| Problem starting out with Java . . . |
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Index ‹ java-programmer
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- 4
- Q: Possible to auto-fallback back to MS JVM from Sun JVM ?Hi all.
Ok, so it's no secret, MS can no longer distribute its Java VM with
its OS'.
Naturally, that didn't stop me from installing an old one so
WindowsUpdate would see it and upgrade it to the last (MS) build:
5.00.3810
I also installed the latest SUN Java VM (1.4.2_03)
*** Flash ***
Woaaaah!! Just saw their "Law & Order" game
(http://java.com/en/index.jsp)
Gotta try that!
*** End Flash ***
So what I want in fact, is to use SUN's VM as default, but to
automatically switch back to MS' VM for those sites that still use it
(for example, my bank still uses it, so I can't issue payments if Sun
is default -- annoying).
Of course, this can be done manually in "Set Program Access and
Defaults" in hte Window scontrol panel, but you have to select one or
the other.
Same with Sun's Java Plug-in control panel (Advanced tab).
So... is there a way to perform an auto-fall-back to MS JVM when an
applet cannot load/initialise with the Sun JVM ?
Or create a list of site which must use MS instead of Sun?
Any help appreciated.
M.T.
- 6
- stupid genericsWhen I first heard about generics I was excited. A great idea finally
available in Java. But the way they are implemented really makes no sense.
Because of type erasure generics do nothing that 1.4 code didn't already do
by using Object as "generic" class for all (sub)classes.
And the problem with arrays of generic classes? Simply ridiculous. There
is no sane reason why the following code (from a self-learning chess
program I've been working on) should not work, and yet...
ArrayList<Piece>[] board;
board = new ArrayList<Piece>[8]; // error: cannot create a generic
// array of ArrayList<Piece>
board[0] = new ArrayList<Piece>();
board[0].add(0, new Rook(false, 0, 8));
where of course Rook is a subclass of Piece.
I'm forced to use board = new ArrayList[8]; which of course gives an
unchecked warning.
They should just throw away the whole generics thing and replace it with a
C++ like approach.
- 9
- hi friends.please helpI am trying t make a jTable Using Abstract TableModel. But my JTable
doesnot appear on the frame.I have written two classes myTable and
jTable2 .My code is given below:
import javax.swing.*;
import java.awt.*;
public class myTable {
public static void main(String args[]){
JTable2 tbl2=new JTable2();
JTable aTbl=new JTable(tbl2);
aTbl.updateUI();
aTbl.setVisible(true);
JFrame frame=new JFrame("Jtable using AbstractTableModel");
JPanel pan=new JPanel();
JScrollPane scp=new JScrollPane();
scp.add(aTbl);
pan.add(scp);
frame.getContentPane().add(pan);
frame.setVisible(true);
frame.pack();
}
}
import javax.swing.*;
import java.sql.*;
import java.util.*;
import javax.swing.table.*;
public class JTable2 extends AbstractTableModel{
Connection con;
Statement stmt;
ResultSet rs;
int columns;
Vector allRows;
Vector row=new Vector();
String [] columnNames={"ID_CODE","NAME","SECTION"};
public JTable2(){
// connect to database
try{
db_connect();
getData();
}catch(Exception ex){
ex.printStackTrace();
}
}
void db_connect() throws SQLException{
try{
Class.forName("oracle.jdbc.driver.OracleDriver");
con=DriverManager.getConnection("jdbc:oracle:thin:@158.144.71.242:1521:dbadp","payroll","sush");
System.out.println("Connected");
}catch(Exception ex){
ex.printStackTrace();
}
}
void getData() throws SQLException {
try{
stmt=con.createStatement();
rs=stmt.executeQuery("select idcode,id_name,sec_code from
employee");
ResultSetMetaData rsMetaData=rs.getMetaData();
columns=rsMetaData.getColumnCount();
allRows=new Vector();
while(rs.next()){
Vector newRow=new Vector();
for(int i=1;i<=columns;i++){
newRow.addElement(rs.getObject(i));
}
allRows.addElement(newRow);
}
}catch (Exception ex){
ex.printStackTrace();
}
}
public int getRowCount(){
return allRows.size();
}
public int getColumnCount(){
return columns;
}
public Object getValueAt(int aRow,int aColumn){
row=(Vector) allRows.elementAt(aRow);
return row.elementAt(aColumn);
}
public boolean isCellEditable(int row, int col){
return false;
}
}
- 9
- please explain this simple constructmy instructor likes to use this construct in class but never really
explained why/how it works:
while (true)
{
if (something) return; // break from while
}
can someone shed some light how this works?
- 9
- Hot-deployment of EAR/JAR files using classloaders (on JBoss app server)Hi,
I am trying the following scenario:
- I deploy an app.ear into the jboss server.
- app.ear invokes a session bean deployed separately (sessionbean.jar)
- everything works fine
- I modify sessionbean.jar
- I redeploy it without restarting the server (hot deployment)
When app.ear invokes the sessionbean, it refers to the previous instance of
the sessionbean. And because I have replaced it, it does not find the
class...
Then I read on, and I find that if you write custom class loaders, you can
load new versions of classes on the fly (dynamic loading).
So I wrote a custom class loader, which works fine when I call a basic java
library, but there does not seem to be a way of 'redeploying' this
sessionbean.jar as a bean (you can't invoke it anymore with the home/remote
interface)....
Can someone help me here ? I am basically trying to redeploy beans without
redeploying the app server and having them immediately rebind to whichever
application needs to use them.
Thanks
Steph
- 15
- writing email attachment file to diskI'm trying to capture an email attachment and write it to disk.
