Getting information about LV Class data
Is there a way to determine what data is present inside a class definition? I'd like to do something similar to how you can iterate through items in a cluster by using a reference, but do this in a generic way that takes in to account the dynamic, inheritable nature of the LV Class. Ideally I'd like a VI that took a base LabVIEW Object and returned the available fields and data types present. I tried doing this using flatten-to-XML, but for a class constant, the XML contains no useful information.
Bringo! I found this: https://decibel.ni.com/content/docs/DOC-23394
Similar Messages
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How can i get more info about the sent data in RTP?
Hello.
I'm working with the examples AVTransmitt2 and AV Receive2 and i want to get more information about the data that it is being sent to de receiver side. In AVTrasmitt2 i only see a calling to processor.start();. How could i know each packet that AvTransmit2 sends to the other side. I want info like the size of the data, the quality, format, etc..Hi!
As I mentioned above. RTPSocketAdapter has two inner classes, SockOutputStream and SockInputStream.
SockOutputStream have a write method which is called when RTP data is sent over the NET. SockInputStream have a read method which is called when RTP data is received.
If you for instance want to know exactly what is sent you can parse the byte array that comes into write.
Like this:
* An inner class to implement an OutputDataStream based on UDP sockets.
class SockOutputStream implements OutputDataStream {
DatagramSocket sock;
InetAddress addr;
int port;
boolean isRTCP;
public SockOutputStream(DatagramSocket sock, InetAddress addr, int port, boolean isRTCP) {
this.sock = sock;
this.addr = addr;
this.port = port;
public int write(byte data[], int offset, int len) {
if(isRTCP){
parseAndPrintRTCPData(data);
}else{
parseAndPrintRTPData(data);
try {
sock.send(new DatagramPacket(data, offset, len, addr, port));
} catch (Exception e) {
return -1;
if(debug){
System.out.println(debugName+": written "+len+" bytes to address:port: "+addr+":"+port);
return len;
private void parseAndPrintRTPData(byte[] data) {
// part of header, there still left SSRC and CSRC:s
byte[] rtpHeader = new byte[8];
System.arraycopy(data, 0, rtpHeader, 0, rtpHeader.length);
ByteBuffer buffer = ByteBuffer.wrap(rtpHeader);
int word = buffer.getInt();
// version
int v = word >>> 30;
System.out.println("version: "+v);
// padding
int p = (word & 0x20000000) >>> 29;
System.out.println("padding: "+p);
// extension
int x = (word & 0x10000000) >>> 28;
System.out.println("extension: "+x);
// CSRC count
int cc = (word & 0x0F000000) >>> 24;
System.out.println("CSRC: "+cc);
// marker
int m = (word & 0x00800000) >>> 23;
System.out.println("marker: "+m);
// payload type
int pt = (word & 0x00700000) >>> 16;
System.out.println("payload type: "+pt);
// sequence number
int seqNbr = (word & 0x0000FFFF);
System.out.println("sequence number: "+seqNbr);
// timestamp
int timestamp = buffer.getInt();
System.out.println("timestamp: "+timestamp);
private void parseAndPrintRTCPData(byte[] data) {
// this only works when the RTCP packet is a Sender report (SR).
// All RTCP packets are compound packets with a SR or Receiver report (RR) packet first.
// part of header, there is still the report blocks (see RFC 3550).
byte[] rtcpHeader = new byte[28];
System.arraycopy(data, 0, rtcpHeader, 0, rtcpHeader.length);
ByteBuffer buffer = ByteBuffer.wrap(rtcpHeader);
int word = buffer.getInt();
// version
int v = word >>> 30;
System.out.println("version: "+v);
// padding
int p = (word & 0x20000000) >>> 29;
System.out.println("padding: "+p);
// reception report count
int rc = (word & 0x0F000000) >>> 24;
System.out.println("reception report count: "+rc);
// payload type, which is 200 in this case (SR=200)
int pt = (0x00FF0000 & word) >>> 16;
System.out.println("payload type: "+pt);
// length
int length = (word & 0x0000FFFF);
System.out.println("length: "+length);
// SSRC of sender
int ssrc = buffer.getInt();
System.out.println("SSRC: "+ssrc);
// NTP timestamp
long ntp_timestamp = buffer.getLong();
System.out.println("NTP timestamp: "+ntp_timestamp);
// RTP timestamp
int rtp_timestamp = buffer.getInt();
System.out.println("RTP timestamp: "+rtp_timestamp);
// sender's packet count
int nbrOfSentPackets = buffer.getInt();
System.out.println("sender's packet count: "+nbrOfSentPackets);
// sender's octet count
int nbrOfSentBytes = buffer.getInt();
System.out.println("sender's octet count: "+nbrOfSentBytes);
}I added a boolean isRTCP to the constructor so to know what sort of data is sent.
