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  • How can I easily run different configurations in Eclipse?

    - by Roman
    I have an Java applications which I would like to run with different values of input parameters (specified in the command line). In "Run - Run Configurations" I have created different configurations corresponding to different values of the input arguments. I can run these configurations in the same way (throw "Run - Run Configurations"). But in these case I have to perform to many actions (clicks) to run a particular configuration. Is there a easier (faster) way to do that? For example I expect that I can do it throw "Run - Run as" but in the drop-dawn menu of the "Run as" I see "(Not Applicable)".

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  • How to keep Hibernate mapping use under control as requirements grow

    - by David Plumpton
    I've worked on a number of Java web apps where persistence is via Hibernate, and we start off with some central class (e.g. an insurance application) without any time being spent considering how to break things up into manageable chunks. Over time as features are added we add more mappings (rates, clients, addresses, etc.) and then amount of time spent saving and loading an insurance object and everything it connects to grows. In particular you get close to a go-live date and performance testing with larger amounts of data in each table is starting to demonstrate that it's all too slow. Obviously there are a number of ways that we could attempt to partition things up, e.g. map only the client classes for the client CRUD screens, etc., which would have been better to get in place earlier rather than trying to work it in at the end of the dev cycle. I'm just wondering if there are recommendations about ways to handle/mitigate this.

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  • Too many open connections... Did I mess up something?

    - by Legend
    I am developing a plugin (for a Bittorrent client named Azureus programmed in Java) that lets me add peers into the current list from which it is downloading. Everything was working fine until yesterday when I started getting these weird errors: DEBUG::Thu Apr 15 10:45:40 CET 2010::org.gudy.azureus2.core3.peer.impl.control.PEPeerControlImpl::addPeer::795: Injected peer 90.35.126.126:33064 was not added - Too many connections DEBUG::Thu Apr 15 10:48:40 CET 2010::org.gudy.azureus2.core3.peer.impl.control.PEPeerControlImpl::addPeer::795: Injected peer 80.25.126.126:33064 was not added - Too many connections DEBUG::Thu Apr 15 10:52:40 CET 2010::org.gudy.azureus2.core3.peer.impl.control.PEPeerControlImpl::addPeer::795: Injected peer 90.35.126.126:33064 was not added - Too many connections I am thinking I messed up something with the TCP sockets. Does anyone know why this could be happening?

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  • Remote Development Workflow with Tomcat and Eclipse

    - by Smithers
    Currently, I have tomcat installed on the production server to serve my java webapps. I develop in eclipse at my personal workstation and then I use an ant script to build the project into a war file and deploy that on the server. This setup works well when I am on the same network as the server because deploying is almost instantaneous. However, now that I am working remotely uploading the war file to the server is slow and in most cases very redundant (there are about .5 GB of static media included in the war file). Is there a better way to update my webapp on tomcat from eclipse and if so what are the best options for implementing such a solution with minimal effort?

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  • How to check connection leak using regular expression ?

    - by gauravkarnatak
    I have to check connection leak in my application i.e. open connections which have not been closed. After searching, after I found out that a thousands times connections have been opened but I can't manually go to each and every code fragment and check for connection close thing. I think, it could be possible using a regular expression but the fact is, I am not that well versed with regex that I could write one. Please suggest a regular expression for checking in a no of java files that a opened connection has been closed or not. My code pattern is something like this. try { /* Some code goes here */ con = EJBUtil.getConnection(JNDI_NAME); /* Some code goes here */ } finally { /* Some code goes here */ DBUtil.close(con); or closeConnection.close(con); /* Some code goes here */ }

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  • Java2D: Fill a convex rounded polygon (QuadCurves)

    - by Martijn Courteaux
    Hi, If I have a QuadCurve like this (+ = node): + + \ ./ +--?? And I fill it in Java 2D the result is something like this: (x = colored) +xxxxxxxxx+ \xxxxxx./ +--?? But I want to color the other side: + + x\ ./x xxx +--??xx xxxxxxxxxxx This succeeds by drawing a rectangle around the curve in the color I want to color the other side and then fill the curve with the background color. But this isn't good enough to fill a convex rounded (based on QuadCurves) polygon. In case of some coordinates for the rectangles (as explained in the trick I used) overlap other pieces of the polygon. Here are two images (the green area is my polygon): So, the question is simple: "How can I color a shape build of curves?" But to the answer will not be simple I think... Any advice would be VERY VERY appreciated. Thanks in advance. Maybe I'm going to make a bounty for this question if I don't get an answer

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  • Can we create a class from a xml file ?

