Problem with the method in JSP

<%@ method = "doPost" %> ******* if i remove this statement i am getting output but what is wrong with this statement ********
<HTML>
<HEAD><TITLE>Hello</TITLE></HEAD>
<BODY>
<H1>
<% if (request.getParameter("name") == null) { %>
Hello World
<% } else { %>
Hello, <%= request.getParameter("name") %>
<% } %>
</H1>
</BODY></HTML>
(thank you for the last posted problem solving)

There is no <%@ method %> tag for a JSP.
http://java.sun.com/products/jsp/syntax/1.2/syntaxref12.html
It looks like you are trying to write a JSP that only accepts post requests - not get?
I'm not sure if you can accomplish that in a JSP directly.
You can with an HttpServlet (which is where the doGet/doPost methods are defined) but HttpJspPage doesn't extend that class necessarily.
Best you could probably do is put in a test of request.getMethod() to see if it is get/post.

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The best way to solve problem with the site containing JSP Files java co

I am getting NullPointerException pointing at some java file but I have the same JSP file of that name.
and which line it is pointing it is not there in that file means file has 500 lines and it ponting to 700.
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JSP pages compile dynamically into Servlets when requested. The error line number you got corresponds to line number of this dynamically generated Servlet not the jsp page. If you are using Apache Tomcat, these dynamically generated files should be located somewhere inside Work Folder. Anyway, you need to debug your jsp page. some line in this particular jsp page is throwing NullPointerException.

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There is no method "listFiles()" in "File" class. (JDK 1.1.8)
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at weblogic.application.compiler.Appc.main(Appc.java:174)
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at jrockit.reflect.InitialMethodInvoker.invoke(Ljava.lang.Object;[Ljava.
lang.Object;)Ljava.lang.Object;(Unknown Source)
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<build>
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<groupId>org.codehaus.mojo</groupId>
<artifactId>weblogic-maven-plugin</artifactId>
<version>2.9.0-SNAPSHOT</version>
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<inputArtifactPath>${basedir}/../../jar/broker.war</inputArtifactPath>
<verbose>true</verbose>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>appc</goal>
</goals>
<inherited>false</inherited>
<configuration>
<verbose>false</verbose>
<debug>false</debug>
<projectPackaging>war</projectPackaging>
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</executions>
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<groupId>com.sun</groupId>
<artifactId>tools</artifactId>
<version>1.5.0</version>
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<artifactId>wlxbean</artifactId>
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<version>9.2</version>
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<groupId>weblogic</groupId>
<artifactId>weblogic-container-binding</artifactId>
<version>9.2</version>
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<dependency>
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<artifactId>wlw-util</artifactId>
<version>9.2</version>
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<artifactId>javelinx</artifactId>
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<artifactId>wlw-langx</artifactId>
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<groupId>weblogic</groupId>
<artifactId>wlw-langx</artifactId>
<version>9.2</version>
</dependency>
</dependencies>
<project>
You need to install/deploy all of the above dependencies manually into your repo.