I've coded the following lines in my attempt. The program seems
to run and creates the local file alex99.pdf. However, when I
tried to open it, it says it's corrupted and/or wasn't properly
decoded. Any ideas?
Properties props = new Properties();
Session session = Session.getDefaultInstance(props, null);
Store store = session.getStore("pop3");
store.connect(host, username, password);
Folder folder = store.getFolder("inbox");
folder.open(Folder.READ_ONLY);
Message message[] = folder.getMessages();
for (int i = 0, n = message.length; i < n; i++) {
System.out.println(i + ": " + message[i].getFrom() + "\t"
+ message[i].getSubject());
Object obj = message[i].getContent();
if (obj instanceof String) {
System.out.println(">>>plain text");
} else if (obj instanceof Multipart) {
System.out.println("Multipart");
Multipart mp = (Multipart) obj;
System.out.println("mp count = " + mp.getCount());
for (int j = 0, nn = mp.getCount(); j < nn; j++) {
Part part = mp.getBodyPart(j);
String disposition = part.getDisposition();
if ((disposition != null)&& ((disposition.equals(Part.ATTACHMENT) ||
(disposition.equals(Part.INLINE))))) {
System.out.println("attachment");
FileOutputStream fos = new FileOutputStream("alex99.pdf");
part.writeTo(fos);
} else if (disposition==null) {
MimeBodyPart mbp = (MimeBodyPart)part;
if (mbp.isMimeType("text/plain")) {
System.out.println("text/plain");
} else {
System.out.println("other mime type");
}................................
- 15
- reinventing the wheelhttp://www.ted.com/index.php/talks/view/id/162
This is off topic, but Java folk will like find it amusing. It shows
a Dutch invention to replace the wheel, various mechanical walking
machines. It has a mechanical step counter, a sort of primitive finite
state automaton..
--
Roedy Green Canadian Mind Products
The Java Glossary
http://mindprod.com
- 15
- Choosing elements to display in a JSP using StrutsHello,
I am very new to everything web development, so please bear with me.
My development environment is:
Win2k
Tomcat 4.0.30
Apache 2.0.48
mod_jk/2.0.4
j2sdk 1.4.2
Struts 1.1
mysql 4.0.18
I am using Struts to develop my webapp in an MVC fashion. I am using
forms based authentication to a mysql database.
Using the tools in my development environment, I am wondering if it is
possible to choose the elements displayed in a JSP based on the group
the user is in (and still stay withing the MVC framework), or if that
is even the right approach. I prefer to not show options to users if
they do not have permissions to perform them.
Any suggestions or advice would be great. If you know of any
tutorials/books/web resources that you could point me to, that would
be fantastic as well.
Thanks in advance.
Randy
- 15
- Override prepareRenderer()I've gathered that in order to change the background color of a row,
one can either use the tablecellrenderer or can override the
prepareRenderer() method. I have chosen to override the
prepareRenderer() method. My question (and a reather silly one) is
exactly how to call this method to then color your rows.
I already have a jtable with is autogenerated by netbeans and all of
the code I've seen, the jtable is created programmatically.
Here is what I TRIED to do (any help is greatly appreciated):
public void updateGUI(String newValue){
DefaultTableModel errorTableModel = (DefaultTableModel)
parentScreen.jTableErrors.getModel();
int numRows = errorTableModel.getRowCount();
numRows++;
errorTableModel.setRowCount(numRows);
parentScreen.jTableErrors.setModel(errorTableModel);
Object newObjectError = (Object) newValue;
parentScreen.jTableErrors.setValueAt(newObjectError, numRows - 1, 0);
JTable coloredTable = new JTable( errorTableModel )
{
public Component prepareRenderer(
TableCellRenderer renderer, int row, int column)
{
Component c = super.prepareRenderer(renderer, row, column);
String message = (String) getValueAt(row, column);
String[] dividedMsg = message.split(":");
if(dividedMsg[0].equals("Error: ")){
this.setBackground(Color.RED);
}
else{
this.setBackground(Color.YELLOW);
}
return c;
}
};
parentScreen.jTableErrors = coloredTable;
}
- 15
- Animation ProblemLew wrote:
> James Sarjeant wrote:
>> Thank you so much everyone, it worked with the javax.swing.Timer events.
>> Still got other bugs to iron out but thats a huge hurdle overcome.
>> Thanks again
>
> Remember: you think you have gotten away from the advice about the EDT,
> but you haven't.
>
It's a pesky thing isn't it :-).
--
Knute Johnson
email s/nospam/knute/
- 16
- 16
- poster or wallpaperHi all
I need posters or wallpapers which is about programming and computer
science, for hanging
thanks
- 16
- 16
- Changing log level at runtimeYou know the situation: logging output is useless .. until you need it.
Is there a way to configure log4j in a web application or an EJB with
log level ERROR and have it change to DEBUG whenever an error happens?
The only thing I can imagine is having a special servlet that you have
to call with the browser to have it trigger a log level change for the
whole web application.
Are there better ways? Maybe with the jdk built-in logger?
Or with log4j JMX? But I could not find any docs or examples.
Thx,
Juergen
- 16
- hide NullPointerExceptionI have a GUI which throws a nullpointerexception when things go wrong.
Then it closes. That nullpointerexception is expected and I want it
ignored since before that it has already informed the user that
something has gone wrong and its closing. How can I do this? If I just
put the part of the function throwing the exception within try/catch,
it tends to hang. If I leave it as is, it throws the exception but
closes fine. I just don't want the user to see that exception.
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| Author |
Message |
Ash
|
 Posted: 2004-10-24 9:06:00 |
Top |
java-programmer, Problem starting out with Java . . .
Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
every time i try to import java.awt.* , I can't use any of the
methods(like they don't exist). I can compile it fine, but when I try to
run it, I get "exception in class main".
