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  • Tricky compiler behavior

    - by Neeraj
    Simple java code snippet. It has three classes. After compiling the code please delete A.class and then execute the code. Code still runs, why its not checking whether the byte code of A exists or not? class A { static { System.out.println("In the class A"); } public A() { } } class B { private A a = null; static { System.out.println("In the class B"); } public B() { a = new A(); } } public class ExampleLinkage { static { System.out.println("In the class A"); } public ExampleLinkage(String str) { } public static void main(String args[]) { try { System.out.println("In the main method of ExampleLinkage"); Class.forName("com.bt.rtti.B"); } catch(Exception e) { e.printStackTrace(); } } }

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  • JRuby Slick CanvasGameContainer using too much heap memory

    - by Jwosty
    I'm using Java's Slick library (great, by the way) just fine from JRuby. To start a game, I use AppGameContainer which works completely fine and as expected, but if I try to use CanvasGameContainer instead (I want a resizable window and Slick uses an old version of LWJGL that doesn't support this directly) it throws this error: Fri Jun 01 10:22:07 MDT 2012 INFO:Slick Build #274 Error: Your application used more stack memory than the safety cap of 2048K. Specify -J-Xss####k to increase it (#### = cap size in KB). Specify -w for full StackOverflowError stack trace I've tried increasing the heap size until my computer can't allocate any more memory, but to no avail. The CanvasGameContainer uses an awt window to display, which is resizable. Any ideas on why this is happening and/or how to fix this?

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  • Sort ArrayList of custom Objects by property

    - by Samuel
    Hello World!! :D I had a question which is pretty easy if you know the answer I guess. I read about sorting ArrayLists using a Comparator but somehow in all of the examples people used compareTo which according to some research is a method working on Strings... I wanted to sort an ArrayList of custom objects by one of their properties: a Date object (getStartDay()). Normally I compare them by item1.getStartDate().before(item2.getStartDate()) so I was wondering whether I could write something like: public class customComparator { public boolean compare(Object object1, Object object2) { return object1.getStartDate().before(object2.getStartDate()); } } public class randomName { ... Collections.sort(Database.arrayList, new customComparator); ... } I just started with Java so please forgive my ignorance :) Thanks in advance!! -Samuel

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  • Weird Mono compilation error

    - by nubela
    Hi, I am using IKVM to get SVNKit on a Mono project I'm working with, I have a class that implements an interface from SVNKit, and I can't compile: On windows and on .NET, everything compiles fine, just getting this on Mono. /home/nubela/Workspace/subsync/subsync/Core/Subversion/PropGetHandler.cs(22,22): Error CS0535: Subsync.Core.Subversion.PropGetHandler' does not implement interface member org.tmatesoft.svn.core.wc.ISVNPropertyHandler.__()' (CS0535) (subsync) I googled _() method, and it seems to be the initializer method for the base class in the Java library compiled from IKVM. I have no clue how to proceed now, any idea guys? :)

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  • Jython project in Eclipse can't find the Jython library, but works in an identical project

    - by Rob Lourens
    I have two projects in Eclipse with Java and Python code, using Jython. Also I'm using PyDev. One project can import and use the xml module just fine, and the other gives the error ImportError: No module named xml. As far as I can tell, all the project properties are set identically. The working project was created from scratch and the other comes from code checked out of an svn repository and put into a new project. What could be the difference?

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  • Criteria to Evaluate Business Rules Engines

    - by flybywire
    We are shopping for Business Rules Engines. We want to make our core application customizable to different customers with slightly different requirements. The people who would actually do the customizations are analysts. I.e. non-programmers who are technically skilled (usually have a degree in sciences). What are the criteria to evaluate business rules engines? Are there open source and comercial ones? What are your experiences in ease of use, documentation, support, price, etc. Our app is in Java.

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  • J2SE Proxy Authentication

    - by Alan
    We use 2 SIMILAR Microsoft ISA Proxy Server 2003 to connect to internet. Each Proxy has different Login style, as below : Server-1 : nt-domain\alan Server-2 : [email protected] Logon in IE, Firefox and my Phonecell via Wifi all are fine. But, a problem appears when we run a java application J2SE Ver 4, 5 and 6, where it needs internet authentication. Logon to Server-2 is OK, but FAIL for Server-2 (style : [email protected]). Note : Both proxy seen using Windows authentication, type : negotiate NTLM Appreceate if you can help or for any suggest. Thank you, Alan L

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  • How to retrieve .properties?