    - by panzerschreck
    Hello, Is it possible to create a class dynamically by reading an xml file ( in java preferably) ? if yes, please provide pointers on how to do it. In the process of development, we have come up with a class that has 5 attributes, all these attributes correspond to an entry in the xml file, now if the user adds/modifies the xml entry the object corresponding to it must change automatically, one approach would be generate the source code, before compile time.Is there any other way ? Is there any common pattern to model such changes in the system ? Thanks,

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  • URLClassLoader does not find folders in jar if not ending with '/'?

    - by IttayD
    A 3rd party library (jersey) is trying to find Java packages by ClassLoader#findResource passing in the package name as file name (replacing dots with slashes). What I see is that if I pass a package name as 'a.b.c' (converted to 'a/b/c') it is not found, but if I pass 'a.b.c.' it is found. This translated directly to URL#inputStream that uses ZipFile which doesn't find the entry a/b/c, but finds the entry a/b/c/ I'm trying to find if this is the intended behavior or is there something wrong with my packaging (maven) or the URLs passed to the classloader (which look like jar:file://C:/.../foo.jar!/)

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  • How to implement GCM in Google AppEngine?

    - by Broken System
    I'm a PHP Developer and Web Designer. In my work a partner asked me if I could set up a Google Cloud Messaging server. I read the documentation but couldn't find a clear tutorial to set up this server. I got no knowleadge about Java so it makes my job harder. I could "compile" a war file using ant as GCM Demo Tutorial says. But I can't deploy it to my AppEngine server to try it out (It's my first time using AppEngine too). Could you give me some steps to create my own GCM server? Sorry about my bad english. Thanks!

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  • Tool used to retrieve code metrics in xUnit Test Patterns?

    - by leeand00
    I'm reading xUnit Test Patterns by Gerard Meszaros. On one of the pages he refers to some software metrics: While the need to wrap lines to keep them at 65 characters makes this code look even longer than it really is, it is still unnecessarily long. It contains 25 executable statements including initialized declarations, 6 lines of control statements, 4 in-line comments, and 2 lines to declare the test method—giving a total of 37 lines of unwrapped source code. Short of counting the statements to find these metrics, does anybody have any idea if he used a particular tool to calculate the metrics? (If you have any suggestions for tools that will count similar metrics, I'm looking for one that works on Java, Javascript and C++) Thanks!

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  • HTML tables in JTextPane showing weird "form" boxes

    - by Ted
    import java.awt.BorderLayout; import java.awt.EventQueue; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextPane; import javax.swing.border.EmptyBorder; import javax.swing.text.Document; import javax.swing.text.html.HTMLEditorKit; import javax.swing.text.html.StyleSheet; public class htmlEditor2 extends JFrame { private JPanel contentPane; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { htmlEditor2 frame = new htmlEditor2(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } public htmlEditor2() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); contentPane.setLayout(new BorderLayout(0, 0)); setContentPane(contentPane); Foo f = new Foo(); f.setText("<html><body><table border=\"1\" width=\"985\" cellpadding=\"3\" cellspacing=\"0\" style=\"table-layout: fixed; border-collapse: collapse; border-width: 0px; border-color: #010101; \"><colgroup><col width=\"328\"></col> <col width=\"328\"></col> <col width=\"328\"></col> </colgroup><tr><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><font face=\"Arial\"><span style=\"font-size:8pt\">row 1</span></font></div></td><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><font face=\"Arial\"><span style=\"font-size:8pt\">row2</span></font></div></td><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><font face=\"Arial\"><span style=\"font-size:8pt\">row3</span></font></div></td></tr><tr><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><span style=\"font-size: 8pt;\">&nbsp;</span></div></td><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><span style=\"font-size: 8pt;\">&nbsp;</span></div></td><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><span style=\"font-size: 8pt;\">&nbsp;</span></div></td></tr><tr><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><span style=\"font-size: 8pt;\">&nbsp;</span></div></td><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><span style=\"font-size: 8pt;\">&nbsp;</span></div></td><td align=\"left\" valign=\"top\" width=\"321\" style=\"border: solid #010101 1px; \"><div align=\"left\"><span style=\"font-size: 8pt;\">&nbsp;</span></div></td></tr></table><div align=\"left\">&nbsp;&nbsp;</div></body></html>"); contentPane.add(f); } class Foo extends JTextPane { public Foo() { super(); HTMLEditorKit kit = new HTMLEditorKit(); setEditorKit(kit); StyleSheet styleSheet = kit.getStyleSheet(); styleSheet.addRule(""); //in case I need to add a CSS Document doc = kit.createDefaultDocument(); setDocument(doc); } } } I would paste a nicely formatted version of the html, but I'm not sure how to do it on here... So yeah.. I just want to know how to get rid of those weird colgroup and col boxes in my table and how to make the table work normally! Thanks yall!

