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- 1
- RMI between Java 1.4 and Java 1.5 problemWhen attempting to RMI between a 1.4 client and a 1.5 server ( with a
1.5 interface, remote object, stubs and skeletons using the -vcompat
rmic flag ), I get the following error:
java.lang.ClassNotFoundException:
java.rmi.server.RemoteObjectInvocation
Handler (no security manager: RMI class loader disabled)
The plot thickens. The 1.4 client will connect to the 1.5 server if I
run the 1.4 client classes in a 1.5 jvm. However, when I run the 1.4
compiled classes in a 1.4 jvm I get no joy.
Any ideas anyone?
The context is this: getting a Java strored procedure in an Oracle
database running a 1.4 jvm to send "trigger" information to a java
1.5 server on a different machine.
BTW, the rmi interface is very simple. One method, no return type and
the only passed parameter is a string.
- 2
- Java Parallel Port Programming with the Java Communications APII've read some messages on here regarding the Java Communications API
and the problems some have had with writing to parallel ports. I also
was puzzled by why I couldn't get this to work and then finally
figured out something that worked for me so am sharing this.
First of all, I am using Linux, downloaded the RXTX software,
downloaded the Sun x86/Solaris drivers for the Comm API (yes you need
this even for Windows/Linux), and installed per the instructions.
There were a few snags but the instructions contain much of what you
need to get past these.
The main problem I had was with properly wiring the cable from the
parallel port to drive my external circuits. You definately need some
sort of buffer chips to provide the interface from/to the parallel
port and your external devices (i.e. motors, LEDs, etc) and of course
power that circuit with an external 5V supply. That wasn't the problem
for me though. I had my data lines from the parallel port connected to
drive the external device...but it wasn't working with the Java
Communications API.
After some more tinkering, the trick was to tie the parallel port
status lines 10 & 11 (Ack and Busy) to low/ground and lines 12, 13, &
15 (paper out, select, & error) to high/5V. This should be done
through the output of a buffer chip though. I also tied lines 18-25 to
low/ground.
With that, the Java Communications API worked like a charm. The OS and
driver software must cleary require that the status input lines be
broadcasting signals that indicate the external device is OK...and by
tying the status lines mentioned to the proper signal levels...it
looks as if the external device is OK (i.e. no errors, not busy, has
paper, etc).
Previously, I had the status lines all tied to ground or had them
floating. After looking at a parallel port spec, I figured out what
the status lines are signalling to the system.
I hope this helps some of you trying to do something similar.
Regards,
Paul
/******************************************************************/
Paul J. Perrone
Assured Technologies, Inc.
Web: www.assuredtech.com
Author of various books on J2EE, Java, XML, and Web
Services: http://www.assuredtech.com/books_page.htm
Recently completed project includes the
"J2EE Developer's Handbook" geared for J2EE v1.4.
/******************************************************************/
- 2
- Eclipse - problem with external tool path name.I am running Eclipse 3.2 with on Windows with WebSphere WSAdmin set up
as an external tool. WSAdmin is basically a bat file that executes a
Java program. It takes a number of parameters one of which can be a
file containing properties.
External tool: C:\IBM\WAS51\DeploymentManager\bin\wsadmin.bat
Working directory ${workspace_loc:/WSAdmin}
Arguments:
-lang jacl
-host localhost -port 8879
-f ${resource_loc} ${resource_loc:/WSAdmin/WAS5.1/propertyFiles/Aquila/
aquila.properties}
The property file name "${resource_loc:/WSAdmin/WAS5.1/propertyFiles/
Aquila/aquila.properties}" gets converted to
"C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
"
Obviously the back slashes are being escaped. Is there any way I can
prevent this?
I have already tried "${resource_loc:\\WSAdmin\\WAS5.1\\propertyFiles\
\Aquila\\aquila.properties}" without success.
ERROR: file
C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
does not exist.
- 3
- SocketServer accept() fails to work (Linux)Hello,
I have the following problem with my server appllication:
This is typical server implemented in Java, using ServerSocket object,
waiting for client to connenct on ServerSocket.accept()
method. When the client connects (socket is received from accept() method)
it is handled by the server in separate thread.
The server writes the received data to the file and then closes the socket.
The problem:
the server handles about 20 connections daily, receiving about 100kB - 1MB
of data in each connection.
However after a few days the server fails to work,
the server waits on ServerSocket.accept() (as usually), however the clients
fail to connect to the server, but the server does not see
that any client tried to connect to it, it just waits on
ServerSocket.accept().
