Problem in executing multithreaded program

Hi all, I have a java program with 3 thread, thread1 , thread2 , thread3. When I call thread1.run() , thread2.run() and thread3.run() .. the execution of thread1 and thread2 start but thread3 does not run. Thread1 contains linked list handling , Thread2 contains execution of "tcpdump" command and Thread3 contains execution of "ping" command. Can anybody tell me why my thread3 is not running ??

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Date comparisons

Hi, I'm using Java 1.5. I have a java.util.Date object and I would like to determine if it's date (i.e. year, month, and day) are greater than (in the future) or equal to today's date (year, month, and day). However, I don't care about any time component (hour, minute, second ...) when the comparison is taking place. What is the easiest way I can determine this? Thanks, - Dave

Open popup from JSP - Servlet ??

Could some Java guru please help ?? I have a JSP, from inside which of which I do a POST to a Servlet, which then does some operations inside its 'doPost' method and at the end dynamically generates a Web page. Currently, this page is rendered inside a frame. How do I make the page be rendered inside a popup window ? Any hints, suggestions would be of immense value - thanks in advance for your help.

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Java Interview Questions

This article attempts to discuss core java IT technical interview questions in detail. These are some of the java job interview questions that are frequently asked in java interviews. Questions from different people and communities are consolidated in place for your convenience. These questions are organized according to various java topics. Follow the content : http://www.ezdia.com//Java-Interview-Question/Content.do?id=1340 This is to help you prepare well for java related technical interviews. I wish you good luck and hope you find a great job.

Speaking of thread safety?

Does anybody know if the Observable/Observer calls to update() are on the EDT? Thanks, -- Knute Johnson email s/nospam/knute2010/

JDBC Connection Issue

This is a multi-part message in MIME format. --------------090708090704040103010901 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Hi All, I'm running a simple perl script that checks if port 3306(mysql) is open or not and display's either PASSED or FAILED Perl Code: http://pastebin.org/108205 This small script seems to be working fine, but when I put into place our java applications that are using mysql though the jdbc driver started to crash (The services crash over night after a jboss restart). I started to do some testing

Hashcode and Equal

import java.util.*; public class Qn353 { private String name; public Qn353(String name) { this.name = name; } public boolean equals(Object o) { if ( ! (o instanceof Qn353) ) return false; Qn353 p = (Qn353) o; return p.name.equals(this.name); } public static void main(String [] args) { HashSet<Object> hs = new HashSet<Object>(); hs.add(p1); hs.add(p2); System.out.println(hs.siz

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I got asked this question about Applet use by blind people. I did not know the answer. "One question I was hoping you would answer what keystroke allows a user to get into an applet on a web page, or get out of an applet on a web page? I'm asking because if someone is disabled, a web app must perform all function without a mouse and only using a keyboard. When I go to you sample pages, it is easy to navigate using the keyboard (using Tab and Shift+Tab) to get to every field in the applet, but I cannot get out with the keyboard to get to the other links on the page. If I Alt+

CodeWarrior begins on Mar 5, 06:00 pm IST. Certificates & Prizes worth 20,000 INR.

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How to get the file name from a String containing the path plus the file name?

Hi, I have a String "dirA/dirB/dirC/file.txt". How to use String manipulation technique to get "file.txt"? String fullName = "dirA/dirB/dirC/file.txt"; int index = fullName.lastIndexOf("\\"); //here is a problem, if I try lastIndexOf("\"), there is a compile error String fileName = fullName.subString(index); //but does not work Thank you very much. ps: I am working on linux.

Best Practices for Writing XML

What are the best-regarded Java classes for writing XML these days? I'm afraid I've been out of touch with XML for a few years and long ago lost track of what is well-regarded in the Java community for creating XML files. I have a need to write an XML file but NOT to work with it any further; the file will be read by Microsoft Word but not processed any further. If someone can point me to some suitable classes for writing XML - and, ideally, a tutorial describing the proper use of these classes - I would really appreciate that. -- Rhino

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Java DOM: add an attribute to a node

Hi all, I need to write a new XML file from scratch, I've just a doubt about adding an attribute to an element. This is the code, but maybe there is a way to write less code to do that. What do you think about that ? //START CODE .... Document doc=docBuilder.newDocument(); Node rootNode=doc.createElement("MarketNews"); Attr id=doc.createAttribute("id"); id.setValue("123456"); NamedNodeMap rootAttr=rootNode.getAttributes(); rootAttr.setNamedItem(id); doc.appendChild(rootNode); .... //END CODE Thanks all and best regards, Ale

"Class not found" when loading java Applet from forwarded Domain?

