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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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• 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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• Clean multiple JTextField

  - by redmarv

  Hi all! I was wondering about how to clean multiple JTextField in a Java applicatio, without setting the text with an empty string for each field. Any suggestions?

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• Convert an ArrayList to an object array

  - by marionmaiden

  Hello, Is there a command in java for conversion of an ArrayList into a object array. I know how to do this copying each object from the arrayList into the object array, but I was wondering if would it be done automatically. I want something like this: ArrayList<TypeA> a; // Let's imagine "a" was filled with TypeA objects TypeA[] array = MagicalCommand(a);

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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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• How to generate one jar with different executable classes in maven2?

  - by GuidoMB

  I have a big project that uses maven and I'm creating the project's jar. The problems is that the project has several classes that can be executed. How can I accomplish this? Every time that I try to execute a class I get this message java -jar library.jar ExecutableClass1 Failed to load Main-Class manifest attribute from library.jar

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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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• JSplitPane SetDividerLocation Problem

  - by Goutham

  I have a JSplitPane which when shown should split the pane by 50%. Now on giving an argument of 0.5 (as suggested) to setDividerLocation, Java seems to treat it as a normal number instead of a percentage. As in, the divider, instead of going to the middle of the pane, is almost at the start of the left pane (the pane is vertically split). Any work arounds?

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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 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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• 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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• Build a road network out of shapefile coordinates

  - by Sameer

  I want to build a road network from the ESRI shapefiles. I am able to read the data from the .shp files but unable to proceed any further with building the road network out of the shapefile coordinates and display it on the screen. I am not that expirienced in Java. I would appreciate any kind of suggestions on how should i proceed now.

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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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• 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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• How can I get to know my program has been terminated normally?

  - by girinie

  Hi I like to know If I have written a program in java How can I get to know my program has been terminated normally or exited normally?

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• Automation of EAR packing

  - by glebreutov

  I need to automate packing of Java EE projects into EAR archive in Eclipse. The most easy way, I think, is using Ant script. But writing of Ant from start is routine and long task. Is there a way to generate Ant script based on my actions in eclipse (like macros in MS Office)? Or, maybe, exists easier way to do this? Thanks!

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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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• Disable JPanel with visual effect

  - by Ryan

  I'm looking for a good way to disable a JPanel. I'm using a MVC design for a Java Swing GUI. I want the JPanel to be disabled while the model is processing stuff. I've tried setEnabled(false). That disables user input on the JPanel, but I'd like it to be grayed out to add a more visual effect. Thanks in advance!

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