    - by user1014523
    Im developing desktop java application using maven. I got a *.properties file that I need to retrive during execution (src/resources/application.properties). The only thing comes to my mind is to use: private Properties applicationProperties; applicationProperties.load(new BufferedInputStream(new FileInputStream("src/resources/application.properties"))); This would work if I run my application directly from IDE. I want to to keep outpout hierarchy clear, so I set maven to copy resources folder dircetly to target folder (which is a basedir for the output application). This way application.properties file won't load (since I have target/resources/application.properties but not target/src/resources/application.properties). What is the best way to manage resources so they work both when I debug from IDE and run builded jar file directly?

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  • Unit testing several implementation of the same trait/interface

    - by paradigmatic
    I program mostly in scala and java, using scalatest in scala and junit for unit testing. I would like to apply the very same tests to several implementations of the same interface/trait. The idea is to verify that the interface contract is enforced and to check Liskov substitution principle. For instance, when testing implementations of lists, tests could include: An instance should be empty, if and only if and only if it has zero size. After calling clear, the size sould be zero. Adding an element in the middle of a list, will increment by one the index of rhs elements. etc. What are the best practices ?

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  • How to avoid null pointer error

    - by Jessy
    I trying to find whether the elements of 2 arrayLists are match or not. But this code give me error Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException since some of the elements are null. How can I solved this problem? String level []={"High","High","High","High","High","High"}; ArrayList<Object> n = new ArrayList<Object>(Arrays.asList(level)); String choice []={null,"High","Low","High",null,"Medium"}; ArrayList<Object> m = new ArrayList<Object>(Arrays.asList(choice)); //Check if the two arrayList are identical for(int i=0; i<m.size(); i++){ if(!(m.get(i).equals(n.get(i)))){ result= true; break; } } return result; }

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  • How does MTOM work + sample code

    - by zengr
    I am trying to make a very simple web-service which does the following: The client hits the web service requesting a file. The web service's service class queries a hashtable which has the key (search query) and the value as the base64encoded value of a file (say a pdf) Now,I need to use MTOM to return the base64encoded value stored in the hashtable to the client. It's upto the client to decode it and convert it to pdf. So, here are my questions: I understand we encode files to base64 for transmission via web service, but where and how does MTOM come into the picture there? Can some one provide me a simple method which uses MTOM and sends the data back. Do we need to specify something in the WSDL too? or a simple String return type would suffice? Why/Why not? Thanks I have seen this code. It uses a lot of annotations, I just need a simple java code using MTOM. New to J2EE HERE :)

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  • Database independent row level security solution

    - by Filip
    Hi, does anybody knows about Java/C# database independent authorization library. This library should support read, write, delete, insert actions across company organizational structure. Something like this: - user can see all documents - user can enter new document assigned to his unit - user can change all documents assigned to his unit and all subordinate units. - user can delete documents that are assigned to him I should also be able to create custom actions (besides read, write,...) connect them to certain class and assign that "security token" to user (e.g. document.expire). If there aren't any either free or commercial libraries, is there a book that could be useful in implementing this functionality? Thanks.

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  • Viewing HTML inside Applet without using JEditorPane

    - by Tom
    Hello, I have a small (500kb) swing applet that displays very simple/limited set of small HTML page(s) inside it with JEditorPane, however this does not seem to work 100% fluently, some customers get a blank page displayed without any java exceptions. The page works OK from my machine. I need a more reliable way to show HTML page to all our users. Any ideas if there is a small + free class to use instead of JEditorPane OR is there an easy fix to make it more reliable (non blank) private JEditorPane m_editorPane = new JTextPane(); m_editorPane.setEditable( false); m_editorPane.setBackground(new Color(239 ,255, 215)); m_editorPane.setBounds(30,42,520,478 ); m_editorPane.setDoubleBuffered(true); m_editorPane.setBorder(null); m_editorPane.registerEditorKitForContentType("text/html", "com.xxxxx.SynchronousHTMLEditorKit"); m_editorPane.setPage(ResourceLoader.getURLforDataFile(param.trim()));

