dbo unless i go to the property editor and manually change it, in which case it seems to take it but that way i am restricted to one schema. Any one has any link or code for a step by step of using MS Sql 2005 with EE? I basically am goin on trial an error on that one as i couldnt find any solid examples of this, Most examples of setting up databases using the application server 9 and using EE application use the bundled db, but i figured it would be similar. maybe i am missing some important step.

What specific error are you getting when it doesn't run? Is there any stack trace? Also, are you
using the "appclient" command to run the Application Client? If your server is running on a different
machine than the client, make a copy of the domains/domain1/config/sun-acc.xml file and edit the
target-server name property. Then reference that edited .xml file using the -xml option when executing
the appclien command.

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aphxps wrote:
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is it possible to make a database using only java like replicate mysql just using javaReplicate MySQL exactly? Or just write pure Java databases?
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I think I can help you with a few points:
2
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byte b = (byte)i;
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This kinda answers part e. too.
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For example 1a is simply a box with two other boxes beneath with arrows pointing upwards to the base class (not downwards as would seem reasonable).
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CBS Request Log
    ===== Processing ===== started at 2009-04-08 15:53:19.110 GMT
        BUILD DCs
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    ===== Post-Processing =====
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    ===== Post-Processing ===== started at 2009-04-08 15:54:15.968 GMT
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I have done some more testing regarding the case with "Database Error:Cannot store binary."
Unfortunately, the behaviour doesn't seem to be consitent or related to particular files. I had a successful activation with 79 of the files in one folder, but could'n add one single file in a new activity. When i removed one of the 79 files and added another file, one of those not possible to add before, it was successful.
After this I tried to remove all 79 files again i one activity, and the add the original 79 files in another. The remove was successful while the adding was unsuccessful. All with the same error message in Request log.
Does anybody have an idea of what is happening here? I don't have a clue.
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Plzzz write prog to this simple java threads question

Write a program in C to create four processes. The original processes creates
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Simple Java Coding Question

I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
a[--i] and a[++j] mean.
My first thought was that they meant to look at the position in the array one less (or more) than i (j). But that doesn't seem to be the case. A is an array of Strings, if that matters...
Thanks for you help.

muiajc wrote:
I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
a[--i] and a[++j] mean.
It mean increase/decrease the int i/j by 1. This is done before it gets you the value of a[]. for example if i=5 and you said a[--i] it is really a[4] and i is now equal to 4;

Simple Java EJB question.

When it comes to EJB v3 Remote and Local interfaces,
(With JBoss EJB Container Software in mind, for this question,)
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Edited by: Zac1234 on Jul 21, 2010 5:21 PM

muiajc wrote:
I know this is a simple question, but I can't search for the answer to this because it involves syntax that Google and the like don't seem to search for..
I am trying to figure out some Java code that I have found. I would like to know what:
a[--i] and a[++j] mean.
It mean increase/decrease the int i/j by 1. This is done before it gets you the value of a[]. for example if i=5 and you said a[--i] it is really a[4] and i is now equal to 4;

Simple Java Sound Question...

Can I draw waveforms while capturing data? If yes, how. If no, why.
Thanks. I need the answer ASAP, please help.

Hi nfactorial,
Can I draw waveforms while capturing data?If you would like to do that in Java you would need to know about how to use the Java language in general and especially about the Java Sound and Java2D APIs.
If yes, how.It would be too much to explain to answer such a general question. A general answer is, you need to use the Java Sound API to capture the data for which a waveform should be drawn. The Sound API delivers data as a stream of bytes typically encoded in pulse coded modulation (PCM) format. The data stream has digital samples each representing a level of sound pressure for a certain point in time. The stream of samples in the amplitude/time domain need to be transformed to a spectrum of samples in the amplitude/frequency domain, i.e. a number of PCM samples need to be mapped to the frequencies that should be displayed. This is done with the fast fourier transformation algorithm. Each set of amplitude/frequency values can then be displayed as a waveform by using some line drawing logic. The entire process would need to run constantly, i.e. as bytes are received from the sound data stream transformation and drawing is triggered.
Related readings:
Java Tutorial
http://java.sun.com/docs/books/tutorial/
Java Sound Documentation
http://java.sun.com/j2se/1.5.0/docs/guide/sound/index.html
Java Sound API Programmer's Guide
http://java.sun.com/j2se/1.5.0/docs/guide/sound/programmer_guide/contents.html
Java Sound Resources
http.//www.jsresources.org
Java 2D Graphics Tutorial
http://java.sun.com/docs/books/tutorial/2d/index.html
Wikipedia on fast fourier transformation
http://en.wikipedia.org/wiki/Fast_fourier_transform
HTH
Ulrich

