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• Why does this code sometimes throw a NullPointerException?

  - by Tiberiu Hajas

  Consider the following Java source: if( agents != null ) { for( Iterator iter = agents.keySet().iterator(); iter.hasNext(); ) { // Code that uses iter.next() ... // } } The agents is a HashMap. Why does the for statement sometimes throw a NullPointerException? Thank you.

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• How can I send a confirmation email to users of my application?

  - by giri

  Hi I have designed a chat application where different users can create the account, but I do not know how to send a confirmation email to the users. Since I collect their e-mail address in the registration form, how can I send mail to those addresses in Java?

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• question about charAt function

  - by davit-datuashvili

  i know java API function charAt for example String s="dato" char r=s.charAt(0); r is equal d but my question is how realy it works or what function can i use instead of charAt function to get same result? thanks

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• Struts 1.1 - No bean specified Error

  - by Ruepen

  What would the possible scenarios be in which I would get this error produced from a struts web app? java.lang.IllegalArgumentException: No bean specified

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• Network Differences

  - by Chris

  I am busy working on a java app to run on blackberries but on some devices i am testing on, the code does not seem to be working and im having a hard time pinpointing where the problem lies. My question is: Could the problem with some phones working and not working have t odo with the type of network they are running on such GSM vs CDMA and would the code that stops working on some devices be in one of the following areas: 1) Listeners - such as MessageListener and Phone Listener 2) UI Objects - simple test labels and buttons 3) Connection to a web service using ksoap2

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• best software synthesizer for piano

  - by pianoman

  Could someone recommend a good and inexpensive software synthesizer which generates really good piano sound (sample-based); support for other instruments is not required. OS: Windows or MacOS. Java interface would be a great asset.

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• The device is not connected exception

  - by Dani

  I try to open a large number of files but after 5000 files or so I get Exception in thread "Main" java.io.IOException: The device is not connected Is this the expected behavior? Is there a way around it? I want to leave my code as straightforward as possible.

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• Get the number of packages transmitted per connection

  - by Daniel

  How do I get the number of packages transmitted per TCP connection? I am using Java, but i know I will have to fetch the number from the underlying OS, so this quastion applies to Linux and Windows operating systems and will have different answers for each of them, I assume. I need this information to profile the network load of an application which seems to send too many small packages by flushing the socket streams too often.

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• Why are dates calculated from January 1st, 1970 ?

  - by Vijay Shanker

  Is there any reason behind using date(January 1st, 1970) as standard for time manipulation? I have seen this standard in Java as well as in Python. These two languages I am aware of. Is other popular languages also follows the same standard? Please describe.

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• jQuery template and Backbone.js

  - by testndtv

  I am trying to create an app which uses a combination of jQuery templates and Backbone.js I have very little experience in both of them (though I know jQuery) Could you please provide some good examples where jQuery templates and Backbone.js are used effectively. Also I am loooking at using JSON for the model/data and trying to persist the data (I use Java at the backend)..So looking for ideas on how that can be integrated? Thank you.

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• Where can I find a good introductory tutorial for Spring?

  - by will

  I am a Java developer but up to now have not had any hands on experience using the Spring framework. Does anyone know of anyone good online tutorials that explain the basics and offer good examples and sample code.

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• Get all characters from a string with their number

  - by terence6

  How in Java can I get list of all characters appearing in string, with number of their appearances ? Let's say we have a string "I am really busy right now" so I should get : i-2, a-2, r-2, m-1 and so on.

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• Facebook content locker function share

  - by Vicent D

  I made a facebook content locker(PHP + HTML + JAVA) for my website, so to access the site user must press the 'facebook share "in the middle of the screen.After pressing this button, it opens facebook pop-up and user can share or NOT my link because locker disappear in 30 seconds since clicked on this button(so I put it). Is there any possibility, any function that content locker disappear only after the user has actually given share in facebook pop-up window,I mean after my site address appears on facebook ? Thanks a lot

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• how read a remote file with GWT

  - by alessandro

  Hi all! I need to read a file located on a server but I see that in GWT is not possible use some java library. what I have to do?

