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  • Why would Java classloading fail on Linux, but succeed on Windows?

    - by arnsholt
    I've got a Java web application (using Spring), deployed with Jetty. If I try to run it on a Windows machine everything works as expected, but if I try to run the same code on my Linux machine, it fails like this: [normal startup output] 11:16:39.657 INFO [main] org.mortbay.jetty.servlet.ServletHandler$Context.log(ServletHandler.java:1145) 16 Set web app root system property: 'webapp.root' = [/path/to/working/dir] java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.mortbay.start.Main.invokeMain(Main.java:151) at org.mortbay.start.Main.start(Main.java:476) at org.mortbay.start.Main.main(Main.java:94) Caused by: java.lang.ExceptionInInitializerError at org.springframework.web.util.Log4jWebConfigurer.initLogging(Log4jWebConfigurer.java:129) at org.springframework.web.util.Log4jConfigListener.contextInitialized(Log4jConfigListener.java:51) at org.mortbay.jetty.servlet.WebApplicationContext.doStart(WebApplicationContext.java:495) at org.mortbay.util.Container.start(Container.java:72) at org.mortbay.http.HttpServer.doStart(HttpServer.java:708) at org.mortbay.util.Container.start(Container.java:72) at org.mortbay.jetty.Server.main(Server.java:460) ... 7 more Caused by: org.apache.commons.logging.LogConfigurationException: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@15311bd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category) (Caused by org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@15311bd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category)) at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:543) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:235) at org.apache.commons.logging.impl.LogFactoryImpl.getInstance(LogFactoryImpl.java:209) at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:351) at org.springframework.util.SystemPropertyUtils.(SystemPropertyUtils.java:42) ... 14 more Caused by: org.apache.commons.logging.LogConfigurationException: No suitable Log constructor [Ljava.lang.Class;@15311bd for org.apache.commons.logging.impl.Log4JLogger (Caused by java.lang.NoClassDefFoundError: org/apache/log4j/Category) at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:413) at org.apache.commons.logging.impl.LogFactoryImpl.newInstance(LogFactoryImpl.java:529) ... 18 more Caused by: java.lang.NoClassDefFoundError: org/apache/log4j/Category at java.lang.Class.getDeclaredConstructors0(Native Method) at java.lang.Class.privateGetDeclaredConstructors(Class.java:2389) at java.lang.Class.getConstructor0(Class.java:2699) at java.lang.Class.getConstructor(Class.java:1657) at org.apache.commons.logging.impl.LogFactoryImpl.getLogConstructor(LogFactoryImpl.java:410) ... 19 more Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Category at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) ... 24 more [shutdown output] I've run the app with java -verbose:class, and according to that output, org.apache.log4j.Category is loaded from the log4j JAR in my /WEB-INF/lib, just before the first exception is thrown. Now, the Java versions on the two machines are slightly different. Both the machines have Sun's java, the Linux machine has 1.6.0_10, while the Windows machine has 1.6.0_08, or maybe 07 or 06, I can't remember the exact number right now, and don't have the machine at hand. But even though the minor versions of the Javas are slightly different, the code shouldn't break like this. Does anyone understand what's wrong here?

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  • Why not .NET-style delegates rather than closures in Java?

    - by h2g2java
    OK, this is going to be my beating a dying horse for the 3rd time. However, this question is different from my earlier two about closures/delegates, which asks about plans for delegates and what are the projected specs and implementation for closures. This question is about - why is the Java community struggling to define 3 different types of closures when we could simply steal the whole concept of delegates lock, stock and barrel from our beloved and friendly neighbour - Microsoft. There are two non-technical conclusions I would be very tempted to jump into: The Java community should hold up its pride, at the cost of needing to go thro convoluted efforts, by not succumbing to borrowing any Microsoft concepts or otherwise vindicate Microsoft's brilliance. Delegates is a Microsoft patented technology. Alright, besides the above two possibilities, Q1. Is there any weakness or inadequacy in msft-styled delegates that the three (or more) forms of closures would be addressing? Q2. I am asking this while shifting between java and c# and it intrigues me that c# delegates does exactly what I needed. Are there features that would be implemented in closures that are not currently available in C# delegates? If so what are they because I cannot see what I need more than what C# delegates has adequately provided me? Q3. I know that one of the concerns about implementing closures/delegates in java is the reduction of orthogonality of the language, where more than one way is exposed to perform a particular task. Is it worth the level convolution and time spent to avoid delegates just to ensure java retains its level of orthogonality? In SQL, we know that it is advisable to break orthogonality by frequently adequately satisfying only the 2nd normal form. Why can't java be subjected to reduction of orthogonality and OO-ness for the sake of simplicity? Q4. The architecture of JVM is technically constrained from implementing .NET-styled delegates. If this reason WERE (subjunctive to emphasize unlikelihood) true, then why can't the three closures proposals be hidden behind a simple delegate keyword or annotation: if we don't like to use @delegate, we could use @method. I cannot see how delegate statement format is more complex than the three closure proposals.