I'm using jre1.4.2_04 on Linux - Red Hat 9
Is there some bug in java-Linux-socket implementation or in my code ?
Thanks in advance.
This is the result of system netstat (after a few clients failed to connect
to the server):
tcp 78 0 localhost:32323 localhost:2560 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2568 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2576 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2584 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2340 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2592 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2348 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2344 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2356 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2352 CLOSE_WAIT
tcp 78 0 localhost:32323 localhost:2608 CLOSE_WAIT
A snippet of the server source:
private class Server
{
private ServerSocket _serverSckt = null;
private boolean _break = false;
ServerRunnable()
{
_serverSckt= new ServerSocket(32323);
_serverSckt.setSoTimeout(2000);
}
public void exeServer()
{
try {
Socket clientSckt = null;
while (!_break)
{
try {
clientSckt = _serverSckt.accept();
} catch (SocketTimeoutException ex) {
// ok, timeout occured, while loops again
} catch (InterruptedIOException ex) {
final String sMsg = "_serverSckt Interrupred!!!
managed to transfer " + ex.bytesTransferred + " [bytes]";
_LOGGER.error(sMsg, ex);
}
if (clientSckt != null) {
getClientHandler().handleClient(clientSckt); //
handles client in separate thread
// note: clientSckt is closed by client handler
clientSckt = null;
}
}
} catch (IOException e) {
_LOGGER.error(e);
} catch (Throwable thr) {
_LOGGER.fatal(thr);
} finally {
_serverRunning = false;
try {
_serverSckt.close();
} catch (IOException e) {
Assert.catchReport(e);
}
}
}
}
- 3
- From JAVA to EXE without the JRE
"Emil" <email***@***.com> wrote in message
news:email***@***.com...
> I would like to find a software or a way to have all my classes in my
> application as well as the .dll that I have (from C++) installed into
> one executable.
>
> Any suggestions will be appreciated.
>
> Or, can I have the JRE encapsulated somehow, and later unzip in the
> same directory so that the program would run ?
>
> Emil
>
I think a lot of IDE's have the jre with the install package. Try doing a
search of various installers. I think a popular one is InstallAnywhere
(www.zerog.com).
- 3
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- 3
- import Tidy jar, path to jarI can't pin down why I think this, but I believe there's a mismatch
between where the build file says to find Tidy.jar and "import
org.w3c.tidy.Tidy;" from Test16.java, line 9. data:
[thufir@localhost java]$
[thufir@localhost java]$ ll lib/
total 184
-rw-rw-r-- 1 thufir thufir 177868 Aug 1 2001 Tidy.jar
[thufir@localhost java]$
[thufir@localhost java]$ ant
Buildfile: build.xml
clean:
[delete] Deleting directory /home/thufir/java/bin
prepare:
[mkdir] Created dir: /home/thufir/java/bin
compile:
[javac] Compiling 1 source file to /home/thufir/java/bin
[javac] /home/thufir/java/src/atreides/tidyXhtml/Test16.java:9:
package
org.w3c.tidy does not exist
[javac] import org.w3c.tidy.Tidy;
[javac] ^
[javac] /home/thufir/java/src/atreides/tidyXhtml/Test16.java:38:
cannot find
symbol
[javac] symbol : class Tidy
[javac] location: class atreides.tidyXhtml.Test16
[javac] Tidy tidy = new Tidy();
[javac] ^
[javac] /home/thufir/java/src/atreides/tidyXhtml/Test16.java:38:
cannot find
symbol
[javac] symbol : class Tidy
[javac] location: class atreides.tidyXhtml.Test16
[javac] Tidy tidy = new Tidy();
[javac] ^
[javac] 3 errors
BUILD FAILED
/home/thufir/java/build.xml:18: Compile failed; see the compiler error
output for
details.