I have a problem with the following situation: A domain www.aaa.com is linked/forwarded to a sub directory of another domain e.g. www.bbb.com\aaastuff on another server. So when a user enters www.aaa.com in his browser all stuff should be retrieved and presented from the directory of www.bbb.com\aaastuff. This works well in general except one thing: The web page contains an applet with the definition shown below. Instead of showing the applet a white rectangle is shown and the java console tells the user: java.lang.ClassNotFoundException: Logo.class Why? Yes, the java cl

Microsoft Word Autocorrects

I have been attempting to decode a file used my Microsoft Word, one that stores the autocorrects, possibly to create some utilities to manage them, export, import etc. I wrote this little program to dump out the contents of an autocorrect file to test my understanding of the format. It had a number of unexpected wrinkles after I thought I had it nailed. There are still few puzzles left. I thought some people here might enjoy the challenge of solving them. If not, just ignore this post. /* * @(#)Autocorrects.java * * Summary: read MS Word autocorrects file. * * Copyrig

jdbc connection

hey m writing program in java to connect it to mysql. I have given driver name as Class.forName("com.mysql.jdbc.Driver"); but i am getting ClassNotFoundException. Please help me what shall i do.

Reflection accessing subclass

Hi, Can anyone please tell me how I would access a subclass members with reflection. So for example: public class MyTestClass { public class SourceObj { String mytest1; } String mytest1; int mytest2; long mytest3; List<String> mytest4 = new java.util.ArrayList<String>(); HashMap<String,String> mytest5 = new HashMap<String, String>(); SourceObj mytest6 = new SourceObj(); } I want to set the value of mytest6.mytest1 Thanks, Max

EL and regular expression

I am trying to use a Regular Expression in Tomcat 6.0.20 with EL and its not working: <c:set var="info" value="joe2222" /> Here are results = ${fn:replace(info,'\d+','')}<br><br> Error message - org.apache.jasper.JasperException: An exception occurred processing JSP page /jsp/reg2.jsp at line 14 11: 12: 13: <c:set var="info" value="joe2222" /> 14: Here are results = ${fn:replace(info,'\d+','')}<br><br> Please advise.

Top Certifications in all Fields - A Complete Guide

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Motivation of software professionals

Hi all, I am doing a research about motivation in software development, the most efficient practices to motivate software engineers, their popularity, etc. As a part of the research, I am doing an online survey for software engineers and managers in software development. It takes just several minutes and filling it is a good opportunity to share your opinion about the motivation practices being used in the software industry today: http://ask.wizefish.com/en/MotivationSurvey.aspx Anyone who does the survey and leaves any contacts will be sent the results. Also, if someone is

Example of building a list of file names?

Can anyone point me to an example of Java code that searches for all the files within a given Windows directory (and doesn't recurse into subdirectories) and then stores the file names in some kind of array or collection? For example, if my directory was c:\foo, it would store a list of all the files found in the foo directory. I've lost most of my old code examples due to a hard drive crash and feel sure that this kind of code must have been done umpteen times before. I'll write it from scratch if I have to but I'm hoping some kind soul can point me to an example or just post

Java reg exp question

Hi, I'm using Java 1.5. How do I find all strings matching a particular pattern in a larger string? For example, I have HTML page source, and I want to find all the names of the checkboxes where I'm guaranteed the checkboxes will appear on the page like so ... <input type="checkbox" value="true" name="invoicingReport:invoicingTable:1:_idJsp17"/> Thanks for your help, - Dave

call javascript library in jsp

How to call the tablekit javascript library in jsp? I downloaded the tablekit javascript library and put it in the js directory which is in the jsp directory. i.e. the directory is C:\workspace\com.mycomp.data.war\WEB-INF\jsp\js The jsp page is as follows and display correctly with FF and chrome on Windows Vista. However, the column of the page is not sorted by clicking on the column. i.e. the tablekit javascript library sorting function does not work on the web page generated by jsp. <html xmlns="http://www.w3.org/1999/xhtml"> <body> <table border="1" class="sortable r

CardLayout & setting focus problem

Hello - I'm using CardLayout to edit few cards of information. Unfortunatelly there is problem - when I show next card - text box on next card don't receives focus automaticaly. Calling requestFocusInWindow method does not work to. Could you help me. Regards Jacek

Foreign keys in MySQL and referential integrity of Database

A foreign key in a My Sql database is a field (or fields) of a table that points to a primary key of an other table. Such keys are defined in a database to ensure that only fields that supposed to appear in a database may be permitted. What is their requirement ? Why are they useful ? For enhancing the referential integrity of your database, you need foreign key. Read more on how they are defined and created. Learn through some examples. http://sulabhjain.wordpress.com/2010/02/01/foreign-keys-and-referential-integrity-in-database/

Access SNMP using Java

hi friends, could you please tell me how to access the MIB objects of SNMP using Java Code. and i very thankful If u refer any article related to SNMP using Java. Thanks in Advance