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  • ssl multi domain website

    - by NetParis
    We need to secure a multi-langual web application with SSL (registration, login,..). However, this application is accessed by different domain names, exactly a domain name for each language (domainName.co.uk, domainName.fr, domainName.it and so on). We're looking for the simplest and cheapest solution. We don't want to purchase a certificate for each domain name. Some one has an idea ? the web server : IIS 6 Thanks

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  • UILabel: adjusting margins to match a UITextView

    - by Aran Mulholland
    I have a UILabel and if i adjust the size of the text i can make it look loke a UITextView however the left margin is different, on the UIlabel the text is right up against the left border where the UITextView has a slight margin. How do i adjust the UILabel so that when these controls are placed above one another, they look consistent?

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  • Office 2007 and Office 2010 installed side by side

    - by BlueDevil
    I have Office 2007 and Office 2010 installed side-by-side. How do I stop the setup / configuration window from appearing each time I open a different version? If I open 2007, it will go through the configuration process, then I can use 2007 without issue until I open a 2010 application. Then, when I open any 2010 Office application it will go through the configuration process.

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  • ColumnChart google visualization column color change

    - by drozzy
    Does anyone know if I can hack google's visualization ColumnChart api chart somehow, to make a single column stand out with a different color, like so: I know you can do it with ImageChart, so I don't need that (it fires no events and has no x/y labels). Can I traverse the result with javascript somehow and change the CSS style, if it is truly rendered in SVG?

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  • Parsing an MS Project 2007 xml project file.

    - by fred-22
    Has anyone got any idea how to read the XML file saved by MS Project 2007? The standard binary format is .MPP but I'd like to view a project in a different viewer. I've saved the project spec as XML and the viewer I'm using needs the parent task Id for each task. Where can i find that in the rather huge amount of XML data created by ms project?

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  • Why did Dylan lose to Objective-C

    - by Adam Gent
    I have played/worked with many different programming languages and Dylan is still one of my favorites. My question is why did Dylan fail when Objective-C, Ruby and even Scheme have had more success? Was Dylans performance that much worse than Objective-C that Apple went with it or was purely for social/political reasons. Hopefully someone from apple will see this question :) BTW if you have no idea what Dylan is please google Dylan Progrmaming Language.

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  • UiBinder Dynamic DockPanel

    - by murray
    Simple Question .... If I have a StackLayoutPanel on the left, I want to click it have a dynamically loaded widget in my DockLayoutPanel on right ... similar to the GWt example http://gwt.google.com/samples/Mail/Mail.html.. where clicking anything under mailboxes would trigger a different widget on right...

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  • How does Nike's website do this Flash effect when the user selects a choice.

    - by Luis Armando
    I was wondering how does Nike website make the change you can see when selecting a color or a sole. At first I thought they were only using images and when the user picked a color you just replaced that part, but when I selected a different sole I noticed it didn't changed like an image it looked a bit more as if it was being rendered. Does anybody happens to know how this is made? Or where can I get further info about making this effect :)?

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  • regex to parse a iCalendar file in ActionScript

    - by Mac Fly
    Hello, I use a library to parse an iCalendar file, but I don't understand the regex to split property. iCalendar property has 3 different style: BEGIN:VEVENT DTSTART;VALUE=DATE:20080402 RRULE:FREQ=YEARLY;WKST=MO The library uses this regex that I would like to understand: var matches:Array = data.match(/(.+?)(;(.*?)=(.*?)((,(.*?)=(.*?))*?))?:(.*)$/); p.name = matches[1]; p.value = matches[9]; p.paramString = matches[2]; Thanks.

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  • How to count differences between two files on linux?

    - by Zsolt Botykai
    Hi all, I need to work with large files and must find differences between two. And I don't need the different bits, but the number of differences. For the differ rows I come up with diff --suppress-common-lines --speed-large-files -y File1 File2 | wc -l And it works, but is there a better way to do it? And how to count the exact number of differences (with standard tools like bash, diff, awk, sed some old version of perl)? Thanks in advance

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  • Synchronization requirements for FileStream.(Begin/End)(Read/Write)

    - by Doug McClean
    Is the following pattern of multi-threaded calls acceptable to a .Net FileStream? Several threads calling a method like this: ulong offset = whatever; // different for each thread byte[] buffer = new byte[8192]; object state = someState; // unique for each call, hence also for each thread lock(theFile) { theFile.Seek(whatever, SeekOrigin.Begin); IAsyncResult result = theFile.BeginRead(buffer, 0, 8192, AcceptResults, state); } if(result.CompletedSynchronously) { // is it required for us to call AcceptResults ourselves in this case? // or did BeginRead already call it for us, on this thread or another? } Where AcceptResults is: void AcceptResults(IAsyncResult result) { lock(theFile) { int bytesRead = theFile.EndRead(result); // if we guarantee that the offset of the original call was at least 8192 bytes from // the end of the file, and thus all 8192 bytes exist, can the FileStream read still // actually read fewer bytes than that? // either: if(bytesRead != 8192) { Panic("Page read borked"); } // or: // issue a new call to begin read, moving the offsets into the FileStream and // the buffer, and decreasing the requested size of the read to whatever remains of the buffer } } I'm confused because the documentation seems unclear to me. For example, the FileStream class says: Any public static members of this type are thread safe. Any instance members are not guaranteed to be thread safe. But the documentation for BeginRead seems to contemplate having multiple read requests in flight: Multiple simultaneous asynchronous requests render the request completion order uncertain. Are multiple reads permitted to be in flight or not? Writes? Is this the appropriate way to secure the location of the Position of the stream between the call to Seek and the call to BeginRead? Or does that lock need to be held all the way to EndRead, hence only one read or write in flight at a time? I understand that the callback will occur on a different thread, and my handling of state, buffer handle that in a way that would permit multiple in flight reads. Further, does anyone know where in the documentation to find the answers to these questions? Or an article written by someone in the know? I've been searching and can't find anything. Relevant documentation: FileStream class Seek method BeginRead method EndRead IAsyncResult interface