Total time: 4 seconds
[thufir@localhost java]$ cat build.xml
<project name="XHTML" default="package">
<import file="properties.tidy.xml" />
<target name="clean">
<delete dir="${outputDir}" />
</target>
<target name="prepare" depends="clean">
<mkdir dir="${outputDir}" />
</target>
<target name="compile" depends="prepare">
<javac
srcdir = "${sourceDir}"
destdir = "${outputDir}"
classpath = "${tidy.classpath}"
/>
</target>
<target name="package" depends="compile">
<jar jarfile="${outputDir}/${mainClass}.jar"
basedir="${outputDir}"
>
<manifest>
<attribute name="Main-Class"
value="${pkgPath}${mainClass}"/>
</manifest>
</jar>
</target>
</project>
[thufir@localhost java]$ cat properties.tidy.xml
<project name="properties">
<property name="outputDir" value="bin/" />
<property name="sourceDir" value="src/atreides/tidyXhtml/"
/>
<property name="mainClass" value="Test16" />
<property name="pkgPath" value="atreides.tidyXhtml." />
<property name="user.name" value="thufir" />
<path id="tidy.classpath">
<pathelement path="lib/Tidy.jar" />
</path>
</project>
[thufir@localhost java]$
thanks,
Thufir
- 4
- java assembler pjb[[[ Google probably will join this post to the 2003-01-03 thread of
the same name, your newsreader may be less helpful. ]]]
Kindly offline I was asked to confirm ...
Yes, instructions appear at:
http://groups.google.com/groups?threadm=2695edf1.0301031438.6fb5cd8%40posting.google.com
Yes I can fetch 48,910 bytes from:
http://members.aol.com/plforth/pjb.zip
Yes that .zip contains the compressed folder pjb/.
pjb/README.txt tells us nothing new except that I am
mailto:email***@***.com and we can click thru to pjb/cshlog.txt. In
turn, pjb/cshlog.txt suggests ..
Three steps:
--- 1) a procedure to produce the disassembly
HelloWorldAppJavaAssembler.java:
cd pjb
javac HelloWorldApp.java pjb/JavaAssembler.java
cp -ip HelloWorldApp.class HelloWorldApp.bin
java pjb.JavaAssembler HelloWorldApp
--- 2) A procedure to reassemble the disassembly:
javac HelloWorldAppJavaAssembler.java
rm HelloWorldApp.class
java HelloWorldAppJavaAssembler
--- 3) A comparison to show we have reassembled precisely the same
.class file:
diff HelloWorldApp.bin HelloWorldApp.class
Pat LaVarre
P.S. I ran this example in Mac OS X, with ships with javac installed,
even if you do not install the Developer's Disk. Linux with Java
should work identically. Windows with Java syntax for these is as
shown except `copy /-y` and `del` and `fc /b` for what here appears as
`cp -ip` and `rm` and `diff`.
- 4
- Java programmer in the London area?Hello,
A friend is looking for a Java programmer in the London area. He has a
small company and one software product. This application may be part
of an EU funded project.
Any one interested and available?!
Cheers
Geoff
- 5
- Automatically install java plug-inHello,
How can I automatically install (Internet explorer install dialogbox) the
java plugin from my HTML page.
Need sample code, please.
Thanks :)
- 7
- ** new open source requirements management tool **Hi,
OSRMT v1.1 has been released free under GPL for design
control/requirements engineering:
- custom forms to enter product features, requirements, use cases, test
cases, design etc.
- arrange all of these 'artifacts' within a hierarchal tree
- create dependencies between artifact e.g. feature a --> requirement b
--> source code c,d,e
- traceability matrix, identify artifacts not traced
- generate a dependency graph showing the impact of changing an
artifact (upward/downward)
- attach binary files or insert links to files or URLs with each
artifact
- customize the reference with artifact type specific priorities,
status, version etc.
- enter low level details to artifacts e.g. use case steps, data
fields, test steps etc.
- track entire history of change to artifact
- environment specific username and hashed password
- database independence - Oracle, MySQL, SQL Server, MS Access scripts
supplied
- configure client to connect to database direct or full blown J2EE
(client connects to JBoss)
- Rich Swing client runs anywhere (web client or run client over HTTP
in the future)
- Import/export artifacts from/to XML
- Technologies used include JGoodies (forms), JGraph (dependency tree),
Jakarta (db connection pooling), Rhino (custom scripting
forms/reports), Jasper (reports)
We welcome your review, comments, questions and requests for new
features.
You can download the latest release at http://www.osrmt.com
thanks!
Aron Smith
Fast, free requirements customized your way!
- 9
- The Smallcap Journal vINSIDE INFO ALERT
This advisory is based on exclusive insiders/agents information. (NHVP.PK)
NHVP has provided investors with 1000% + gains during the real estate boom, and now with the sector at its bottom, is ready to provide with results yet again..
OCT 13th: Northeast Development Corp. to Receive Funding from European Investment Firm. Preliminary discussions suggest figures of -3 million with a combination of real estate and equity collateralization.
