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  • Check if thread is EDT is necessary?

    - by YuppieNetworking
    Hello, I have an UI implemented with Swing. One component does some work that may take some time, so I use SwingUtilities.invokeLater. However, I was reading some old code and found this in an ActionListener: if (!SwingUtilities.isEventDispatchThread()) { SwingUtilities.invokeLater(new Runnable() { public void run() { // code X } }); } else { // code X } I thought that it made sense since it separates code X from the EDT. However, I found it error-prone since I have used it a couple of times and both times I forgot the else part. The question is: is the SwingUtilities.isEventDispatchThread() checking necessary? Or could I assume that I am not in the EDT and always use invokeLater? Thanks a lot.

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  • How to make an eclipse plugin for text comparison of two files

    - by Snehal
    I plan to make a text comparison plugin for eclipse which basically provides a visual aid for changes that are required in the file and allows the user to accept or reject them. It is very much in lines of subclipse for svn or any other code comparison tools. I already found a good source to perform the text comparison but I'm looking for some pointers regarding the implementation of the UI in eclipse.

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  • Quartz Thread Execution Parallel or Sequential?

    - by vikas
    We have a quartz based scheduler application which runs about 1000 jobs per minute which are evenly distributed across seconds of each minute i.e. about 16-17 jobs per second. Ideally, these 16-17 jobs should fire at same time, however our first statement, which simply logs the time of execution, of execute method of the job is being called very late. e.g. let us assume we have 1000 jobs scheduled per minute from 05:00 to 05:04. So, ideally the job which is scheduled at 05:03:50 should have logged the first statement of the execute method at 05:03:50, however, it is doing it at about 05:06:38. I have tracked down the time taken by the scheduled job which comes around 15-20 milliseconds. This scheduled job is fast enough because we just send a message on an ActiveMQ queue. We have specified the number of threads of quartz to be 100 and even tried with increasing it to 200 and more, but no gain. One more thing we noticed is that logs from scheduler are coming sequential after first 1 minute i.e. [Quartz_Worker_28] <Some log statement> .. .. [Quartz_Worker_29] <Some log statement> .. .. [Quartz_Worker_30] <Some log statement> .. .. So it suggesting that after some time quartz is running threads almost sequential. May be this is happening due to the time taken in notifying the job completion to persistence store (which is a separate postgres database in this case) and/or context switching. What can be the reason behind this strange behavior? EDIT: More detailed Log [06/07/12 10:08:37:192][QuartzScheduler_Worker-34][INFO] org.quartz.plugins.history.LoggingTriggerHistoryPlugin - Trigger [<trigger_name>] fired job [<job_name>] scheduled at: 06-07-2012 10:08:33.458, next scheduled at: 06-07-2012 10:34:53.000 [06/07/12 10:08:37:192][QuartzScheduler_Worker-34][INFO] <my_package>.scheduler.quartz.ScheduledLocateJob - execute begin--------- ScheduledLocateJob with key: <job_name> started at Fri Jul 06 10:08:37 EDT 2012 [06/07/12 10:08:37:192][QuartzScheduler_Worker-34][INFO] <my_package>.scheduler.quartz.ScheduledLocateJob <some log statement> [06/07/12 10:08:37:192][QuartzScheduler_Worker-34][INFO] <my_package>.scheduler.quartz.ScheduledLocateJob <some log statement> [06/07/12 10:08:37:192][QuartzScheduler_Worker-34][INFO] <my_package>.scheduler.quartz.ScheduledLocateJob <some log statement> [06/07/12 10:08:37:220][QuartzScheduler_Worker-34][INFO] <my_package>.scheduler.quartz.ScheduledLocateJob - execute end--------- ScheduledLocateJob with key: <job_name> ended at Fri Jul 06 10:08:37 EDT 2012 [06/07/12 10:08:37:220][QuartzScheduler_Worker-34][INFO] org.quartz.plugins.history.LoggingTriggerHistoryPlugin - Trigger [<trigger_name>] completed firing job [<job_name>] with resulting trigger instruction code: DO NOTHING. Next scheduled at: 06-07-2012 10:34:53.000 I am doubting on this section of the above log scheduled at: 06-07-2012 10:08:33.458, next scheduled at: 06-07-2012 10:34:53.000 because this job was scheduled for 10:04:53, but it fired at 10:08:33 and still quartz didn't consider it as misfire. Shouldn't it be a misfire?

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  • maven dependencies and jetty - avoiding deploy

    - by James Cooper
    Hi, I have a project with 3 artifacts: common - entities, business logic. no UI code webapp-a - a public web app webapp-b - an admin web app webapp-a and webapp-b depend on common. common is configured to deploy to a local maven repo. so far so good. I have IntelliJ configured so that each artifact is a separate module. Module dependencies are configured properly. I can add a new method to a class in common and immediately use that method in a class in a webapp. However, when I run mvn jetty:run it uses the currently deployed common snapshot in my repository. It does not use my local classes. If I add a method to a class in common, it compiles fine, but blows up at runtime. So is it possible to either: a) Convince jetty:run to use my local common build output or b) Deploy my common output to my local ~/.m2/repo while I'm testing locally before I want to commit/deploy or c) some other solution? thank you! -- James

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  • Abstract Base Class or Class?