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  • Can SHA-1 algorithm be computed on a stream? With low memory footprint?

    - by raoulsson
    I am looking for a way to compute SHA-1 checksums of very large files without having to fully load them into memory at once. I don't know the details of the SHA-1 implementation and therefore would like to know if it is even possible to do that. If you know the SAX XML parser, then what I look for would be something similar: Computing the SHA-1 checksum by only always loading a small part into memory at a time. All the examples I found, at least in Java, always depend on fully loading the file/byte array/string into memory. If you even know implementations (any language), then please let me know!

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  • Is there a way to hide annotations in Netbeans or Eclipse?

    - by Boden
    Maybe a dumb question, but it would be nice if there was a way to hide or collapse Java annotations when viewing source in Netbeans (or Eclipse). I'm not finding an option and a quick search didn't turn anything up. Is this one of those "you should never want to do that, code folding is a sin!" things? Personally I'd find it useful for annotated entity classes. All the hibernate / etc annotations are just fluff that I never look at once my mapping is working fine. It's similar to imports, really. (Yes, I can use XML instead of annotations, which I might start doing. But I was just wondering...)

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  • Notifying JMS Message sender (Web App) after message processed by Listener

    - by blob
    I have a Web application (Flex 4 - Spring Blaze DS - Spring 3.0) which sends out an JMS event to a batch application (Standalone java) I am using JMS infrastrucure provided by Spring (spring JmsTemplate,SimpleMessageListenerContainer,MessageListenerAdapter) with TIBCO EMS. Is there any way by which we can notify a web user once message processing is completed by listener. One of the way to send a response event which will be listened by web application; but how to address following scenario: User1 click on submit - which in turn sends a JMS message Listener on receiving message processes the message (message processing may take 20-30 mins to complete). Listener application sends out another JMS event "Process_complete" As this is a web application; there are n users currently logged into the application. so how to identify a correct user / what if user is already logged off? Is there any way to handle this? Please post your views.

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  • Interview question: How do I detect a loop in this linked list?

    - by jjujuma
    Say you have a linked list structure in Java. It's made up of Nodes: class Node { Node next; // some user data } and each Node points to the next node, except for the last Node, which has null for next. Say there is a possibility that the list can contain a loop - i.e. the final Node, instead of having a null, has a reference to one of the nodes in the list which came before it. What's the best way of writing boolean hasLoop(Node first) which would return true if the given Node is the first of a list with a loop, and false otherwise? How could you write so that it takes a constant amount of space and a reasonable amount of time? Here's a picture of what a list with a loop looks like: Node->Node->Node->Node->Node->Node--\ \ | ----------------

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  • Need help understanding the MVC design pattern

    - by Doron Sinai
    Hi, I am trying to find a ood example of MVC design pattern in java. This is what i understood from reading about it, please correct me if I am wrong: I have the Model part which is the logic behind the program, let's say if we have a phonebook, so adding and removing contact from the Array will be the model. The Gui is the view and it contains buttons that upon clicking them, the model is changing. What I am trying to undersand what is the controller part, is it the ActionListeners? how to you seperate those modules in practice. thank you

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  • How to use atmosphere pubsub.

    - by Alfred
    First of I have maven installed. I have to admit I am not really familiar with Maven. but I can't get pubsub.war + atmosphere running. Could please someone please explain me. What I have tried Download atmosphere-spade-server + pubsub.war from there site. java -jar atmosphere-spade-server-0.6.0-20100329.142039-1.jar -a atmosphere-pubsub.war curl http://localhost:8080/atmosphere-pubsub/myAtmosphereTopic <html><body><h1>Resource Not> Found</h1></body></html> I would just have a guided tour of how to use atmosphere

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  • JBOSS V/s appache tomcat

    - by DEE
    Hi There, i am new to "java world" , i need following clarification when to use JBOSS v/s TOMCAT ? differences? which is more reliable ? which is more scalable? which is more easy to to administrate? does both have scale out options? can i host an application developed in flex on JBOSS/TOMCAT? my application would be simple 3-tier with Servlets , so given this which is the best option. any comments/suggestions Thanks in advance DEE

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  • What are the pro and cons of having localization files vs hard coded variables in source code?