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Hi All,
I have written a simple proxy server in the form of a servlet. I changed the proxy config of my browser to connect to this servlet hosted on the default context(http://localhost:8080) of the Tomcat 5.0.25 . Well , this servlet internally connects to the proxy of the corporate LAN . The logic that I have applied is as follows. The servlet gets the request from the client (ie the browser in this case) , extracts the headers and contents from the request, sets them to a new request that it forms and finally send this new request to the proxy. When the proxy responds, the servlet collects the response headers and contents adn writes them in its response. To sum up , this servlet transparently carries the requests and responses between the client(browser) and the corporate LAN proxy. Now the problem is this. Let's say , now I am accessing http://www.google.com.The browser sends a request to my servlet with the following headers as they are extracted by my servlet.
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ProxyServer:::>headerValue::> headerName = accept : headerValue=*/*
ProxyServer:::>headerValue::> headerName = referer : headerValue=http://www.google.com/
ProxyServer:::>headerValue::> headerName = accept-language : headerValue=en-us
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ProxyServer:::>headerValue::> headerName = host : headerValue=www.google.com
ProxyServer:::>headerValue::> headerName = cookie : headerValue=PREF=ID=1be27c0a74f198ca:TM=1082058853:LM=1082058853:S=bu6ORrygzm8AUkm8
ProxyServer:::>postRequest
I set these headers into a new connection opened to the proxy and post a fresh request to the proxy,which, in turn responds with the following headers.
ProxyServer:::>posted request successfully
ProxyServer:::>writing response
ProxyServer:::>writeResponse-->headerName = Proxy-Connection : headerValue = [close]
ProxyServer:::>writeResponse-->headerName = Content-Length : headerValue = [257]
ProxyServer:::>writeResponse-->headerName = Date : headerValue = [Tue, 13 Jul 2004 14:01:40 GMT]
ProxyServer:::>writeResponse-->headerName = Content-Type : headerValue = [text/html]
ProxyServer:::>writeResponse-->headerName = Server : headerValue = [NetCache appliance (NetApp/5.5R2)]
ProxyServer:::>writeResponse-->headerName = Proxy-Authenticate : headerValue = [Basic realm="Charlotte - napxyclt2"]
ProxyServer:::>writeResponse-->headerName = null : headerValue = [HTTP/1.1 407 Proxy Authentication Required]
ProxyServer:::>writeResponse exiting
ProxyServer:::>wrote response successfully
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package server.proxy;
//import all servlet related classes
import javax.servlet.*;
import javax.servlet.http.*;
import java.util.*;
import java.io.*;
import java.net.*;
import server.resources.*;
//My Proxy server --->Currently it is very simplea and relies on
//other proxy servers of an already connected network.
public class ProxyServer extends HttpServlet
//stores the resource bundle
private ServerResBundle resBundle = null;
//checks for the mode of operation
private boolean proxySet = false;
private String proxy = null;
//storing the original System out/err etc
private PrintStream sysOutOrig = null;
private PrintStream sysErrOrig = null;
private InputStream sysInOrig = null;
//initialise certain features that are required later
public void init() throws ServletException
try
//initialise the resource bundle
this.initResBundle();
System.out.println("ProxyServer:::>res bundle init");
//set the mode of operation
this.setMode();
System.out.println("ProxyServer:::>mode set");
//set the system out and err --System.setOut etc
this.setSystemOutErr();
System.out.println("ProxyServer:::>in/out/err set");
}//End try
catch(Exception e)
System.out.println("Exception in init..."+(e.getMessage()));
throw new ServletException(e);
}//Edn
catch(Throwable e)
System.out.println("Irrecoverable Error...");
throw new ServletException(e);
}//End
}//End init
//method to init the resource bundle;
private void initResBundle()
this.resBundle = ServerResBundle.getBundle();
}//End
//method to set the mode of the server--proxy or direct
private void setMode()
//read the target proxy property from the bundle and
//if it is set,take that URL
String temp = (String)(this.resBundle.getResource(ResKeys.PROXY_SERVER));
if ( (temp != null) && (temp.length() > 0) )
this.proxySet = true;
this.proxy = temp;
