New to Java: Help Needed
Hi,
I am writing a utility to monitor all the objects created by my application. I want to be able to get not only values of class variables(for which the reflection package seems pretty useful), but also instance variables.
For example.
public class myClass {
//Constructor
public myClass(int i) {
// another class instantiates this one
myClass mc = new myClass(10);
myClass mc1 = new myClass(20);
I need to keep track of the the handles mc and mc1 and the
other initializations they do based on the value passed at runtime.
Is there a way to to this. Or even better, is there someplace in Java which stores all the objects instantiated and their handles?
Any suggestions would be greatly appreciated.
Thnx
cvsan
How do I access private and proteced variables. By default only the public variables are accessible via the reflect class as in the example below.
Class c = rc.getClass();
String s = c.getName();
System.out.println(s);
try { abcField = c.getField("abc");
where abc is a public instance variable. If abc is a private instance variable, the above example fails.
Is there any way to override the data hiding feature of Java?
Thanks
cvsan
Similar Messages
-
New to java,,,help needed urgently
I am geeting a compile error..."cannot resolve symbol" in my main class. The program is supposed to prompt the user for five sets of data, and calculate the tax and total of the entered products and print it back to the screen, it is also supposed to calculate the cheapest and most expensive item and print them back. can someone pls shed some light on this error msg, as I cant seem to get my head around it.
import java .io.*;
import java.util.StringTokenizer;
import java.text.NumberFormat;
import java.util.Locale;
//set up a class to call on the constructors from the catalogueitem class
public class Myassg4
private static final int MAX = 2;//sets the length to 2
private static CatalogueItem[] prodlist ;//sets array for product list
NumberFormat cash = NumberFormat.getCurrencyInstance(new Locale("en","AU"));
private static void main(String[] args) throws IOException
{//declare the variables and initialize
double preTotal = 0.00;
String inString;
double maximum, lowest;
double sum = 0.00;
BufferedReader stdin = new BufferedReader (new
InputStreamReader(System.in));
prodlist = new CatalogueItem[];//sets the length (THIS IS WHERE THE PROBLEM OCCURS!!!!)
System.out.println("Enter 5 sets of data");
//loop through the array and read the data in
for(int i = 0;i <prodlist.length;i++)
inString = stdin.readLine();
//create a String Tokenizer to read the data separately
StringTokenizer tok = new StringTokenizer(inString, ":");
prodlist[i] = new CatalogueItem(tok.nextToken(), tok.nextToken(),
Double.parseDouble(tok.nextToken()));
}//end of loop
//create a header and print the data back to the screen
System.out.println();
System.out.println("LISTING OF ALL GOODS");
System.out.println();
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int j = 0;j <prodlist.length;j++){
System.out.println(prodlist[j].getCatno()+"\t"+prodlist[j].getDesc()+
"\t"+prodlist[j].getPrice()+"\t"+prodlist[j].getTax()
+"\t"+prodlist[j].getIncTax());
I have errors every where the prodlist is used, I know I am not initializing it correctly but dont know what the alternatives are.daniel here is the entire code if you do get a chance can you pls have a look at it for me thanks.
import java .io.*;
import java.util.StringTokenizer;
import java.text.NumberFormat;
import java.util.Locale;
//set up a class to call on the constructors from the catalogueitem class
public class Myassg4
private static final int MAX = 2; //sets the length to 2
private static CatalogueItem[] prodlist; //sets array for product list
NumberFormat cash = NumberFormat.getCurrencyInstance(new Locale("en","AU"));
private static void main(String[] args) throws IOException
{//declare the variables and initialize
double preTotal = 0.00;
String inString;
double maximum, lowest;
double sum = 0.00;
BufferedReader stdin = new BufferedReader (new
InputStreamReader(System.in));
prodlist = new CatalogueItem[5];//sets the length
System.out.println("Enter 5 sets of data");
//loop through the array and read the data in
for(int i = 0;i <prodlist.length;i++)
inString = stdin.readLine();
//create a String Tokenizer to read the data separately
StringTokenizer tok = new StringTokenizer(inString, ":");
prodlist[i] = new CatalogueItem(tok.nextToken(), tok.nextToken(),
Double.parseDouble(tok.nextToken()));
}//end of loop
//create a header and print the data back to the screen
System.out.println();
System.out.println("LISTING OF ALL GOODS");
System.out.println();
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int j = 0;j <prodlist.length;j++){
System.out.println(prodlist[j].getCatno()+"\t"+prodlist[j].getDesc()+
"\t"+prodlist[j].getPrice()+"\t"+prodlist[j].getTax()
+"\t"+prodlist[j].getIncTax());
//use this data and call the cheapest method to print
//the cheapest goods in the catalogue
System.out.println();
System.out.println("CHEAPEST GOODS IN THE CATALOGUE");
System.out.println();
lowest = cheapest(prodlist, MAX);
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int k = 0;k <prodlist.length;k++){
if(prodlist[k].getTaxInc == lowest)
System.out.println(prodlist[k].Catno()+"\t"+prodlist[k].getDesc()+
"\t"+prodlist[k].getPrice()+"\t"+prodlist[k].getTax()
+"\t"+prodlist[k].getIncTax());
//use the listing of all goods and call the most expensive method
//to calculate and display back on screen
System.out.println();//create two lines of space in between
System.out.println();
System.out.println("MOST EXPENSIVE GOODS IN THE CATALOGUE");
System.out.println();
maximun = expensive(prodlist, MAX);
System.out.println("Cat\tDescription\tExTax\tTax\tIncTax");
System.out.println("___\t___________\t_____\t___\t______");
System.out.println();
for(int l = 0;l < prodlist.length;l++){
if(prodlist[l].getTaxInc == maximum)
System.out.println(prodlist[l].Catno()+"\t"+prodlist[l].getDesc()+
"\t"+prodlist[l].getPrice()+"\t"+prodlist[l].getTax()
+"\t"+prodlist[l].getIncTax());
//print the pretax worth of goods by calling the method and display
System.out.println();//create a two lines of space in between
System.out.println();
System.out.println("TOTAL OF PRE-TAX WORTH OF CATALOGUE ITEMS: "+preTaxWorth
(prodlist));
//print the avg tax payable per item
System.out.println();
System.out.println("AVERAGE AMOUNT OF TAX PAYABLE PER ITEM:"+avgTax
(prodlist));
//declare the other methods within the scope of the main class
public static double cheapest(CatalogueItem[] prodlist, int size)
double lowest = prodlist[0].getIncTac();
for(int i = 0; i < size;i++)
if(prodlist.getIncTax() < lowest)
lowest = prodlist[i].getIncTax();
return lowest;
public static double expensive(CatalogueItem[] prodlist, int size)
double maximum = prodlist[0].getTaxInc();
for(int i = 0; i < size; i++)
if(prodlist[i].getIncTax() > maximum)
maximum = prodlist[i].getIncTax();
return maximum;
public static double preTaxWorth(CatalogueItem[] prodlist)
{//add all the getPrice's in together
double preTax = 0; //prodlist[0].getPrice();
for(int i =0; i <prodlist.length; i++)
preTax += prodlist[i].getPrice();
return preTax;
public static double avgTax(CatalogueItem[] prodlist)
{//run through the array and add all the getTax amounts up.