GET IN ON MONDAY NOV 6th:
at 08 cents its a STEAL
- Volume: 8,000
- Volume: + 100%
- Price: +100%
The key to any tade is buying low and selling high, WELL the REAL ESTATE market has bottomed out and time to get in is now. We specialise in calling market bottom and when it comes to REAL ESTATE THIS IS THE BOTTOM, SO GET IN FOLKS
EARLY RETIREMENT IS CALLING
EARLY RETIREMENT IS CALLING
The NTSB's update outlined factual information about the crash, but did not conclude what the probable cause of the crash was. The full board will likely vote on a ruling at a later date.
Funeral services were also scheduled over the next several days for firefighters Jess McLean, 27, of Beaumont; Daniel Hoover-Najera, 20, of San Jacinto; Mark Loutzenhiser, 43, of Idyllwild; and Pablo Cerda, 23, of Fountain Valley. A public memorial service for all five men was planned for Sunday.
Oyler was charged with five counts of murder, 11 counts of arson and 10 counts of use of an incendiary device. The charges include seven fires in June, one in July, one in September and two in October.
The National Transportation Safety Board said the wind, coupled with the pilot's inability to turn sharply, forced the aircraft away from its intended path over the East River and into the building.
- 9
- JApplet Structure ProblemHi,
I can't run this Japplet in a web browser. But the eclipse applet
viewer works...
I guess it's beacause we havn't implemented the methods init, start,
stop and resize.
Can you post some standard example methods?
Should we move the code from the main method in the init method?
Any help will be appreciated...
Thanks alot
Dennis
package mn;
import java.awt.BorderLayout;
import java.awt.Dimension;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JSlider;
import javax.swing.JTextField;
public class NewJApplet extends javax.swing.JApplet {
private JPanel jPanel2;
private JPanel jPanel1;
private JPanel jPanel3;
private JPanel jPanel7;
private JLabel jLabel1;
private JLabel jLabel4;
private JPanel jPanel5;
private JLabel jLabel5;
private JTextField jTextField2;
private JSlider jSlider2;
private JPanel jPanel10;
private JLabel jLabel3;
private JPanel jPanel9;
private JCheckBox jCheckBox1;
private JPanel jPanel6;
private JPanel jPanel4;
private JSlider jSlider1;
private JLabel jLabel2;
private JButton OK;
private JTextField jTextField1;
private JButton jb1;
private JButton jb2;
{
//Set Look & Feel
try
{
javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch(Exception e) {
e.printStackTrace();
}
}
/**
* Auto-generated main method to display this
* JApplet inside a new JFrame.
*/
public static void main(String[] args) {
JFrame frame = new JFrame();
NewJApplet inst = new NewJApplet();
// inst.setSize(500,500);
frame.getContentPane().add(inst);
//((JComponent)frame.getContentPane()).setPreferredSize(new
java.awt.Dimension(
// 500,
// 500));
// frame.setSize(500,500);
frame.pack();
// ((JComponent)frame.getContentPane()).setPreferredSize(new
java.awt.Dimension(
// 500,
// 500));
// frame.setSize(500,500);
// inst.setSize(500,500);
frame.setVisible(true);
}
public NewJApplet() {
super();
initGUI();
}
private void initGUI() {
try {
BorderLayout thisLayout = new BorderLayout();
getContentPane().setLayout(thisLayout);
//this.setSize(576, 300);
{
jPanel2 = new JPanel();
getContentPane().add(jPanel2, BorderLayout.NORTH);
//jPanel2.setPreferredSize(new java.awt.Dimension(576, 78));
}
{
jPanel1 = new JPanel();
getContentPane().add(jPanel1, BorderLayout.SOUTH);
BorderLayout jPanel1Layout = new BorderLayout();
jPanel1.setLayout(jPanel1Layout);
//jPanel1.setPreferredSize(new java.awt.Dimension(576, 103));
{
jPanel3 = new JPanel();
BorderLayout jPanel3Layout = new BorderLayout();
jPanel3.setLayout(jPanel3Layout);
//jPanel3.setPreferredSize(new java.awt.Dimension(361, 113));
{
jPanel7 = new JPanel();
jPanel7.setPreferredSize(new java.awt.Dimension(600, 35));
{
jLabel2 = new JLabel();
jPanel7.add(jLabel2);
jLabel2.setText("Signal");
jLabel2.setPreferredSize(new java.awt.Dimension(
58,
17));
}
{
jSlider1 = new JSlider();
jPanel7.add(jSlider1);
}
{
jTextField1 = new JTextField();
