Hello,I used "trivial" UDPClient / Server example to send datagrams from one local interface (eth1) on my Linux box to Datagram server on yhe host not included into local routing table and I tried to capture outgoing udp traffic on interface eth1. I've got IOException"ICMP: destination ...

Hi =)I'm kinna newbie to Java so sorry if it is to stupid.I'm correctly receiving a Collection from a Method. Like this..Cliente arturo = new Cliente(47451001);Collection reservas = arturo.getReservas();It's an ArrayList Collection. Now I would like to iterate over it to perform something ...

Can anyone please tell me what is wrong with the following program?class Vehicle{String name;double capacity, efficiency, miles;static int noOfVehicles;Vehicle(String n, double cap, double eff, double mi){name = n;capacity = cap;efficiency = eff;miles = mi;}Vehicle(){noOfVehicles = noOfVehicles ...

Hi,I am facing a problem, I want to update tables that is in my local host server which is now I m using Access , and i want to update my values in server database which is MySQL, is dere any option to do dat...please help me out of dis problem...thanks

I want to transfer text file from windows machine to UNIX using only SCP(Secure Copy). i know using WinSCP i can do that . but i want to know how can i do using JAVA Programing.

Hey I hear for netbeans there is an extension (or maybe it is built in) to do reflection/access metadata at compile time.Anyone hear about this or know where I can find more info on this? Or maybe it is for a different IDE or a stand alone tool?compile-time access would be ideal since J2ME ...

I am having trouble understanding how iterators are supposed to be implemented in a working program. I am trying to make an ArrayList that I can iterate through and supports wrap-around. I'm not sure if the methods are one-hundred percent correct since I can't even get a working driver to ...

how to close client to dont get java.net.SocketException: Connection reseti dont know why Telnet conection is okI know that i close socket i wrong order but how to do this properly

Hi All,I currently can read a csv file into my console using:BufferedReader in = new BufferedReader(new FileReader("/Users/Admin/Desktop/list.csv"));int numberOfRows = 0;int numberOfColumns = 0;String line;while ((line = in.readLine()) != null) {System.out.println(line);if(line!= ...

Hi there,I know this thread topic seems a bit non-sense, but I just can't figure how to do what I need... And what I need is to make decisions in the current input stream bytes based on future bytes.I know all about mark() and reset() methods, but they just don't work one any InputStream, and ...

Hi,This is code snippet from Angelica Langer's FAQ:abstract class Node <N extends Node><N>> {private final List<N> children = new ArrayList<N>();private final N parent;protected Node(N parent) {this.parent = parent;if(parent!=null)parent.children.add(this); // error: ...

Hello allI have uploaded a file from an application i developed and i want to download this file from another application. The code is public static void FTPcon() throws FtpException{String hostname = "my.ftp.server";String username = "myusername";String password = "mypass";Ftp ftp = new ...

I have the following classes:Father.javapackage mypackage;import java.lang.reflect.Field;public class Father {protected String name;public String getName() {return name;}public void setName(String name) {this.name = name;}public void examine() {Class me = getClass();Field[] fields = ...

Can anybody please give a scenario to the following question?When to explicitly specify the type argument for a generic method or constructor?Consider the generic method show() in class Test:class Test {<U> void show(U u) {System.out.println("u = " + u);}}This method can be called as ...

Hi,I have a swing application with JTable running on JDK1.6.0.It has been getting exceptions but I can't find the error source(file name and line number).Can anybody help me how to solve this problem please.Thank you in advance.Exception in thread "AWT-EventQueue-0" ...

Hi. I have installed j2sdk6.0 on my Red Hat Linux 9.0 box. However, applications that I run (for instance my prevoius applications and NetBeans 5.5) hung unexplained in the middle of use. There is no error report and I have to kill java and start all over again. Is this an incompatibility ...

Hello! I want to set a proxy in a java Applet. how dp i do it?when i used System.getProperties().put("proxySet","true");It showd me an error. can anyone please tell me how do i do it?

Hello frnds,If perfer Arraylist than vector then, is there is any increase in performance.. ?or should i go with the Vector ?i am so confused ...plzzz help me.best regards,Pandev84

Hey,Is there any way to set 'terminalserverprofilepath' attribute in ActiveDirectory through JNDI?I understand that Microsoft had silly ideas making this attribute binary or something... any way of doing this?Thanks in advanced,Asaf.

Ok , i've asked this question b4 and i don't think i was that clear on my line of questioningI've spent the last 4 days researching on how to get around this problem with no luck. I want to access a clients serial port through my server. My server brings up a browser application(Ajax) when ...

An object is created from another object. The child object does not know anything of its parent by normal Java means.But I need to get from that child a reference to the object which created it, no matter if the child contains a reference to its father or not.Is this possible with reflection? ...

Hi all,I need a functionality that the ServerSocket accepts only if the Socket Inet Address matched with the given InetAddress. It should be done before accept() in server socket.Thanx in advance.Tiger

Hi!I'm sort of an experienced Java programmer, in the sense that I program regularly in Java. However, I am not experienced enough to understand the small design specifics of the Collections Framework (or other parts of Javas standard library).There's been a number of minor things that bugged ...

My goal is to create a function that creates a string from an ArrayList, which I can easily do in many ways. Then the caller needs to reconstruct that ArrayList, which is where I'm having trouble. Does there exist a function to do that -- to go from the serialized ArrayList string to the ...