Can anyone help me, please?
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flaps81
|
| Posted: 2004-10-24 16:34:00 |
Top |
java-programmer >> Problem starting out with Java . . .
On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
wrote:
>Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>every time i try to import java.awt.* , I can't use any of the
>methods(like they don't exist). I can compile it fine, but when I try to
>run it, I get "exception in class main".
>
>Can anyone help me, please?
Post the code that gives you trouble, an exception can be many
things...
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Ash
|
| Posted: 2004-10-24 21:52:00 |
Top |
java-programmer >> Problem starting out with Java . . .
flaps81 wrote:
> On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
> wrote:
>
>
>>Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>every time i try to import java.awt.* , I can't use any of the
>>methods(like they don't exist). I can compile it fine, but when I try to
>>run it, I get "exception in class main".
>>
>>Can anyone help me, please?
>
>
> Post the code that gives you trouble, an exception can be many
> things...
OK - Here it is:
import java.awt.*;
public class TestFrame
{
public static void main(String[] args)
{
Frame f = new Frame();
f.reshape(10,10,200,200);
Button b = new Button("Hello Cyberspace");
b.setBackground(Color.black);
b.setForeground(Color.white);
f.add(b);
f.show();
}
}
Like I said - it compiles fine, but gives me an exception every time I
try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
Thanks
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Raymond DeCampo
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| Posted: 2004-10-24 22:49:00 |
Top |
java-programmer >> Problem starting out with Java . . .
Ash wrote:
> flaps81 wrote:
>
>> On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
>> wrote:
>>
>>
>>> Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>> every time i try to import java.awt.* , I can't use any of the
>>> methods(like they don't exist). I can compile it fine, but when I try
>>> to run it, I get "exception in class main".
>>>
>>> Can anyone help me, please?
>>
>>
>>
>> Post the code that gives you trouble, an exception can be many
>> things...
>
> OK - Here it is:
>
> import java.awt.*;
> public class TestFrame
> {
> public static void main(String[] args)
> {
> Frame f = new Frame();
> f.reshape(10,10,200,200);
>
> Button b = new Button("Hello Cyberspace");
> b.setBackground(Color.black);
> b.setForeground(Color.white);
> f.add(b);
> f.show();
> }
> }
>
> Like I said - it compiles fine, but gives me an exception every time I
> try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
>
This program compiles fine (although with a deprecation warning on
reshape()) and runs fine for me (JDK 1.4.2_04-b05 on linux, no IDE to
muddy the waters). Please post the exception you are getting. Also, I
would encourage you to try this on the command line if you haven't
already to determine if NetBeans is the problem.
HTH,
Ray
--
XML is the programmer's duct tape.
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Ash
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| Posted: 2004-10-25 0:00:00 |
Top |
java-programmer >> Problem starting out with Java . . .
Raymond DeCampo wrote:
> Ash wrote:
>
>> flaps81 wrote:
>>
>>> On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
>>> wrote:
>>>
>>>
>>>> Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>>> every time i try to import java.awt.* , I can't use any of the
>>>> methods(like they don't exist). I can compile it fine, but when I
>>>> try to run it, I get "exception in class main".
>>>>
>>>> Can anyone help me, please?
>>>
>>>
>>>
>>>
>>> Post the code that gives you trouble, an exception can be many
>>> things...
>>
>>
>> OK - Here it is:
>>
>> import java.awt.*;
>> public class TestFrame
>> {
>> public static void main(String[] args)
>> {
>> Frame f = new Frame();
>> f.reshape(10,10,200,200);
>>
>> Button b = new Button("Hello Cyberspace");
>> b.setBackground(Color.black);
>> b.setForeground(Color.white);
>> f.add(b);
>> f.show();
>> }
>> }
>>
>> Like I said - it compiles fine, but gives me an exception every time I
>> try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
>>
>
> This program compiles fine (although with a deprecation warning on
> reshape()) and runs fine for me (JDK 1.4.2_04-b05 on linux, no IDE to
> muddy the waters). Please post the exception you are getting. Also, I
> would encourage you to try this on the command line if you haven't
> already to determine if NetBeans is the problem.
>
> HTH,
> Ray
>
Nice sig. Ok - I get this from the compiler output:
Note: D:\Java\Bin\eXtropia\TestFrame.java uses or overrides a deprecated
API.
Note: Recompile with -deprecation for details.
Finished TestFrame.
and this from the program output:
java.lang.NoClassDefFoundError: Bin/eXtropia/TestFrame (wrong name:
TestFrame)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
at
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
Exception in thread "main"
I'll try doing it throught the command window.
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Ash
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| Posted: 2004-10-25 0:10:00 |
Top |
java-programmer >> Problem starting out with Java . . .
Ash wrote:
> Raymond DeCampo wrote:
>
>> Ash wrote:
>>
>>> flaps81 wrote:
>>>
>>>> On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
>>>> wrote:
>>>>
>>>>
>>>>> Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>>>> every time i try to import java.awt.* , I can't use any of the
>>>>> methods(like they don't exist). I can compile it fine, but when I
>>>>> try to run it, I get "exception in class main".
>>>>>
>>>>> Can anyone help me, please?
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> Post the code that gives you trouble, an exception can be many
>>>> things...
