Could Not Open / Create Prefs Warning

Jan 3, 2015

What does this error mean, and also, when I get it, the command line hangs so that I can't do anything else (Is there a way to recover from that?). I'm running Windows 7.

Jan 03, 2015 5:00:59 AM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node SoftwareJavaSoftPrefs at root 0
x80000002. Windows RegCreateKeyEx(...) returned error code 5.

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Cannot Create Prefs Warning On Windows

Jun 12, 2014

When I run the following code from Java HeadFirst, everything goes fine but along with one error ( i don't know is it an error or exception, or some other windows stuff). The code is

import javax.sound.midi.*;
class ExceptionHandling {
public static void main(String[] args){
ExceptionHandling o = new ExceptionHandling();
o.play();

[Code] ....

And what I got on cmd ( I am using Windows 7) :

Jaspreet javac ExceptionHandling.java
Jaspreet java ExceptionHandling
Jun 11, 2014 5:19:40 PM java.util.prefs.WindowsPreferences <init>
WARNING: Could not open/create prefs root node SoftwareJavaSoftPrefs at root 0
x80000002. Windows RegCreateKeyEx(...) returned error code 5.

We got the sequencer

What is meant by code in blue? I know its some message from windows os and not from jvm. but i didn't understand it.

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Create A Jar File That Would Open 3 Other Jar Files

Jan 13, 2015

I was just wondering how would I create a jar file that would open 3 other jar files when I open the jar file with my batch file it and when I type stop in the batch file it will out put the stop command into all 3 of the other jar files.

This is for my Minecraft server so I can launch them all at the same time and inStead of having to enter the commands in all the server batch files I just have to do the command in 1 I know their is things like multi craft to do this but I want the code so I don't have to use multicraft.

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Create Multiple PDF Files And Open Them At Once From Java Application

Aug 30, 2014

I am using itext to create pdf files , i have filtered some records (preferably i can say around 90) which has the option to open pdf for individual record. Now I need to open all the pdf's of filtered records on a single click , without asking for a open dialogue box. How to go about this ??

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Warning For Not Overriding Methods

Mar 26, 2014

import javax.swing.*;
import java.awt.*;
import javax.swing.event.*;
import java.awt.event.*;
/* display selected number
if selected, bg is green
if not selected bg is pink
*/

[code]....

my compiler is telling me that the getList... method is not being overridden.but when I change the JList<String> to JList and Object to String in the parameters, i get a warning from the compiler that it's an "unchecked call".

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Compiler Does Not Show Any Warning Or Errors

May 18, 2014

public void init(Board board) {
JPanel Panel = new JPanel();
Panel.setLayout(new GridLayout(board.getWidth(), board.getHeight()));
getContentPane().add(Panel, BorderLayout.CENTER);
Panel.setBorder(new LineBorder(Color.BLACK)); // it does not work also
 
[code]....

I have a JFrame. I added two JPanels to the JFrame. The first one is GridLayout and it should be situated at CENTER. Another one is bottomPanel, and that one should be situated at SOUTH.I would like to add two new JPanels(kit and another one) to the bottomPanel.Compiler does not show any warning or errors.The problem is, that bottomPanel situates at NORTH, not at SOUTH. kit situates at CENTER of bottomPanel, not at WEST.

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Error And Dead Code Warning

Mar 26, 2015

There are 2 methods and a main one. The first is a void that creates a 3x4 2d array and the second is to search for a value in the array, if found it will return the number of the row that contains that value. If not, it will return -1, but I am getting 1 error and 1 dead code warning.I will put comments at the lines that contain the problems

import java.util.Scanner;
class Question4{
public static void main(String[]args){
Scanner s = new Scanner(System.in);
int x,n;
System.out.println("Please input the value that will be used in the array");
x=s.nextInt();
System.out.println("What is the value you want to search for?");
n=s.nextInt();
createArray (x,n);

[code]....

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Warning On Class With JFrame Inheritance (extends)

Sep 2, 2014

I'll start off by showing my full code:

Main class

import javax.swing.JFrame; 
public class groupingTest {
public static void main (String[] args) {
groupWindow test = new groupWindow();

[Code]....

At the start of the groupWindow it turns yellow and it says "The serializable class groupWindow does not declare a static final serialVersionUID field of type long".

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Trying To Add Database Driver (JDBC) - Not In CLASSPATH Warning?

Jun 23, 2015

This the output of java from my PC under linux platform (rhel 6.5).
 
[pentaho@vertica-srv1 Downloads]$ java -version
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)
 
[Code] ....
 
But the problem is while trying to open ETL program under linux platform [pentaho@vertica-srv1 data-integration]$ ./spoon.sh .... I received the following error messages.
 
[pentaho@vertica-srv1 data-integration]$ ./spoon.sh
 
Trying to add database driver (JDBC): RmiJdbc.RJDriver - Warning, not in CLASSPATH?
Trying to add database driver (JDBC): jdbc.idbDriver - Warning, not in CLASSPATH?
Trying to add database driver (JDBC): org.gjt.mm.mysql.Driver - Warning, not in CLASSPATH?
Trying to add database driver (JDBC): com.mckoi.JDBCDriver - Warning, not in CLASSPATH?
[KnowledgeFlow] Loading properties and plugins...