I'm trying to dynmically load some junit classes and I'm having a serious problem. Loaded classes have null values. Meaning the Class is found and created, and is not itself null, but all of it's members are null (such as method names). Currently, I'm using the TestCaseClassLoader from ...

I am having a problem on downloading a zip file(file size is about 2Mb). Sometimes I can get a complete file and can open the file, sometimes the zip file is chunked(the file size is smaller than the right one), so I can't open it. The file content is stored in a blob field. The code first ...

Hi!I am having trouble figuring out how to change the timeout that occurs when a server vanishes and the client, which has not yet been sent a JMXConnectionNotification, unwittingly executes a method such as mbsc.queryNames().My code can currently wait as long as 120 seconds before a ...

Hi All ,trying to sort a HashMap then print it to a file.I have data like in a csv file:Full Name,Email,Phone,Street Address,City,State,ZipJames Madison,jmadison@whitehouse.gov,201-555-1234,12 Main Street,Newark,NJ,11346theodore roosevelt, teddy@whitehouse.gov, 415-555-1234, 1239 Geary, San ...

I'm confused about these methods:public boolean remove(Object object)public boolean removeAll(Collection<?> collection)public boolean contains(Object object)public boolean containsAll(Collection<?> collection)public boolean retainAll(Collection<?> c)Shouldn't the signatures ...

Currently, method Thread.stop, Thread.destroy are deprecated.How can I stop/destroy a thread safely?Or a thread is needed to be stopped when it finish its job?Thanks!

From an InputStream coming out of a file can we find out the MIME type of that file? I can't rely on file extension etc. Let me know if someone has tackled this issue or has any insights. Thanks in advance

anyone want to share the implementation/resolution of an annotated singleton, e.g.@Singleton // ?public class Foo { @Singleton // ? private Bar bar; @Singleton // ? public Foo() ...

anyone want to share the implementation/resolution of an annotated copy-on-write proxy, e.g.@CopyOnWrite // ?public class Proxy { @CopyOnWrite // ? private byte[] bigBuf; @CopyOnWrite // ? public Proxy() ...

Hi im a bit confused,can som one pls explain the difference between Serial, Socket and Telnet connections.tnx in advance

Hi Friends , Can anybody tell me how to sort List elements ? I mean to say that suppose a List object have three state i.e. Fname, Emp-id,Lname , so how can i sort this List object against their Emp-id.Pls , help me out in this regards.

My problem can be summarized like this :We have a interface definedpublic interface DataStructure{ // ... getters only}Then, an implemetation of the interfacepublic class DataStructureTo implements DataStructure{ // implemetation of the getters only}We then defined the Editable versions of the ...

How to make an array as dynamic growing array in java?instead of using collections.

can somebody tell me how can i get the DNS' IP? is there a method that can get the ip of the dns?thanks in advance!

Hi there,I have a very weird problem with the mentioned exception.I try to call a remote EJB to get details from a certain object (just get the EJB and related information, put the data in transfer objects and transport it to the struts action with facades and services).Weirdest is this:The ...

I have a properties file that contains IPAddresses.. I use it to record searches and hits made by those who access my page.. The thing is I need to pass the values to an ArrayList to make my life easier..Any suggestions as to how?Thanks in advance..!

HiI'm having some problems with my connection pool because in my network, after some time of inactivity, I lose the connections between the tomcat and the database.What I need is a way to restart the pool if lose the connection to the database.Anyone know something to do this?My pool is ...

I have such problem: private HashSet connectionName;.........public String getConnectionName(int i){Object[] strArray = new String[connectionName.size()];strArray = connectionName.toArray();return strArray[i].toString(); //I keep there String values}The problem is: the input element order ...

Hi Guys, I need a great help from all of you. i am using jconsole to monitor my java application memory.After some 5 days of continuous monitoring through jconsole, i got a "java.lang.OutOfMemoryError: Java heap space" in command line and no progress after that(because of out of memory error). ...

Hi all,I need to open a RandomAccessFile() for reading and writing and saw the docs for the constructor RandomAccessFile(File file, String mode).Was just wondering if there is any performance gain if I use "rwd" for mode, instead of "rw".Thanks,Cristi

May i know which one and why it's the best among the other collection classes?

Does anybody know if there is a particular reason for why the indexSublist\indexLastSublist methods in the Collections class use the brute force algorithm instead of a more sophisticated matching algorithm, like Knuth-Morris-Pratt for instance?Would that be overkill, perhaps?Knuth-Morris-Pratt ...

Hi, I have a problem with subtyping and autoboxing. Can anybody please help me to know the reason for this.public class GenericSubType<T extends Integer> {T iVal;public GenericSubType(T t){iVal = t;}public static void main(String args[]) {GenericSubType<Integer> gst = new ...

First of all, am I in the correct forum. The code is below, it may be way off the mark, but I think it's another problem:at the bottom of the code, I put my e-mail address in the Address object. But the exception I get is:Exception in thread "main" com.sun.mail.smtp.SMTPSendFailedException: ...

Hi,I'm developing a client that interacts with a comet server (comet allows http connections to be used for multiple inputs and outputs on same connection -- not single request, single response). I've found that I can't use HttpURLConnection because it doesn't allow writing to its output ...

Why is the obj of Type Object and not Serializable. According to my understanding the obj should have implemented serializable or inherited it from its object hiererchy. Then why is this restriction not imposed at run time?