Hope this clarifies things. -
ITunes 10.5.3, Unable to Load Class Data from Sync Services, Crashes Repeatedly
Ever since iTunes 10.5.3 on my Windows 7 x64 box, I've been having serious problems keeping iTunes running:
1) Any time I connect my iPhone or iPad, or any time they attempt to sync over WiFi, I get the 'Unable to load class data from sync services' error. It's worth mention that the iPhone or iPad do actually then proceed to sync correctly, and all media / data is synchronized successfully, as far as I've been able to tell. I've reset sync history, restored the iPhone and iPad, manually moved the SyncServices directory, set both the iPhone and iPad up as new, completely uninstalled iTunes and the mobile device software, re-installed, and *nothing* I do fixes this issue or even seems to impact it. Uninstalling iTunes 10.5.3 and reinstalling iTunes 10.5.2 resolves this error.
2) iTunes 10.5.3 has serious crashing problems on my machine, though I've searched through forums and found a lot of other people with the problem. In my case, sporadically as iTunes access the iTunes store (for example, I can always make it happen by subscribing to the Diggnation podcast and telling it to refresh the podcast), I get a full application crash which generates the following event in the event log:
Faulting application name: iTunes.exe, version: 10.5.3.3, time stamp: 0x4f14cc3d
Faulting module name: KERNELBASE.dll, version: 6.1.7601.17651, time stamp: 0x4e211319
Exception code: 0x80000003
Fault offset: 0x0001280c
Faulting process id: 0x564
Faulting application start time: 0x01cce78789dc009a
Faulting application path: D:\Program Files (x86)\iTunes\iTunes.exe
Faulting module path: C:\Windows\syswow64\KERNELBASE.dll
Report Id: ecc77400-537a-11e1-b809-00248c196007
Again, uninstalling iTunes 10.5.3 and re-installing iTunes 10.5.2 fixes this issue as well, but I really shouldn't have to do that. Is there any actual solution to these problems other than dowgrading to an older version?
Yes, I'm running current malware protection (and my system is clean) and yes, I've already checked any other obvious culprits to make sure I don't just have a corrupt library or file somewhere that's causing it. My Windows 7 install is completely up to date from a Windows Update perspective and also from a driver perspective (even including the motherboard and chipset drivers). I made sure to do a system file integrity check (sfc /scannow) and it confirmed my install of Windows isn't suspect, but beyond all that I was able to reproduce these failures on a completely separate machine running Windows 7 x64, without any of my media library or data on it -- iTunes 10.5.3 just seems to be bad news on Windows 7 x64 for me, even though I know there are definitely people are using it successfully. I don't get any other application crashes for any other applications, and I've never had an issue like this with any previous version of iTunes...
Last but not least, in case it matters, I'm running iOS 5.0.1 on both the iPhone4 and the iPad2. The iPhone4 is the GSM AT&T model and the iPad2 is the CDMA Verizon model.OK, I've given up. Uninstalled iTunes 10.5.3 permanently. It's a shame, 10.5.2 works perfectly but 10.5.3 is a complete and total cluster for me.
Anyone with the same problems who hasn't done this already, just uninstall iTunes and the Apple Mobile Device Service in your Add/Remove Programs, then re-install iTunes 10.5.2. You won't lose your library or any settings or apps, it will just go back to working again.
I wish Apple would acknowledge this so that I'd at least know it would be fixed in the future. -
How get controls name from a class private data?
How can i get the names of the controls inside a class private data?
I am using Actor Framework and trying to create a method tha will be executed when launch the actor. This method need a list o all the control names inside the class data to search for the initial value inside a configuration file (config.ini), the key on the configuration file will be the name of the control.
Thanks.
Solved!
Go to Solution.You are already making the overriding method just because you have to write to the Bundle By Name. And then how are you going to handle all of the data types the keys could be. You are making things more difficult than it should be for really very little benefit.
There are only two ways to tell somebody thanks: Kudos and Marked Solutions
Unofficial Forum Rules and Guidelines -
I get the error "unable to load data class info from sync services" and eventully itunes freezes. will this article help me?
Hello there brigidfromca.
Messages can always be pretty daunting when we're not sure where to start. I was able to locate the following Knowledge Base article that discusses the very message you're getting:
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert
http://support.apple.com/kb/TS2690
It is a pretty thorough document with multiple steps to review, but looks to be great place to start for a resolution for you.
Thanks for using Apple Support Communities to reach out to us for answers.
Cheers,
Pedro D. -
I have an apple tv about two years old. Bought for a present and they never took it. I tried to hook it up cut it get stuck on setting time and date. Any help?
If you can view the main home screen, try selecting "settings" on the far right, then choose recent at the bottom. If not, try just unplugging power for a few minutes, then plug in and try again. Keep in mind you'll need a wireless connection and there may be several updates. Hope this helps-
-
I want to know memory manament and data display algorithm in LabViEW.Where can I get some materials about them? I need them to complete my essay .Thank you for your help.