double sum = 0;
for(int i = 0; i < prodlist.length; i++)
sum = sum + prodlist[i].getTax();
//to get the avg we divide the sum by the MAX number of entries
double Total = sum / MAX;
return Total;
}//end of main class
//CatalogueItem class
//catalogue item class
//ensure that the accesors and mutators
//are visible and cannot be overridden
class CatalogueItem
//declare the data types
private String catno;
private String desc;
private double price;
//declare the taxation rate constant
//but make it visible
public CatalogueItem(){
catno = " ";
desc = " ";
double price;
//declare the full constructor
CatalogueItem (String inCatno, String inDesc, double Price)
inCatno = catno;
inDesc = desc;
Price = price;
//name accessor---not overidable
public final String getCatno()
return catno;
//name product description accessor--not overidable
public final String getDesc()
return desc;
//name the extax method
public double getPrice()
return price;
//tax utility method
public double Tax()
double Tax;
Tax = 00.15 * getPrice();
return Tax;
//Including Tax method
public double IncTax()
double IncTax;
IncTax = Tax() + getPrice();
return IncTax; -
New to Java and need help with this program..please!
I'd really appreciate any helpful comments about this program assignment that I have to turn in a week from Friday. I'm taking a class one night a week and completely new to Java. I'd ask my professor for help, but we can't call him during the week and he never answers e-mails. He didn't tell us how to call from other classes yet, and I just can't get the darn thing to do what I want it to do!
The assignment requirements are:
1. Change a card game application that draws two cards
and the higher card wins, to a Blackjack application
2. Include a new class called Hand
3. The Hand class should record the number of draws
4. The application should prompt for a number of draws
5. The game is played against the Dealer
6. The dealer always draws a card if the dealer's hand total is <= 17
7. Prompt the player after each hand if he wants to quit
8. Display the total games won by the dealer and total and the total games wond by the player after each hand
9. Display all of the dealer's and player's cards at the
end of each hand
10. Player has the option of drawing an additional card after the first two cards
11. The Ace can have a value of 11 or 1
(Even though it's not called for in the requirements, I would like to be able to let the Ace have a value of 1 or an 11)
The following is my code with some comments about a few things that are driving me nuts:
import java.util.*;
import javax.swing.*;
import java.text.*;
public class CardDeck
public CardDeck()
deck = new Card[52];
fill();
shuffle();
public void fill()
int i;
int j;
for (i = 1; i <= 13; i++)
for (j = 1; j <= 4; j++)
deck[4 * (i - 1) + j - 1] = new Card(i, j);
cards = 52;
public void shuffle()
int next;
for (next = 0; next < cards - 1; next++)
int rand = (int)(Math.random()*(next+1));
Card temp = deck[next];
deck[next] = deck[rand];
deck[rand] = temp;
public final Card draw()
if (cards == 0)
return null;
cards--;
return deck[cards];
public int changeValue()
int val = 0;
boolean ace = false;
int cds;
for (int i = 0; i < cards; i++)
if (cardValue > 10)
cardValue = 10;
if (cardValue ==1) {
ace = true;
val = val + cardValue;
if ( ace = true && val + 10 <= 21 )
val = val + 10;
return val;
public static void main(String[] args)
CardDeck d = new CardDeck();
int x = 3;
int i;
int wins = 1;
int playerTotal = 1;
do {
Card dealer = (d.draw());
/**I've tried everything I can think of to call the ChangeValue() method after I draw the card, but nothing is working for me.**/
System.out.println("Dealer draws: " + dealer);
do {
dealer = (d.draw());
System.out.println(" " + dealer);
}while (dealer.rank() <= 17);
Card mine = d.draw();
System.out.println("\t\t\t\t Player draws: "
+ mine);
mine = d.draw();
System.out.println("\t\t\t\t\t\t" + mine);
do{
String input = JOptionPane.showInputDialog
("Would you like a card? ");
if(input.equalsIgnoreCase("yes"))
mine = d.draw();
System.out.println("\t\t\t\t\t\t" + mine);
playerTotal++;
else if(input.equalsIgnoreCase("no"))
System.out.println("\t\t\t\t Player stands");
else
System.out.println("\t\tInvalid input.
Please try again.");
I don't know how to go about making and calling a method or class that will combine the total cards delt to the player and the total cards delt to the dealer. The rank() method only seems to give me the last cards drawn to compare with when I try to do the tests.**/
if ((dealer.rank() > mine.rank())
&& (dealer.rank() <= 21)
|| (mine.rank() > 21)
&& (dealer.rank() < 22)
|| ((dealer.rank() == 21)
&& (mine.rank() == 21))
|| ((mine.rank() > 21)
&& (dealer.rank() <= 21)))
System.out.println("Dealer wins");
wins++;
else
System.out.println("I win!");
break;
} while (playerTotal <= 1);
String stop = JOptionPane.showInputDialog
("Would you like to play again? ");
if (stop.equalsIgnoreCase("no"))
break;
if (rounds == 5)
System.out.println("Player wins " +
(CardDeck.rounds - wins) + "rounds");
} while (rounds <= 5);
private Card[] deck;
private int cards;
public static int rounds = 1;
public int cardValue;
/**When I try to compile this nested class, I get an error message saying I need a brace here and at the end of the program. I don't know if any of this code would work because I've tried adding braces and still can't compile it.**/
class Hand()
static int r = 1;
public Hand() { CardDeck.rounds = r; }
public int getRounds() { return r++; }
final class Card
public static final int ACE = 1;
public static final int JACK = 11;
public static final int QUEEN = 12;
public static final int KING = 13;
public static final int CLUBS = 1;
public static final int DIAMONDS = 2;
public static final int HEARTS = 3;
public static final int SPADES = 4;
public Card(int v, int s)
value = v;
suit = s;
public int getValue() { return value; }
public int getSuit() { return suit; }
public int rank()
if (value == 1)
return 4 * 13 + suit;
else
return 4 * (value - 1) + suit;
/**This works, but I'm confused. How is this method called? Does it call itself?**/
public String toString()
String v;
String s;
if (value == ACE)
v = "Ace";
else if (value == JACK)
v = "Jack";
else if (value == QUEEN)
v = "Queen";
else if (value == KING)
v = "King";
else
v = String.valueOf(value);
if (suit == DIAMONDS)
s = "Diamonds";
else if (suit == HEARTS)
s = "Hearts";
else if (suit == SPADES)
s = "Spades";
else
s = "Clubs";
return v + " of " + s;
private int value; //Value is an integer, so how can a
private int suit; //string be assigned to an integer?