temp = null;
}//End
}//End
//method to set the system out and err etc
private void setSystemOutErr() throws Exception
//keep a copy of the original system out and error
this.sysOutOrig = System.out;
this.sysErrOrig = System.err;
try
//read the options adn if they are set, take the values directly
String newOutStr = (String)(this.resBundle.getResource(ResKeys.SYSTEM_OUT));
String newErrStr = (String)(this.resBundle.getResource(ResKeys.SYSTEM_ERR));
if ((newOutStr != null) && (newOutStr.length() > 0))
System.setOut(new PrintStream(new FileOutputStream(new File(newOutStr),true),true));
}//End if
if ((newErrStr != null) && (newErrStr.length() > 0))
System.setErr(new PrintStream(new FileOutputStream(new File(newErrStr),true),true));
}//End if
}//End
catch(Exception e)
//restore the stuff
System.setOut(this.sysOutOrig);
System.setErr(this.sysErrOrig);
}//End
}//End
//this is where the proxy functionalities will be embedded
public void service(HttpServletRequest req,HttpServletResponse resp)
throws ServletException,java.io.IOException
//conenction URL
URL target = null;
//conenction to the remote object
URLConnection targetConn = null;
//stores the OOS and the OIS
ObjectOutputStream oos = null;
ObjectInputStream ois = null;
try
//check for the mode of operation
if (proxySet)
URLConnection objects go through two phases: first they are created, then they are connected.
After being created, and before being connected, various options can be specified
(e.g., doInput and UseCaches). After connecting, it is an error to try to set them.
Operations that depend on being connected, like getContentLength, will implicitly perform the connection,
if necessary.
//for the URL to the proxy
target=new URL(this.proxy);
//conenct to the proxy
targetConn = target.openConnection();
//set the details of the connectuon
targetConn.setDoInput(true);
targetConn.setDoOutput(true);
targetConn.setUseCaches(false);
// If true, this URL is being examined in a context in which it makes sense to allow user interactions such as popping up an authentication dialog. If false, then no user interaction is allowed
targetConn.setAllowUserInteraction(true);
//connect to the remote object
// targetConn.connect();//call this only when all the request properties are set
System.out.println("ProxyServer:::>posting request");
//post the received request to the URL
this.postRequest(targetConn,req);
System.out.println("ProxyServer:::>posted request successfully");
System.out.println("ProxyServer:::>writing response");
//receive the response
//write the received response to the client
this.writeResponse(targetConn,resp);
System.out.println("ProxyServer:::>wrote response successfully");
}//End if
else
//currently this functionality is not supported
throw new ServletException(
(String)(this.resBundle.getResource(ResKeys.ERR_FUNC_NOTSUPPORTED)));
}//End
}//End try
catch(Exception e)
if(e instanceof ServletException)
throw (ServletException)e;
}//End
if (e instanceof IOException)
throw (IOException)e;
}//End
//wrap it up in ServletException
throw new ServletException(e);
}//End
}//End
//method to write the response back to the client
private void writeResponse(URLConnection targetConn,HttpServletResponse resp)
throws ServletException
//get all the header fields from the response connection and set them to the
//response of the servlet
Map headerFields = null;
Iterator headerFieldEntries = null;
Map.Entry header = null;
//stores the input stream to the conn
BufferedReader brConn = null;
//stores the writer to the response
PrintWriter prResp = null;
//checks if the proxy authentication needed or not
boolean proxyAuthReqd = false;
try
//juste ensuring that the proxy authentication is reset
proxyAuthReqd = false;
if( (targetConn != null) && (resp != null) )
//Returns an unmodifiable Map of the header fields.
//The Map keys are Strings that represent the response-header field names.
//Each Map value is an unmodifiable List of Strings that represents the corresponding
//field values
headerFields = targetConn.getHeaderFields();
//Returns a set view of the mappings contained in this map
Set temp = headerFields.entrySet();
//Returns an iterator over the elements in this set
headerFieldEntries = temp.iterator();
if (headerFieldEntries != null)
while (headerFieldEntries.hasNext())
Object tempHeader = headerFieldEntries.next();
if (tempHeader instanceof Map.Entry)
header = (Map.Entry)tempHeader;
Object headerName = header.getKey();