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• Null pointer exception on .iterator() call

  - by Peter

  I'm getting a strange NullPointerException, evidently thrown by the following line of code: Iterator<Note> it = notes.iterator(); I've checked, and at the time the java.util.TreeSet notes is always non-null (with 15 elements). The TreeSet API says nothing about iterator() throwing NullPointerExceptions. What else could be going here?

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• How to handle error in this case? By Exceptions or boolean or something else

  - by TP

  I am trying to create a Response class in Java which has a method void setResponse(String response); Different response subclasses will have different requirements for the response. The string that is passed to the function is received from the user. What is the correct way of handling a wrong response? Should the function throw an exception like IllegalResponseException Should the function be declared like boolean setResponse(String response, String errorMsg) and return false if the response is wrong and set the error message to the appropriate value

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• Floating point arithmetics restricted to integers

  - by user396672

  I use doubles for a uniform implementation of some arithmetic calculations. These calculations may be actually applied to integers too, but there are no C++-like templates in Java and I don't want to duplicate the implementation code, so I simply use "double" version for ints. Does JVM spec guarantees the correctness of integer operations such a <=,=, +, -, *, and / (in case of remainder==0) when the operations are emulated as corresponding floating point ops? (Any integer, of course, has reasonable size to be represented in double's mantissa)

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• Set Date in a single line

  - by hibernate

  According to the java API, the constructor Date(year, month, day) is depreciated. I know that I can replace it with the following code: Calendar myCal = Calendar.getInstance(); myCal.set(Calendar.YEAR, theYear); myCal.set(Calendar.MONTH, theMonth); myCal.set(Calendar.DAY_OF_MONTH, theDay); Date theDate = myCal.getTime(); However, I would like something shorter to replace it with (ideally one-two lines). Any suggestions?

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• j2ee good and reliable books

  - by user161004

  Can anybody suggest some good books for starting J2EE? I have done Core and Advanced Java ( up to Swing).

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• Eclipse Type Hierarchy Question

  - by Tom Tresansky

  In Eclipse, the Java Method Override Indicator is the little upwards arrow next to a method in the Type Hierarchy view. A solid arrow means a method overrides an existing method lower in the hierarchy. What does the hollow arrow mean? Do annotations effect either arrow?

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• Can I assign array size using NSMutableArray?

  - by Tattat

  I used to be a Java Programmer, which the array need to declare the very first time, like this: int[] anArray; // declares an array of integers anArray = new int[10]; // allocates memory for 10 integers I don't know whether the Objective C , NSMutableArray also give me this ability or not. Actually, I want to make a 10*10 array. thz in advance.

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• What is the performance cost of calling Thread.isInterrupted()?

  - by Michael Barker

  From the java sources, it look like to drops into native code. Is the cost roughly equivalent to a volatile read or does it need to acquire a lock of some type?

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• Strange eclipse error

  - by Gandalf StormCrow

  Has anyone expirience this error before: this happens when I hit CTRL + space , here is the error : For those who has tinyurl blocked: This compilation unit is not on the build path of the java project. This is a maven project, mvn eclipse:eclipse doesn't help I mean it compiles and runs just fine just something is wrong and I can't figure out what. I checkouted this project from SVN, it wasn't developed on my PC.

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• The fundamentals of Hash tables?

  - by kylex

  I'm quite confused about the basic concepts of a Hash table. If I were to code a hash how would I even begin? What is the difference between a Hash table and just a normal array? Basically if someone answered this question I think all my questions would be answered: If I had 100 randomly generated numbers (as keys), how would I implement a hash table and why would that be advantageous over an array? Psuedo-code or Java would be appreciated as a learning tool...

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• How to switch between the two spring context in runtime?

  - by Selector

  I have current ApplicationContext and I want to replace it by newAppContext ApplicationContext currentAppContext = getOldAppContext (); ApplicationContext newAppContext = loadAppContext (); If i do: currentAppContext.stop(); currentAppContext.close(); currentAppContext= newAppContext; And then try: currentAppContext.getBean("SampleBean"); I have follow error: java.lang.IllegalStateException: BeanFactory not initialized or already closed - call 'refresh' before accessing beans via the ApplicationContext How to substitute spring context?

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