java-programmer >>GUI program locking up...

GUI program locking up...

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- 1
 - how to mail a form in JSPhi this is ravin. i m a last year IT student and i am doing my project
 at a govt. organization. i have to do one thing in my project that:
 > there is a feedback form which is to be filled by any user.
 > it is having four fields.
 1) name
 2) tel.no
 3) e-mail address
 4) comments
 > i simply have to mail this fields to the org.'s mail address when user hits submit button. there is nothing to do with this fields.
 
 please send releated help as early as possible.
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 " Open source is just about old style client software
 catching of to the Web economy "
 
 You obviously don't believe that yourself ,
 otherwise you'd be using Google ... Not Moz .
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 String. The other part of my assignment was to read a file and return its
 contents. I did that with the following code:
 
 private String filename;
 private String contents;
 public TextFileReader(String aFileName){
 
 filename = aFileName;
 
 }
 
 public String readText() throws IOException{
 
 String lineSep = System.getProperty("line.separator");
 BufferedReader input = new BufferedReader(new
 FileReader(filename));
 String nextLine = " ";
 StringBuffer contents = new StringBuffer();
 
 while((nextLine = input.readLine()) != null){
 contents.append(nextLine);
 contents.append(lineSep);
 }
 
 return contents.toString();
 
 }
 
 ----------
 
 So, what do I have to change to be able to read webpages?
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 Simplifying i have a java help set as this
 
 ROOT -> C
 -> B -> b1
 -> b2
 -> b3
 ->C
 
 I can set B as current visualized node with these instructions:
 helpBroker =(DefaultHelpBroker)coreHelpSet.createHelpBroker();
 helpBroker.setCurrentID(B);
 
 my problem is that i'd like to hide the other nodes setting B as tree
 root node so that i could only see B and its children b1,b2,b3.
 This is because entire help set is recovered from a big manual
 describing a lot of applications and i'd like to show only one referred
 by node B avoiding to show others that couldn't be installed.
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 thanks
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 i am trying to set rowheight of row in a JTable using
 setRowHeight(row,rowheight)
 
 it is not affecting on Table.but if i use setRowheight(rowheight) it
 applying
 
 entire table ,please help me to solve this problem
 
 after setRowHeight(row,rowheight), i am calling firechanged() method
 also ,i t will not affecting please hemp me
- 4
 - Problem in connecting to a proxyHi,
 i need to see if a user enters the correct username/password to
 authenticate to a proxy. My problem is... through the following code,
 i am
 able to connect to a proxy with even invalid username/passwords.
 Suppose
 if the valid username and password to a proxy is test/test , i am able
 to connect to the proxy using x/x . the response code returned is
 always 200. Please advice..
 
 ################################
 
 public static boolean isValidProxyAccount(String proxyServer,String
 proxyPort,String proxyLogin,String proxyPassword) throws IOException
 {
 String go_url = new String ("http://www.google.com/");
 boolean VALID_STATUS = true;
 
 try{
 URL url = new URL(go_url);
 
 System.getProperties().put("proxySet",
 "true");
 System.getProperties().put("http.proxyHost", proxyServer);
 System.getProperties().put("http.proxyPort", proxyPort);
 
 HttpURLConnection con = (HttpURLConnection)
 url.openConnection();
 Base64Encoder b1 = new
 Base64Encoder(proxyLogin+":"+proxyPassword);
 con.setAllowUserInteraction(true);
 String enStrProxy = "Basic "+ b1.processString();
 con.setRequestProperty("Proxy-Authorization", enStrProxy);
 
 int code = con.getResponseCode();
 String retMsg = con.getResponseMessage();
 
 System.out.println("code::"+code);
 System.out.println("retMsg::"+retMsg);
 
 System.getProperties().put("proxySet", "false");
 System.getProperties().remove("http.proxyHost");
 System.getProperties().remove("http.proxyPort");
 
 con.disconnect();
 
 if (code != 200){
 VALID_STATUS = false;
 throw new IOException("Failed to connect to CCO: "+retMsg);
 }
 }catch (Exception ex){
 System.out.println(ex.getMessage());
 throw new IOException(ex.getMessage());
 }//catch
 return VALID_STATUS;
 }
- 6
 - JacOrb Multihomed serverHi everybody,
 
 we have problems running a corba-server on a multi-homed Win2k-Box.
 The machine has two network-cards. JacOrb is using the wrong IPAddress
 for IOR's.
 I tried the property OAIAddr. Only setting the property to 127.0.0.1
 and running server and client on the same machine was successful.
 Using the real address failed.
 