Object headerValue=header.getValue();
System.out.println("ProxyServer:::>writeResponse-->headerName = "+headerName+" : headerValue = "+headerValue);
//do not select the key-value pair if both the key adn the value are null
if ( ( headerName == null) && (headerValue == null) )
continue;
}//Enmd
if (headerValue != null)
List headerValList = null;
if (headerValue instanceof List)
headerValList = (List)headerValue;
}//End
if(headerValList != null)
for (int i=0;i<headerValList.size();i++)
Object headerValueStr = headerValList.get(i);
if (headerValueStr instanceof String)
//note that the header-key can not be null for addHeader
//I have made this temporary provision to make the programme work.
resp.addHeader(( (headerName==null)? ("null_header"+i) :(String)headerName),
(String)headerValueStr);
//check if the proxy authentication required or not
if (((String)headerValueStr).
indexOf(resp.SC_PROXY_AUTHENTICATION_REQUIRED+"") != -1)
System.out.println("ProxyServer:::>writeResponse-->proxy auth needed");
//proxy authentication is needed
proxyAuthReqd = true;
}//End
}//Ednd of
else if (headerValueStr == null)
resp.addHeader(( (headerName==null)? null :(String)headerName),
null);
}//End
}//End for
}//End if
}//End if
}//End
}//End while
}//End if
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prResp = resp.getWriter();
System.out.println("ProxyServer:::>writeResponse-->proxyAuthReqd="+proxyAuthReqd);
//juste test a simple header
System.out.println("Proxy-Authenticate = "+(resp.containsHeader("Proxy-Authenticate")));
//if the proxy asks you for authentication,pass on the same to the client
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//is closed by the remotehost adn hence any attempt to open in input steram
//results in an error ie IOException
if (!proxyAuthReqd)
//now get the content adn write it to the response too
brConn = new BufferedReader(new InputStreamReader(
targetConn.getInputStream()));
String tempStr = null;
while ((tempStr = brConn.readLine())!=null)
prResp.println(tempStr);
}//End while
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brConn.close();
}//End if
else
prResp.println("Proxy Authentication needed...");
}//End
//close the streams
prResp.flush();
prResp.close();
}//End if
System.out.println("ProxyServer:::>writeResponse exiting\n");
}//End try
catch(Exception e)
throw new ServletException(e);
}//End
}//End
//method to post request to the internet
private void postRequest(URLConnection targetConn,HttpServletRequest req)
throws ServletException
//extract the header parameters and the body content from the incoming request
//and set them to the new connection
Enumeration reqHeaders = null;
//reads the incoming request's content
BufferedReader brReqRd = null;
PrintWriter prResWt = null;
//stores temp header names and values
String headerName = null;
String headerValue = null;
try
if( (targetConn != null) && (req != null) )
reqHeaders = req.getHeaderNames();
//extract a header adn set it to the new connection
while (reqHeaders.hasMoreElements())
headerName = (String)(reqHeaders.nextElement());
headerValue = req.getHeader(headerName);
targetConn.setRequestProperty(headerName,headerValue);
System.out.println("ProxyServer:::>headerValue::> headerName = "+headerName+" : headerValue="+headerValue);
}//End
System.out.println("ProxyServer:::>postRequest\n");
//establis the actual connection
//calling this method bfore the above loop results in IllegalStateException
targetConn.connect();
//NOTE : try reading from and writing into OIS and OOS respectively
//now read the contents and write them to the connection
// brReqRd = req.getReader(); //this hangs for some reason
brReqRd = new BufferedReader(new InputStreamReader(req.getInputStream()));
System.out.println("Got the reader..brReqRd = "+brReqRd);
if (brReqRd != null)
String temp = null;
//establish the printwriter
// prResWt = new PrintWriter(targetConn.getOutputStream(),true);
prResWt = new PrintWriter(targetConn.getOutputStream());
System.out.println("trying to read in a loop from brReqRd.. ready="+(brReqRd.ready()));
while( (brReqRd.ready()) && ((temp=brReqRd.readLine()) != null) )
System.out.println("In while::>temp = "+temp);
prResWt.println(temp);
}//Emd while
//close the streams adn go back
brReqRd.close();
prResWt.flush();
prResWt.close();
}//End
}//End outer if
System.out.println("ProxyServer:::>postRequest exiting\n");
}//End try
catch(Exception e)
throw new ServletException(e);
}//End
}//End
}//End