Write data to file

Hi All Do you know how to write data to file as below format first data is readable , second data is byte value for (int i = 192 ; i < 223 ; i++) { for ( int j = 129 ; i <= 223 , j++) { output to file i ,j ; output to byte of i , byte f j; } } I does not know how to update below file. import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.channels.FileChannel; public class build_binary { public static void main(String[] args) { Strin

Jave ME and BT

Hi, Where is error in my function to connect with BT (middlet is signed with export root certificate to emulator) this code make exception: -------------------- String url = dAgent.selectService(serverUUID, ServiceRecord.NOAUTHENTICATE_NOENCRYPT, false); ----------------------------- Output: >Searching for service >javax.bluetooth.BluetoothConnectionException: Error in btl2cap::connect () > at com.sun.jsr082.bluetooth.btl2cap.L2CAPConnectionImpl.doOpen(), > bci=79 > at com.sun.jsr082.bluetooth.btl2cap.L2CAPConnectionImpl.<init>(), > bci=64 wha

Create Password Protected PDF from byteArrayInputStream

Hi All, We need to create a password protected PDF to send to Client's browser from JSF web application. We already have the report data in byteArrayInputStream, so we need a Java library to convert it into password protected PDF. Has anybody done this using free Java PDF Library, what is it ? Thank you, xtanto

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Help resolving NoSuchMethodError

Hi, I'm trying to write some JUnit (3.8.1) tests using Maven (1.1, can't upgrade now), and Java 1.5. In my Maven dependency list, I have <dependency> <groupId>xalan</groupId> <artifactId>xalan</artifactId> <version>2.7.0</version> </dependency> And when I run my test, it dies with ... org.apache.xpath.compiler.FunctionTable.installFunction(Ljava/lang/ String;Ljava/lang/Class;)I java.lang.NoSuchMethodError: org.apache.xpath.compiler.FunctionTable.installFunction(Ljava/lan

JNI crash Java and generates strange file - hs_err_pidxxx.log

Hello, I have developed windows application that calls java application using JNI. During this procedure application crashes and hs_err_pidxxx.log (xxx- any numbers) file is generated. I don't know from which part I should look for problem? Is it bug in windows or java application? Thank You

Why does this generic method need a cast on the return value?

I'm constructing a generic method with a couple of type parameters, and the method returns an instance of one of them. The function parameters provided should allow the type parameters to be determined. I've gotten all compile errors out of the generic method, but I'm confused by what happens when I call the method. Eclipse seems to think the method returns "Object", so it says it can't convert the response without a cast. The following is a very simplified version of my class, just to demonstrate the problem. Note that I have two generic methods and calls to them, one of them t

jsp/servlet target

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Any ideas how to avoid this code checker error?

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How to make CORBA pick the appropriate Proxy?

Starting out from an ior String, the app does essentially that: - ORB orb = org.omg.CORBA.ORB.init( new String[0], java.util.Properties() ); - org.omg.CORBA.Object servObj = orb.string_to_object( ior ); - factoryInst = SomeFactoryHelper.narrow ( servObj ); (plus lots of null-checks, and enclosing try-catch.) We use JacORB, and the problem is, that it isn't aware of the proxy that is configured with the browser. The application runs with webstart, and both the hosting website, the jnlp document and the jars named therein are successfully retrieved through t

Read utf-8 char one by one

Hi All how to read utf-8 char one by one ? Below not work. import java.nio.charset.Charset ; import java.io.*; import java.lang.String; public class read_utf_char { public static void main(String[] args) { File aFile = new File("utf8_test.text"); try { String str = ""; char[] ch = new char[]; BufferedReader in = new BufferedReader( new InputStreamReader(new FileInputStream(aFile), "UTF8")); while ( in.read(ch) != -1 ) { System.out.print(ch); } } catch (UnsupportedEncodingException e) { } catch (IOException e) { }

split UTF-8 string to multi UTF8-file

Hi All I have one utf-8, I want split input file into multi UTF-8. Can I using str.substring to extract string ? When input file have BOM code, how to remove the BOM code ? import java.nio.charset.Charset ; import java.io.*; import java.lang.String; public class read_utf { public static void main(String[] args) { File aFile = new File("input.txt"); File oFileDetail = new File("input_det.html"); File oFileHeader = new File("input_hdr.html"); File oFileSKU = new File("input_sku.html"); try { System.out.println("Header"); System.out.println("Detail"); System.out.pr

Using browser's proxy-settings from a javaws-app?

I've got an application running with javaws. The server is behind a socks proxy (which is configured in firefox, and the hosting website works fine). JavaWS (per ControlPanel) is configured to use the browser's proxy- settings and successfully downloads all the .jar-files mentioned in the jnlp-document. The application itself attempts to open a corba connection to the server (the same one that served the jnlp and the jar files), but for some reasons it does not use the proxy-settings, but instead tries to reach the server directly and fails. The application code seems to us