>>>
>>>
>>>
>>> OK - Here it is:
>>>
>>> import java.awt.*;
>>> public class TestFrame
>>> {
>>> public static void main(String[] args)
>>> {
>>> Frame f = new Frame();
>>> f.reshape(10,10,200,200);
>>>
>>> Button b = new Button("Hello Cyberspace");
>>> b.setBackground(Color.black);
>>> b.setForeground(Color.white);
>>> f.add(b);
>>> f.show();
>>> }
>>> }
>>>
>>> Like I said - it compiles fine, but gives me an exception every time
>>> I try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
>>>
>>
>> This program compiles fine (although with a deprecation warning on
>> reshape()) and runs fine for me (JDK 1.4.2_04-b05 on linux, no IDE to
>> muddy the waters). Please post the exception you are getting. Also,
>> I would encourage you to try this on the command line if you haven't
>> already to determine if NetBeans is the problem.
>>
>> HTH,
>> Ray
>>
> Nice sig. Ok - I get this from the compiler output:
>
> Note: D:\Java\Bin\eXtropia\TestFrame.java uses or overrides a deprecated
> API.
> Note: Recompile with -deprecation for details.
> Finished TestFrame.
>
> and this from the program output:
>
> java.lang.NoClassDefFoundError: Bin/eXtropia/TestFrame (wrong name:
> TestFrame)
> at java.lang.ClassLoader.defineClass0(Native Method)
> at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
> at
> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
> at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
> at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
> at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
> at java.security.AccessController.doPrivileged(Native Method)
> at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
> at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
> Exception in thread "main"
>
> I'll try doing it throught the command window.
Under the cmd window, I get
D:\Java\Bin\eXtropia>java TestFrame.class
Exception in thread "main" java.lang.NoClassDefFoundError: TestFrame/class
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flaps81
|
| Posted: 2004-10-25 1:04:00 |
Top |
java-programmer >> Problem starting out with Java . . .
On Sun, 24 Oct 2004 16:09:31 GMT, Ash <email***@***.com>
wrote:
>Ash wrote:
>> Raymond DeCampo wrote:
>>
>>> Ash wrote:
>>>
>>>> flaps81 wrote:
>>>>
>>>>> On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>>> Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>>>>> every time i try to import java.awt.* , I can't use any of the
>>>>>> methods(like they don't exist). I can compile it fine, but when I
>>>>>> try to run it, I get "exception in class main".
>>>>>>
>>>>>> Can anyone help me, please?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Post the code that gives you trouble, an exception can be many
>>>>> things...
>>>>
>>>>
>>>>
>>>> OK - Here it is:
>>>>
>>>> import java.awt.*;
>>>> public class TestFrame
>>>> {
>>>> public static void main(String[] args)
>>>> {
>>>> Frame f = new Frame();
>>>> f.reshape(10,10,200,200);
>>>>
>>>> Button b = new Button("Hello Cyberspace");
>>>> b.setBackground(Color.black);
>>>> b.setForeground(Color.white);
>>>> f.add(b);
>>>> f.show();
>>>> }
>>>> }
>>>>
>>>> Like I said - it compiles fine, but gives me an exception every time
>>>> I try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
>>>>
>>>
>>> This program compiles fine (although with a deprecation warning on
>>> reshape()) and runs fine for me (JDK 1.4.2_04-b05 on linux, no IDE to
>>> muddy the waters). Please post the exception you are getting. Also,
>>> I would encourage you to try this on the command line if you haven't
>>> already to determine if NetBeans is the problem.
>>>
>>> HTH,
>>> Ray
>>>
>> Nice sig. Ok - I get this from the compiler output:
>>
>> Note: D:\Java\Bin\eXtropia\TestFrame.java uses or overrides a deprecated
>> API.
>> Note: Recompile with -deprecation for details.
>> Finished TestFrame.
>>
>> and this from the program output:
>>
>> java.lang.NoClassDefFoundError: Bin/eXtropia/TestFrame (wrong name:
>> TestFrame)
>> at java.lang.ClassLoader.defineClass0(Native Method)
>> at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
>> at
>> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
>> at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
>> at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
>> at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
>> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
>> at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
>> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
>> Exception in thread "main"
>>
>> I'll try doing it throught the command window.
>Under the cmd window, I get
>D:\Java\Bin\eXtropia>java TestFrame.class
>Exception in thread "main" java.lang.NoClassDefFoundError: TestFrame/class
Are you sure that the file is named TestFrame.java !?!
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Ash
|
| Posted: 2004-10-25 1:19:00 |
Top |
java-programmer >> Problem starting out with Java . . .
flaps81 wrote:
> On Sun, 24 Oct 2004 16:09:31 GMT, Ash <email***@***.com>
> wrote:
>
>
>>Ash wrote:
>>
>>>Raymond DeCampo wrote:
>>>
>>>
>>>>Ash wrote:
>>>>
>>>>
>>>>>flaps81 wrote:
>>>>>
>>>>>
>>>>>>On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
>>>>>>wrote:
>>>>>>
>>>>>>
>>>>>>
>>>>>>>Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>>>>>>every time i try to import java.awt.* , I can't use any of the
>>>>>>>methods(like they don't exist). I can compile it fine, but when I
>>>>>>>try to run it, I get "exception in class main".
>>>>>>>
>>>>>>>Can anyone help me, please?
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>>Post the code that gives you trouble, an exception can be many
>>>>>>things...
>>>>>
>>>>>
>>>>>
>>>>>OK - Here it is:
>>>>>
>>>>>import java.awt.*;
>>>>>public class TestFrame
>>>>> {
>>>>> public static void main(String[] args)
>>>>> {
>>>>> Frame f = new Frame();
>>>>> f.reshape(10,10,200,200);
>>>>>
>>>>> Button b = new Button("Hello Cyberspace");
>>>>> b.setBackground(Color.black);
>>>>> b.setForeground(Color.white);
>>>>> f.add(b);
>>>>> f.show();
>>>>> }
>>>>> }
>>>>>
>>>>>Like I said - it compiles fine, but gives me an exception every time
>>>>>I try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
>>>>>
>>>>
>>>>This program compiles fine (although with a deprecation warning on
>>>>reshape()) and runs fine for me (JDK 1.4.2_04-b05 on linux, no IDE to
>>>>muddy the waters). Please post the exception you are getting. Also,
>>>>I would encourage you to try this on the command line if you haven't
>>>>already to determine if NetBeans is the problem.
