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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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• find decimal in a given number

  - by chandu

  Hi, How can i find decimal(dot) in a given number in java. I am getting input from user, he may give integer or float value. I need to find he entered integer or float , is it possible? if yes could u tell me please. -- Thanks

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• Regex for Eclipse/Flash Builder File Search for comments?

  - by Brian Bishop

  In Eclipse (and Flash/Flex Builder) you get the option with Ctrl+Shift+F to do a file search and look for a regular expression. Would be a real handy thing to know. I want to find the word negate if it appears in a Flex/java comment like the following: // It was negated because or /* The negate option was.... */ or /** * We have to negate the value */ Any ideas? Will test them out at http://www.regexplanet.com/simple/index.html

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• Lightest Database to be packed with an application

  - by Yatendra Goel

  I am developing a Java Desktop Application and want a light database that can be used with Hibernate and that can be packed with an application. I was going to use Derby database. It's size is near 2 MB. But before that I wanted to have views of experts on SO. Will it work with Hibernate? Actually, I am new to Hibernate and was studying that it requires a Dialect for a database so Is Hibernate has dialect for Derby?

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• caching the form values

  - by ha22109

  Hello , I have a search form.When user post the search form i take the user to the result page which has search form and results of the search.Now if the user click on the back button of the browser ,i want that he should be the search page form filled with his values.I am using java

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• How does the Eclipse debugger gets the information about private variables inside the class?

  - by flash

  this was an interview question posed to me..I vaguely answered it uses Java reflections..but I was not sure. how does that work?

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• Execute a default task in ANT in case of failure

  - by elos

  Hi, I'm currently using ANT for building my Java project on a Windows XP machine. In my build.xml file I've defined 3 task and I would like that,in case of fail,a default task be executed before closing the building and exiting (like a recovery procedure). I would like to know if it's possible. thanks

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• net.sf.json.JSONObject adds backslashes where it's not expected ?

  - by cx42net

  Hi there, I'm loosing my hair trying to figure out why net.sf.json.JSONObject add extra backslash where it shouldn't on my java code : JSONObject obj = new JSONObject (); obj.element ("column_name", "<a href=\"#\" title=\"test\">Test !</a>"); will output : <a href=\"#\" title=\"test\">Test !<\/a> with an extra "\" near <\/a. How can I avoid this behavior ? Thanks for your help !

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• Object or primitive type

  - by John

  Hi, Can someone explain to me the usage of Integer, Boolean etc in place of their primitive types in JAVA? I can't seem to grasp the advantages their are providing. They seem to create unnecessary problems of handling null values. Thanks!

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• Given a list of IP address, how do you find min, max ?

  - by zeroin23

  In Java, i have an arrayList of ip address. how do i find the min and max ? I have used the Collection.min() but it doesnt work given a case like : 192.168.0.1 <--min 192.168.0.250 192.168.0.9 <--max how do i return 192.168.0.1 <--min 192.168.0.250 <--max instead?

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• How to create a process that cannot be killed?

  - by rgksugan

  I am running my java application. It shows up in the process tab of the task manager. I dont want users to kill that process? And if possible i dont want my process to be in the process list also.

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• UML reverse engineering tools for Eclipse or Maven

  - by Marco

  Hi, do you know any good reverse engineering tool that creates UML diagrams from Java code and Hibernate mappings across multiple projects, in Eclipse or Maven (not in the Javadoc)? Thanks

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• How to find out or where to specify path of the JavaEE project?

  - by Milan

  I develop Java EEapplication and I have to create some files in the src folder in the my application. But I dont where or how to specify the path. I want my application to be portable. It means just to say TestProject/src/.... and not C:/bla/bla/TestProject/src/... do we specify this in some app file like web.inf, meta-inf or its just some trick. Thanks!

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• How was the first release of JDK Unit Tested?

  - by Sameer Patil

  Can someone please explain the following How was the first JDK release unit Tested? Since Junit came after Java how did they do it? Are the current releases using Junit to test the JDK API? Regards

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• Array increment operator

  - by Stardust

  Could any one please tell me the meaning of "++" with array in the following code in Java: int [ ] arr = new int[ 4 ]; for(int i = 0; i < arr.length; i++){ arr[ i ] = i + 1; System.out.println(arr[ i ]++); } what is arr[ i ]++ meaning in above code, and why we can't do like: arr[ i ]++ = i + 1;

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• looking to scan documents directly to be uploaded to a webpage

  - by Tom

  I was hoping to do this from a flash plugin, kind of how flash accesses the microphone or webcam but it doesn't seem possible. Is this going to be possible using Java, or ActiveX, or some other strategy that I haven't looked at yet? The idea is to do it without a client install, or at least something lightweight and browser and platform independent, (and possibly the moon on a stick as welll ;-))

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• How to convert an ArrayList containing Integers to primitive int array?

  - by Snehal

  I'm trying to convert an ArrayList containing Integer objects to primitive int[] with the following piece of code, but it is throwing compile time error. Is it possible to convert in Java? List<Integer> x = new ArrayList<Integer>(); int[] n = (int[])x.toArray(int[x.size()]);

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• Resolving Session Fixation in JBoss

  - by Warren Blanchet

  I need to prevent Session Fixation, a particular type of session hijacking, in a Java web application running in JBoss. However, it appears that the standard idiom doesn't work in JBoss. Can this be worked around?

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• Prevent drop down list options scrolling on Windows in SWT

  - by parxier

  One of the drop down lists in my Java SWT application has 8 fixed options. When I click on it only 5 first options are visible and I have to scroll the list down to view the rest. Is there any way to force it to make all options visible without having to scroll down? There is another similar .NET application that has same drop down list with the same options and they all are visible without having to scroll down!

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• What is the difference between quicksort and tuned quicksort?

  - by kunjaan

  What is the fundamental difference between quicksort and tuned quicksort? How does Java decide to use this instead of merge sort?

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• how can we get images through cache once they are in memory and how to make such a logic

  - by sharma

  Dear all, I making a web application,i want to store images in cache ,next time i dont want to get images from network.how can i implement using java,using weakhaspmap or hashmap.

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• How is the implementation of LinkedHashMap different from HashMap?

  - by Passionate programmer

  If LinkedHashMap's time complexity is same as HashMap's complexity why do we need HashMap? What are all the extra overhead LinkedHashMap has when compared to HashMap in Java?

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• How does polymorph ambiguity distinction work?

  - by Pentius

  Given I have a class with two constructors: public class TestClass { ObjectOne o1; ObjectTwo o2; public TestClass(ObjectOne o1) { // .. } public TestClass(ObjectTwo o2) { // .. } } What happens, if I call: new TestClass(null); How to determine the correct method to call? And who determines that? Are there differences between Java and other OOP languages?

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• how to open jar selection dialog at the eclipse pulgin code...

  - by songsungkyun

  Hi all. At Project Properties Java Build Path Libraries tab you click Add Jars button, you will see the JAR Selection dialog. I like to open this JAR Selection dialog on my plugin code. How to open this?

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• swing syntax highlighter

  - by Simon

  Hi, I need some advice on creating a syntax highligher for java application using swing. The application should allow to edit a file and highlight syntax. I don't know the swing library, what should I look for?

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