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  • Tactics for using PHP in a high-load site

    - by Ross
    Before you answer this I have never developed anything popular enough to attain high server loads. Treat me as (sigh) an alien that has just landed on the planet, albeit one that knows PHP and a few optimisation techniques. I'm developing a tool in PHP that could attain quite a lot of users, if it works out right. However while I'm fully capable of developing the program I'm pretty much clueless when it comes to making something that can deal with huge traffic. So here's a few questions on it (feel free to turn this question into a resource thread as well). Databases At the moment I plan to use the MySQLi features in PHP5. However how should I setup the databases in relation to users and content? Do I actually need multiple databases? At the moment everything's jumbled into one database - although I've been considering spreading user data to one, actual content to another and finally core site content (template masters etc.) to another. My reasoning behind this is that sending queries to different databases will ease up the load on them as one database = 3 load sources. Also would this still be effective if they were all on the same server? Caching I have a template system that is used to build the pages and swap out variables. Master templates are stored in the database and each time a template is called it's cached copy (a html document) is called. At the moment I have two types of variable in these templates - a static var and a dynamic var. Static vars are usually things like page names, the name of the site - things that don't change often; dynamic vars are things that change on each page load. My question on this: Say I have comments on different articles. Which is a better solution: store the simple comment template and render comments (from a DB call) each time the page is loaded or store a cached copy of the comments page as a html page - each time a comment is added/edited/deleted the page is recached. Finally Does anyone have any tips/pointers for running a high load site on PHP. I'm pretty sure it's a workable language to use - Facebook and Yahoo! give it great precedence - but are there any experiences I should watch out for? Thanks, Ross

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  • pdf viewer for pyqt4 application?

    - by japs
    Hi all, I'm writing a Python+Qt4 application that would ideally need to pop up a window every once in a while, to display pdf documents and allow very basic operations, namely scrolling through the different pages and printing the document. I've found the reportLab to create pdf files, but nothing about pdf viewers. Does anyone knows anything that might help. i was really hoping for the existence of something like the QWebView widget... thanks in advance to all

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  • Reuse an MVC area in multiple MVC applications?

    - by James Newton-King
    I have some common web pages that will be in multiple MVC applications. For those pages I'd like to reuse the same source code (controllers + views) between the different MVC web sites. What is the best way to go about doing this? ASP.NET MVC areas seem like one possibility but they just a sub directory of the website project. Is it possible to reuse an MVC area in multiple MVC applications?

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  • opengl paint program based on Apple's 'glPaint' on a white background - how to blend?

    - by Adam
    Trying to write a simple paint program for iPhone, and I'm using Apple's glPaint sample as a guide. The only problem is, painting doesn't work on a white background, since white + colour = white. I've tried different blending functions, but haven't been able to hit on the right combination of settings and/or brushes to make this work. I've seen similar posts about this problem but no answers. Does anyone know how this might work?

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  • Current Date in Silverlight XAML TextBlock

    - by user292110
    I am coming from Flex where you can do just about anything inside of curly braces. I am trying to get a TextBlock to display today's Date and Time without just coding it in C#. I have tried many different variations of the following with no luck. TextBlock Text="{Source=Date, Path=Now, StringFormat='dd/MM/yyyy'}" I know I could probably just set a property MyDate and bind to that but why can't I bind directly to the DateTime.Now property?

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  • jQuery find file extension (from string)

    - by SoulieBaby
    Hi all, I was wondering if it was possible for jQuery to find a file extension based on a returned string? A filename (string) will be passed to a function (openFile) and I wanted that function to do different things based on what file has been passed through, it could be image files or pdf files. function openFile(file) { //if .jpg/.gif/.png do something //if .zip/.rar do something else //if .pdf do something else }; I've been looking for something that will find the file's extension but I can't seem to find anything.

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  • Row Number for group by ?

    - by Damien Joe
    I have table structure like Category EmpName 1 Harry 1 John 1 Ford 2 James 2 Mark 2 Shane 3 Oliver 3 Ted I want results like Category EmpName RowNumber 1 Harry 1 1 John 2 1 Ford 3 2 James 1 2 Mark 2 2 Shane 3 3 Oliver 1 3 Ted 2 I am using db2 and row_number() is not working for different groups of records.

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