>>>>
>>>>HTH,
>>>>Ray
>>>>
>>>
>>>Nice sig. Ok - I get this from the compiler output:
>>>
>>>Note: D:\Java\Bin\eXtropia\TestFrame.java uses or overrides a deprecated
>>>API.
>>>Note: Recompile with -deprecation for details.
>>>Finished TestFrame.
>>>
>>>and this from the program output:
>>>
>>>java.lang.NoClassDefFoundError: Bin/eXtropia/TestFrame (wrong name:
>>>TestFrame)
>>> at java.lang.ClassLoader.defineClass0(Native Method)
>>> at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
>>> at
>>>java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
>>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
>>> at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
>>> at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
>>> at java.security.AccessController.doPrivileged(Native Method)
>>> at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
>>> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
>>> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
>>>Exception in thread "main"
>>>
>>>I'll try doing it throught the command window.
>>
>>Under the cmd window, I get
>>D:\Java\Bin\eXtropia>java TestFrame.class
>>Exception in thread "main" java.lang.NoClassDefFoundError: TestFrame/class
>
>
>
> Are you sure that the file is named TestFrame.java !?!
YES! And I have NO IDEA what I'm doing wrong! I've added the Bin folder
to my path and classpath variables! I've copied the SIMPLEST SOURCES off
the web and ALWAYS it does this! What am I doing wrong!?!
:(
|
| |
|
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|
flaps81
|
| Posted: 2004-10-25 2:23:00 |
Top |
java-programmer >> Problem starting out with Java . . .
On Sun, 24 Oct 2004 17:18:47 GMT, Ash <email***@***.com>
wrote:
>flaps81 wrote:
>> On Sun, 24 Oct 2004 16:09:31 GMT, Ash <email***@***.com>
>> wrote:
>>
>>
>>>Ash wrote:
>>>
>>>>Raymond DeCampo wrote:
>>>>
>>>>
>>>>>Ash wrote:
>>>>>
>>>>>
>>>>>>flaps81 wrote:
>>>>>>
>>>>>>
>>>>>>>On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
>>>>>>>wrote:
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>>Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>>>>>>>every time i try to import java.awt.* , I can't use any of the
>>>>>>>>methods(like they don't exist). I can compile it fine, but when I
>>>>>>>>try to run it, I get "exception in class main".
>>>>>>>>
>>>>>>>>Can anyone help me, please?
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>Post the code that gives you trouble, an exception can be many
>>>>>>>things...
>>>>>>
>>>>>>
>>>>>>
>>>>>>OK - Here it is:
>>>>>>
>>>>>>import java.awt.*;
>>>>>>public class TestFrame
>>>>>> {
>>>>>> public static void main(String[] args)
>>>>>> {
>>>>>> Frame f = new Frame();
>>>>>> f.reshape(10,10,200,200);
>>>>>>
>>>>>> Button b = new Button("Hello Cyberspace");
>>>>>> b.setBackground(Color.black);
>>>>>> b.setForeground(Color.white);
>>>>>> f.add(b);
>>>>>> f.show();
>>>>>> }
>>>>>> }
>>>>>>
>>>>>>Like I said - it compiles fine, but gives me an exception every time
>>>>>>I try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
>>>>>>
>>>>>
>>>>>This program compiles fine (although with a deprecation warning on
>>>>>reshape()) and runs fine for me (JDK 1.4.2_04-b05 on linux, no IDE to
>>>>>muddy the waters). Please post the exception you are getting. Also,
>>>>>I would encourage you to try this on the command line if you haven't
>>>>>already to determine if NetBeans is the problem.
>>>>>
>>>>>HTH,
>>>>>Ray
>>>>>
>>>>
>>>>Nice sig. Ok - I get this from the compiler output:
>>>>
>>>>Note: D:\Java\Bin\eXtropia\TestFrame.java uses or overrides a deprecated
>>>>API.
>>>>Note: Recompile with -deprecation for details.
>>>>Finished TestFrame.
>>>>
>>>>and this from the program output:
>>>>
>>>>java.lang.NoClassDefFoundError: Bin/eXtropia/TestFrame (wrong name:
>>>>TestFrame)
>>>> at java.lang.ClassLoader.defineClass0(Native Method)
>>>> at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
>>>> at
>>>>java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
>>>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
>>>> at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
>>>> at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
>>>> at java.security.AccessController.doPrivileged(Native Method)
>>>> at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
>>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
>>>> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
>>>> at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
>>>> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
>>>>Exception in thread "main"
>>>>
>>>>I'll try doing it throught the command window.
>>>
>>>Under the cmd window, I get
>>>D:\Java\Bin\eXtropia>java TestFrame.class
>>>Exception in thread "main" java.lang.NoClassDefFoundError: TestFrame/class
>>
>>
>>
>> Are you sure that the file is named TestFrame.java !?!
>YES! And I have NO IDEA what I'm doing wrong! I've added the Bin folder
>to my path and classpath variables! I've copied the SIMPLEST SOURCES off
>the web and ALWAYS it does this! What am I doing wrong!?!
>
>:(
Beats me, I've tried to copy paste the code you posted and it works
fine. The only way I can get a java.lang.NoClassDefFoundError is if
the filename is wrong...
|
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|
| |
|
Michael Saunby
|
| Posted: 2004-10-25 2:26:00 |
Top |
java-programmer >> Problem starting out with Java . . .