 Does anyone have an advise for me ?
 
 Thanks in advance
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 - EMPTY_SET.iterator() and generics
 In the old days, before generics, I wrote
 
 private SortedSet onhand;
 
 Iterator getInventoryIterator() {
 return (onhand == null ? Collections.EMPTY_SET ? onhand)
 .iterator();
 }
 
 ... the idea being to create the SortedSet only if there are
 actually some Inventory objects to store in it, and to return
 a suitable Iterator whether or not the SortedSet exists.
 
 Now, in an effort to leave prehistory behind me and adopt
 generics with all their benefits, I change the SortedSet to a
 SortedSet<Inventory> and change the return type of the method
 to Iterator<Inventory> -- but how do I rewrite the guts of the
 method to get the compiler to understand that all is well? The
 problem seems to be that Collections.EMPTY_SET.iterator() returns
 an Iterator<Object>, and the compiler complains when I try to
 return this in place of the desired Iterator<Inventory>. I've
 tried a few variations, but have only succeeded in moving the
 warning message around, not in eliminating it:
 
 return (onhand == null
 ? (Set<Inventory>)Collections.EMPTY_SET : onhand)
 .iterator();
 
 return (Iterator<Inventory>)
 (onhand == null ? Collections.EMPTY_SET ? onhand)
 .iterator();
 
 This seems like a lot of trouble to take over the empty set,
 but there ought to be *some* clean way to do it. Ideas?
 
 --
 Eric Sosman
 email***@***.com
- 9
 - Asking help for a java io problemHello, guys! I have a problem running the following code with eclipse
 showing that:
 
 java.io.IOException: Stream closed
 at sun.nio.cs.StreamDecoder.ensureOpen(Unknown Source)
 at sun.nio.cs.StreamDecoder.read(Unknown Source)
 at java.io.InputStreamReader.read(Unknown Source)
 at HtmlFileParser.parseHtmlDoc(HtmlFileParser.java:32)
 at HtmlFileParser.main(HtmlFileParser.java:52)
 
 //code here:
 try{
 FileInputStream fin = new FileInputStream("test.html");
 InputStreamReader fr = new InputStreamReader(fin);
 for(i=0; i<2048; i++) buf[i] = '0';
 fr.read(buf, 0, 2048); //problem here (line 32)
 FileWriter fw = new FileWriter("bufWriteTest.txt");
 fw.write(buf);
 fw.flush();
 }
 catch(FileNotFoundException e) {
 e.printStackTrace();
 }
 catch(IOException e) {
 e.printStackTrace();
 }
 There are no syntax erro in the above code, it just dosen't work,
 please help me finding out what the problem is, thank you.
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 When writing a Swing/JFC application in Java, it would be really nice to
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 Thanks in advance.
 
 --
 Randolf Richardson - kingpin+email***@***.com
 The Lumber Cartel, local 42 (Canadian branch)
 http://www.lumbercartel.ca/
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 lines 25 and 25 seems redundant. However, I can find nothing in
 the language that would let that be done in the constructor,
 between lines 18 and 19. The obvious would be
 
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 but that of course does not work. Is there any bridge at all
 between reflection and generics? I suspect the answer is no
 and the code below is the best that can be done, but I'm
 not sure.
 
 1 import java.lang.reflect.Method;
 2 public class TestEnums
 3 {
 4 public static enum A
 5 {
 6 V1,
 7 V2;
 8 }
 9 public static enum B
 10 {
 11 X1,
 12 X2,
 13 X3;
 14 }
 15 public static class C<T extends Enum<?>>
 16 {
 17 public C(Class<T> x) throws Exception
 18 {
 19 T[] eVal = x.getEnumConstants();
 20 for (Enum<?> v : eVal) System.out.println(v.toString());
 21 }
 22 }
 23 public static void main(String[] args) throws Exception
 24 {
 25 C<A> ca = new C<A>(A.class);
 26 C cb = new C(B.class);
 27 }
 28 }
- 12
 - Riddle me thisOn Mon, 07 Nov 2005 11:35:27 GMT, "Sharp Tool"
 <email***@***.com> wrote, quoted or indirectly quoted someone
 who said :
 
 >All these distribution dont include negative numbers?
 
 A normal is clustered about a mean, nominally 0, with symmetric tails
 left and right.
 
 Poisson is a distribution of positive numbers.
 