jPanel7.add(jTextField1);
jTextField1.setText("1000");
}
{
jLabel1 = new JLabel();
jPanel7.add(jLabel1);
jLabel1.setText("Hz");
}
{
jb1 = new JButton();
jPanel7.add(jb1);
jb1.setText("OK");
}
jPanel3.add(jPanel7, BorderLayout.NORTH);
}
{
jPanel10 = new JPanel();
//jPanel10.setPreferredSize(new java.awt.Dimension(
// 339,
// 35));
{
jLabel4 = new JLabel();
jPanel10.add(jLabel4);
jLabel4.setText("Abtastung");
jLabel4.setPreferredSize(new java.awt.Dimension(
58,
17));
}
{
jSlider2 = new JSlider();
jPanel10.add(jSlider2);
}
{
jTextField2 = new JTextField();
jPanel10.add(jTextField2);
jTextField2.setText("1000");
}
{
jLabel5 = new JLabel();
jPanel10.add(jLabel5);
jLabel5.setText("Hz");
}
{
jb1 = new JButton();
jPanel10.add(jb1);
jb1.setText("OK");
}
jPanel3.add(jPanel10, BorderLayout.SOUTH);
}
jPanel1.add(jPanel3, BorderLayout.WEST);
}
{
jPanel4 = new JPanel();
BorderLayout jPanel4Layout = new BorderLayout();
jPanel4.setLayout(jPanel4Layout);
//jPanel4.setPreferredSize(new java.awt.Dimension(186, 68));
{
jPanel6 = new JPanel();
jPanel4.add(jPanel6, BorderLayout.NORTH);
{
jCheckBox1 = new JCheckBox();
jPanel6.add(jCheckBox1);
jCheckBox1.setText("Abtastungspunkte");
}
}
{
jPanel9 = new JPanel();
jPanel4.add(jPanel9, BorderLayout.CENTER);
//jPanel9
// .setPreferredSize(new java.awt.Dimension(202, 53));
{
jLabel3 = new JLabel();
jPanel9.add(jLabel3);
jLabel3.setText("Abtasttheorem ist erfé»®lt");
}
{
OK = new JButton();
jPanel9.add(OK);
OK.setText("Reset");
}
}
{
jPanel5 = new JPanel();
jPanel4.add(jPanel5, BorderLayout.WEST);
}
jPanel1.add(jPanel4, BorderLayout.EAST);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
- 11
- Where is the Information Systems industry headed?Our university is doing some survey work to consider where the world
of IS is headed. Since most of those here work in that world, I'm
interested in your thoughts, especially if you think you have a good
feel for job skills needed now and job skills needed in the future.
The question is sort of two pronged.
First, where are IS jobs headed? Will there continue to be a
significant demand for programming skills? What type of analysis
skills (especially in terms of those that can be developed
academically) are important? Are the requirements changing -- will
things look different in the next five to ten years?
Second, what are the specific things you would think IS majors should
understand when leaving the university? Do you think any of those
things are going to change in the next 5-10 years?
Those are broad questions since I want to leave a lot of room for your
thoughts. I'd like to have some idea of what your role is in your
business and what type of business you are in if you answer (I know
some people don't like to give specifics on here and that's fine --
just "we are a manufacturing company, or I'm a private consultant" is
enough).
Lastly, I'd point out that I'm not interested in specific language
skills, etc. I'm not interested in starting another Sun/Microsoft war
or anything like that. Our philosophy is that even if we use Java/Sun
products for everything we do, you ought to be able to go into a shop
using Smalltalk or .Net or whatever and get up to speed quickly -- so
it's the broader concepts that I'm referring to.
I don't know whether I'll reply to all responses unless I'm looking
for clarification, but I promise I'll give all serious consideration.
Thanks for any ideas,
Marty McMahone
University of Mary Hardin-Baylor
Texas
- 11
- JAVA NewbeeHi,
I have a few questions I'm hoping the group could answer for me. I'm
currently using Windows 98SE with all the latest updates running on a
Pentium III with 256M of RAM...
1) How can I tell what version of the JAVA runtime library I'm running?
2) I'd like to upgrade to the latest version of the RT (J2 V1.4.2). Will my
system support it?
3) Do I have to uninstall the previous version before upgrading? If so how
do I do this?
--
TIA,
Vic
My return email address is S P A M proof
please send replies to: vxp AT sympatico DOT ca
|
| Author |
Message |
Marcello
|
 Posted: 2003-7-11 17:16:00 |
Top |
java-programmer, JToggleButton dimension on ToolBar?