Memory menagement:
http://zone.ni.com/devzone/conceptd.nsf/2d17d611efb58b22862567a9006ffe76/732cec772aa4fbe586256a37005541d3?OpenDocument
About data display: what type of data you wat display? -
Cannot reslove symbol class Date
I am trying to get a clock to show the time in my program. However, when I try to compile the program a "cannot resolve symbol class Date" error appears. I can't figure out where the problem in my program is. Here is my source code. I would appreciate any help.
import javax.swing.*;
import java.io.*;
import java.lang.*;
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
//import java.util.*;
import java.math.*;
public class store
public static void main(String[] args)
String dataInput;
dataInput = JOptionPane.showInputDialog(null, "Input item data: ");
JOptionPane.showMessageDialog(null, "" + dataInput);
EasyReader console = new EasyReader();
int i, j, k, inum, icom, min, nswaps; inum = 0; boolean swap = false;
double num[] = new double[100]; double dsum, T;
do
System.out.println(); System.out.println("Command Menu"); System.out.println();
System.out.println("1 = Display the data");
System.out.println("2 = Bubble Sort the numbers");
System.out.println("3 = Selection Sort the numbers");
System.out.println("4 = Insertion Sort the numbers");
System.out.println("5 = Binary Search for a number");
System.out.println("0 = Exit the program"); System.out.println();
System.out.print("Enter Command - ");
icom = console.readInt(); System.out.println();
switch (icom)
case 1: // Display the data
Display(inum, num);
break;
case 2: // Bubble sort
nswaps = 0;
for (i = 0; i < (inum-1); i++ )
for (j = (i+1); j < inum; j++)
if (num[i] > num[j])
T = num;
num[i] = num[j];
num[j] = T;
nswaps++;
System.out.println("The number of swaps was - " + nswaps);
Display(inum, num);
break;
case 3: // Selection sort
nswaps = 0;
for (i = 0; i < inum - 1; i++) {
min = i; swap = false;
for (j = i + 1; j < inum; j++)
if (num[j] < num[min]) { min = j; swap = true; }
if (swap) {T = num[min];
num[min] = num[i];
num[i] = T;
nswaps++;}
System.out.println("The number of swaps was - " + nswaps);
Display(inum, num);
break;
case 4: // Selection sort
nswaps = 0;
for (i = 1; i < inum; i++)
j = i; T = num[i];
while ((j > 0) && (T < num[j-1]))
num[j] = num[j-1]; j--; nswaps++;
num[j] = T; nswaps++;
System.out.println("The number of swaps was - " + nswaps);
Display(inum, num);
break;
case 5: // Binary Search
System.out.println("Your numbers will be sorted first");
System.out.println();
for (i = 1; i < inum; i++)
j = i; T = num[i];
while ((j > 0) && (T < num[j-1]))
num[j] = num[j-1]; j--;
num[j] = T;
System.out.print("Enter the number to locate - ");
T = console.readDouble(); nswaps = 0; System.out.println();
int left = 0, right = inum, middle; k = -1;
while (left <= right)
middle = (left + right) / 2;
if (T > num[middle]) {left = middle + 1; nswaps++;}
else if (T < num[middle]) {right = middle - 1; nswaps++;}
else { k = middle; break; }
if (k == -1) System.out.println("Your number was not located in the array");
else System.out.println("Your number " + T + " is in position " + (k+1));
System.out.println();
System.out.println(nswaps + " comparisons were needed to search for your number");
Display(inum, num);
break;
} while (icom != 0);
public static void Display(int inum, double num[])
{ int k;
System.out.println();
System.out.println("");
System.out.println();
for (k = 0; k < inum; k++)
System.out.println((k+1) + " - " + num[k]);
return;
class Clock extends Thread
//A Canvas that will display the current time on the calculator
Canvas Time;
//A Date object that will access the current time
private Date now;
//A string to hold the current time
private String currentTime;
//The constructor for Clock, accepting a Label as an argument
public Clock(Canvas _Time)
Time = Time; //Time is passed by reference, so Time
//now refers to the same Canvas
start(); //start this thread
//The overriden run method of this thread
public void run()
//while this thread exists
while (true)
try
draw_clock(); //calls the draw_clock method
sleep(1000); //puts this thread to sleep for one
//second
//catches an InterruptedException that the sleep() method might throw
catch (InterruptedException e) { suspend(); }
//catches a NullPointerException and suspends the thread if one occurs
catch (NullPointerException e) { suspend(); }
//A method to draw the current time onto the Time Canvas on the applet
public void draw_clock()
try
//Obtains the Graphics object from the Canvas Time so that it can
//be manipulated directly
Graphics g = Time.getGraphics();
g.setColor(Color.gray); //sets the color of the Graphics object
//to gray for the rectangle background
g.fillRect(0,0,165,25); //fills the Canvas area with a rectangle
//starting at 0,0 coordinates of the Canvas
//and extending to the length and width
