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  • Exploring HTML 5 Forms

    One of the major initial goals of the HTML 5 effort was to update the core HTML form elements to reflect more contemporary thinking. Find out how well the HTML 5 specification has fulfilled that goal so far.

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  • Reporting what's not there

    It's easy to write queries that will show data in the database that matches a criteria. However, if no data in the database matches the criteria, it becomes more difficult. This article examines two different scenarios where it's necessary to create data in order to be able to report zero values in queries.

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  • Adobe vs. Apple is going to get uglier

    <b>Sure, It's Secure:</b> "Usually I write about security here, but Apple's iron-bound determination to keep Adobe Flash out of any iWhatever device is about to blow up in Apple's face. Sources close to Adobe tell me that Adobe will be suing Apple within a few weeks."

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  • Usenet's home shuts down today

    <b>The Register:</b> "Duke University in North Carolina is where Usenet began, and today the institution is shutting down its Usenet server. The college cites "low usage and rising costs" for the decision."

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  • The Power Behind Cloud Computing

    Virtually Speaking: As more enterprises move their apps to a cloud computing environment, data centers will grow bigger and bigger, and how they are powered will be critical. A recent report by Greenpeace International sheds some light.

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  • 10 (or so) of the Best Mobile Linux Apps

    <b>Linux.com:</b> "The coolest thing about mobile Linux is that hey, it's basically Linux. Developers used to Linux will find themselves at home with mobile Linux (especially if targeting x86). And, familiar Linux apps can probably run fine on a mobile Linux system, too."

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  • When to use @Singleton in a Jersey resource

    - by dexter
    I have a Jersey resource that access the database. Basically it opens a database connection in the initialization of the resource. Performs queries on the resource's methods. I have observed that when I do not use @Singleton, the database is being open at each request. And we know opening a connection is really expensive right? So my question is, should I specify that the resource be singleton or is it really better to keep it at per request especially when the resource is connecting to the database? My resource code looks like this: //Use @Singleton here or not? @Path(/myservice/) public class MyResource { private ResponseGenerator responser; private Log logger = LogFactory.getLog(MyResource.class); public MyResource() { responser = new ResponseGenerator(); } @GET @Path("/clients") public String getClients() { logger.info("GETTING LIST OF CLIENTS"); return responser.returnClients(); } ... // some more methods ... } And I connect to the database using a code similar to this: public class ResponseGenerator { private Connection conn; private PreparedStatement prepStmt; private ResultSet rs; public ResponseGenerator(){ Class.forName("org.h2.Driver"); conn = DriverManager.getConnection("jdbc:h2:testdb"); } public String returnClients(){ String result; try{ prepStmt = conn.prepareStatement("SELECT * FROM hosts"); rs = prepStmt.executeQuery(); ... //do some processing here ... } catch (SQLException se){ logger.warn("Some message"); } finally { rs.close(); prepStmt.close(); // should I also close the connection here (in every method) if I stick to per request // and add getting of connection at the start of every method // conn.close(); } return result } ... // some more methods ... } Some comments on best practices for the code will also be helpful.

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