Hi serlank ,
Thanks for your reply. Well , I initially I thought of not pasting the code,as it was too long. But I could not help it,as I thought I must show in code what I exactly meant. That's why I followed a description of my problem with the code. You could probably have copied the code and pasted it in one of your favourite editors to take a look at it. Did you,by any chance, try to read it on the browser? And as regards reposting the same message, I can say that I did it as I felt the subject was not quite appropriate in the first posting and I was not sure as to how I could delete/alter the posting. I am not asking for a code-fix,but some suggestions from some one who might ever have come across such a thing.Anyway, lemme know if you have any idea on it. Thanks...

HT3310 i have a problem with the headset of my ipod nano 4th gen. the right side don't have a sound. It comes in and out. what do I need to do?.. I am using the original headset eversince. I took it to an Apple Mac Center I was told they can't do anythin

I have a problem with the headset of my ipod nano 4th gen. the right side don't have a sound. It comes in and out. what do I need to do.. I am using the original headset eversince. I tool it to a Apple Mac Cennter and Taked with a Service Center Rep. And he told me that they can't do anything because they don't repair the ipod they didn;t even look at it. I was told instead to buy a new one. I was very disappointed.. This is already my 5th ipod though i am planning to buy a new one.. I still want it fixed so I can give it to my little sister

From the OP: "My old computer got a virus and when that happened all my music was lost. "
They don't have the music on their computer so they cannot transfer the iTunes folder, from the computer to their iPod and then to the new computer. And if they try to enable disk use on the iPod it will erase all the music that is on it. The method you cited is moving the files in a data format using the iPod as a flash drive. It doesn't work if they are in music format. That is why I suggested Yamipod.