}Thank you so much for offering to help me with this Jamie! When I tried to call change value using:
Card dealer = (d.changeValue());
I get an error message saying:
Incompatible types found: int
required: Card
I had my weekly class last night and the professor cleared up a few things for me, but I've not had time to make all of the necessary changes. I did find out how toString worked, so that's one question out of the way, and he gave us a lot of information for adding another class to generate random numbers.
Again, thank you so much. I really want to learn this but I'm feeling so stupid right now. Any help you can give me about the above error message would be appreciated. -
Convert C++ prog into Java( I m new in java)help urgent
hi all,
i am very new in java. i have code of C++.i have to convert it in to Java.please help me on urgent basis.plz provide me solution.
I am looking for positive response.code is below:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <fstream.h>
#include <iostream.h>
//#include <sha.h> //24112003
//#include<wincrypt.h>
char ntc(unsigned char n){
if (n<26) return 'A'+n;
if (n<52) return 'a'-26+n;
if (n<62) return '0'-52+n;
if (n==62) return '+';
if (n==63)return '/';
unsigned char ctn(char c){
if (c=='/') return 63;
if (c=='+') return 62;
if ((c>='A')&&(c<='Z')) return c-'A';
if ((c>='a')&&(c<='z')) return c-'a'+26;
if ((c>='0')&&(c<='9')) return c-'0'+52;
if (c=='~') return 80;
return 100;
int b64decode(char from,char to,int length){
unsigned char c,d,e,f;
char A,B,C;
int i;
int add;
char *tot=to;
for (i=0;i+3<length;){
add=0;
A=B=C=0;
c=d=e=f=100;
while ((c==100)&&(i<length)) c=ctn(from[i++]);
while ((d==100)&&(i<length)) d=ctn(from[i++]);
while ((e==100)&&(i<length)) e=ctn(from[i++]);
while ((f==100)&&(i<length)) f=ctn(from[i++]);
//if (f==100) return -1; /* Not valid end */
if (c<64) {
A+=c*4;
if (d<64) {
A+=d/16;
B+=d*16;
if (e<64) {
B+=e/4;
C+=e*64;
if (f<64) {
C+=f;
to[2]=C;
add+=1;
to[1]=B;
add+=1;
to[0]=A;
add+=1;
to+=add;
if (f==80) return to-tot; /* end because '=' encountered */
return to-tot;
int b64get_encode_buffer_size(int l,int q){
int ret;
ret = (l/3)*4;
if (l%3!=0) ret +=4;
if (q!=0){
ret += (ret/(q*4));
/* if (ret%(q/4)!=0) ret ++; */ /* Add space for trailing \n */
return ret;
int b64strip_encoded_buffer(char *buf,int length){
int i;
int ret=0;
for (i=0;i<length;i++) if (ctn(buf)!=100) buf[ret++] = buf [i];
return ret;
int b64encode(char from,char to,int length,int quads){
// 3 8bit numbers become four characters
int i =0;
char *tot=to;
int qc=0; // Quadcount
unsigned char c;
unsigned char d;
while(i<length){
c=from[i];
*to++=ntc(c/4);
c=c*64;
i++;
if (i>=length) {
*to++=ntc(c/4);
*to++='~';
*to++='~';
break;
d=from[i];
*to++=ntc(c/4+d/16);
d=d*16;
i++;
if (i>=length) {
*to++=ntc(d/4);
*to++='~';
break;
c=from[i];
*to++=ntc(d/4+c/64);
c=c*4;
i++;
*to++=ntc(c/4);
qc++; /* qz will never be zero, quads = 0 means no linebreaks */
if (qc==quads){
*to++='\n';
qc=0;
/* if ((quads!=0)&&(qc!=0)) to++='\n'; / /* Insert last linebreak */
return to-tot;
char* mEncryptPassword(char* mPassword)
char mEncryptedPassword[200]; // To hold encrypted password.
//char* mEncryptedPassword = new char[200];
char mPrimEncryptedPassword[200];
char * temp = new char[200];
//unsigned char* md; // 19122003
//md = new unsigned char[100]; // 19122003
memset(mEncryptedPassword, '\0', sizeof(mEncryptedPassword));
memset(mPrimEncryptedPassword, '\0', sizeof(mPrimEncryptedPassword));
strcpy(mPrimEncryptedPassword, mPassword);
//strcpy(mPrimEncryptedPassword, (char*) SHA1((unsigned char*) mPassword, strlen(mPassword), NULL));
//strcpy(mEncryptedPassword, (char*) SHA((unsigned char*) mPassword, strlen(mPassword), md)); // 19122003
//strcpy(mEncryptedPassword, (char*) SHA((unsigned char*) mPassword, strlen(mPassword), md)); //19122003
b64encode(mPrimEncryptedPassword, mEncryptedPassword, strlen(mPrimEncryptedPassword), 0);
// If successfully encrypts..
if (mEncryptedPassword != NULL)
//char * temp = new char[strlen(mEncryptedPassword)+1];
strcpy(temp,mEncryptedPassword);
// strcpy(mRetVal,mEncryptedPassword);
return (char*)temp;
//return (mEncryptedPassword);
//return (char*) md; // 19122003
else
return ("Error");
char* mDecryptPassword(char* mPassword)
char mDecryptedPassword[200]; // To hold decrypted password.
char mPrimDecryptedPassword[200];
char * temp = new char[200];
// 02032007
memset(mDecryptedPassword, '\0', sizeof(mDecryptedPassword));
memset(mPrimDecryptedPassword, '\0', 200);
strcpy(mPrimDecryptedPassword, mPassword);
b64decode(mPrimDecryptedPassword, mDecryptedPassword, strlen(mPrimDecryptedPassword));
// If successfully decrypts..
if (mDecryptedPassword != NULL)
//char * temp = new char[strlen(mEncryptedPassword)+1];
strcpy(temp,mDecryptedPassword);
// strcpy(mRetVal,mDecryptedPassword);
return (char*)temp;
//return (mEncryptedPassword);
//return (char*) md; // 19122003
else
return ("Error");
void main(int argc, char* argv[])
cout << mEncryptPassword(argv[1])<<endl<<flush;
cout << mDecryptPassword(mEncryptPassword(argv[1]))<<endl<<flush;
Anubhavendasil wrote:
I just thought of how ridiculous this would sound in any other profession:
Surgeons:
plz plz help I have patient dying need to insert new kidney into 90yr old patient plz someone come do itLawyers:
Help client guilty need good defense (I m new in law)help urgentHow come we get stuck with the lazy low-lifes?Because there's no legal requirement that a software developer must be licensed -
New to Java and need help with error message!