    - by Mohit Deshpande
    For my semester project, my team and I are supposed to make a .jar file (library, not runnable) that contains a game development framework and demonstrate the concepts of OOP. Its supposed to be a FRAMEWORK and another team is supposed to use our framework and vice-versa. So I want to know how we should start. We thought of several approaches: 1. Start with a plain class public class Enemy { public Enemy(int x, int y, int health, int attack, ...) { ... } ... } public class UserDefinedClass extends Enemy { ... } 2. Start with an abstract class that user-defined enemies have to inherit abstract members public abstract class Enemy { public Enemy(int x, int y, int health, int attack, ...) { ... } public abstract void draw(); public abstract void destroy(); ... } public class UserDefinedClass extends Enemy { ... public void draw() { ... } public void destroy() { ... } } 3. Create a super ABC (Abstract Base Class) that ALL inherit from public abstract class VectorEntity { ... } public abstract class Enemy extends VectorEntity { ... } public class Player extends VectorEntity { ... } public class UserDefinedClass extends Enemy { ... } Which should I use? Or is there a better way?

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  • Blackberry read local properties file in project

    - by Dachmt
    Hi, I have a config.properties file at the root of my blackberry project (same place as Blackberry_App_Descriptor.xml file), and I try to access the file to read and write into it. See below my class: public class Configuration { private String file; private String fileName; public Configuration(String pathToFile) { this.fileName = pathToFile; try { // Try to load the file and read it System.out.println("---------- Start to read the file"); file = readFile(fileName); System.out.println("---------- Property file:"); System.out.println(file); } catch (Exception e) { System.out.println("---------- Error reading file"); System.out.println(e.getMessage()); } } /** * Read a file and return it in a String * @param fName * @return */ private String readFile(String fName) { String properties = null; try { System.out.println("---------- Opening the file"); //to actually retrieve the resource prefix the name of the file with a "/" InputStream is = this.getClass().getResourceAsStream(fName); //we now have an input stream. Create a reader and read out //each character in the stream. System.out.println("---------- Input stream"); InputStreamReader isr = new InputStreamReader(is); char c; System.out.println("---------- Append string now"); while ((c = (char)isr.read()) != -1) { properties += c; } } catch (Exception e) { } return properties; } } I call my class constructor like this: Configuration config = new Configuration("/config.properties"); So in my class, "file" should have all the content of the config.properties file, and the fileName should have this value "/config.properties". But the "name" is null because the file cannot be found... I know this is the path of the file which should be different, but I don't know what i can change... The class is in the package com.mycompany.blackberry.utils Thank you!

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  • Specify JDK for Maven to use

    - by DanInDC
    Hi all. I am trying to build a Hudson plugin I've modified and it requires jdk1.6. This is fine, but I don't see how I can tell maven where the different jdk is. I've found few mentions on the internet but they don't seem to apply to me. Some suggest adding some config to .m2/settings.xml but I don't have a settings.xml. Plus, I don't want to use 1.6 for all maven builds. One kink is I am using mvn in cygwin, if that matters at all. It appears I should be able to make the specification in the project pom file, but the existing pom is pretty bare. So bottom line is, is there a way to specify a jdk for a single invocation of maven?

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  • Perf4j Not Logging to Separate File

    - by Jehud
    I setup some stop watch calls in my code to measure some code blocks and all the messages are going into my primary log and not into the timing log. The perfStats.log file gets created just fine but all the messages go to the root log which I didn't think was supposed to happen according to the docs I've read. Is there something obvious I'm missing here? Example log4j.xml <!-- This file appender is used to output aggregated performance statistics --> <appender name="fileAppender" class="org.apache.log4j.FileAppender"> <param name="File" value="perfStats.log"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%m%n"/> </layout> </appender> <!-- Loggers --> <!-- The Perf4J logger. Note that org.perf4j.TimingLogger is the value of the org.perf4j.StopWatch.DEFAULT_LOGGER_NAME constant. Also, note that additivity is set to false, which is usually what is desired - this means that timing statements will only be sent to this logger and NOT to upstream loggers. --> <logger name="org.perf4j.TimingLogger" additivity="false"> <level value="INFO"/> <appender-ref ref="CoalescingStatistics"/> </logger> <root> <priority value="info"/> <appender-ref ref="STDOUT-DEBUG"/> </root>

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  • Javamail performance

    - by cbz
    Hi, I've been using javamail to retrieve mails from IMAP server (currently GMail). Javamail retrieves list of messages (only ids) in a particular folder from server very fast, but when I actually fetch message (only envelop not even contents) it takes around 1 to 2 seconds for each message. What are the techniques should be used for fast retrieval?