g.setColor(Color.orange); //sets the color of the Graphics object
//to orange for the text color
get_the_time(); //calls the get_the_time() method
//calls the drawString method of the Graphics object g, which will
//draw a string to the screen
//Accepts a string and two integers to represent the coordinates
g.drawString("Current Time - " + currentTime, 0, 17);
//catches a NullPointerException and suspends the thread if one occurs
catch (NullPointerException e) { suspend(); }
//A method to obtain the current time, accurate to the second
public void get_the_time()
//creates a new Date object for "now" every time this is called
now = new Date( );
//integers to hold the hours, minutes and seconds of the current time
int a = now.getHours();
int b = now.getMinutes();
int c = now.getSeconds();
if (a == 0) a = 12; //if hours are zero, set them to twelve
if (a > 12) a = a -12; //if hours are greater than twelve, make a
//conversion to civilian time, as opposed to
//24-hour time
if ( a < 10) //if hours are less than 10
//sets the currentTime string to 0, appends a's value and a
//colon
currentTime = "0" + a + ":" ;
else
//otherwise set currentTime string to "a", append a colon
currentTime = a +":";
if (b < 10) //if minutes are less than ten
//append a zero to string currentTime, then append "b" and a colon
currentTime = currentTime + "0" + b + ":" ;
else
//otherwise append "b" and a colon to currentTime string
currentTime = currentTime + b + ":" ;
if (c < 10) //if seconds are less than ten
//append a zero to string currentTime, then append "c" and a colon
currentTime = currentTime + "0" + c ;
else
//otherwise append "c" to currentTime string
currentTime = currentTime + c;
} //end of the Clock classWow.
1) Please in future use the code tags to format code you post so that it doesn't think you have italics in your code and render it largely1 unreadable. Read this
http://forum.java.sun.com/help.jspa?sec=formatting
2) You commented out the import of java.util which is the problem you are complaining about.
3) Are you planning to stick all the code you ever write into the one source file? Why is all this stuff rammed together. Yoinks. -
I am using the Order Analysis Toolkit and want to get more information about the compensation for "Reference Signal Processing", which is scarce in the manuals, the website and the examples installed with the toolkit.
In particular, I am analyzing the example "Even Angle Reference Signal Processing (Digital Tacho, DAQmx).vi", whose documentation I am reproducing in the following:
<B>DESCRIPTIONS</B>:
This VI demonstrates how to extract even angle reference signals and remove the slow-roll errors. It uses DAQmx VIs to acquire sound or vibration signals and a digital tachometer signal. This VI includes a two-step process: acquire data at low rotational speed to extract even angle reference; use the even angle reference to remove the errors in the vibration signal acquired at normal operation.
<B>INSTRUCTIONS</B>:
1. Run the VI.
2. On the <B>DAQ Configurations</B> tab, specify the <B>sample rate</B>, <B>samples per channel</B>, device and channel configurations, and tachometer channel information.
<B>NOTE</B>: You need to use DSA PXI-447x/PXI-446x and PXI TIO device in a PXI chassis to run this example. The DSA device must be in slot 2 of the PXI chassis.
3. Switch to <B>Extract Even Angle Reference</B> tab. Specify the <B>number of samples to acquire</B> and the <B># of revs in reference</B> which determines the number of samples in even angle reference. Click <B>Start</B> to take a one-shot data acquisition of the vibration and tachometer signals. After the acquisition, you can see the extracted even angle references in <B>Even Angle Reference</B>.
4. Switch to the <B>Remove Slow-roll Errors</B> tab. Click <B>Start</B> to acquire data continuously and view the compensate results. Click <B>Stop</B> in this tab to stop the acquisition.
<B>ORDER ANALYSIS VIs USED IN THIS EXAMPLE</B>:
1. SVL Scale Voltage to EU.vi
2. OAT Digital Tacho Process.vi
3. OAT Get Even Angle Reference.vi
4. OAT Convert to Even Angle Signal.vi
5. OAT Compensate Even Angle Signal.vi
My question is: How is the synchronization produced at the time of the compensation ? How is it possible to eliminate the errors in a synchronized fashion with respect to the surface of the shaft bearing in mind that I am acquired data at a low rotation speed in order to get the "even angle reference" and then I use it to remove the errors in the vibration signal acquired at normal operation. In this application both operations are made in different acquisitions, therefore the reference of the correction signal is lost. Is it simply compensated without synchronizing ?
Our application is based on FPGA and we need to clarity those aspects before implementing the procedure.
Solved!
Go to Solution.Hi CracKatoA.