"Ash" <email***@***.com> wrote in message
news:XtRed.153761$email***@***.com...
>>>
>>>Under the cmd window, I get
>>>D:\Java\Bin\eXtropia>java TestFrame.class
>>>Exception in thread "main" java.lang.NoClassDefFoundError:
>>>TestFrame/class
>>
>>
>>
>> Are you sure that the file is named TestFrame.java !?!
> YES! And I have NO IDEA what I'm doing wrong! I've added the Bin folder
> to my path and classpath variables! I've copied the SIMPLEST SOURCES off
> the web and ALWAYS it does this! What am I doing wrong!?!
>
You're not typing "java TestFrame" but that alone might not fix things. I
can't be bothered to sort through all your output.
Basically it's like this - "java someclass" will execute main() in
"someclass" (it must be static) which will have the filename
"someclass.class" and the soucefile will be called "someclass.java". Of
course the class could be in a package, which would require you to run it
using "java packagename.someclass".
The fact that you have NO IDEA suggests that you really ought to read
rather more and post less. There's loads of info at http://java.sun.com
Unless you really enjoy looking stupid.
Michael Saunby
|
| |
|
| |
|
Ash
|
| Posted: 2004-10-25 5:16:00 |
Top |
java-programmer >> Problem starting out with Java . . .
Ash wrote:
> Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
> every time i try to import java.awt.* , I can't use any of the
> methods(like they don't exist). I can compile it fine, but when I try to
> run it, I get "exception in class main".
>
> Can anyone help me, please?
OK - when I reinstalled netbeans, their sample helloworld app worked
fine - untill I removed this line:
package bin;
What is that for?
|
| |
|
| |
|
The Abrasive Sponge
|
| Posted: 2004-10-25 10:31:00 |
Top |
java-programmer >> Problem starting out with Java . . .
Ash wrote:
> Ash wrote:
>
>> Raymond DeCampo wrote:
>>
>>> Ash wrote:
>>>
>>>> flaps81 wrote:
>>>>
>>>>> On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
>>>>> wrote:
>>>>>
>>>>>
>>>>>> Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>>>>> every time i try to import java.awt.* , I can't use any of the
>>>>>> methods(like they don't exist). I can compile it fine, but when I
>>>>>> try to run it, I get "exception in class main".
>>>>>>
>>>>>> Can anyone help me, please?
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> Post the code that gives you trouble, an exception can be many
>>>>> things...
>>>>
>>>>
>>>>
>>>>
>>>> OK - Here it is:
>>>>
>>>> import java.awt.*;
>>>> public class TestFrame
>>>> {
>>>> public static void main(String[] args)
>>>> {
>>>> Frame f = new Frame();
>>>> f.reshape(10,10,200,200);
>>>>
>>>> Button b = new Button("Hello Cyberspace");
>>>> b.setBackground(Color.black);
>>>> b.setForeground(Color.white);
>>>> f.add(b);
>>>> f.show();
>>>> }
>>>> }
>>>>
>>>> Like I said - it compiles fine, but gives me an exception every time
>>>> I try to run it. I'm using NetBeans 3.6 and J2SKD 1.4.2.
>>>>
>>>
>>> This program compiles fine (although with a deprecation warning on
>>> reshape()) and runs fine for me (JDK 1.4.2_04-b05 on linux, no IDE to
>>> muddy the waters). Please post the exception you are getting. Also,
>>> I would encourage you to try this on the command line if you haven't
>>> already to determine if NetBeans is the problem.
>>>
>>> HTH,
>>> Ray
>>>
>> Nice sig. Ok - I get this from the compiler output:
>>
>> Note: D:\Java\Bin\eXtropia\TestFrame.java uses or overrides a
>> deprecated API.
>> Note: Recompile with -deprecation for details.
>> Finished TestFrame.
>>
>> and this from the program output:
>>
>> java.lang.NoClassDefFoundError: Bin/eXtropia/TestFrame (wrong name:
>> TestFrame)
>> at java.lang.ClassLoader.defineClass0(Native Method)
>> at java.lang.ClassLoader.defineClass(ClassLoader.java:537)
>> at
>> java.security.SecureClassLoader.defineClass(SecureClassLoader.java:123)
>> at java.net.URLClassLoader.defineClass(URLClassLoader.java:251)
>> at java.net.URLClassLoader.access$100(URLClassLoader.java:55)
>> at java.net.URLClassLoader$1.run(URLClassLoader.java:194)
>> at java.security.AccessController.doPrivileged(Native Method)
>> at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
>> at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
>> at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:274)
>> at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
>> at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
>> Exception in thread "main"
>>
>> I'll try doing it throught the command window.
>
> Under the cmd window, I get
> D:\Java\Bin\eXtropia>java TestFrame.class
> Exception in thread "main" java.lang.NoClassDefFoundError: TestFrame/class
Run it as:
D:\Java\Bin\eXtropia>java TestFrame
Leave out the .class when creating a new VM. :)
|
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|
| |
|
Hal Rosser
|
| Posted: 2004-10-25 10:33:00 |
Top |
java-programmer >> Problem starting out with Java . . .
"Ash" <email***@***.com> wrote in message
news:_dDed.153496$email***@***.com...
> Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
> every time i try to import java.awt.* , I can't use any of the
> methods(like they don't exist). I can compile it fine, but when I try to
> run it, I get "exception in class main".
>
> Can anyone help me, please?
Start out with notepad - not netbeans.
