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  • POI performance

    - by The Machine
    I am using POI in my J2EE web application to generate a workbook. However, i find that POI takes around 3 mins to create a workbook with 25K rows(with around 15 columns each). Is this a POI performance issue , or is it justified to take that much of time? Are there other APIs known for better performance ?

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  • Jackson XML globally set element name for container types

    - by maxenglander
    I'm using Jackson 1.9.2 with the XML databind module. I need to tweak the way that Jackson serializes arrays, lists, collections. By default, with an int array property called myProperty containing a couple numbers, Jackson / XML is producing the following: <myProperty> <myProperty>1</myProperty> <myProperty>2</myProperty> </myProperty> What I need to produce is: <myProperty> <item>1</item> <item>2</item> </myProperty> I can do this on a per-POJO basis using a combination of JacksonXmlElementWrapper and JacksonXmlProperty like so: @JacksonXmlElementWrapper(localname='myProperty') @JacksonXmlProperty(localname='item') public int[] myProperty; This solution, however, would require that I manually apply these annotations to every array, list, collection in my POJOs. A much better solution would allow me to apply a solution once, globally, for all array, list, collection types. Any ideas on how to implement such a solution? Thanks!

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  • Struts or Spring MVC or Struts & Spring?

    - by Shaw
    I need some information to understand design decision: Is Struts a better choice than Spring MVC? I hear about Strus-Spring-Hibernae combo - Is struts used at MVC layer because its a matured framework than when compared to Spring MVC? Any one used this combination for projects or aware of issues?

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  • How to get contacts in order of their upcoming birthdays?

    - by Pentium10
    I have code to read contact details and to read birthdays. But how do I get a list of contacts in order of their upcoming birthday? For a single contact identified by id, I get details and birthday like this: Cursor c = null; try { Uri uri = ContentUris.withAppendedId( ContactsContract.Contacts.CONTENT_URI, id); c = ctx.getContentResolver().query(uri, null, null, null, null); if (c != null) { if (c.moveToFirst()) { DatabaseUtils.cursorRowToContentValues(c, data); } } c.close(); // read birthday c = ctx.getContentResolver() .query( Data.CONTENT_URI, new String[] { Event.DATA }, Data.CONTACT_ID + "=" + id + " AND " + Data.MIMETYPE + "= '" + Event.CONTENT_ITEM_TYPE + "' AND " + Event.TYPE + "=" + Event.TYPE_BIRTHDAY, null, Data.DISPLAY_NAME); if (c != null) { try { if (c.moveToFirst()) { this.setBirthday(c.getString(0)); } } finally { c.close(); } } return super.load(id); } catch (Exception e) { Log.v(TAG(), e.getMessage(), e); e.printStackTrace(); return false; } finally { if (c != null) c.close(); } and the code to read all contacts is: public Cursor getList() { // Get the base URI for the People table in the Contacts content // provider. Uri contacts = ContactsContract.Contacts.CONTENT_URI; // Make the query. ContentResolver cr = ctx.getContentResolver(); // Form an array specifying which columns to return. String[] projection = new String[] { ContactsContract.Contacts._ID, ContactsContract.Contacts.DISPLAY_NAME }; Cursor managedCursor = cr.query(contacts, projection, null, null, ContactsContract.Contacts.DISPLAY_NAME + " COLLATE LOCALIZED ASC"); return managedCursor; }

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  • Message Queue or Scheduler

    - by Walter White
    Hi all, I am currently using Quartz Scheduler for asynchronous tasks such as sending an email when an exception occurs, sending an email from the web interface, or periodically analyzing traffic. Should I use a message queue for sending an email? Is it any more efficient or correct to do it that way? The scheduler approach works just fine. If I use a queue and the email failed to send, is it possible for the queue to retry sending the email at a later time? The queue approach looks simpler than the scheduler for tasks that need to happen immediately, but for scheduler tasks, the scheduler still, unless there is more to the queue than I am aware of. I have not yet used JMS, so this is what I have read. Walter

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  • JEditorPane scrolling to the current caret position

    - by Elliott
    I have a JEditorPane which I use to display an HTML document. the document has hyperlinks embedded in it. When a user clicks on a bookmark a position the caret to the associated place in the JeditorPane. The JeditorPane is then suppose to scroll to this position. This works mostly. But, I noticed that if the document has a lot of "break tags" (BR) tags embedded in it, the scrolling does not position the JEditorPane to right place. It's like the tags throw the callebration off. Any suggestions on what to do about this?