Take a look at the link bellow:
http://forums.ni.com/ni/board/message?board.id=170&message.id=255126&requireLogin=False
Regards,
Filipe Silva -
How can I get a dynamic list of Classes Loaded
I assume this may need to use some sort of reflection. Does
anyone have code or ideas where I can:
a) I can get a list of all Classes loaded and their
properties. This would probably be all instances of Class
b) A list of all
global instance variables. (This may not even be possible. I
know it can be done in other languages)
I assume this may need to use some sort of reflection.
Thank youAdobe Newsbot hopes that the following resources helps you.
NewsBot is experimental and any feedback (reply to this post) on
its utility will be appreciated:
mx.controls.List (Flex 3):
If the data is incorrect, you can call the preventDefault()
method to stop Flex from passing the new data back to the list
control and from closing the
Link:
http://livedocs.adobe.com/flex/3/langref/mx/controls/List.html
Displaying icons in a Flex List control at Flex Examples:
http://blog.flexexamples.com/2007/08/17/displaying-icons-in-a-flex-list-control/
--> <mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
Link:
http://blog.flexexamples.com/2007/08/17/displaying-icons-in-a-flex-list-control/
Populate the list -- Flex 2.01:
You populate a list-based form control with the
<mx:dataProvider> child tag. The <mx:dataProvider> tag
lets you specify list items in several ways.
Link:
http://livedocs.adobe.com/flex/201/html/tutorial_controls_019_4.html
Smooth Scroll for Horizontal List - Flex India Community |
Google:
I have created image gallery with Horizontal List[Flex 2.0].
Just as below ref site. My Problem is i need a smooth scroll for
Horizontal List. where images
Link:
http://groups.google.com/group/flex_india/browse_thread/thread/a12441143b98d32c?hide_quote s=no
Creating a List control -- Flex 2.01:
The following example code adds a handler for a change event
to the List control. Flex broadcasts a mx.ListEvent.CHANGE event
when the value of the control
Link:
http://livedocs.adobe.com/flex/201/html/dpcontrols_062_03.html
Disclaimer: This response is generated automatically by the
Adobe NewsBot based on Adobe
Community
Engine. -
"iTunes was unable to load class data information from sync services"
I own iTunes 10.5 beta 3 64-bit for my 64-bit windows 7 pc, and it gives me this message whenever I try to sync ANY of my devices: "iTunes was unable to load class data information from Sync Services". I own an old iPod video and an iPhone 4 with iOS 5 beta 3. I've tried uninstalling all Apple products, searching through my hard drive and deleting everything Apple, cleaning the registry, EVERYTHING. I've reinstalled at least 4 times now. The problem refuses to become fixed. I've searched every article online possible, and none of the solutions have worked. Is there anything I can do to get my stuff back on to my devices???
In the course of your troubleshooting to date, have you worked through the following document?
iTunes for Windows: "Unable to load data class" or "Unable to load provider data" sync services alert -
How to get the name of a class invoking
Can a method get the name of the class invoking it?
As:
public void myMethod(){
System.out.println("the name of the class invoking this method is: " + XXXXX);
}Edited by: Maria1990 on Aug 17, 2010 8:46 AMMaria1990 wrote:
.getStackTrace() gives me an array with the all details.Or, if you only care about the class, ask a SecurityManager.
public final class ClassUtils {
public static final Class[] getClassContext() {
return new SecurityManager() {
protected Class[] getClassContext(){return super.getClassContext();}
}.getClassContext();
private ClassUtils() {};
public static final Class getCallingClass() { return getClassContext()[2];}
} -
Class-data versus data and methods versus class-methods in OO ABAP
Hi
I was going thorugh following OO ABAP code.
CLASS vessel DEFINITION.
PUBLIC SECTION.
METHODS: constructor,
drive IMPORTING speed_up TYPE i,
get_id RETURNING value(id) TYPE i.
CLASS-METHODS: start,
objects,
inheritance,
interfaces,
events.
PROTECTED SECTION.
DATA: speed TYPE i,
max_speed TYPE i VALUE 100.
PRIVATE SECTION.
CLASS-DATA object_count TYPE i.
DATA id TYPE i.
ENDCLASS.
Whats is difference between methods and class-methods ?
What is the difference between data and class-data ?Hi Rajesh,
There are two types of componenets in a class
1)Static components
2) Instance components
Instance components exist for every instance of the class, while static exist only once for any number of instances of the class.
Components of the class are methods, attributes, events etc.
static attributes are represented by CLASS-DATA and instance attributes are represented by DATA.
static methods hence are done by CLASS-METHODS and can access only static attributes.
Instance methods are done by METHODS and can access any attribute.
For eg: supposing that in a class, there is a static attribute. Suppose after one instance is created, we are setting this static attribute value as 10. Now we are creating another instance of the same class. Now when you try to display the value of this attribute, it will be 10.ie. it needs to be initialized once and can be shared between instances.