I have added (besides normal buttons with icons (for example "open
folder") JToggleButton buttons with text on them.
I'm not able:
1. to give jtogglebutton buttons the same dimension, that is fitted to
the text;
2. to make that when one is selected, it stays pressed too.
Thanks for every advice.
Regards.
Marcello.
|
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|
Index ‹ java-programmer |
- Next
- 1
- Creating video with JMFHello
I want to create a video with jmf.
I have a sound file and an image file.
How i can mixed the two files to obtain a video.
Any help or info will be welcome.
Nazha
- 2
- 3
- "package own.examples": necessary for NetBeans?Hello together
I am learning java and for my beginning, I just used a simple editor to
write the example codes. Now I wanna try NetBeans, but unfortunately all my
codes aren't working! I found out, that NetBeans need at the beginning of
the source file: "package own.examples" (i.e. where the source is stored).
Of course none of the sources I've written contains this add-on (because I
didn't need it). So they don't work with NetBeans. Why? If I am adding this
small "sentence" to the source code, I can compile it with NetBeans without
any problems, -> but not any longer with the command prompt (I am using
WinXP Pro at the moment).
What am I doing wrong? Is this sentence really necessary? I am asking,
'cause I want to implement a CMS (maybe JSF or Struts) and therefore I want
to know:
1) if it is better to use Eclipse or jEdit (do they need this extra
sentence, too?),
2) and if I am using an Application Server, it always needs "package
own.examples" or not? (so that maybe it is better not to use NetBeans 'cause
of this "lack")
thanks and cheers
mirco novena
- 4
- Please help for a LinkBinaryTreeInJavaI am new in this group,I don't know how far it would help me.
I tried to make a linked based binary tree following the book "data
structures and algorithms in java" By goodRich and tamassia.I did all
but I wanted to implement a function to determine whether a particular
node exists or not.All I want to implement a function boolean
exists(node n).Can anyone help??My program is as follows:-
import java.io.*;
interface Node {
Object getData();
int getID();
}
class TreeEmptyException extends Exception {
TreeEmptyException(String message) {
super(message);
}
}
class LinkBinTree {
BinNode root;
int size;
LinkBinTree(Object O) {
root = new BinNode(0);
}
class BinNode implements Node {
int id;
BinNode left;
BinNode right;
Object data;
BinNode(int iden) {
id = iden;
left = null;
right = null;
data = null;
}
BinNode(Object O) {
id = 0;
left = null;
right = null;
data = null;
}
public Object getData() {return data;}
public int getID() { return id;}
void addLeft(Object obj) {
BinNode b = new BinNode(obj);
left = b;
}
void addRight(Object obj) {
BinNode r = new BinNode(obj);
right = r;
}
BinNode addLeft(Node n,Object O) throws TreeEmptyException
{
if(!exists(n)) throw new TreeEmptyException("Tree doesn't
exists");
return n.addLeft(O);
}
BinNode addRight(Node n,Object O) throws TreeEmptyException{
if(!exists(n)) throw new TreeEmptyException("Tree doesn't
exists");
return n.addRight(O);
}
void preOrder(Node n) {
LinkQueueApp<Integer> q =new LinkQueueApp<Integer>();
int p=n.getID();
q.enqueue(p);
while(!q.isEmpty()) {
p =q.dequeue();
System.out.println("The pre-order is : "
+n.getData());
for(int i=p;(i==p+1) || (i==p+2)&&i<=size;i++)
q.enqueue(i);
}
}
void boolean exists(Node n) {
if(Node == root) return;
else {
if(Node
- 5
- Managing files using JavaHi! I'm new to Java and I would like to know how to manage files (e.g. rm,
mv, mkdir, etc.) using Java for a simple text-based application on Unix.
It's just an extension of a tutorial question at uni where we have to store
bank customer details to a file. Thank you!
pras
- 6
- 7
- How to map the table classes have more than one columns for its primary key in Hibernate?I have two existed tables, I am NOT allow to altering those tables
The 1st table (tableA) has one column for its primary key, the 2nd
table (tableB) has tow columns for its primary key. I am try to map
these two tables with Hibernate XML. Here are my XML file.
Please see ????? in tow places.
Question 1
1st ???? is <many-to-many> tag in class TableA, but <many-to-many> tag
only allows one column. How do I map it for two columns?
Question 2
2nd ????? is the <key> tag in class TableB, similar that <key> tag only
allows one column. How do I map it for two columns?
Thank Q very much in advance!
