Why is try catch necessary in jdbc

For example, say the catch for ArithmeticException must come before the catch for Exception. Something like that. In this section, we reviewed how to handle exceptions in Java using a built-in approach. Now, let's have a look at how to do it with the Vavr library. We reviewed a standard way of catching Java exceptions.

Another approach is to use the Vavr Try class. First, add the Vavr library dependency:. Vavr includes Try class that is a monadic container type, which represents a computation that may either result in an exception, or return a successfully computed value. This result can be in the form of Success or Failure. Take a look at this code:. In calling this code, we will use the try-catch blocks to handle DatabaseAccessException. But another solution is to refactor it with Vavr.

Check out this code snippet:. Note that Vavr. Try , as Vavr. Option , offers us a handy getOrElse method where we put a default value in case of failure. That means that because we hardcoded a failure in the find method, we receive a default value.

Instead of returning a default value, we can do other things with a result in case of error. You can chain functions with Option that makes your code much more functional:. Generally speaking, Vavr Try is a feature-rich solution that you can use in order to transform your codebase in a more functional way.

No doubt it's real power is unleashed in combination with other Vavr classes, like Option or Collections. But anyhow, even without them, Vavr Try is a real alternative for Java try-catch blocks if you want to write more functional-style code. An exception handling mechanism in Java is commonly associated with the try-catch block that we use in order to catch an exception and to provide logic that would be executed when an exception occurs.

In this post, we explored how to do so using the Vavr library. Using Java Optional Vs. Vavr Option. Published at DZone with permission of Yuri Mednikov. See the original article here. Thanks for visiting DZone today,. Edit Profile. In this clause we catch but discard any exceptions that may occur as we attempt to clean up the resources we've used.

It looks like you get your database connection from an imported class named ConnectionPool? It looks like the pool lets you get a connection, and then later it looks like you "free" the connection? Anatoly Shamov 2, 1 1 gold badge 15 15 silver badges 24 24 bronze badges.

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Now live: A fully responsive profile. Visit chat. Linked 5. Related When an exception condition occurs, an exception is thrown. The term thrown means that current program execution stops, and the control is redirected to the nearest applicable catch clause.

If no applicable catch clause exists, then the program's execution ends. An SQLException can occur both in the driver and the database.