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  • Java checking connection via socket continuously

    - by Onca
    I'm developing a multiclient-server program with Java based on GUI and database. The demand regarding the program from the client side is to make sure all the time that there is a connection to the server, and if the connection is lost (server goes down/problem with socket or stream) it should be notified. In other words I need a solution for continuously checking the connection to the server. What is the best way to do that ?

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  • read, parse and process json (java)

    - by mac
    Guys, simple situation - read a json file discover all key-value pairs compare key-value pairs I tried gson, package from json.org, but can't seem to get far with it. Can someone please provide a clear sample in Java on how to take a file, read it, end up with json objec i can get key/value pairs from thanks so much

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  • Representing a number in a byte array (java programming)

    - by Mark Roberts
    I'm trying to represent the port number 9876 (or 0x2694 in hex) in a two byte array: class foo { public static void main (String args[]) { byte[] sendData = new byte[1]; sendData[0] = 0x26; sendData[1] = 0x94; } } But I get a warning about possible loss of precision: foo.java:5: possible loss of precision found : int required: byte sendData[1] = 0x94; ^ 1 error How can I represent the number 9876 in a two byte array without losing precision?

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  • bulk insert from Java into Oracle

    - by Will Glass
    I need to insert many small rows rapidly into Oracle. (5 fields). With MySQL, I break the inserts into groups of 100, then use one insert statement for every group of 100 inserts. But with Oracle, user feedback is that the mass inserts (anywhere from 1000-30000) are too slow. Is there a similar trick I can use to speed up the programmatic inserts from Java into Oracle?

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  • Java Spring MVC partial views

    - by Tim
    I'm learning Spring MVC at the moment and comparing it to ASP .NET MVC. Is there a way to use partial views in java (like .ascx partials in ASP .NET MVC), so i can associate it with action method of some controller and pass model data to it.

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  • Why did Sun develop the Java platform? [closed]

    - by nic28
    Why did Sun (now owned by Oracle, I know) develop the Java Plaform? How does it make business sense? It seems to me like it would be a very expensive project (also, any ideas on how much they spent/are spending to develop/maintain the platform?). Are they making money by selling support or something?

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  • Java threads for the beginner

    - by Boba
    I've been trying to explain Java threading to a colleague who has never been exposed to multi-threaded applications, but apparently I'm not a very good teacher. Can anyone recommend a good online or offline resource that can explain threading in a simple, step-by-step manner? I know it's a complex topic, but surely there exists an article, book, or other explanation that can result in an "Aha! I get it, finally!" moment.

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  • Java 1.7ea: Files.probeContentType(path) returns null

    - by Cybertizzen
    Hi, I'm having a bit of a strange problem with an application using the Files.probeContentType(path)-method to test for file type: On both my Ubuntu and Fedora systems, it works fine, but when moved to a RedHat Enterprise server (2.6.18-194.el5 #1 x86_64 x86_64 x86_64 GNU/Linux), it only returns null. I'm using java 7 early access (1.7.0-ea-b84). I have to use this version due to functionality that isn't included in 1.6. Does anyone have an idea of what might be the problem here?

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  • Generic solution to deselect buttons in java

    - by Hectoret
    In a set of radio buttons of the same group, only one can be selected at the same time. I would like to have the same behaviour with a normal button. Imagine there's a row of 3 buttons. When a button is selected it changes: but.setSelected(true) and the other two buttons should be NOT selected: but.setSelected(false) Now, is there a generic, simple and clean solution to accomplish that in Java (Swing) ?

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  • Java Applet flickers on redraw();

    - by Dan
    OK so here's my code: http://www.so.pastebin.com/08ghTkQL When I press UP, DOWN, LEFT, or RIGHT... the applet redraws itself and positions the new player... sometimes when I do this (pressing buttons), the whole java applet flickers.... how do I stop this? Thank you.

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  • visualizing enter symbol in java (Serif/SansSerif preferred)

    - by Tom
    How can I display the graphical "enter symbol" within java applet using fonts? I want to show "?", which is U+21B5 DOWNWARDS ARROW WITH CORNER LEFTWARDS. – I want to draw this to applet's screen so that it works in WIN, LINUX, MACOSX, etc. Is there a font available that makes this possible or should I draw it manually somehow? g2d.setFont("SymbolFont??which one"); g2d.drawString(myenterSymbolHere,x,Y);

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  • Custom message with FacesContext.getCurrentInstance().addMessage is not displayed in page (JSF)

    - by bblanco
    Hi! My page: ... <div id="header"> <!-- content header --> </div> <div id="content"> <h:messages /> <h:ouputText value="#{example.text}" /> </div> ... My managedBean: public class ExampleManagedBean(){ private String text; public String getText(){ FacesContext.getCurrentInstance(). addMessage(null, new FacesMessage(FacesMessage.SEVERITY_WARN, "Warning message...", null)); return text; } public void setText(String text){ this.text = text; } } My problem is that the warning message not is rendered in page. Why?