Just go through this document..You will get nice info from this.
http://esnips.com/doc/5c65b0dd-eddf-4512-8e32-ecd26735f0f2/prefinalppt.ppt
http://esnips.com/doc/2c76dc57-e74a-4539-a20e-29383317e804/OO-abap.pdf
If you want to go deeper, like object persistence and all, just refer this document.
http://esnips.com/doc/92be4457-1b6e-4061-92e5-8e4b3a6e3239/Object-Oriented-ABAP.ppt
Regards,
SP. -
To ragnic and other about Singleton class
Hi ragnic. Thanks for your reply. I posted the code wrong. Heres' my correct one.
I have a GUI first loaded information and the information is stored in a databse, I have some EJB classes..and my singleton class ABC has some method to access to the EJB..
so my first GUI will gather info using singleton class and later if I click on
a button in my first GUI class, will pop up another frame of another class , this class also need to class setPassword in my Singleton..
are my followign codes correctly??
iS my Class ABC a SINgleton class? thanks
Is my class ABC use as single correctly. And It is called from other classes is also correct?
I'm new to java and like to learn about Singleton class.
But I really dont' understand it clearly after reading many examples of it.
I have a project to convert my class abc to a singleton.
But I dont know how to do it.
In my class(soon will become a singleton) will have few methods that later I need to use it from another class A and class B.
I have a GUI application that first load my class A..and my class will call
class abc(singleton) to get some information from it.
and then in class A has a button, if I click on that button I will call SIngleton class again to update my password, in the singleton class has method calls updatePassword. But I dont know how to call a singleton from other class.
I have my code for them below:
1)public class ABC //attempt using a singleton
private static ABC theABC = null;
private ABC(){}
public synchronized static ABC getABC()
if(theABC == null)
theABC= new ABC();
return the ABC;
public void updateUserInfo(SimpleUser user)
throws UserNotFoundException, DelegateException
try
UserCollectionHome userCollectionHome = (UserCollectionHome)
EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
UserCollectionHome.class);
UserHome userHome = (UserHome)
EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
UserCollection uc = userCollectionHome.create();
uc.updateUserInfo(user, userHome);
} catch(HomeFactoryException hfe) {
hfe.printStackTrace();
throw new DelegateException(hfe);
} catch(RemoteException re) {
re.printStackTrace();
throw new DelegateException(re);
} catch(CreateException ce) {
ce.printStackTrace();
throw new DelegateException(ce);
} catch(FinderException fe) {
fe.printStackTrace();
throw new UserNotFoundException();
public SimpleUser getID(String id)
throws UserNotFoundException, DelegateException
try
UserCollectionHome userCollectionHome = (UserCollectionHome)
EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
UserCollectionHome.class);
UserHome userHome = (UserHome)
EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
UserCollection uc = userCollectionHome.create();
SimpleUser su = uc.getID(id, userHome);
return su;
} catch(HomeFactoryException hfe) {
throw new DelegateException(hfe);
} catch(RemoteException re) {
throw new DelegateException(re);
} catch(CreateException ce) {
throw new DelegateException(ce);
} catch(FinderException fe) {
throw new UserNotFoundException();
public void setPassword(String lname,String pw)
throws UserNotFoundException, DelegateException
try
UserCollectionHome userCollectionHome = (UserCollectionHome)
EJBHomeFactory.getFactory().lookupHome("vista/UserCollection",
UserCollectionHome.class);
UserHome userHome = (UserHome)
EJBHomeFactory.getFactory().lookupHome("vista/User",UserHome.class);
UserCollection uc = userCollectionHome.create();
uc.setPassword(lname,pw, userHome);//assume that all lname are differents.
} catch(HomeFactoryException hfe) {
hfe.printStackTrace();
throw new DelegateException(hfe);
} catch(RemoteException re) {
re.printStackTrace();
throw new DelegateException(re);
} catch(CreateException ce) {
ce.printStackTrace();
throw new DelegateException(ce);
} catch(FinderException fe) {
fe.printStackTrace();
throw new UserNotFoundException();
}//Do I have my class as a Singleton correctly???
2)//Here is my First Frame that will call a Singleton to gather user information
public A(Frame owner)
super(owner, "User Personal Information",true);
initScreen();
loadPersonalInfo();
* This method instantiates all the GUI widgets and places them into panels and
* onto the frame.