I have just installed the oracle jdbc driver and am now getting the following error message when trying to use the jbdc driver instead of the jdbc:odbc wrap driver...
See com.borland.dx.dataset.DataSetException error code: BASE+47
com.borland.dx.dataset.DataSetException: Chain of 2 or more Exceptions occurred
at com.borland.dx.dataset.DataSetException.a(Unknown Source)
at com.borland.dx.dataset.DataSetException.throwExceptionChain(Unknown Source)
at com.borland.dx.sql.dataset.q.a(Unknown Source)
at com.borland.dx.sql.dataset.Database.openConnection(Unknown Source)
at com.borland.dx.sql.dataset.Database.createPreparedStatement(Unknown Source)
at com.borland.dx.sql.dataset.o.a(Unknown Source)
at com.borland.dx.sql.dataset.o.d(Unknown Source)
at com.borland.dx.sql.dataset.o.f(Unknown Source)
at com.borland.dx.sql.dataset.QueryProvider.e(Unknown Source)
at com.borland.dx.sql.dataset.JdbcProvider.provideData(Unknown Source)
at com.borland.dx.dataset.StorageDataSet.a(Unknown Source)
at com.borland.dx.dataset.DataSet.a(Unknown Source)
at com.borland.dx.dataset.DataSet.open(Unknown Source)
at com.borland.dbswing.JdbTable.bindDataSet(JdbTable.java:2749)
at com.borland.dbswing.JdbTable.setDataSet(JdbTable.java:819)
at myframes.ClaimView.btnSQL_actionPerformed(ClaimView.java:279)
at myframes.ClaimView_btnSQL_actionAdapter.actionPerformed(ClaimView.java:440)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
Chained exception:
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:640)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
at javax.naming.InitialContext.getURLOrDefaultInitCtx(InitialContext.java:280)
at javax.naming.InitialContext.lookup(InitialContext.java:347)
at com.borland.dx.sql.dataset.q.a(Unknown Source)
at com.borland.dx.sql.dataset.Database.openConnection(Unknown Source)
at com.borland.dx.sql.dataset.Database.createPreparedStatement(Unknown Source)
at com.borland.dx.sql.dataset.o.a(Unknown Source)
at com.borland.dx.sql.dataset.o.d(Unknown Source)
at com.borland.dx.sql.dataset.o.f(Unknown Source)
at com.borland.dx.sql.dataset.QueryProvider.e(Unknown Source)
at com.borland.dx.sql.dataset.JdbcProvider.provideData(Unknown Source)
at com.borland.dx.dataset.StorageDataSet.a(Unknown Source)
at com.borland.dx.dataset.DataSet.a(Unknown Source)
at com.borland.dx.dataset.DataSet.open(Unknown Source)
at com.borland.dbswing.JdbTable.bindDataSet(JdbTable.java:2749)
at com.borland.dbswing.JdbTable.setDataSet(JdbTable.java:819)
at myframes.ClaimView.btnSQL_actionPerformed(ClaimView.java:279)
at myframes.ClaimView_btnSQL_actionAdapter.actionPerformed(ClaimView.java:440)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1786)
at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1839)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:420)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:258)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:245)
at java.awt.Component.processMouseEvent(Component.java:5100)
at java.awt.Component.processEvent(Component.java:4897)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3198)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)
Here is the code causeing the error;
void btnSQL_actionPerformed(ActionEvent e)
try
String GET_DATASET = txtSQL.getText().trim();
Display("Executing...");
try
MyDisplayTable.setDataSet(null);
catch (DataSetException ex)
Display("ERROR 1: " + ex.toString());
try
queryDataSet1.close();
catch (DataSetException ex)
Display("ERROR 2: " + ex.toString());
try
queryDataSet1.setQuery(new com.borland.dx.sql.dataset.QueryDescriptor(
database1, GET_DATASET, null, true, Load.ALL));
catch (DataSetException ex)
Display("ERROR 3: " + ex.toString());
try
if (!queryDataSet1.isOpen()) {
queryDataSet1.open();
catch (DataSetException ex) {
Display("ERROR 5: " + ex.toString());
try {
queryDataSet1.refresh();
catch (Exception ex) {
Display("ERROR 5.5: " + ex.toString());
try {
Display("setDataSet");
MyDisplayTable.setDataSet(queryDataSet1);
Display("DONE setDataSet");
catch (DataSetException ex) {
Display("ERROR 6: " + ex.toString());
Display("Query: ' " + GET_DATASET.trim() + " ' was executed successfully");
catch (Exception ex)
Display(ex.toString());
Please let me know if more information is required. I am completely at a loss as to what more I need to do to get this to work using the new driver.
Thank you all in advance,
Malcolm Diaz
Application Developer
[email protected]
PlanVista Solutions Inc.
419 E.Main St.
Middletown NY 10940
845-346-2692this is more of a jdbc question rather than an internationalization. You might be able to get more help if you post it in java programming section.
-
I'm new to java and need help please
I have an assignment involves modifying a previous assignment. the code for the previous assigment is shown below.(it was required to be done as an applet this assigment can be an application or an applet) I'm trying to modify this code to read a text file (items.txt) that looks like this:
item # description price(this line does not appear in the text file)
001 shaving cream 400.00
999 razors 30.00
I need to load the item# and price from the text file into arrays(I have no clue how to use multi-dimensional arrays in java and would prefer not to)
I need to search the arrays based on the values entered by the user (item # and quantity) calculate the total for that item then create a new text file which has each line item for that order in the form:
item# quant price per item total(price per item*quant entered)
also also I need to be able to display the four items listed above after each loop as well as all the previous item number and quantities they selected until they indicate they don't want to select anymore.