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  • Unable to launch Eclipse 4.1.2 after installing the Eclipse e4 tooling

    - by Kuldeep Jain
    After installing Eclipse e4 Tools in my Eclipse 4.1.2 from update site. I am getting error when launching the eclipse.exe "An error has occurred. See the log file <my_workspace_path>\.metadata\.log". And the content of .log file are: !SESSION 2012-04-06 16:00:01.609 ----------------------------------------------- eclipse.buildId=M20120223-0900 java.fullversion=J2RE 1.6.0 IBM J9 2.4 Windows XP x86-32 jvmwi3260sr5-20090519_35743 (JIT enabled, AOT enabled) J9VM - 20090519_035743_lHdSMr JIT - r9_20090518_2017 GC - 20090417_AA BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=en_US Command-line arguments: -os win32 -ws win32 -arch x86 -clean -console !ENTRY org.eclipse.osgi 4 0 2012-04-06 16:00:17.343 !MESSAGE Application error !STACK 1 java.lang.ArrayIndexOutOfBoundsException: Array index out of range: 1 at org.eclipse.emf.common.util.URI.segment(URI.java:1731) at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.getBundle(ReflectionContributionFactory.java:135) at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:61) at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:53) at org.eclipse.e4.ui.internal.workbench.E4Workbench.processHierarchy(E4Workbench.java:196) at org.eclipse.e4.ui.internal.workbench.E4Workbench.init(E4Workbench.java:122) at org.eclipse.e4.ui.internal.workbench.E4Workbench.<init>(E4Workbench.java:73) at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:293) at org.eclipse.ui.internal.Workbench$3.run(Workbench.java:534) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:520) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:37) at java.lang.reflect.Method.invoke(Method.java:599) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) I also tried the eclipse.exe -clean to launch it but getting same error.

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  • Atomikos vs JOTM vs Bitronix vs ????

    - by HDave
    I am new to JTA and it's underlying transaction managers. Can anyone explain the pros/cons of each of these? Feel free to add others I didn't list in title. Also, don't the major applications servers (WebSphere, JBoss, Glassfish) have their own JTA compliant transaction manager? In those environments, would you still use these third party implementations?

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  • JSF a4j:commandButton not working when 'disabled' is set

    - by Jon
    Hello, When I include a 'disabled' attribute on an a4j:commandButton, the button's action is not performed. Taking the 'disabled' attribute out causes it to work properly. I am not doing any special validation (that I'm aware of) and am not seeing any validation error messages. Here is part of my page: <t:dataTable id="myTable" var="region" value="#{MyPageBackingBean.regions}" width="100%"> ... <a4j:commandButton value="Update" action="#{region.doUpdate}" oncomplete="alert('done');" disabled="#{!empty region && region.messageEmpty}" immediate="true"/> ... </t:dataTable> Any ideas? Thanks! Edit: I tried setting preserveDataModel="true" on the t:dataTable to no avail. I also made a test having an a4j:commandButton and text box with no data table, but the backing bean action is still not being fired: <h:form> <a4j:region> <a4j:outputPanel id="testregion"> <h:messages id="messages"/> <a4j:status> <f:facet name="start"> <h:graphicImage value="/images/progress_indicator.gif"/> </f:facet> </a4j:status> <h:inputTextarea rows="5" value="#{MyPageBackingBean.myValue}" style="width:100%; border: 1px solid #99CCFF;"> <a4j:support event="onkeyup" reRender="testregion" eventsQueue="messageModificationQueue" ignoreDupResponses="true" requestDelay="500"/> </h:inputTextarea> <a4j:commandButton id="doDelete" value="Delete" action="#{MyPageBackingBean.dummy}" reRender="testregion" disabled="#{empty MyPageBackingBean.myValue}"/> <h:outputText value="#{MyPageBackingBean.myValue}"/> </a4j:outputPanel> </a4j:region> </h:form> Here is the new backing bean code used for testing: private String m_myValue = null; public String getMyValue() { return m_myValue; } public void setMyValue(String value) { m_myValue = value; } private String mystr2 = null; public String dummy() { mystr2 = "hello"; return null; } Thanks!

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  • File upload and Download in a web app using struts2

    - by lakshmanan
    Hi In struts2 upload methods, can I choose where the uploaded file must be saved. I mean, all the examples in web ask me to store in WEB-INF which surely is not a good idea. I want to be able to store the uploaded file in any place in my disk. How should i do it? Can i do it with help of ServletContextAware interceptor ?

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  • JSF - get managed bean by name

    - by Konrad Garus
    I'm trying to write a custom servlet (for AJAX/JSON) in which I would like to reference my @ManagedBeans by name. I'm hoping to map: http://host/app/myBean/myProperty to: @ManagedBean(name="myBean") public class MyBean { public String getMyProperty(); } Is it possible to load a bean by name from a regular servlet? Is there a JSF servlet or helper I could use for it? I seem to be spoilt by Spring in which all this is too obvious.

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