private void initScreen()
txtFname = new JTextField(20);
txtLname=new JTextField(20);
btnsave =new JButton("Save");
btnChange= new JButton("Click here to change PW");//when you click this button there will be a frame pop up for you to enter informaton..this iwll call class B
JPanel pnlMain=new JPanel();
JPanel pnlFname= new JPanel();
pnlFname.setLayout(new BoxLayout(pnlFname, BoxLayout.X_AXIS));
pnlFname.setBorder(BorderFactory.createEmptyBorder(0,87,0,90));
pnlFname.add(new JLabel("First Name:"));
pnlFname.add(Box.createRigidArea(new Dimension(5,0)));
pnlFname.add(txtFname);
JPanel pnlLname= new JPanel();
pnlLname.setLayout(new BoxLayout(pnlLname, BoxLayout.X_AXIS));
pnlLname.setBorder(BorderFactory.createEmptyBorder(0,87,0,90));
pnlLname.add(new JLabel("Last Name:"));
pnlLname.add(Box.createRigidArea(new Dimension(5,0)));
pnlLname.add(txtLname);
pnlMain.add(pnlFname);
pnlMain.add(pnlLname);
pnlMain.add(btnsave);
pnlMain.add(btnChange");
btnSave = new JButton("Save");
btnSave.setActionCommand("SAVE");
btnSave.addActionListener(this);
btnCancel = new JButton("Cancel");
btnCancel.setActionCommand("CANCEL");
btnCancel.addActionListener(this);
JPanel pnlBottom = new JPanel();
pnlBottom.setLayout(new BoxLayout(pnlBottom, BoxLayout.X_AXIS));
pnlBottom.setBorder(BorderFactory.createEmptyBorder(25,55,0,0));
pnlBottom.add(btnSave);
pnlBottom.add(Box.createRigidArea(new Dimension(25,0)));
pnlBottom.add(btnCancel);
pnlMain.add(pnlBottom);
this.setContentPane( pnlMain);
setSize(500,500);
GraphicUtilities.center(this);
theABC=ABC.getABC();
//Do I call my ABC singleton class correctly??
private void loadPersonalInfo()
String ID= System.getProperty("user.name");
SimpleUser user = null;
try {
user = ABC.getID(ID);
//I tried to use method in ABC singleton class. IS this correctly call?
} catch(UserNotFoundException nfe)
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered.",
"User Not Found",JOptionPane.WARNING_MESSAGE);
System.exit(0);
} catch(DelegateException de) {
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered",JOptionPane.ERROR_MESSAGE);
System.exit(0);
currentUser = user;
txtFname.setText(currentUser.getFirstName());
txtLname.setText(currentUser.getLastName());
//This information will be display in my textfields Fname and Lname
//I can change my first and last name and hit button SAVE to save
public void actionPerformed(ActionEvent e)
if(e.getActionCommand().equals("SAVE")) submitChanges();
if(e.getActionCommand().equals("CHANGE_PASSWORD")) {
changepassword=new ChangePassword(new Frame(),name,badgeid);
public void submitChanges(){
String currentNTUsername = System.getProperty("user.name");
SimpleUser user =null;
try {
user = theABC.getID(ID);
user.setFirstName(txtFname.getText().trim());
user.setLastName(txtLname.getText().trim());
currentUser = user;
theABC.updateUserInfo(currentUser);
//IS this correctly if I want to use this method in singleton class ABC??
} catch(UserNotFoundException nfe)
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered",
"User Not Found",JOptionPane.WARNING_MESSAGE);
} catch(DelegateException de) {
JOptionPane.showMessageDialog(new JDialog(),"You have not yet registered",JOptionPane.ERROR_MESSAGE);
System.exit(0);
this.setVisible(false);
3) click on ChangePassword in my above GUI class A..will call this class B..and in this class B
I need to access method in a Singleton class- ABC class,,DO i need to inititates it agian, if not what should I do? thanks
package com.lockheed.vista.userinfo;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import javax.swing.table.*;
import javax.swing.tree.*;
import java.util.StringTokenizer;
import java.util.Vector;
import java.io.*;
import javax.swing.text.*;
import javax.swing.text.html.*;
import javax.swing.colorchooser.*;
import javax.swing.filechooser.*;
import javax.accessibility.*;
import java.beans.*;
import java.applet.*;
import java.net.*;
import org.apache.log4j.*;
import com.lockheed.common.gui.GraphicUtilities;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import vista.user.UserServicesDelegate;
import vista.user.SimpleUser;
import vista.user.UserNotFoundException;
import vista.user.*;
import com.lockheed.common.ejb.*;
import com.lockheed.common.gui.*;
import com.lockheed.vista.publish.*;
* This program allow users to change their Vista Web Center's password
public class ChangePassword extends JDialog
implements ActionListener{
protected final Logger log = Logger.getLogger(getClass().getName());
private UserServicesDelegate userServicesDelegate;
private User currentUser = null;
private JPasswordField txtPasswd, txtVerifyPW;
private JButton btnSubmit,btnCancel;
private JLabel lblName,lblBadgeID;
private String strBadgeID="";
* This is the constructor. It creates an instance of the ChangePassword
* and calls the method to create and build the GUI.
public ChangePassword(Frame owner,String name,String badgeid)
super(owner, "Change Password",true);
initScreen(name,badgeid);//build the GUI
* This method instantiates all the GUI widgets and places them into panels and
* onto the frame.