 Just what do these numbers measure?
 --
 Canadian Mind Products, Roedy Green.
 http://mindprod.com Java custom programming, consulting and coaching.
- 16
 - jbuilder 2005 backward compatabilityHi
 I have a project that created by jbuilder X, in the "design" panel,
 everything work great, but when i use jbuilder 2005 to open it, it
 only display gray. Do you know why?
 
 thanks
 from Peter (email***@***.com)
- 16
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 not modal.
 
 Thanks
 Bora

Author

Message

prolifekilledmywife@yahoo.com

Posted: 2005-12-29 5:16:00

Top

java-programmer, GUI program locking up... I'm using Netbeans 5.0 beta for an IDE, with swing components. The
situation is something like this:

The program is a board game - the user chooses a building from a panel,
and then is supposed to get a message to choose what resource to pay
for it with. Here's a trace of the code:

Game (main object):
....
board[i].activate():
Game.game.setPlayer(worker);
Game.game.playerMessage("Choose a wooden building
from the building panel.");
Game.game.waitForBuild(type) :
built = false;
state = type + Game.BuildWood -
1;

mainPanel.buildings.getBP().setSelectedIndex(type-1);
while(!built)
{ Thread.yield(); }
No problems yet. This works fine, unless a building that needs to call
chooseResource is selected.
So, the user clicks one of these buildings, which activates the
following code, which is where the freeze occurs:

String r = Game.game.chooseResource():
state = Game.chooseResource;
resource = "";
while(resource.length()==0)
Thread.yield();
return resource;

Now chooseResource does work in any other context - resource gets set
by a mouseClicked event handler in a panel out there. But at this
point, the GUI stops responding. The playerMessage never gets printed,
and the click event never gets triggered. I did some investigating,
printing out numbers inside the two inmost loops, and the
chooseResource loop is continually running. I know the code's ugly,
but even so, the cause of this behavior is beyond me. Any suggestions
would be greatly appreciated!

Chris Smith

Posted: 2005-12-29 8:16:00

Top

java-programmer >> GUI program locking up... email***@***.com <email***@***.com> wrote:
> I'm using Netbeans 5.0 beta for an IDE, with swing components. The
> situation is something like this:

[...]

Please don't multipost. I just wrote you an answer in a different
newsgroup.

--
www.designacourse.com
The Easiest Way To Train Anyone... Anywhere.

Chris Smith - Lead Software Developer/Technical Trainer
MindIQ Corporation

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- 3
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 I'm curious as to which tool you use for this task. The way you said that
 ("got out my ...") seems to me to indicate that you've also made your own...
 
 I have written one myself (in Tcl, not in Java, so I do the parsing completely
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 yet good enough for prime time).
 
 PS: this is not meant as a general question about such tools. Meanwhile I know
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 the return String have to be DES(nameofthestringtoencript)
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 Well I can't get it to work and being the presistant bugger that i am I have
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 I have resorted to just trying to display the output of mem.exe.
 
 here is the source ::: test.java
 
 import java.io.*;
 import java.lang.*;
 
 public class test
 { public static void main(String[] args)
 {
 int ch;
 int status;
 
 try
 {
 Process process = Runtime.getRuntime().exec("mem.exe");
 InputStream in = process.getInputStream();
 BufferedInputStream buf = new BufferedInputStream(in);
 
 //try
 //{
 //status = process.waitFor();
 //}
 //catch (InterruptedException e) {status = -1;}
 
 try
 {
 while((ch = buf.read()) != -1)
 {
 System.out.print((char)ch);
 }
 
 }
 catch (IOException e) {System.out.println(e);}
 //in.close();
 //buf.close();
 //process.destroy();
 //Runtime.getRuntime().gc();
 //Runtime.getRuntime().exit(-1);
 //System.out.print('\n');
 }
 catch (IOException e) {System.out.println(e);}
 }
 }
 
 It works the first time I run the class file with java test.
 However, the next attempt hangs and requires a system restart inorder to get
 the code to display the results.
 
 The commented code in test.java are my attempts to do various things to
 clean up this issue of not displaying the results.
 
 Does anyone have a clue or suggestion...
 
 thanks,
 publius36
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 I am new to java programming. In my application I wanted to convert xml
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 accepts only xml data type and not xml Node type. So I wanted to
 convert this xml Node to XML data type.
 
 Can any help me with any input.
 
 Thanks
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- 9
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 opinion about how useful implementing this feature would be.
 