Simple java pgm - question

Hallo,
to the following pgm I had question:
static void printPrimes (int max) (= wavy bracket;
boolean(should be angular brackets) sieve = new booolean (angular br max+1
angular br)
int i,j;
for (i=2; i = max;i++)sieve(angluarbr i angular br)= true
i= 2
while (i= <= max;) (=wavy bracket Out.println (i+ " "); // is prime
for (j=i; j <= j+i) sieve(angular br j angularb.) = false;
while (i <= maxAmpersandAmpersand !sieve (angular br angular br)I++;
) wavy br ) wavy br.
I hope this is still kind of readable.
Q's are:
after the first "for" there is a new i=2, which seems to staty at 2 all the time; the following while does not change this value ( the beginning for i++ does not change this) and so seems to print 2 at all times (??)
then the inner loop seems to count up all the doubbles of the new prime number and thrwoes it out as false at the end of it;
the i values (increased with i++ seemsto refere at all times to the unit numbers and only indirect to the un it values, which are written/ assigned to it (??)
I seem to wonder how the pgm can print out anythings else the 2's.
I would appreciate any help to that.
ml
griz

I hope this is still kind of readable.No, it's not. http://forum.java.sun.com/help.jspa?sec=formatting
Why are you omitting the braces and brackets? And why don't you type "program"? Aren't we worth the additional time it takes?
Q's are:
after the first "for" there is a new i=2, which
seems to staty at 2 all the time; the following
while does not change this value Why should it? You don't tell it to.
( the beginning for
i++ does not change this)It does. It just gets re-set to 2 after the for loop-
and so seems to print 2 at
all times (??)Yeah. What else?
then the inner loop seems to count up all the
doubbles of the new prime number and thrwoes it out
as false at the end of it; That part is definitely unreadable.

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Hi All, After some research I took the plunge and acquired a new NMH405 (I really would have liked the non existing "NMH400" i.e. no drives). I removed the 500GB drive and added two new 1.5TB WD Green Caviar Drives and set it up as Raid-1 After a few error messages and waiting for a very long time while the drives resynched I manage to get it online as z-drive to my vista system.  I played around with the built-in backup tool (I like it!). I tried the builtin player after having placed some of my iTunes albums on the media hub and decided that I did not really like that option to much. I then simply moved my itunes libraries to the MediaHub and used the iTunes application on Vista as a front end. That works very nice.
I have a few questions, probably showing my limited knowledge of network attached drives.
Q1. Are there any other way to power off the device than pressing the little bottom on the NMH405 (aka my NMH415!)? When powered off I assume the only other way to power it on is via the bottom again?
Q2. I have noticed the device is offline for ages after having either recycled Windows Vista or the hub itself. Why is that? And what can I do to bring it online in a orderly fashion? There must be a way to get that ugly red crossed NAS showing as green and online as a z-drive in "My Computer" a lot faster.
Q3. I reformatted the 500GB drive that the box came with, added it to Disk enclosure box and attached the USB to the front of the NMH405, after a while it said on the front panel that it had detected the drive and asker whether I wanted to import the content.  I declined that (partly because it was empty!). Now how do I access this drive? I would like to (occasionally) use it to back up files from my Raid-1 setup (you newer know what could happen there...). How do I use this USB attached drive? Also i noticed it did not show up in "My Computer" - actually "Computer" in windows? Adding it directly to my windows system it is detected instantly?
Thanks for any pointers or answers to enhance my user experience. I am still learning here.
best regards
Solved!
Go to Solution.

Q1. Your correct, there's only one button at the front for powering on/off. There is though an option to reboot the device inside the web interface thru the configuration > system option.
Q2. It really depends on how fast your network can establish a connection, a mapped network drive is fine but I noticed that it slows down the bootup or login process when you turn on the PC. What I did was just create a shortcut on the desktop (location \\nmh410\media) which points to my mediahub and did not map the mediahub anymore to drive z.
Q3. If its a fresh 500gb drive with nothin on it yet, then you would need to create a partition on it first by connecting the external USB drive directly to the PC. Check out this article from Microsoft about partitioning. I think an external USB drive icon will not show up on the PC since the external USB drive is plugged in onto the mediahub USB port. To gain access to that external USB drive which is plugged in onto the mediahub USB port, I just create a shortcut to \\nmh410\media\device . For backup you can use the NTI backup software that came with your mediahub.
Cheers.
Message Edited by Wilkins377 on 12-11-2009 09:38 AM

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