private void initScreen(String strname,String strBadgeid)
txtPasswd = new JPasswordField(20);
txtVerifyPW=new JPasswordField(20);
txtPasswd.setEchoChar('*');
txtVerifyPW.setEchoChar('*');
JPanel pnlMain=new JPanel();
pnlMain.setLayout(new BoxLayout(pnlMain, BoxLayout.Y_AXIS));
pnlMain.setBorder(BorderFactory.createEmptyBorder(20,0,20,0));
JPanel pnlPW=new JPanel();
pnlPW.setLayout(new BoxLayout(pnlPW, BoxLayout.X_AXIS));
pnlPW.setBorder(BorderFactory.createEmptyBorder(0,96,0,30));
pnlPW.add(new JLabel("Password:"));
pnlPW.add(Box.createRigidArea(new Dimension(5,0)));
pnlPW.add(txtPasswd);
JPanel pnlVerifyPW=new JPanel();
pnlVerifyPW.setLayout(new BoxLayout(pnlVerifyPW, BoxLayout.X_AXIS));
pnlVerifyPW.setBorder(BorderFactory.createEmptyBorder(0,63,0,30));
pnlVerifyPW.add(new JLabel("Verify Password:"));
pnlVerifyPW.add(Box.createRigidArea(new Dimension(5,0)));
pnlVerifyPW.add(txtVerifyPW);
JPanel pnlTop= new JPanel();
pnlTop.add(pnlPW);
pnlTop.add(Box.createRigidArea(new Dimension(0,10)));
pnlTop.add(pnlVerifyPW);
pnlMain.add(pnlTop);
btnSubmit = new JButton("Submit");
btnSubmit.setActionCommand("SUBMIT");
btnSubmit.addActionListener(this);
btnCancel = new JButton("Cancel");
btnCancel.setActionCommand("CANCEL");
btnCancel.addActionListener(this);
JPanel pnlBottom = new JPanel();
pnlBottom.setLayout(new BoxLayout(pnlBottom, BoxLayout.X_AXIS));
pnlBottom.setBorder(BorderFactory.createEmptyBorder(25,55,20,30));
pnlBottom.add(btnSubmit);
pnlBottom.add(Box.createRigidArea(new Dimension(25,0)));
pnlBottom.add(btnCancel);
pnlMain.add(pnlBottom);
this.setContentPane( pnlMain);
setSize(350,230);
setVisible(true);
public void actionPerformed(ActionEvent e)
if(e.getActionCommand().equals("CANCEL")) this.setVisible(false);
if(e.getActionCommand().equals("SUBMIT")) submitPW();
* This method is called when the submit button is clicked. It allows user to change
* their password.
public void submitPW(){
myABC= ABC.getABC();//Is this correct?
char[] pw =txtPasswd.getPassword();
String strPasswd="";
for(int i=0;i<pw.length;i++){
strPasswd=strPasswd+pw;
char[] vpw =txtVerifyPW.getPassword();
String strVerifyPW="";
for(int i=0;i<vpw.length;i++){
strVerifyPW=strVerifyPW+pw;
if((strPasswd==null)||(strPasswd.length()==0)) {
JOptionPane.showMessageDialog(new JDialog(),"You have not enter a password. Please try again.",
"Invalid Password",JOptionPane.ERROR_MESSAGE);
if((!strPasswd.equals(strVerifyPW)))
//password and verify password do not match.
JOptionPane.showMessageDialog(new JDialog(),"Your passwords do not match. Reenter and try again.",
"Invalid Password",JOptionPane.ERROR_MESSAGE);
try
myABC.setUserPassword(strPasswd);//try to use a method in Singleton class
txtPasswd.setText("");
txtVerifyPW.setText("");
this.setVisible(false);
} catch(DelegateException e) {
JOptionPane.showMessageDialog(new Frame(),
"Error.",
"Unable to change password information.",JOptionPane.WARNING_MESSAGE);
} catch(UserNotFoundException e) {
JOptionPane.showMessageDialog(new Frame(),
"Error.",
"Unable to change password information.",JOptionPane.WARNING_MESSAGE);
And ofcourse I have other EJB classes to work with these classes.
***It compiles okey but when I ran, it say "NullPointerException"
I think I call my Singleton wrong.
Please help me.thanks1. When replying, use <reply>, don't post a new topic.
2. Implementing a singleton is a frequently asked question. Search before you post.
3. This is not a question about Swing. A more appropriate forum would be "New To Java Technology" or perhaps "Java Programming", but see point 1.
4. When posting code, keep it short. It increases the chance of readers looking at it. And in composing your shorter version for the forum, you just may solve your problem. -
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how can i get my oxygen 8 to transfer data into Logic?
its like there is no connection between the two.
but its not the cables, since everything was running fine before.
can anybody help me ?Go into the Audio MIDI Setup utility and check to see if you see it there. Considering that the Oxygen 8 is class compliant, you should just be able to plug it into the Mac. Perhaps, all it needs it to be recycled (turn it off and on again).
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