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  • Eclipse Intro / Welcome page

    - by Raven
    Hello, is it possible to have links on the welcome page which point to defined commands and for example, launch an dialog? I am thinking of having a welcome page, pointing out the steps what to do first, like: 1) change language (click here) 2) set up database connection (click here) 3) start working (click here) "click here" should be a link to call the actual dialog to set things up. I am using Eclipse with the command style menu. Grateful for any suggestions!

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  • Update n number of records using JPA with Optimistic locking

    - by Jacques René Mesrine
    I have a table with a column called "count" and I want to run a cron job that will trigger a statement that performs a SQL like this: update summaryTable set count=4; Note that there might be concurrent threads reading & changing the value for "count" when this cron job is triggered. The table has a version column to support Optimistic Locking. What's an efficient way to update the count in JPA ?

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  • Why does Android's onItemClick want a long for row Id?

    - by HenryAdamsJr
    For a listView, when you register an OnItemClickListener, the method you specify looks like this: public abstract void onItemClick (AdapterView parent, View view, int position, long id) The id corresponds to the row that the user clicked on. My question is simply why is it a long and not an int? When would you use it as a long? I've been casting it to an int when I use it, so it makes me think that maybe I'm using it wrong.

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  • How To Run integrational Tests

    - by Vladimir
    In our project we have a plenty of Unit Tests. They help to keep project rather well-tested. Besides them we have a set of tests which are unit tests, but depends on some kind of external resource. We call them external tests. They can access web-service sometimes or similar. While unit tests is easy to run the integrational tests couldn't pass sometimes - for example due to timeout error. Also these tests can take too much time to run. Currently we keep integration/external unit tests just to run them when developing corresponding functionality. For plain unit tests we use TeamCIty for continuous integration. How do you run the integration unit tests and when do you run them?

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  • In wicket, combine wicket:link with IAuthorizationStrategy

    - by seanizer
    Hi everybody. I use an IAuthorizationStrategy in wicket to limit access to certain pages. However, I also use html menus like this one: <div class="siteMenu"> <wicket:link> <a href="Page1.html" class="siteMenuLink"> <wicket:message key="pages.page1.title" /> </a> <a href="Page2.html" class="siteMenuLink"> <wicket:message key="pages.page2.title" /> </a> <a href="Page3.html" class="siteMenuLink"> <wicket:message key="pages.page3.title" /> </a> </wicket:link> </div> , that are automatically picked up and expanded using the wicket:link mechanism (like here: http://wicket.apache.org/examplenavomatic.html ). However, the IAuthorizationStrategy may not allow one or more of these target pages, so I may end up either with lots of links that lead to "permission denied" pages or lots of deactivated links (i.e. em tags or the like), neither of which is pretty. I could of course write an IComponentInstantiationListener that checks all BookmarkableLinks to see whether their target is accessible through the IAuthorizationStrategy and renders them invisible otherwise, but I wonder if there is an out-of-the-box solution to this problem. For clarification: I only use the isInstantiationAuthorized() method of IAuthorizationStrategy.

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  • Is it possible to override the default logging for Glassfish v3?

    - by kgrad
    Related to this question. It appears that Glassfish is exporting slf4j into my application and overriding my logging solution. Is it possible for me to override Glassfish's logging and have my own logging solution take precedence? After searching, I have only found ways to modify the log using logging.properties. I am not married to my current implementation, but I am interested in making it work. thanks.