I've been working on this for days and it seems like nothing I try works. My major problems are:
1. I have no idea how to read the text file and load those 2 items into their respective arrays
2. I can't seem to create a textfile that looks like text for the output file.
code]
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.Locale;
public class arraySelection
extends JApplet {
//Initialize the applet
private Container getContentPane=null;
public void init() {
String string_item, string_quantity;
String output = "";
String description= "";
int counter= 0;
int itemNumber= 0;
double quantity = 0 ;
double tax_rate=.07;
double total= 0, price= 0;
double tax, subtotal;
double Pretotal= 0;
double priceArray[] = {1, .5, 3.65, 0.02, 0.09};
String descriptionArray[] = {"salt", "pepper", "paprika", "garlic", "thyme"};
// create number format for currency in US dollar format
NumberFormat moneyFormat = NumberFormat.getCurrencyInstance( Locale.US );
//format to have the total with two digits precision
DecimalFormat twoDigits = new DecimalFormat("0.00");
//Jtextarea to display results
JTextArea outputArea = new JTextArea ();
// get applet's content pane
Container container = getContentPane ();
//attach output area to container
container.add(outputArea);
//set the first row of text for the output area
output += "Invoice\nItem#\tDescription\tQuant@Price\t Line Total" + "\n";
do //begin loop structure obtain input from user
// obtain item number from user
string_item = JOptionPane.showInputDialog(
"Please enter an item number 1, 2, 3, 4, or 5:");
//obtain quantity of each item that user enter
string_quantity = JOptionPane.showInputDialog("Enter the quantity:");
// convert numbers from type String to Integer or Double
itemNumber = Integer.parseInt(string_item);
quantity = Double.parseDouble(string_quantity);
switch (itemNumber) {//Determine input from user to assign price and description
case 10: // user input item =10
price = priceArray[0];
description = descriptionArray[0];
break;
case 20: // user input item =20
price = priceArray [1];
description = descriptionArray[1];
break;
case 30: //user input item =30
price=priceArray[2];
description = descriptionArray[2];
break;
case 40: //user input item =40
price=priceArray[3];
description = descriptionArray[3];
break;
case 50: //user input item =50
price=priceArray[4];
description = descriptionArray[4];
break;
default: // user input item is not on the list
output += "Invalid value entered"+ "\n";
price=0;
description= "";
//Calculates the total for each item number and stores it in subtotal
subtotal = price * quantity;
//display input from user
output += itemNumber + "\t" + description + "\t\t"+ quantity + "@" +
moneyFormat.format( price) + "\t" + moneyFormat.format( subtotal) + "\n";
//accumulates the overall subtotal for all items
Pretotal = Pretotal + subtotal;
//verifies that the user wants to stop entering data
string_item = JOptionPane.showInputDialog(" Enter a positive integer to continue or 0 to stop. ");
itemNumber = Integer.parseInt(string_item);
// loop termination condition if user's input is 0 .It will end the loop
} while ( itemNumber!= 0);
tax = Pretotal * tax_rate; // calculate tax amount
total = Pretotal + tax; //calculate total = subtotal + tax
//appends data regarding the subtotal, tax, and total to the output area
output += "\n" + "Order Subtotal" + "\t" + moneyFormat.format( Pretotal) +
"\n" + "Tax" + "\t\t" + twoDigits.format( tax ) + "\n" + "Order Total" +
"\t\t" + moneyFormat.format( total );
//attaches the data in the output variable to the output area
outputArea.setText( output );
} //end init
}// end applet Invoice
Any help or sugestions would be greatly appreaciated. I've been working on this for over a week and everything I try goes nowhere.item # description price(this
line does not appear in the text file)
001 shaving cream 400.00
999 razors 30.00
I need to load the item# and price from the text file
into arrays(I have no clue how to use
multi-dimensional arrays in java and would prefer not
to)That's good, because you shouldn't use multidimensional arrays here. You should have a one-dimensional array (or java.util.List) of objects that encapsulate each line.
I've been working on this for days and it seems like
nothing I try works. My major problems are:
1. I have no idea how to read the text file and load
those 2 items into their respective arrays
2. I can't seem to create a textfile that looks like
text for the output file.The java.io package has file reading/writing classes.
Here's a tutorial:
http://java.sun.com/docs/books/tutorial/essential/io/index.html -
I'm new to java and need help please(repost)
I have an assignment involves modifying a previous assignment. the code for the previous assigment is shown below.(it was required to be done as an applet this assigment can be an application or an applet) I'm trying to modify this code to read a text file (items.txt) that looks like this:
item # description price(this line does not appear in the text file)
001 shaving cream 400.00
999 razors 30.00
I need to load the item# and price from the text file into arrays(I have no clue how to use multi-dimensional arrays in java and would prefer not to)
I need to search the arrays based on the values entered by the user (item # and quantity) calculate the total for that item then create a new text file which has each line item for that order in the form:
item# quant price per item total(price per item*quant entered)
also also I need to be able to display the four items listed above after each loop as well as all the previous item number and quantities they selected until they indicate they don't want to select anymore.
I've been working on this for days and it seems like nothing I try works. My major problems are:
1. I have no idea how to read the text file and load those 2 items into their respective arrays
2. I can't seem to create a textfile that looks like text for the output file.
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.util.Locale;
public class arraySelection
extends JApplet {
//Initialize the applet
private Container getContentPane=null;
public void init() {
String string_item, string_quantity;
String output = "";
String description= "";
int counter= 0;
int itemNumber= 0;
double quantity = 0 ;
double tax_rate=.07;
double total= 0, price= 0;
double tax, subtotal;
double Pretotal= 0;
double priceArray[] = {1, .5, 3.65, 0.02, 0.09};
String descriptionArray[] = {"salt", "pepper", "paprika", "garlic", "thyme"};
// create number format for currency in US dollar format
NumberFormat moneyFormat = NumberFormat.getCurrencyInstance( Locale.US );
//format to have the total with two digits precision
DecimalFormat twoDigits = new DecimalFormat("0.00");
//Jtextarea to display results
JTextArea outputArea = new JTextArea ();
// get applet's content pane
Container container = getContentPane ();
//attach output area to container
container.add(outputArea);
//set the first row of text for the output area
output += "Invoice\nItem#\tDescription\tQuant@Price\t Line Total" + "\n";
do //begin loop structure obtain input from user
// obtain item number from user
string_item = JOptionPane.showInputDialog(
"Please enter an item number 1, 2, 3, 4, or 5:");
//obtain quantity of each item that user enter
string_quantity = JOptionPane.showInputDialog("Enter the quantity:");
// convert numbers from type String to Integer or Double
itemNumber = Integer.parseInt(string_item);
quantity = Double.parseDouble(string_quantity);
switch (itemNumber) {//Determine input from user to assign price and description
case 10: // user input item =10
price = priceArray[0];
description = descriptionArray[0];
break;
case 20: // user input item =20
price = priceArray [1];
description = descriptionArray[1];
break;
case 30: //user input item =30
price=priceArray[2];
description = descriptionArray[2];
break;
case 40: //user input item =40
price=priceArray[3];
description = descriptionArray[3];
break;
case 50: //user input item =50
price=priceArray[4];
description = descriptionArray[4];
break;
default: // user input item is not on the list
output += "Invalid value entered"+ "\n";
price=0;
description= "";
//Calculates the total for each item number and stores it in subtotal
subtotal = price * quantity;
//display input from user
output += itemNumber + "\t" + description + "\t\t"+ quantity + "@" +
moneyFormat.format( price) + "\t" + moneyFormat.format( subtotal) + "\n";
//accumulates the overall subtotal for all items
Pretotal = Pretotal + subtotal;
//verifies that the user wants to stop entering data
string_item = JOptionPane.showInputDialog(" Enter a positive integer to continue or 0 to stop. ");
itemNumber = Integer.parseInt(string_item);
// loop termination condition if user's input is 0 .It will end the loop
} while ( itemNumber!= 0);
tax = Pretotal * tax_rate; // calculate tax amount
total = Pretotal + tax; //calculate total = subtotal + tax
//appends data regarding the subtotal, tax, and total to the output area
output += "\n" + "Order Subtotal" + "\t" + moneyFormat.format( Pretotal) +
"\n" + "Tax" + "\t\t" + twoDigits.format( tax ) + "\n" + "Order Total" +
"\t\t" + moneyFormat.format( total );
//attaches the data in the output variable to the output area
outputArea.setText( output );
} //end init
}// end applet InvoiceAny help or sugestions would be greatly appreaciated. I've been working on this for over a week and everything I try goes nowhere.First answer: You shouldn't ask multiple questions in the same thread. Ask a specific question, with an appropriate subject line (optionally, assign the number of Dukes you are willing to give for the help). When question #1 is answered and question #2 arises, it's time for a new thread (don't forget to give out Dukes before moving on).
Second answer: I think you need a Transfer Object (http://java.sun.com/blueprints/patterns/TransferObject.html). It's whole purpose is to hold/transfer instance data where it is needed. Create a class something like this:
public class ItemTO
private String _number;
private String _description;
private double _price;
public ItemTO( String number, String description, double price )
_number = number;
_description = description;
_price = price
// Getter/Setter methods go here
}then, in the code where you read in the file do something like this:
BufferedReader input = null;
try
input = new BufferedReader( new FileReader( "c:\\a.txt" ) );
List items = new ArrayList();
String line;
String itemNumber;
String itemDescription;
double itemPrice;
while ( (line = input.readLine() ) != null )
System.out.println( line );
itemNumber = // Parse it from line
itemDescription // Parse it from line
itemPrice = // Parse it from line
items.add( new ItemTO( itemNumber, itemDescription, itemPrice ) );
catch ( FileNotFoundException fnfe )
fnfe.printStackTrace();
catch ( IOException ioe )
ioe.printStackTrace();
finally
try
if ( input != null )
input.close();
catch ( Exception e )
e.printStackTrace();
}As for how to parse the line of the file, I'll leave that to you for now. Are the three values delimited with any special characters?
jbisotti -
I am new to java and need help to
how can i read a class-file
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class Capitalizeapplet extends Applet {
private TextField input;
private TextField output;
public void init() {
input = new TextField(40);
output = new TextField(40);
output.setEditable(true);
Button b= new Button("Capitalize");
this.add(input);
this.add(b);
this.add(output);
CapitalizerAction ca=new CapitalizerAction(input,output);
b.addActionListener(ca);
this.input.addActionListener(ca);
class CapitalizerAction implements ActionListener
private TextField in;
private TextField out;
public CapitalizerAction(TextField in,TextField out)
this.in=in;
this.out=out;
public void actionPerformed(ActionEvent ae)
String s=in.getText();
out.setText(s.toUpperCase());
at any time man, we are in service
(it's my first time to answer someone, coz I'm biggener exactly like u!...but I took that lesson ;) -
I am new to Java. Need help-urgent
I need to write a java program that reads a text input and outputs it one word per line. Also, print the total number of words in the inputtext. I am not allowed to use a StringTokenizer object. Could you please tell me how to do it?
Thankscopy the string you read in to a char[] then
use a for loop to iterate through the array using print instead of println to write out each letter
once you come to a space use println. -
Java help needed-Inventory System
I urgently need help in finishing my java inventory project for school. Can anyone help me usin files and streams to get the program to save data and help me get the menu to work pls THANKS> Heres the source code below:
// TextForm.java
// A simple label/field form panel
import javax.swing.*;
import java.awt.event.*;
import java.awt.*;
public class TextForm extends JPanel {
private JTextField[] fields;
// Create a form with the specified labels, tooltips, and sizes.
public TextForm(String[] labels,
int[] widths, String[] tips) {
super(new BorderLayout());
JPanel labelPanel = new JPanel(new GridLayout(labels.length, 1));
JPanel fieldPanel = new JPanel(new GridLayout(labels.length, 1));
add(labelPanel, BorderLayout.WEST);
add(fieldPanel, BorderLayout.CENTER);
fields = new JTextField[labels.length];
for (int i=0; i < labels.length; i+=1) {
fields[i] = new JTextField();
if (i < tips.length) fields.setToolTipText(tips[i]);
if (i < widths.length) fields[i].setColumns(widths[i]);
JLabel lab = new JLabel(labels[i], JLabel.RIGHT);
lab.setLabelFor(fields[i]);
labelPanel.add(lab);
JPanel p = new JPanel(new FlowLayout(FlowLayout.LEFT));
p.add(fields[i]);
fieldPanel.add(p);
JScrollBar JScrollBar = new JScrollBar();
JScrollBar vbar = new JScrollBar(JScrollBar.VERTICAL, 30, 40, 0, 300);
add(vbar, BorderLayout.EAST);
public String getText(int i) {
return( fields[i].getText() );
public static void main(String[] args) {
String[] labels = { "115ml Medicine", "236.60ml Water-clear", "236.60 Water-Amber", "250ml Irish Moss",
"250ml Sauce", "355ml Water", "380ml Juice", "473ml Vinegar", "500ml Water", "500 ml Blue Water", "600ml Water",
"750ml Syrup/honey", "900ml Disinfectant", "1000ml Syrup", "1500ml Water", "Total # caps:" };
int[] widths = { 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12 ,12 };
String[] descs = { "", "Enter Quantity" };
final TextForm form = new TextForm(labels, widths, descs);
JButton submit = new JButton("Save Inventory");
JButton cancel = new JButton( "Cancel");
submit.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JOptionPane.showConfirmDialog(null,"Are you sure you want to save this record?");
JOptionPane.showMessageDialog(null, " Inventory status updated");
JOptionPane.showConfirmDialog(null, "Do you want to exit?");
JFrame f = new JFrame("Sweet Inventory System");
f.getContentPane().add(form, BorderLayout.NORTH);
JPanel p = new JPanel();
p.add(submit);
f.getContentPane().add(p, BorderLayout.CENTER);
f.pack();
f.setVisible(true);
Its error free except i cant see the menubar or get it to save items usin files and streams.