Problem with the printer or ink system code 0x610000f6 HP model 6700 premium

Hello, I have recieved an alert for the second time in a week stating that there is a problem with the printer or ink system. The alert prompts me to turn off, then on the printer. If problem persists, contact HP. 0x610000f6. What could be the cause for this type of alert to appear?

'0x610000f6' error message appears if there is a 'Paper Jam' or a 'Carriage Jam' in the printer.
You can experience following issues:
The product won't print.
The print job stops unexpectedly.
To resolve Error code '0x610000f6' follow methods provided in below mentioned link
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c01620497

Problem with the light with bootcamp/windows 7 (64 bits)

Hello there,
After the last windows or bootcamp update, i got a problem with the light of my windows.
I can't adjust it with all methods (windows power or F1/F2).
I don't know how to solved it.
Thanks for your help.

I am sorry, but to get your issue more exposure I would suggest posting it in the commercial forums since this is a commercial product. You can do this at: http://h30499.www3.hp.com/t5/Printing-and-Digital-Imaging/ct-p/bsc-412
I hope this helps!
R a i n b o w 7000I work on behalf of HP
Click the “Kudos Thumbs Up" at the bottom of this post to say
“Thanks” for helping!
Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

Problem with the GridBagLayout Manager

Hello i am new to Java Swing and i am facing a problem with the GridBagLayout layout manager . the code in question is attached. First compile and run the code. It will execute w/o probs . Then go to the "Console" tab. There the diff components (6 buttons and 1 text area) are haphazardly arranged where as all measures where taken to prevent it in the code. The GridBagLayout manager for this tab is not working properly please help.
The code in question:-
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class MainForm extends JFrame{
     JTabbedPane jtp = new JTabbedPane();
     Container generalContainer; // container for the general pane
     Container consoleContainer; // container for the console pane
     GridBagLayout consoleLayout = new GridBagLayout(); // GridBagLayout for the console
     GridBagConstraints consoleConstraints;// GridBagConstraints for the console
     public MainForm()
          super("Welcome to Grey Griffin -- Network Simulator");
          setSize(700,600);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          JPanel generalPane = new JPanel();
          generalPane.setLayout(new BoxLayout(generalPane, BoxLayout.Y_AXIS));
          JPanel consolePane = new JPanel();
          consolePane.setLayout(new BoxLayout(consolePane, BoxLayout.Y_AXIS));
          JPanel designPane = new JPanel();
          designPane.setLayout(new BoxLayout(designPane, BoxLayout.Y_AXIS));
          JPanel outputPane = new JPanel();
          outputPane.setLayout(new BoxLayout(outputPane, BoxLayout.Y_AXIS));
          //Setting up Layout for all the tabs
           //for general tab
           FlowLayout layout= new FlowLayout();
           generalContainer = generalPane;
           layout.setAlignment(FlowLayout.CENTER);
           generalContainer.setLayout( layout );
           //for console tab
           consoleContainer = consolePane;
           consoleConstraints = new GridBagConstraints();
           // *******Finished********
          //********** All buttons text areas are declared here**********
            //*******for the general tab**********
          JButton generalCreate = new JButton("Create a New Network");
          JButton generalOpen = new JButton("Open an Existing Network");
          JButton generalSave = new JButton("Save the Network");
          JButton generalSaveAs = new JButton("Save As..........");
          JButton generalExit = new JButton("Exit");
          //******END******
         //*******for the console tab
             //text area
          JTextArea consoleCode = new JTextArea();
          consoleCode.setEditable(true);
          consoleCode.setMaximumSize(new Dimension(700,400));
          consoleCode.setAlignmentX(0.0f);
               //text area complete
             //*******for the Console tab**********
          JButton consoleCompile = new JButton("Compile Code");
          JButton consoleSimulate = new JButton("Simulate Code");
          JButton consoleReset = new JButton("Reset");
          JButton consoleOpen = new JButton("Open script files");
          JButton consoleSave = new JButton("Save script files");
          JButton consoleConvert = new JButton("Convert Script files to graphical form");
          //***************END****************
     //Adding buttons and text areas to there respective tabs
          // for the general tab
          generalContainer.add(generalCreate);
          generalContainer.add(generalOpen);
          generalContainer.add(generalSave);
          generalContainer.add(generalSaveAs);
         generalContainer.add(generalExit);
         //****END****
          // for the console tab
          consoleConstraints.fill = GridBagConstraints.BOTH;
          addComp(consoleOpen,0,0,1,1);
          consoleConstraints.fill = GridBagConstraints.BOTH;
          addComp(consoleSave,1,1,1,1);
          consoleConstraints.fill = GridBagConstraints.BOTH;
          addComp(consoleConvert,1,2,1,1);
          consoleConstraints.fill = GridBagConstraints.BOTH;
          addComp(consoleCode,1,0,3,1);
          consoleConstraints.fill = GridBagConstraints.BOTH;
          addComp(consoleCompile,2,0,1,1);
          consoleConstraints.fill = GridBagConstraints.BOTH;
          addComp(consoleSimulate,2,1,1,1);
          consoleConstraints.fill = GridBagConstraints.BOTH;
          addComp(consoleReset,2,2,1,1);
          //****END****
          // adding the tabs
          jtp.addTab("General",null,generalPane,"Choose General Options");
          jtp.addTab("Design",null,designPane,"Design your own network!!");
          jtp.addTab("Console",null,consolePane,"Type commands in console for designing");
          jtp.addTab("Output",null,outputPane,"View output");
          getContentPane().add(jtp, BorderLayout.CENTER);
          //****END****
     //This method is used to ad the buttons in the GridBagLayout of the Console tab
     private void addComp( Component c,int row,int column,int width,int height)
        // set gridx and gridy
        consoleConstraints.gridx=column;
        consoleConstraints.gridy=row;
        //set gridwidth and grid height
        consoleConstraints.gridwidth=width;
        consoleConstraints.gridheight=height;
        //set constraints
        consoleLayout.setConstraints(c,consoleConstraints);
        consoleContainer.add(c);
     class TabManager implements ItemListener
          Component tab;
          public TabManager(Component tabToManage)
               tab = tabToManage;
     public void itemStateChanged(ItemEvent ie)
          int index=jtp.indexOfComponent(tab);
         if (index!=-1)
              jtp.setEnabledAt(index,ie.getStateChange()== ItemEvent.SELECTED);
         MainForm.this.repaint();
public static void main(String args[])
     MainForm form = new MainForm();
     form.setVisible(true);
}