    - by corgrath
    Definitions: Files: Having the localization phrases stored in a physical file that gets read at application start-up and the phrases are stored in the memory to be accessed via util-methods. The phrases are stored in key-value format. One file per language. Variables: The localization texts are stored as hard code variables in the application's source code. The variables are complex data types and depending on the current language, the appropriate phrase is returned. Background: The application is a Java Servlet and the developers use Eclipse as their primary IDE. Some brief pro and cons: Since Eclipse is use, tracking and finding unused localizations are easier when they are saved as variables, compared to having them in a file. However the application's source code becomes bigger and bloated. What are the pro and cons of having localization text in files versus hard coded varibles in source code? What do you do and why?

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  • Catching errors in ANTLR and finding parent

    - by Andreas
    I have found out that I can catch errors during parsing by overwriting displayRecognitionError, but how do I find the parent "node" of this error? ex. if I have the grammar: prog: stat expr; stat: STRING; expr: INTEGER; And give it the input "abc def". Then I will get an error at "def" which should be an integer. At this point I then want to get the parent which is "expr" (since it fails inside the INTEGER part) and it's parent "prog". Kind of like printing stack trace in java. I tried to look at the node from RecognitionException parsed to displayRecognitionError, but it is null, and using CommonErrorNode the parent is null. Should I maybe take a completely different approach?

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  • Ant failed to build

    - by eyal
    Hi, I have build a Java appliction which is using ant.jar (ant 1.8.2) classes for building android application from it's build.xml file with release as target. My Android project has been built by using android create project command, using sdk 2.2. When I run my application for building the Android application I get the following message - build.xml:46: taskdef class com.android.ant.SetupTask cannot be found I have verified the sdk.dir path and the sdk-location path and both are correct. How it can be solved? Thanks, Eyal.

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  • How to remove the title bar from a JFrame screenshot?

    - by Greg Harman
    I'm capturing a screenshot image of a JFrame via a "double buffering" approach, per below: public BufferedImage getScreenshot() { java.awt.Dimension dim = this.getPreferredSize(); BufferedImage image = new BufferedImage(dim.width, dim.height, BufferedImage.TYPE_INT_RGB); this.paint(image.getGraphics()); return image; } where this extends JFrame. The image that I get has a blank strip along the top where the title bar was. What's the most straightforward way to capture an image of the contents of the JFrame without the extra space allocated for the title bar?

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  • SmartGWT Server File Browser

    - by jluzwick
    Hi All: I have been looking for a SmartGWT example that would show me how to build a File Browser widget that takes the files from the local server's root directory. The user would be shown the files through the browser which they could then select to perform some processing operations. So far I have thought of using SmartGWT's Tree-Data Binding-Load from Local Data Widget and then grabbing a list of the directories using: new File("\").listFiles(); My Question is: Is there a better way to do this? Has someone already thought of this and has an example of their code that I can see? PS: I'm fairly new to GWT and Web Services but fairly competent with Java. If you believe there is a better way to do this (while still doing this through the web and not using Applets, please tell me). Thanks

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  • The emulator isn't showing the XML contents

    - by Roni Copul
    I have been reading Google's android tutorial (link added in the first comment) and I got a problem... In the tutorial they explain the XML elements (EditText and Button) and in the end they say how to tun the program to see the button + the text field. The problem is, that the emulator doesn't show them.. just a black screen. I even tried adding this line to the onCreate function - System.out.println("Hello World!"); but still the emulator is showing only black screen.. Here's the .java main file - http://pastebin.com/G5J9YjNe And the XML files (I mentioned what code is what file) - http://pastebin.com/VnRwAfMW What should I do? Thanks a lot for everyone who will help!

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  • Installing Hudson remotely?

    - by Dissonant
    I'm trying to install Hudson on a server. The article here says to just do java -jar hudson.war and it should install to the server. This is pretty straightforward to do on a local computer, but I want to do it on a remote website host that I manage via cPanel. So how on earth do I do this? I really am a newb when it comes to this sort of thing... Also, obviously I require the JRE to do this. How do you install the JRE on a remote website host via cPanel? I don't even know where to get started... Thanks.

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