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  • Need help receiving ByteArray data

    - by k80sg
    Hi folks, I am trying to receive byte array data from a machine. It sends out 3 different types of data structure each with different number of fields which consist of mostly int and a few floats, and byte sizes, the first being 320 bytes, 420 for the second type and 560 for the third. When the sending program is launched, it fires all 3 types of data simultaneouly with an interval of 1 sec. Example: Sending order: Pack1 - 320 bytes 1 sec later Pack2 - 420 bytes 1 sec later Pack3 - 560 bytes 1 sec later Pack1 - 320 bytes ... .. . How do I check the incoming byte size before passing it to: byte[] handsize = new byte[bytesize]; as the data I receive are all out of order, for instance using the following the read all int: System.out.println("Reading data in int format:" + " " + datainput.readInt()); I get many different sets of values whenever I run my prog although with some valid field data but they are all over the place. I am not too sure how exactly should I do it but I tried the following and apparently my data fields are not receiving in correct sequence: BufferedInputStream bais = new BufferedInputStream(requestSocket.getInputStream()); DataInputStream datainput = new DataInputStream(bais); byte[] handsize = new byte[560]; datainput.readFully(handsize); int n = 0; int intByte[] = new int[140]; for (int i = 0; i < 140 ; i++) { System.out.println("Reading data in int format:" + " " + datainput.readInt()); intByte[n] = datainput.readInt(); n = n + 1; System.out.println("The value in array is:" + intByte[0]); System.out.println("The value in array is:" + intByte[1]); System.out.println("The value in array is:" + intByte[2]); System.out.println("The value in array is:" + intByte[3]); Also from the above code, the order of the values printed out with System.out.println("Reading data in int format:" + " " + datainput.readInt()); and System.out.println("The value in array is:" + intByte[0]); System.out.println("The value in array is:" + intByte[1]); are different. Any help will be appreciated. Thanks

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  • Ant build.xml requires user input, but Eclipse has no tty

    - by carneades
    I'm trying to better integrate Eclipse with my build.xml. My build file calls GNU Make for the native portion of the program, and the Makefile uses sudo to movethe compiled libs into system path. Unfortunately that requires entering a password, and Eclipse's terminal doesn't accept user input. So the result from running the build in eclipse is: [exec] sudo: no tty present and no askpass program specified [exec] make: *** [install] Error 1 Any way around this problem? Can the ant build be elevated to root some other way?

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  • Asynchronous Processing = Spanning Threads = Valid?

    - by jens
    Hello Experts, am I allowed (without any sideeffects) to create and start a new Thread() from within a doGet() Method of a servlet? Or does this somehow leak ressources? Is it valid to also pass the "Session" Object into the Thread to later save the result of my asynchronous processing (I will synchronized correctly) in the session? Or will this leak ressources when using the session "in indepedant threads"? = What would happen if the session meanwhile would be expired by the webcontainer as it has timedout and I will access it from my thread? Or would could this also lead to the sideffect, that storing the session in the thread will prevent the webcontainer from expiring the session at all (and therefore finally leak ressources as the sessions do not get cleared up)? (I know there are other Solutions, like working with DB-(Job)Records, JMS or Servlets 3.0) but I need so solve the problem as described by spanning a new Thread within doGet.) Thank you very much!! Jens

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  • Annotation to make available generic type

    - by mdma
    Given an generic interface like interface DomainObjectDAO<T> { T newInstance(); add(T t); remove(T t); T findById(int id); // etc... } I'd like to create a subinterface that specifies the type parameter: interface CustomerDAO extends DomainObjectDAO<Customer> { // customer-specific queries - incidental. } The implementation needs to know the actual template parameter type, but of course type erasure means isn't available at runtime. Is there some annotation that I could include to declare the interface type? Something like @GenericParameter(Customer.class) interface CustomerDAO extends DomainObjectDAO<Customer> { } The implementation could then fetch this annotation from the interface and use it as a substitute for runtime generic type access. Some background: This interface is implemented using JDK dynamic proxies as outlined here. The non-generic version of this interface has been working well, but it would be nicer to use generics and not have to create a subinterface for each domain object type. The actual type is needed at runtime to implement the newInstance method, amongst others.

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