---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.781 / Virus Database: 527 - Release Date: 10/21/2004
|
| |
|
| |
|
Ash
|
| Posted: 2004-10-26 4:20:00 |
Top |
java-programmer >> Problem starting out with Java . . .
flaps81 wrote:
> On Sun, 24 Oct 2004 01:06:02 GMT, Ash <email***@***.com>
> wrote:
>
>
>>Hey. Im new to Java, and am having a prroblem with the netbeans IDE.
>>every time i try to import java.awt.* , I can't use any of the
>>methods(like they don't exist). I can compile it fine, but when I try to
>>run it, I get "exception in class main".
>>
>>Can anyone help me, please?
>
>
> Post the code that gives you trouble, an exception can be many
> things...
ARG!!!!!!!!!!!!
I HAVE *NO* JAVA.LANG FILES! ANYWHERE! WTF!?! I TRY TO USE jikes.exe
INSTEAD, and it gives me
*** Semantic Error: You need to modify your classpath, sourcepath,
bootclasspath
, and/or extdirs setup. Jikes could not find package "java.lang" in:
WTF!?! Please help!
|
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Index ‹ java-programmer |
- Next
- 1
- synchronize vs gateI have a singleton in a web service that provides a collection and
self-updates it on a periodic basis:
doSelfUpdate()
create temporary collection (time consuming)
syncronize
update temporary collection from current collection (fast)
create temporary reference 'old' to current collection
point current collection reference to temporary collection
end syncronize
do stuff with 'old' collection (time consuming)
done
getCollection()
synchronize
just waiting on monitor
end synchronize
return collection
done
It seems to me each thread accessing the getCollection method must
wait on the monitor every time it is accessed -- which is not what I
want. I just want to open and close the gate for a few milliseconds
while the self-update is being done. What do y'all think about
something like this:
boolean isBusy=false;
doSelfUpdate()
create temporary collection
isBusy=true;
update temporary collection from current collection
create temporary reference 'old' to current collection
point current collection reference to temporary collection
isBusy=false;
do stuff with 'old' collection
done
getCollection()
maxWait=10000
waited=0
while(isBusy && waited <maxWait) {
waited+=500
if(waited>=MaxWait) log error;
wait 500
}
return collection
done
IMHO this means each thread consuming getCollection is a tiny bit
slower because it has a condition that must be tested, but as a group
they are not waiting in line for the monitor. Is this right?
- 2
- [Struts] <set-property> how does it works?Hi all
I know that in <action> mapping I can use a sub-tag <set-property
property="" value="">
How can I access to these information inside an action?!
As I can imagine there should be a getProperty/getProperties method to the
ActionMapping class ....but it isn't!!
I appreciate any hint..
thanx
--
ShadowMan
- 3
- How to simulate a busy taskHi everybody,
I was trying to perform some tests in a multithreading application and
I would like to simulate overloading. That is, I want to simulate
threads performing a task that takes a certain time T. I have thought
of the following possibilities:
-Implement a method that sleeps during T milliseconds. Problem: this
does not overload the computer, during those T milliseconds other
agents can execute.
-Implement a method that performs a busy wait (while(true){...}) and
exits when T milliseconds have passed. Problem: there could be context
switches in between, and so it could happen that another thread
executes in the meantime (and that execution time should not count to
decide when to terminate the busy wait).
-Similar to the previous approach, but we try to count the milliseconds
elapsed "by hand". That is, in every iteration we obtain the
System.currentTimeMillis() and count as much as 1 millisecond (if it is
really at least 1 millisecond greater than the value measured in the
previous iteration). In this way, if the thread is interrupted while
executing the method, nothing happens because we count at most 1
millisecond per iteration. This does not work either too well, because
more than 1 millisecond could have been elapsed between measures.
So I'm not really sure if I can do this with some precision. If you
have any suggestions, please let me know. Thanks in advance,
S.
- 4
- Javascript problem - I don't know what to do about it?!?!Here is the script I have in my page :
<!-- Begin
function popUp(URL) {
day = new Date();
id = day.getTime();
eval("page" + id + " = window.open(URL, '" + id + "',
'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=0,width=194,height=146,left
= 440,top = 288');");
}
// End -->
</script>
It opens a new window when the user clicks on a certain link.
Well, somewhere else in the page, I embeded a flash media object and
found out now that everytime the page opens, the pop up window opens
too which is NOT what I want. I want the Popup window to only open
when the user clicks on a text link (which it did work perfectly until
I put in the flash object).
So why is the flash object calling the popup window instead of just
playing like it is supposed to?
- 5
- J2ME & EclipseI have just started playing with J2ME, using a software example I downloaded
from http://www.garret.ru/~knizhnik/En_Home.htm#Shopper. I can successfully
build the application and run it both in the emulator outside of eclipse
using emulatorw, and also on my Nokia phone.
I just can not run it within Eclipse, with or without debug. I get the
following error message:
Exception in thread "main" java.lang.UnsatisfiedLinkError:
com.sun.midp.main.Configuration.getProperty0(Ljava/lang/String;)Ljava/lang/String;
at com.sun.midp.main.Configuration.getProperty0(Native Method)
at com.sun.midp.main.Configuration.getProperty(Configuration.java:32)
at com.sun.midp.lcdui.Resource.<clinit>(Resource.java:30)
at com.sun.midp.main.Main.initSystemLabels(Main.java:686)
at com.sun.midp.main.Main.main(Main.java:103)
- 6
- Wholesale Alain Silberstein Architecte Automatic Replica Watches AS019 Discount, Fake WatchWholesale Alain Silberstein Architecte Automatic Replica Watches AS019
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watch, which is sure the watch you are looking for at low price. There
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If you are looking for the well know brand watch and information about
it, you came to the right place. Here you can find such fine you I top
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- How many float values in range 0f - 1f inclusive?
