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Thread: Database and Hibernate connection problem

  1. #1
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    Default Database and Hibernate connection problem


    I'm using Netbeans 7.4 - GUI is hand-coded, JavaDB using Embedded Connection. The project I'm working on is an SE desktop distributable application but it is NOT a CRUD.

    I'm having problems using Hibernate to create POJOs of the data in the database. I have researched but I can't find the relevant info to use Hibernate in this scenario. Could someone point me in the direction for the solution to this please.

  2. #2

    Default Re: Database and Hibernate connection problem

    The problem was that just typical Hibernate session did not throw any exception while using it without database connected. But this piece of code does throw an exception when database not connected (so it can be used as a test):

    Properties p = hibernateConnection.getCfg().getProperties();

    String url = p.getProperty("hibernate.connection.url");
    String user = p.getProperty("hibernate.connection.username");
    String password = p.getProperty("hibernate.connection.password");

    DriverManager.getConnection(url, user, password).close();
    So, simple try-catch can be used. If an exception is caught, connection is dead.

    I used this for regular checking of database connection. On application deploy, a TimerTask is scheduled to run every minute. When it catches an exception, it sets a static variable dbAvailable to false (otherwise to true). This variable is being checked on every HTTP client request and if it's true, error 503 is sent back in response.

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