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Warning While Using Boolean Datatype In Program Execution Success

Oct 26, 2014

I am getting notification about "The value of the local variable result not used" in my program when i am using boolean data type.But code execution was successful. Results are also displayed accurately.I am using Eclipse, there i i have noticed this warning.

* program to practice about comparison operators */
public class compoperators {
public static void main(String[] args) {
boolean result;
}

[code]....

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Why Server Cannot Produce Same Warning Message Compared To Local Deployed Project

Feb 26, 2014

I have a question: I have a Java/JSP/JavaScript project that access back end Oracle database, and provide interaction through tomcat. After we deployed our project, I found one button does not generate necessary warning message from server, but when I deployed and tested our project on local PC, it does generate correct warning message. I am using the same IE, same tomcat version, and I am sure my container is pointing to the same database, and I am sure I using same version of project code by checking with GIT.
 
Here is the button that I click:

<a target="frmMain" href="RealignServlet?button=REALIGNMENT" title="Procedure Alignment">Align</a><br> 

And here is part of the code of RealignServlet:
 
    public class RealignServlet extends SiapBaseServlet { 
    private static final long serialVersionUID = 1L;
    private static final Logger logger = AppLogger.getLogger(RealignServlet.class.getName());
    private static final String PROC_QUERY_JSP = "ProcQuery.jsp";
    private static final String REALIGN = "REALIGNMENT";
 
[Code] .....
 
Our problem is server could not generate alignMsg. But we can get it on local deployed project.

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How To Open J2SE SDK

Jan 27, 2014

I downloaded JDK 7 file. But, I don't know how to use it. First of all, I even don't know how to open it.

There are some files in 'Java development kit', and the one I can play with is 'Java mission control'.

But it looks strange to me...and it looks it is not the way.. I want to compile files but, I can't find how to open java compiler.

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Swing/AWT/SWT :: Open GUI On Top Of Another GUI

Feb 12, 2014

how to open a GUI on top of another GUI? I have built a GUI and have a button that when pressed I want to open a new GUI which is another java application within the project, it seems pretty straight forward and I just need to insert 'new [name of application]()'

Button btnEdit = new Button(shell, SWT.NONE);
btnEdit.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
new edit();
}
});
btnEdit.setBounds(76, 10, 75, 25);
btnEdit.setText("Edit");

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Swing/AWT/SWT :: How To Open Another GUI With A Button

Apr 8, 2014

I'd like open a second GUI when I press a button that's on the first GUI, like a link in a website.

What I want to do is:

1- Open GUI_1;

2- Press a button on GUI_1; this button close GUI_1 and open another GUI (GUI_2).

How can I do it?

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Cannot Open Jar File In Eclipse

Feb 27, 2015

i have an older file I was working on 2 months ago and when i try to open it in eclipse I get a message corruption error. I know this is not possible since I was just working on it a while back, and it's the same program version as what i am currently using..Or would I do a file import instead?

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EJB / EE :: GenericJDBCException - Could Not Open Connection

Oct 3, 2014

I am new to EJB; I am writing EJB (3.1) program in JBoss 7.1 - I am using MySQL DB with JPA. While executing the program, I am facing the Generic JDBCException: Could not open connection. It is happening only for certain tables in the database; but NOT for all tables. My code is able to access few of the tables in the same database. Here is my full stack trace: -

Exception in thread "main" javax.ejb.EJBException: javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Could not open connection
at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:166)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:230)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:304)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:190)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288)

[code]....

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JSP / JSTL :: How To Open CHM File

Sep 13, 2012

Is there a way we can open a .chm file stored at server through jsp application without downloading the file and saving it to the local machine.

What I googled is : we cannot download .chm files from a web browser and simply click Open.  Download the .chm file to your computer first, right-mouse click it in Windows Explorer and select Properties.  Then click Unblock.

But I want my users to simply view the file without downloading it.

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How To Open Random Input File

Oct 30, 2014

i dont know how to write main that would open the input file and read using this method...

[/package AssignmentSeven;
import java.io.*;
import java.util.Scanner;
public class Assignment7
{
public static void Towers(int nTowers, int fromTower1, int workTower2, int toTower3) {
if(nTowers == 1)

[code].....

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Attempting To Open URL With Browser In Kubuntu?

Jan 24, 2014

In Windows and Mac both, the following code works wonders:

Java Code: // openURL called from another method
openURL("http://www.google.com");
private void openURL(String URL)
{

[Code].....

The only OS I can get this to work on is Kubuntu or even Ubuntu for that matter.

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JavaFX 2.0 :: How To Open PDF On Button Click

Jul 15, 2015

I'm using java FX-8 and JDK 1.8,Netbeans 8.0.2.I want to open pdf on button click in my JavaFXML Application.I have triued pdf viewer plugins and iText but it doesn;t work.I have to pass variable value in pdf too.