Thanks for the suggestions. I did away with the GridBagLayout Altogether :-D
and put all the buttons in a seperate JPanel and added that JPanel into the Console tabs container which was using a BorderLayout this time. Take a look
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
public class MainForm extends JFrame{
     JTabbedPane jtp = new JTabbedPane();
     public MainForm()
          super("Welcome to Grey Griffin -- Network Simulator");
          setSize(800,600);
          setDefaultCloseOperation(EXIT_ON_CLOSE);
          JPanel generalPane = new JPanel();
          generalPane.setLayout(new BoxLayout(generalPane, BoxLayout.Y_AXIS));
          JPanel consolePane = new JPanel();
          consolePane.setLayout(new BoxLayout(consolePane, BoxLayout.Y_AXIS));
          JPanel designPane = new JPanel();
          designPane.setLayout(new BoxLayout(designPane, BoxLayout.Y_AXIS));
          JPanel outputPane = new JPanel();
          outputPane.setLayout(new BoxLayout(outputPane, BoxLayout.Y_AXIS));
          //Setting up Layout for all the tabs
          //**for the general tab
           Container generalContainer;
           FlowLayout layoutGeneral= new FlowLayout();
           generalContainer = generalPane;
           layoutGeneral.setAlignment(FlowLayout.CENTER);
           generalContainer.setLayout( layoutGeneral );
           //**for the console tab
            Container consoleContainer;
            consoleContainer = consolePane;
            consoleContainer.setLayout(new BorderLayout() );
           //Creating buttonpanel for adding the buttons
            JPanel buttonPanel1 = new JPanel();
            buttonPanel1.setLayout(new GridLayout(1,3));
            JPanel buttonPanel2 = new JPanel();
            buttonPanel2.setLayout(new GridLayout(1,3));
          // All buttons / text areas / images are declared here
          //**Buttons for the general tab**//
          JButton generalCreate = new JButton("Create a New Network");
          JButton generalOpen = new JButton("Open an Existing Network");
          JButton generalSave = new JButton("Save the Network");
          JButton generalSaveAs = new JButton("Save As..........");
          JButton generalExit = new JButton("Exit");
          //declaring the buttons
          JButton consoleCompile = new JButton("Compile");
          JButton consoleRun = new JButton("Run");
          JButton consoleReset = new JButton("Reset");
          JButton consoleOpen = new JButton("Open script files");
          JButton consoleSave = new JButton("Save script files");
          JButton consoleConvert = new JButton("Convert Script files to graphical form");
          //declares the textarea where the code is written
          JTextArea consoleCode = new JTextArea();
          consoleCode.setEditable(true);
          consoleCode.setMaximumSize(new Dimension(500,600));
          consoleCode.setAlignmentX(0.0f);
          //Adding buttons and text areas to there respective tabs
          //**Buttons and text pads for the general tab**
               generalContainer.add(generalCreate);
          generalContainer.add(generalOpen);
          generalContainer.add(generalSave);
          generalContainer.add(generalSaveAs);
             generalContainer.add(generalExit);
          //adding buttons to the button panel 1
          buttonPanel1.add(consoleOpen);
          buttonPanel1.add(consoleSave);
          buttonPanel1.add(consoleConvert);
          //adding buttons to the button panel2
          buttonPanel2.add(consoleRun);
          buttonPanel2.add(consoleReset);
          buttonPanel2.add(consoleCompile);
          //adding button panels and textarea
          consoleContainer.add(buttonPanel1,BorderLayout.NORTH);
          consoleContainer.add(consoleCode,BorderLayout.CENTER);
          consoleContainer.add(new JScrollPane(consoleCode));
          consoleContainer.add(buttonPanel2,BorderLayout.SOUTH);
          //adding the tabs
          jtp.addTab("General",null,generalPane,"Choose General Options");
          jtp.addTab("Design",null,designPane,"Design your own network!!");
          jtp.addTab("Console",null,consolePane,"Type commands in console for designing");
          jtp.addTab("Output",null,outputPane,"View output");
          getContentPane().add(jtp, BorderLayout.CENTER);
     class TabManager implements ItemListener
          Component tab;
          public TabManager(Component tabToManage)
               tab = tabToManage;
     public void itemStateChanged(ItemEvent ie)
          int index=jtp.indexOfComponent(tab);
         if (index!=-1)
              jtp.setEnabledAt(index,ie.getStateChange()== ItemEvent.SELECTED);
         MainForm.this.repaint();
public static void main(String args[])
     MainForm form = new MainForm();
     form.setVisible(true);
}

Getting problem with the new java.util.concurrent package

i m using the new concurrency package of jdk 1.5 in my code. see the line:
Executor threadPool = Executors.newCachedThreadPool();
about this, api doc says Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available
but i dont find this method to create new threads whenever required. please tell me about this.
in my code, in some rare cases many threads r created, and very difficult to detect the number of active threads.
as the previous one failed i tried with another one newFixedThreadPool(int). but here i got another problem. it works successfully but i dont understand what should be the size of the pool. i tried with 1000, it works well, but in a very rare case, it failed also. then i tried with 10000. but i m still confused, i dont know whether it would work always or not. with traditional threads my code never fails.
please tell me, what should be the size of the pool and also let me know what is the problem with the first one (newCachedThreadPool)

The thread pool should not be more than 100 threads. Ideally you should only have a small number of threads per CPU. If your threads are not long running it is possible that you could add 10,000 runnables but on start a small number of threads. Note, adding a thread take a non trivial amount of time so while the thread is added, all the others could finish. This could mean the number of threads could be 140 or smaller.
Have you looked at the code to see what it does?

Problem with the method in JSP

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