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  • Automation of testing using JUnit

    - by Vijay Selvaraj
    Hi, i am trying to automate manual testing of modules in my project. We are dealing with IBM Websphere Message queue software. We have a trigger component written in core java which when executed polls for availability of message in the configured queue. Its an indefinite while loop that keeps the trigger component running. I have written test cases in JUnit to put message in the queue and now will i be able to start/stop the trigger component on demand? Invoking the trigger component keeps it running and i am not getting the control back to check the expected output. If i start it in thread then the log files to which the trigger component is supposed to update when processing the message is not getting updated. How can i resolve this situation. Your suggestion and directions is highly appreciated. Thanks, -Vijay

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  • How long should it take for someone to be able to type code from memory?

    - by LordSnoutimus
    Hi, I understand that this question could be answered with a simple sentence and that it may be viewed as subjective, however, I am a young student who is interested in pursuing a career in programming and wondered how long it took some of you to get to the level of experience you are now?. I ask this because I am currently working on building an application in Java on the Android platform and it bothers me that I am constantly having to look up how to write a certain section of code in my application such as writing to a database, or how the if loop should be structured. My question really is, how long did it take for you to become experienced enough to actually know exactly how your next line of code was going to look, before you even wrote it?

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  • Looking for an HQL builder (Hibernate Query Language)

    - by Sébastien RoccaSerra
    I'm looking for a builder for HQL in Java. I want to get rid of things like: StringBuilder builder = new StringBuilder() .append("select stock from ") .append( Stock.class.getName() ) .append( " as stock where stock.id = ") .append( id ); I'd rather have something like: HqlBuilder builder = new HqlBuilder() .select( "stock" ) .from( Stock.class.getName() ).as( "stock" ) .where( "stock.id" ).equals( id ); I googled a bit, and I couldn't find one. I wrote a quick & dumb HqlBuilder that suits my needs for now, but I'd love to find one that has more users and tests than me alone. Note: I'd like to be able to do things like this and more, which I failed to do with the Criteria API: select stock from com.something.Stock as stock, com.something.Bonus as bonus where stock.someValue = bonus.id ie. select all stocks whose property someValue points to any bonus from the Bonus table. Thanks!

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  • Can I pass data into a HashMap<String,Object> from JSP to a JavaBean?

    - by Parris
    Hi Everyone, I am just starting out with JSP, Java, etc web development... I would love to use some sort of framework, but for this project I can't do that. In any case I want to potentially pass essentially limitless data (for flexibility) to my javabeans. My idea was if I can have key value pairs that would really easy. The values will always be strings or integers. HashMap seems ideal in this case. Is this possible? Any ideas? Can I do this with JSP Bean tags or should I write scriptlets? Thanks!!!

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  • Building big, immutable objects without using constructors having long parameter lists

    - by Malax
    Hi StackOverflow! I have some big (more than 3 fields) Objects which can and should be immutable. Every time I run into that case i tend to create constructor abominations with long parameter lists. It doesn't feel right, is hard to use and readability suffers. It is even worse if the fields are some sort of collection type like lists. A simple addSibling(S s) would ease the object creation so much but renders the object mutable. What do you guys use in such cases? I'm on Scala and Java, but i think the problem is language agnostic as long as the language is object oriented. Solutions I can think of: "Constructor abominations with long parameter lists" The Builder Pattern Thanks for your input!

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  • Get Time in London

    - by fahdshariff
    How can I get the current local wall clock time (in number of millis since 1 Jan 1970) in London? Since my application can run on a server in any location, I think I need to use a TimeZone of "Europe/London". I also need to take Daylight Savings into account i.e. the application should add an hour during the "summer". I would prefer to use the standard java.util libraries. Is this correct? TimeZone tz = TimeZone.getTimeZone("Europe/London") ; Calendar cal = Calendar.getInstance(tz); return cal.getTime().getTime() + tz.getDSTSavings(); Thanks

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  • Hibernate vs JPA vs JDO - pros and cons of each?