<hibernate-mapping auto-import="false"
default-lazy="true" default-access="field">
<class name="tableA" table="TABLEA" entity-name="TableA.class">
<id name="tableAId" type="string" column="TABLEAID"
access="field">
<generator class="native">
<param name="key">TABLEAID</param>
</generator>
</id>
<property name="column1" type="string" column="COLUMN1" />
<property name="column2" type="string" column="COLUMN2" />
.....
<set name="idsa" table="IDS" inverse="true">
<key column="TABLEAID" />
<many-to-many column="????" class="tableB" />
</set>
</class>
<class name="tablesB" table="TABLEB" entity-name="TableB.class">
<composite-id>
<!-- this table's primary key has two columns -->
<key-property name="tableBId1" type="string"
column="TABLEBID1" />
<key-property name="tableBId2" type="integer"
column="TABLEBID2" />
</composite-id>
<property name="column1" type="string" column="COLUMN1" />
<property name="column2" type="string" column="COLUMN2" />
....
<set name="idsb" table="IDS">
<key column="?????" />
<many-to-many column="TABLEAID" class="tableA" />
</set>
</class>
</hibernate-mapping>
- 8
- Getting the original URL in a custom 404 error page/servlet (Tomcat)Hi!
I'm trying to setup a servlet to handle all request that does not map
to a file on the webserver. I've set up a error-page in web.xml that
points to my servlet. I want my servlet to lookup the requested URL
in a database.
The only problem is that when the servlet is called, I want to get the
original URL requested by the user, not the URL of my 404 servlet.
Does anyone know how to do this?
Thanks in advance for any help!
Anders
- 9
- How to disable automatic scrolling of JScrollPane / JTextPane (Swing)Hi,
I want to be able to enable / disable the automatic scrolling performed when
adding text to a JTextPane. A JScrollPane has a viewport set to the
textpane. The text is added within a thread invoked using
SwingUtilities.invokeLater(...). Only the automatic scrolling should be
disabled, the user must still be able to scroll using the scrollbars etc.
and be able to enable the automatic scrolling again. (I'm using
jdk1.5.0_03.)
Here is how some parts my code look like:
...
<init>
...
jTextPane = new JTextPane();
JScrollPane jScrollPane = new JScrollPane();
jScrollPane.setViewportView(textPane);
...
<some-method>
...
StyledDocument styledDocument = (StyledDocument)jTextPane.getDocument();
...
<call addText-method>
...
<addText-method>
...
Runnable r = new Runnable() {
public void run() {
try {
styledDocument.insertString(styledDocument.getLength(), text,
style);
} catch (BadLocationException e) {
e.printStackTrace();
}
}
};
SwingUtilities.invokeLater(r);
...
Every time the <addText-method> is called the JScrollPane scrolls to the end
of the document. How can I enable / disable that automatic scrolling and
still use a thread / invokeLater to add the text?
Greetings,
ODB
- 10
- MVC Framework for Swing?Hello:
I'm looking for an MVC framework for Swing apps. I'm thinking of
something similar to Struts, but for desktop apps. I keep on writing
controllers for each Swing app I develope, and I can't believe there's not
a framework out there to expedite this.
Has anybody invented this yet?
Thanks
- 11
- Should I run JAVA or MS VM with Internet Explorer?I installed Java JRE 1.4.2_02 to support Mozilla Firebird while I try it
out.
This plug-in has enabled itself to run with IE6 too. Should I disable it in
IE6? Or should I disable MS VM? Or should I let both run together?
Thank you.
Jim Andrus
- 12
- dragging graphics in a JTableI am interested in creating a graphics object (for example, a big dot)
creating it such that it can be moved within a cell and then moved
across cells. I had something working outside of a JTable (using
Point2D) and overiding paintComponent such that the drawing routine
looks like:
public void paintComponent(Graphics g)
{
super.paintComponent(g);
Graphics2D g2d = (Graphics2D)g;
g2d.setComposite(makeComposite(.5f));
}
I have two questions at this point. First, is it feasible? and Second,
if feasible, how would one generally go about it (custom editor, firing
events when it the object gets near a cell border, etc.?)?
hanks - Lou
- 13
- Learning J2ee, got newbie question.Hello. I picked up a Beginner's J2ee book. I'm going through the
examples, but one of the examples I am stuck on. I cannot get past the
error message:
404 - Resource Not found.