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  • Working with Jasper Reporsts

    - by Chandu
    Hi all, can I integrate the jasper report viewer to my swing application as like if I click on view report button from my application then viewer should be opened. If so could you advice me with code snippet for this integration and in this viewer the save as type should be restricted for PDF only rather than every other download option filter available . Please advice me in this regard. Regards, Chandu

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  • Override the Local module directory for cvs using Hudson

    - by Roberto
    Hi guys, I'm using Hudson and I need to change the checkout directory for cvs. Instead of checkout/update the project under the workspace dir, I'd like to specify a dir (as you can do for svn, changing the Local module directory conf) that will match the cvs tree structure. Eg. under cvs dir1/dir2/project on my box workspace/dir1/dir2/project is that possible with cvs and Hudson? Maybe there's a way to override the cvs call? Thanks! Roberto

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  • Using a checkbox input on a form to send the form data to different email addresses

    - by Cody Thomas
    I am building a form for a client. Here is the rundown. The form will be used as a request to have a staff member contact the person filling out the form. However, there is a list of staff members that will contact them depending on what the subject matter is. So, I want to create a checkbox input section on the form with each staff person's email address attached to a corresponding checkbox. So, the person filling out the form can check only the staff people necessary for their needs. Finally, when the person clicks "submit", the form will be emailed to only the staff members who were checked in the form. I'm at a loss of how to set this up.

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  • How to save file using JFileChooser??

    - by Lokesh Kumar
    Hi, I have a method in my application called "Save as" which Saves the image of my application on computer my into a file. I used the JFileChooser to let the users choose their desired location for saving the file. The problem is unless user explicitly types in the file format, it saves the file with no extension. How can I have formats like jpg, png in the File Type drop down menu. and, how can i get extension from the File Type drop menu for saving my image file. ImageIO.write(image,extension,file);

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  • scjp certification future validity

    - by abson
    Is this the right time to go for a scjp certification?With Oracle being the authority won't SCJP lose its value as and when OCJP gets announced instead of the former? my worry is will one be able to go for the next level like SCWCD?

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  • Reference a Map by name within Velocity Template

    - by Wiretap
    Pretty sure there is an easy answer to this, but just can't find the right VTL syntax. In my context I'm passing a Map which contains other Maps. I'd like to reference these inner maps by name and assign them within my template. The inner maps are constructed by different parts of the app, and then added to the context by way of example public static void main( String[] args ) throws Exception { VelocityEngine ve = new VelocityEngine(); ve.init(); Template t = ve.getTemplate( "test.vm" ); VelocityContext context = new VelocityContext(); Map<String,Map<String,String>> messageData = new HashMap<String, Map<String,String>>(); Map<String,String> data_map = new HashMap<String,String>(); data_map.put("data_1","1234"); data_map.put("a_date", "31-Dec-2009"); messageData.put("inner_map", data_map); context.put("msgData", messageData); StringWriter writer = new StringWriter(); t.merge( context, writer ); System.out.println( writer.toString() ); } Template - test.vm #set ($in_map = $msgData.get($inner_map) ) data: $in_map.data_1 $in_map.a_date

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  • Handling hundreds of actions in Struts2

    - by Roberto
    Hi all, I've inherited a struts 1 web application where, in order to reduce the number of Action classes (I guess this is the reason), lots of actions are mapped inside a single Action class, like: public XXXAction() throws Exception{ actions = new Hashtable(); actions.put("/XXX/main/load", new Integer(0)); actions.put("/XXX/main/save", new Integer(1)); ...... } public ActionForward executeAction(ActionMapping mapping, ActionForm form, HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException { try { switch (((Integer) actions.get(action)).intValue()) { case 0: loadXXXMain(); break; case 1: ....... and so on (in some Action classes I have almost one hundred of these small actions). Now I'm looking at migrate to struts2 and I would like to have a cleaner and better solution to handle this, maybe without having a single Action class for each of these small classes. What do you suggest? I don't like this solution, but I don't like having hundreds of Action classes.... Thanks! Roberto

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  • Axis2 Class Generation

    - by Jack
    I have an instance of a derived class (called Child) that I would like to send between the client and server of my web service. However, the method that might be returning this instance, is marked as returning an instance of the parent class (called Parent). For example: public class Service{public Parent createInstanceOfParentOrChildObject();} While Child is not a parameter anywhere in the service nor is it ever specifically named as a return type (only Parent is ever named), it is nonetheless generated and returned inside certain methods (and then cast to Parent). I generated the wsdl file using Axis2 1.4.1 java2wsdl and specifying that it include this class (using the -xc parameter). I did not use Axis2 1.5.1 because it was not honoring the -xc parameter though it looks like that bug is supposedly fixed in Axis2 1.6. I even did a quick check of the generated .wsdl file to ensure that it did indeed include a definition for Child (and, of course, Parent). However, when I used wsdl2java to generate the server-side (and client-side) code, Child was not generated. How can I get wsdl2java to generate Child? I realize that I could do this by hand but I don't want to have to do this for both the client and server. I was also hoping that I could make this as easy as possible for people to use my wsdl to generate their own clients.

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  • MyEclipse builds workspace on saving JSP page every time

    - by Tahir Akram
    Whenever I save a jsp page, MyEclipse IDE start building the workspace. It should build when I change in any class file. Or if there are classes that not compiled. But why it start building whole workspace when I change in a JSP file. I am stuck on it. Please advise me on this problem. I am using MyEclipse 5.5 over Eclipse 3.2 Thanks.

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