HELP PLEASETELL ME THE CODE I CAN USE TO MAKE IT SAVE ITEMS LIKE
IN A TEXT FILE AND HOW CAN I ATTACH IT TO THE SAVE
BUTTON USIN A LISTENER
THANKS
PLS POST HEREPosts like this make me ignore you forever. -
Psuedocode to java. help needed if poss
i need to convert the following into java, but i am not sure how to output it..
Roll a 12 sided die to choose a number between 1...12
while the user has not made an incorrect guess
ask the user if the next number will be higher or lower
choose random number
if users guess is correct
increment count of correct guesses
update the stored current number
end if
end while
tell the user how many correct guesses there are
any help would be greatful, i am a beginning so go easy!!!
thanks alot
steviehey, sorry if i've caused a 'cross post', i am not too sure what it is but i hope i haven't done anything wrong! so far i am just trying to put a basic program together before building on it..
import java.util.scanner;
public class dice
public static void main (String [] args)
Scanner in = new Scanner(System.in);
Random rnd = new Random();
System.out.print("input a number between one and twelve") int r =in.nextInt;
int r = rnd.nextInt(12) + 1;
System.out.println(r);
i know this has errors, but i was just hoping for a hint/clue for the basic program before researching more to build on it.. hope this code will help. reply when you can, thank you very much
stevie -
I feel like a complete novice for posting this kinda stuff, but i figured somebody would take 5 minutes and help me out. My final in my programming class depends on 2 programs, one of which is giving me some actual trouble.
What I have to do is create a java applet that allows a user to input their weight, select a planet, and then have their weight converted to what their weight would be on the selected planet. However, if the ouput is higher than 60 pounds, I need a picture of the michelin man to appear and the theme from star wars to play. If it is below 60, A multicolored asterisk should be displayed with applause.
I will post what code I have already made. Please note: ITS VERY VERY BASIC. I may have overcomplicated some things, and there is always more than one way to do something (in my experience). Also, I kinda just converted a temperature conversion applet, so there may be some extra stuff I don't need.
Please help.
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class tempsapp2 extends Applet implements ActionListener
Label prompt1;
TextField input1;
Label prompt2;
TextField input2;
int number1, number2;
int mercury, venus, earth, mars, jupiter, saturn, neptune, uranus, pluto, result;
public void init()
prompt1 = new Label ("Enter your weight:");
add (prompt1);
input1 = new TextField (10);
add (input1);
prompt2 = new Label ("Enter the Number of the Planet you would like to have your weight converted to:");
add (prompt2);
input2 = new TextField (10);
add (input2);
input2.addActionListener(this);
add (input2);
public void paint (Graphics g)
number1 = Integer.parseInt(input1.getText());
number2 = Integer.parseInt(input2.getText());
mercury = (number1*3780)/1000;
venus = (number1*9070)/1000;
earth = (number1*10)/1000;
mars = (number1*3770)/1000;
saturn = (number1*9160)/1000;
uranus = (number1*8890)/1000;
neptune = (number1*1125)/1000;
jupiter = (number1*2364)/1000;
pluto = (number1*670)/1000;
if(number2==1)
g.drawString("Your weight on Mercury would be "+mercury+" lbs",100,150);
else if(number2==2)
g.drawString("Your weight on Venus would be "+venus+" lbs",100,150);
else if(number2==3)
g.drawString("Your weight on Earth would be "+earth+" lbs",100,150);
else if(number2==4)
g.drawString("Your weight on Mars would be "+mars+" lbs",100,150);
else if(number2==5)
g.drawString("Your weight on Jupiter would be "+jupiter+" lbs",100,150);
else if(number2==6)
g.drawString("Your weight on Saturn would be "+saturn+" lbs",100,150);
else if(number2==7)
g.drawString("Your weight on Uranus would be "+uranus+" lbs",100,150);
else if(number2==8)
g.drawString("Your weight on Neptune would be "+neptune+" lbs",100,150);
else if(number2==9)
g.drawString("Your weight on Pluto would be "+pluto+" lbs",100,150);
public void actionPerformed(ActionEvent evt)
number1 = Integer.parseInt(input1.getText());
number2 = Integer.parseInt(input2.getText());
repaint();
}I am guessing that you are wondering where to go from here. If so http://java.sun.com/products/plugin/1.5.0/demos/applets/Animator/Animator.java may prove helpful.
Also I would recommend using arrays of planet names and weight multipliers. It could make your code a lot less cumbersome. -
I have a Question for all you gifted people:
I am designing a sort of quiz which takes questions and three possible answers from a database(which also holds the real answer).It prints these on the dos screen and I then have a System.in statement which allows the user to enter his or her answer (eg A,B,C or 1,2,3). I need a way of adding up the score at the end!!I was thinking of storing there answers in an array and compairing there answer to my correct answer in the database and if it is the same add 1 and if it not the same add 0???
How would i write the System.in answers into an array and add them up???
These are my thoughts on how to do this i would love to hear yours!! And also a help with writing the code for the above system of scoreing would be GREATLY appriciated!!
thanks everyone,
james.As mathuoa pointed out, since you already display the 3 possible answers to the user, get them into an array and display them on the screen. Then, as the user enters an answer, compare them with the three answers and if it is correct, update the score variable as such. If you want the history of answers that the user has given, then u will have to use a Vector/List/some such collection object to hold the user's answers.
java.util.Vector answers = new java.util.Vector();
answers.add(usersAnswer1);
answers.add(usersAnswer2);
Then, to get the entries,
for(Enumeration e = answers.elements(); e.hasMoreElements();)
System.out.println(e.nextElement());
//Do something with the answer.
This is one possible way of getting the answers from the user! -
Pdf showed in new window. Help needed!