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JDBC :: Open Connection String

Jun 25, 2015

What I have in my tnsnames.ora and verify it all works via sqlplus
 
CDB1 =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = 0.0.0.0)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = cdb1)
 
[Code] ....
 
I am trying to get RJDBC to work so I can connect to Oracle from R doing some data analysis..
 
This connection string works for my local db which I have it running in my Virtual Box
 
con <- dbConnect(drv, "jdbc:oracle:thin:@//localhost:1521/orcl", "demo", "demo")
 
However, it does not work when I do it for the remote db that I really need to pull data from...
 
> con <- dbConnect(drv, "jdbc:oracle:thin:@//ymsdbppr-scan:1522/YMQCTPRD", "user_read", "user_read")

Error in .jcall(drv@jdrv, "Ljava/sql/Connection;", "connect", as.character(url)[1],  :
  java.sql.SQLException: Listener refused the connection with the following error:
ORA-12514, TNS: listener does not currently know of service requested in connect descriptor

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How To Make Sure Only One Particular Type Of Instance Is Open At A Time

Feb 23, 2015

This isn't asking to make a Singleton, where I want only one type of a type of window period.

It's not where I want only one instance of the program itself open at a time. It's more along the lines of, though I don't care if there is more than one Microsoft Word open at the same time, I don't want more than one instance of blablabla.docx to be open at once.

In other words, I'd need to scan my system or my list of open windows of a particular type to make sure that no two ones where equals is true will match up.

I was going to do it to associate it with a particular name with a window (it's sort of an addressbook, though not quite.) I'd use a JFrame subclass to make these windows that have a name go with them. For now, unless I find the great need for this project that there might be someone with the exact same name around here, I'm going to use equals() with name on this. I can type cast and whatnot.

However, how do I get to know what windows are open at once so I can check all my list of open windows, and I'd prefer to check only ones of certain types, though I may have to check them all indirectly perhaps, before I check the names.

I'm wondering is it a getChildren() of the main window or something else? How do I know what all of my open windows are?

I'd prefer to have to check as few as possible and not have to check unnecessary ones.

As for the structure of my thing that would click that would open the new window, I'm not sure yet. I'm almost leaning JLabel, though it's a bit less sophisticated, as it might be more difficult to add to a JList (maybe I"m wrong on thinking on that. It's been a little while since I last worked with JLists.)

(I think I can set list data, but the problem is, even using an ArrayList, it only takes an array for this as a param and ArrayList returns an Array of type Object, which means a lot of pesky type casting every time just to add or remove a name.)

It does have Vector, but I thought Vector was being phased out.

Anyway, without having too much code given, as I'm not sure how I'll set this up yet, how do you get access to all of the windows being opened to be able to check them for certain traits?

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Change Default JRE Browser Uses To Open Applets

Mar 4, 2014

I have Java 6 and Java 7 installed, if i open an applet in any browser it uses the dll's and from the jre7 folder. I would like it to use the jre6 folder, without uninstalling java7. I tried doing this through the java control panel by adding jre6, checking it as enabled and checking off jre7. It didn't make any diffrence.

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Swing/AWT/SWT :: Child Window Doesn't Open

Mar 23, 2014

sale s = new sale();
jDesktopPane1.add(s);
s.show();

says not a suitable method?

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Code To Open Up TXT File And Display Only First Five Lines?

Apr 7, 2013

I am trying to write a java code for a homework problem in my intro java class but im having problems. This is the problem:

Write a program that open the MyFile.txt and read from a file with these criteria.

1)-The program should display the first five lines of the file’s contents only.

2)-If the file contains less than five lines, it should display the file’s entire content. You must check for end of file and less than 6 lines on the loop iterations.

3)- your program should use loop to read the line by line of the file MyFile.txt.

The serperate myfile.txt has this

I can still remember, at the end of that year, we sat for the last time in our circle together. She played us her favorite song, "like a bridge over troubled water" and quietly passed out a gift she had made for each of us.She had made each of us a pottery heart with our name and the date on it on the back each read "I believe in ME".We all cried including her. She told us she would always remember US. We believed she would.

and this is what the code is suppose to look like after you run it : Java33.png

And this is what i have so far : Java22.png

what needs to go next to complete the javascript to show the first 5 lines of the text files?

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How To Open Files When In Classes Instead Of Main Code

Mar 18, 2014

I have looked over other people code relating to files that are related to my actual studies in class. My teacher hasn't worked on a lot of file problems so I want to gain some understanding on it.

1.) I have this class with variables declared

import java.io.*;
public class FileDisplay {
private String filename;
FileWriter outputfile;
File Inputfile;

I'm aware that having a private variable would not allow that variable to be accessed outside the code. Vice versa, public variable would do that. The FileWriter and the File Inputfile is something I don't understand, especially have them in classes. What is the purpose of them?

2.)

public class FileDisplay {
private String filename;
FileWriter outputfile;
File Inputfile;
 
[Code] ....

I have made this code here that opens the output and input file. If I make another method, how would I display the text onto that same file. Hard to clarify for me, but in each method do I just keep creating :

FileWriter outputfile=new Filewriter(filename)

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