How many float values can be represented
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--
Yes, I've had elementary arithmetic,
but it was a long time ago, and I
probably wasn't paying enough attention.
- 8
- Problem with deploying war-files with jbossHello,
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When I deploy this war-file in the right folder in jboss.
../server/default/deploy/..
some file (in this case jpeg's) were't unzip/deploy in the temp-folder.
Unzipping the war-file is showing that this files are there.
What can I do to solve this problem?
Any suggestion for an argument, when starting up the jboss or something else.
Every help would be nice.
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- 9
- Question about Database Connection PoolsHi Newsgroup,
i have written an Objectpool for Database connections. All locked
connections are stored within a Vector (called _used) and all unlocked
connections are stored within a second Vector (called _unused).
Now consider the following situation:
------------------- code ---------------------------------------
DbConnectionPool pool = new DbConnectionPool( driver, url, user, passwd);
Connection dbcon = pool.getConnection();
int sizeUsed = pool.getUsed(); // returns 1, thats ok
// ...
// ... lets do some actions with dbcon ....
// ...
// ... programmer does not notice
// ... that dbcon is still in use.
// ... so he checks out a new connection
//
dbcon = pool.getConnection();
sizeUsed = pool.getUsed(); // return 2, uppps!!!
------------------- code ---------------------------------------
Because the programmer checks out a new connections, two database
connections are now marked as _used.
Is there any possibility to avoid such situations?
Thank you in advance
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- 10
- Eclipse HTTP PluginLooking for an eclipse plugin (with source code preferibly) that will
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with a proprietary Server side app and want to be able to pass a large
string as a parameter to a JSP page.
Any help is greatly appreciated.
Jason
- 11
- getDocumentBase and getCodeBase not recognized...Hi, Im having a slight problem.
I am trying to load an image object with the code below, and I am NOT
extending Applet in my class because I am working on an application.
The problem is that getCodeBase AND getDocumentBase are not being
recognized by my application, however I am sure that the required jars
are in the build path... and that I've referenced them... most likely
inapproprirately.
My code is set up like this
Base\
Base\graphics\img.gifs.
Code follows, I trimmed the imports mostly off, but the rest appear
below the code...
Thanks for your advice.
import java.net.URL;
import java.applet.Applet;
............
String strImageUp = "graphics/up.gif";
URL urlUp = getClass().getResource(strImageUp);
Image imgUp = null;
try {
MediaTracker m = new MediaTracker(this);
imgUp = getImage(getDocumentBase(), strImageUp);
m.addImage(imgUp, 0);
m.waitForAll();
}
catch (Exception e) {
e.printStackTrace();
}
................
import javax.crypto.interfaces.PBEKey;
import javax.imageio.*;
import java.awt.image.*;
import java.io.File;
import java.io.IOException;
import java.util.Vector;
import java.awt.*;
import javax.swing.*;
import javax.swing.border.Border;
import java.util.LinkedList;
import java.util.ListIterator;
import java.awt.event.ActionListener; //for buttons
import java.awt.event.ActionEvent; //for button events
import java.awt.event.KeyEvent; //for key shortcuts
import java.math.*; //percentage rounding
- 12
- Alternatives to Cobra for GUI<->Backend I/F ?Hi there
Im working on an existing system which has a backend written in C/C++
and we are using J2SE for the GUI forend. The backend end forend can
be on different systems/platforms. Current we are using CORBA as the
interface which works ok but it is tedious having to implement C++
impl's and then also do the same in the java code. One of the problems
is that we are continually adding new interfaces and modify existing
ones. Its my impression that CORBA is more useful for more stable
interfaces possibly between different vendors software.
Are there any other technologies that it may be worth me looking into.
It struck me that plain old CGI may be an alternative, and I've been
told that SOAP maybe a way forward, there are probably others I don't
know anything about and have never heard of. Any views on this matter
would be great as Im a little out of touch because there are so many
new technologies out there now days.
Cheers
Steve
- 13
- Implementing an interface in eclipseUsing IntelliJ, I would be able to implement an interface whilst having
it open in the editor. You could open the context window using the
keyboard and choose to implement interface and magically the
implementation appears complete with the statement "... implements
SomeInterface"
Does anyone know how to do the same in eclipse so I don't have to open
that New Class window and manually choose the interface?
- 14
- Java Thread,Hi,
I am spawing a new Thread in my application, which runs as an
background process. I am looking to set -Xmx512mb memory to this new
Thread programatically. How do i do it.
thanks
- 15
- page counter in JSP & JSTLHi everyone,
I have a web application which consists of 2 JSP pages. Each page
displays the number of time the page has been accessed. This is
accomplished by using a jsp declaration :
(this sample is taken from the following book : "Servlets and
JavaServer Pages : The J2EE Technology Web Tier")
<%! int pageCount = 0;
void addCount() { pageCount++; }
%>
<html>
<head>
<title>page1.jsp</title>
</head>
<body>
<% addCount(); %>
This page has been visited <%= pageCount %> times.
</body>
</html>
Now, let's say I want to ruse the JSTL tags instead. This will give
something like (not tested) :
<c:set var='pageCount1' scope='application' value='${pageCount1 +1}'/
>
This page has been visited <c:out var='pageCount1/>' times.
I have 2 questions :
Q#1 : with JSP declarations, the page counter can have the SAME name
on each JSP. But if I use an application scoped counter, the counter
will have to have a DIFFERENT name for each page (ie : pageCounter1
for page1.jsp, pageCounter2 for page2.jsp). Is there a way to use the
same name ?
Q#2 : how do I initialize the value of the application scoped counter
if I use JSTL ? (for example, what if I want the counter to start from
100 ?)
Thanks for helping !
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