I am running Tomcat, I believe 5.5.8. Here's the directory structure
that I have:
webapp/Ch05/
login.html
Login.java
Login.class
Here's the login.html:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Login</title>
</head>
<body>
<h1>Login</h1>
Please enter your username and password.
<form action="/Ch05/Login" method="POST">
<p><input type="text" name="username" length="40">
<p><input type="password" name="password" length="40">
<p><input type="submit" value="Submit">
</form>
</body>
</html>
My browser complains that Login resource is unavailable. Here's
Login.java, which is compiled and in the same directory.
package web;
import java.servlet.http.*;
import java.io.*;
public class Login extends HttpServlet {
public void doPost( HttpServletRequest request, HttpServletResponse
response)
{
String username = request.getParameter( "username");
try {
response.setContentType( "text/html");
PrintWriter writer = response.getWriter();
writer.println( "<html><body>");
writer,println( "Thank you, " + username +
". You are now logged into the system.");
writer.println( "</body></html>");
writer.close();
} catch( Exception e) {
e.printStackTrace();
}
}
}
Anyways, does anyone know what I'm doing wrong here? (I just typed the
example pretty quickly, so there might be typos, but the above compiles
without complaint.) Thanks.
- 14
- Java XML Parsing ErrorsHello,
I am new to Java. I need to find two values in XML file, compare them
with other two values and, if match, add to new XML string. Please,
help me with 2 errors:
String new XML = null;
NodeList nodes = document.getElementsByTagName("Car");
for(int i=0; i<nodes.getLength(); i++){
Element e1 = (Element) nodes.item(i);
Element e2 = (Element) nodes.item(i);
String e1val = e1.getNodeValue("Color"); //ERROR: method getNodeValue
not found in org.w3c.dom.Element
String e2val = e2.getAttribute("Type");
if(e1val.equals("Red") && e2val.equals("Sedan")){
newXML = //HOW TO ADD THIS NODE AS STRING?
}
return newXML;
}
THANK YOU!!!
- 15
- retrieve an output param defined in a stored procedure from java codeHi,
I've made a java application and i use a CallableStatement to call a
stored procedure. I use the method getString() of this class to
retrieve the value of the definded output param but it retuns "" (no
value). The code of the stored procedure is
CREATE procedure pruebaICM
@pANI varchar(20),
@pTABLA varchar(20),
@pInsert varchar(500),
@pUpdate varchar(1000),
@pFLAG varchar(1),
@pResultado VARCHAR(1) OUTPUT
as
begin
DECLARE @ani varchar(20)
declare @cliente int
DECLARE @sentencia nvarchar(1000)
DECLARE @tabla nvarchar(20)
DECLARE @sentencia_where nvarchar(50)
DECLARE @sql nvarchar(1050)
SET NOCOUNT ON
set @tabla = @pTABLA
set @ani = @pANI
SELECT @sql= N'select @cliente=count(ani) from '+ @tabla + N'
where ani = ' + @ani
SELECT @sql
exec sp_executesql @sql, N'@Cliente INT OUTPUT', @Cliente
OUTPUT
SELECT @Cliente
if (@pFLAG = 'A') or (@pFLAG = 'Actualizar') or (@pFLAG = 'I')
begin
if (@cliente = 0)
begin
set @sentencia = N'insert into ' +
@pTABLA + N' (ani) values (' + @pInsert + N')'
select @sentencia
EXEC sp_executesql @sentencia
set @pResultado = 1
SELECT @pResultado
end
if (@cliente = 1)
begin
set @sentencia = N'update ' + @pTABLA +
N' set ' + @pUpdate
set @sentencia_where = N' where ANI =
' + @pANI
set @sql = @sentencia +
@sentencia_where
select @sql
EXEC sp_executesql @sql
set @pResultado = 2
SELECT @pResultado
end
end
else if (@pFLAG = 'B') or (@pFLAG = 'Borrar')
begin
if (@cliente = 0)
begin
set @pResultado = 0
SELECT @pResultado
end
else if (@cliente = 1)
begin
set @sentencia = N'delete from '+
@pTABLA + N' where ANI = ' + @pANI
EXEC sp_executesql @sentencia
set @pResultado = 3
SELECT @pResultado
end
end
end
However, when i call this stored procedure fron a query analyzer
windows it works well, the statements
are executed correctly and i can see that the value of the aoutput
param (@pResultado) changes depends on
the sentence executed (insert, update, delete). Then, why can't i
retrieve this param from my java code?
Thans very much for helping me!!!!!!!!!!!!!
P.D: i'm using jsk1.3.1_04 and sql server 7
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