Blue Jeans Interview Question for Principal Software Engineers


Country: India




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Class.forName() will load the driver into memory, If successful, the static initializer of the driver is called.

All JDBC Drivers have a static block that registers itself with DriverManager, something like below.

static {
    try {
        java.sql.DriverManager.registerDriver(new Driver());
    } catch (SQLException E) {
        throw new RuntimeException("Can't register driver!");
    }
}

JVM executes the static block and the Driver registers itself with the DriverManager.

In order to create the connection to the database, the DriverManager class has to know which database driver you want to use. It does that by iterating over the array of drivers that have registered with it and calls the acceptsURL(url) method on each driver in the array, effectively asking the driver to tell it whether or not it can handle the JDBC URL

- Vib March 22, 2015 | Flag Reply


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