    - by matt b
    I'm familiar with ORM as a concept, and I've even used nHibernate several years ago for a .NET project; however, I haven't kept up with the topic of ORM in Java and haven't had a chance to use any of these tools. But, now I may have the chance to begin to use some ORM tools for one of our applications, in an attempt to move away from a series of legacy web services. I'm having a hard time telling the difference betweeen the JPA spec, what you get with the Hibernate library itself, and what JDO has to offer. So, I understand that this question is a bit open-ended, but I was hoping to get some opinions on: What are the pros and cons of each? Which would you suggest for a new project? Are there certain conditions when it would make sense to use one framework vs the other?

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  • Strange HtmlUnit behavior (bug?)

    - by roddik
    Hello. Take a look at this: WebClient client = new WebClient(); WebRequestSettings wrs = new WebRequestSettings(new URL("http://stackoverflow.com/ping/?what-the-duck?"), HttpMethod.HEAD); client.getPage(wrs); Running this code results in throwing FileNotFoundException, because HTTP Status code on the page is 404 and getting the same page again with the GET method, with User-Agent set to Java-.... Why does it GET the page (it doesn't happen with "normal" status codes)? Is this a bug? Thanks Here is the entire server response: HTTP/1.1 404 Not Found Cache-Control: private Content-Length: 7502 Content-Type: text/html; charset=utf-8 Server: Microsoft-IIS/7.5 Date: Thu, 11 Feb 2010 14:12:11 GMT Where does it tell client to GET something? And how can I force WebClient to ignore it? Here's a screenshot of HTTPDebugger: The problem here is I don't understand why the second request is being sent and why is it sent with different useragent.

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  • how to programming SYSTEM for reading_comperhension question in English.

    - by michael123
    hi , i have to do some study for reading_comperhension in English. my work is ok but there is part from natural language - nlp area that i have to used . i want some help about QAsystem , how to answer the reading_comperhension automaticly .i have simple system about it that i get from this website http://www.cs.utah.edu/contest/2003/ , there is simple system in java but did not work to my i try to load the file from Remedia dataset that have the reading_comperhension story, but no result. after run this system , i have to develop by current technique such as rule based or pattern machine or combined with simple named entity.how to make that and which of them is petter to combined with the QAsys. thank you

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  • Should we seal Singletons? Should we try to inherit from Singletons in the first place?

    - by devoured elysium
    Should a Singleton class be allowed to have children? Should we seal it? What are the pro's and con's? For being able to inherit from a Singleton class, we would have to make the constructor protected instead of private. Now, that will be fine in c#, but the protected word in java gives both child-classes and package-classes access to the constructor. Which means not only classes that inherit from our Singleton can access the constructor but other classes in the same package can do it. I'm a bit confused about all this facts. Maybe I am making a big fuss about nothing to worry about too much? Until now, I never had any necessity of trying to inherit from a Singleton, so maybe this is just an academic question! Thanks

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  • Rhino: How to get all properties from ScriptableObject?

    - by Dyatlov Vitaly
    Hi guys. I am using a Javascript object as an object with configuration properties. E.g. I have this object in javascript: var myProps = {prop1: 'prop1', prop2: 'prop2', 'prop3': 'prop3'}; This object (NativeObject) is returned to me in Java function. E.g. public Static void jsStaticFunction_test(NativeObject obj) { //work with object here } I want to get all properties from object and build HashMap from it. Any help will be appreciated.

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  • Are government programming jobs good?

    - by Absolute0
    I am a passionate software developer and greatly enjoy programming. However I was recently contacted regarding a developer lead position for a government job at NYC for the fire department. The pay is pretty good, and I would assume the position has good job security and stability. But I am hesitant to even go for an interview as it seems like an exaggerated version of Office Space with a lot of Bureaucracy and mindless paper work. The description is as follows: The Lead Applications Developer, supporting the Programming Group, will be responsible for all phases of the system development life cycle including performing system analysis, requirements definition, database design, preparation of scopes of work, and development of project plans. Supervise programming staff and manage projects involving the design, implementation, maintenance, and enhancement of complex Oracle based user applications using Oracle Development tools. Applications will be deployed using Oracle Application Server utilizing programming languages such as JAVA, JSF, JSP, Oracle ADF, PL/SQL, and XML with J2EE and EJB technology. Anyone with previous government experience can share their two cents on this? Thank you.

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