Hi all,
This is my first post (but a thousand read), and i want first to thank you all for all the information i have read in this forums for years.
I have a problem which is giving me more problems that i expected. In my webapp, i want to show a pdf document in a new page of the navigator when a button is pressed. I have discarded the target blank option in the container form because i have others buttons and dont want them to be opened in new windows, just the one that open the pdf.
So, I used another navigation rule to open a new window. This page have to make de pdf in code an send it to the client. I dont know how to execute that code on the load of the page.
The solution i am trying is using a poll that only will be called once and in the pollListener execute that code. The problem is that does not work to send the response to the client in the client. Here is the code of the pollListener:
byte[] file; //Don't worry about it. Contains the file pdf i want to show.
FacesContext fctx = FacesContext.getCurrentInstance();
HttpServletResponse response =
(HttpServletResponse) fctx.getExternalContext().getResponse();
response.setContentType("application/pdf");
response.setHeader("Content-Disposition",
"inline; filename=\"file.pdf\"");
response.setHeader("Cache-Control", "no-cache");
response.setContentLength(file.length);
ServletOutputStream sos = response.getOutputStream();
sos.write(fichero);
sos.flush();
sos.close();
fctx.responseComplete();
The curious thing is that if i change the content-disposition to atachemement instead inline, it works asking me to download the file, however, i want it to open directly in the new window and is because of that i use content-disposition inline.
I am almost killing myself because of this problem. Anyone can help me?
Thanks in advance!First of all, you don't need to do this with a workaround using a Poll listener. I assume that one page has a commandButton or commandLink that is used to show the PDF, right?
Set the useWindow property of the button or link to "true".
Set the actionListener property of the button or link to a method in a backing bean that looks something like this:
public void showPDF(ActionEvent actionEvent) throws IOException {
//Setup the output
String contentType = "application/pdf";
FacesContext fc = FacesContext.getCurrentInstance();
HttpServletResponse response =
(HttpServletResponse)fc.getExternalContext().getResponse();
/* Notice that I don't set the Content-Disposition header - inline is default. */
response.setContentType(contentType);
ServletOuputStream out = response.getOutputStream();
/* Do whatever you need to do to write the pdf to "out" here. */
out.flush();
out.close();
fc.responseComplete();
} -
Calling perl script from java ---help needed
I haven't been doing a lot with java lately and i'm building an app with netbeans and having some difficulty with my button calling an outside perl script I'm pasting the code and error below...any help would be greatly appreciated. It's running on fedora 9 pretty much default install...
thanks.
code:
Runtime r = Runtime.getRuntime();
Process p = null;
String s = null;
String cmd123[] = { "perl /home/deaddev/test1.pl" };
try {
p = r.exec(cmd123);
catch {
foo bar/etc/etc
error:
Oct 12, 2008 4:09:37 PM photomainmgr readToPerlActionPerformed
SEVERE: null
java.io.IOException: Cannot run program "perl /home/deaddev/test1.pl": java.io.IOException: error=2, No such file or directory
at java.lang.ProcessBuilder.start(ProcessBuilder.java:474)
at java.lang.Runtime.exec(Runtime.java:610)
at java.lang.Runtime.exec(Runtime.java:483)
at photomainmgr.readToPerlActionPerformed(photomainmgr.java:117)
at photomainmgr.access$000(photomainmgr.java:21)
at photomainmgr$1.actionPerformed(photomainmgr.java:54)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2012)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2335)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:404)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:253)
at java.awt.Component.processMouseEvent(Component.java:6101)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3276)
at java.awt.Component.processEvent(Component.java:5866)
at java.awt.Container.processEvent(Container.java:2105)
at java.awt.Component.dispatchEventImpl(Component.java:4462)
at java.awt.Container.dispatchEventImpl(Container.java:2163)
at java.awt.Component.dispatchEvent(Component.java:4288)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4461)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4125)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4055)
at java.awt.Container.dispatchEventImpl(Container.java:2149)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4288)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)
Caused by: java.io.IOException: java.io.IOException: error=2, No such file or directory
at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
at java.lang.ProcessImpl.start(ProcessImpl.java:81)
at java.lang.ProcessBuilder.start(ProcessBuilder.java:467)
... 30 more
error executing perl /home/deaddev/test1.pljschell wrote:
sabre150 wrote:
As and alternative you can useString cmd123 = "perl /home/deaddev/test1.pl";Using the single string approach YOU have to do any quoting so with this line no quoting takes place and the script /home/deaddev/test1.pl will be executed.Although that should be true apparently it isn't. I have just run
Process p = Runtime.getRuntime().exec("perl /home/sabre/work/dev/perl/xxx.pl");
new Thread(new SyncPipe(p.getErrorStream(), System.err)).start();
new SyncPipe(p.getInputStream(), System.out).run();
int returnCode = p.waitFor();
System.out.println("Return code = " + returnCode);which correctly executes the perl script xxx.pl.
P.S. SyncPipe is a Runnable that copies an InputStream to an OutputStream.
Edited by: sabre150 on Oct 14, 2008 9:19 AM
Interesting! Even though Runtime.exec() works with a single String, ProcessBuilder fails with this approach! You have to split the argument string. This certainly looks like a bug! Some while ago I looked at the source for Runtime.exec() to look at the differences between Runtime.exec() and ProcessBuilder and found that behind the scenes Runtime.exec() uses ProcessBuilder.
More research is required.
Maybe you are looking for
-
Hi all, I have an ipod classic 30gb which is about 2-3 years old. I can get mv4 files to sync with the ipod but when I try to sync mp4's I get an error message stating something along the lines of 'this file is not supported on this ipod'. I can watc
-
When Apple TV Starts it starts playing Itunes too
I have a brand new Mac Mini running LIon. I have a Apple TV 2 on a LG 32 inch LED TV . When I start Apple Tv and go to the menu and click on a menu my Itunes starts playing a song. So when I am watching a movie or a podcast on my Apple TV ..
-
i just bought a stand alone DSL modem and a TC. got the net working directly wired through the modem, and even got TC set up to give me a solid green light. got it updated and everything, but still cant get online when wired or wireless connected to
-
I'm looking at a couple options for a small network in a data center. I seem to be getting hung up on all the different options. One of the options I'm looking at is end or row using both 2960Ss and Blade Center chassis switches with each physical
-
Keyboard issues after recent update
so last week I updated my iPad 2 to the newest update ... After that my iPad is unstable and constantly crashes ...and the worst of it is the keyboard pops up and covers where I'm typing , so I cannot see what I'm typing or being able to correct it