 Synopsis: Need column numbers in stack traces
 Description:
 A DESCRIPTION OF THE REQUEST :
 Stack traces contain only line numbers and in certain cases line number
 alone is not sufficient for figuring out where exactly an exception
 occurred. Consider the following line of code.
 
 value = getItem().getRelatedItem().getName().getValue();
 
 If the above line throws a NullPointerException, we have no clue
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 sufficiently helpful in narrowing down the problem. If the stack trace
 also contains the column number where the null was encountered, it will
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 Though the above code could be rewritten to several lines so that we
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 The relationship is simple, I have two entity beans, person and
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 Here's what I have:
 
 /**
 * @return the company the person belongs to
 *
 * @ejb.persistent-field
 * @ejb.persistence
 * column-name="COMPANY_ID"
 * sql-type="integer"
 * jdbc-type="integer"
 *
 * @ejb.interface-method
 *
 * @ejb.relation
 * name="Person-Company"
 * role-name="Person-belongs-to-Company"
 * target-ejb="Company"
 * target-role-name="Company-has-many-Persons"
 * target-multiple="yes"
 *
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 * fk-constraint="true"
 * fk-column="COMPANY_ID"
 * related-pk-field="id"
 *
 */
 public abstract CompanyLocal getCompany();
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 I have been a java developer for around 5 years, and I think it is time to
 move into the J2EE arena.
 Just by looking at monster.com, it becomes very obvious how important J2EE
 has become, and if anyone is planning to make Java their bread and
 Given that J2EE is not used in my current job, what is the best way to learn
 it on my own and in my free time?
 I looked at the websites of community colleges and universities around my
 area, and I found that they only offer beginner and intermediate Java
 classes, with no emphasis on J2EE.
 
 What do you guys think is a good way to achieve this goal? How do
 programmers usually make the transition from Java programmers to J2EE?
 
 I have already experimented with Tomcat and some basic jsp stuff, but i am
 sure J2EE is much more than that.
 
 Any idea is greatly appreciated, and if you have a success story, please
 share it here!
 Cheers
 hilz
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 declarations, and any compilation unit that "withed" in that package
 could use them. On the other hand if I want to use my own customized
 exceptions in Java, it looks like I have to declare each one individu-
 ally in its own file. Is this really what I have to do, or is there a
 way to declare a bunch of exceptions in one file so that I can use
 them elsewhere?
 
 ---Kevin Simonson
 
 "You'll never get to heaven, or even to LA,
 if you don't believe there's a way."
 from _Why Not_
- 13
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 Middleware, like MQ series.
 
 Does this mean I actually need MQ series? ITs to expensive. Im
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 boss came to me and told me that he would like to connect to a remote
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 Now I have taken the channel and decided to write something at my desk
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 do this project, i would still like to learn it.
 
 I really thought that j2ee already had a queing facility built in so I
 didnt need to buy mq series.
 
 If i do need a middle where queue piece, then are there any free ones.
 
 I thought i could go into the j2ee command line tool and just set up
 the queues the way they have it in the example
 
 Can you straighten out my confusion?
 
 jodasi
- 14
 - Class with only methods - less memory? Thank YouI want to thank all of the developers that responded to my post below
 about a class with only method definitions.
 
 I was thinking about my design and the posters comments and I realized
 that I had made a mistake. My class will contain a single member
 variable. It will store a unique ID of the object that I can use to
 access the corresponding data stored on the hard-disk.
 
 Thanks for helping me figure this one out.
- 15
 - Starting using Inversion of ControlHi
 
 I have an existing (Java desktop) application, which I'm looking at
 converting to use Inversion of Control principles. I'm just starting
 to look at the Java containers - HiveMind, Pico, Spring etc.
 
 I'm not sure about how components/services/objects always have to be
 instantiated, rather than retrieved from an existing object.
 
 In my application, I have a IHandler interface, a single instance of
 which is used by a number of objects.
 Currently, the instance is supplied by an Engine class, which has an
 inner class implementing IHandler, and a getHandler() method which
 returns an instance of the inner class.
 
 I'm wondering how, when using Inversion of Control, I can supply this
 instance of IHandler to the objects which require it.
 Most of the containers seem to require that the instance is *created*.
 However, in this case, the instance should be *returned* from an
 existing object (which will also have been created by the container).
 
 What's the best way to deal with this situation?
 I could, for example, make the IHandler inner class to be a public
 class, so it can be instantiated directly. But I'm not convinced that
 exposing the class in this way is the ideal way to do this.
 Thanks for your help,
 Calum