How do I catch exceptions in groovy?

Catching Exceptions A try/catch block is placed around the code that might generate an exception. All of your code which could raise an exception is placed in the Protected code block. In the catch block, you can write custom code to handle your exception so that the application can recover from the exception.

What happens if your program does not catch an exception?

What happens if an exception is not caught? If an exception is not caught (with a catch block), the runtime system will abort the program (i.e. crash) and an exception message will print to the console. The message typically includes: name of exception type.

Why should you not catch exception?

catch(Exception) is a bad practice because it catches all RuntimeException (unchecked exception) too. This may be java specific: Sometimes you will need to call methods that throw checked exceptions. If this is in your EJB / business logic layer you have 2 choices – catch them or re-throw them.

How do you handle catching exception?

The try-catch is the simplest method of handling exceptions. Put the code you want to run in the try block, and any Java exceptions that the code throws are caught by one or more catch blocks. This method will catch any type of Java exceptions that get thrown. This is the simplest mechanism for handling exceptions.

How are exceptions handled in Groovy exception handling?

In the catch block we are just catching our exception and outputting a message that an exception has occurred. One can have multiple catch blocks to handle multiple types of exceptions. For each catch block, depending on the type of exception raised you would write code to handle it accordingly.

Can you use try and catch to catch an exception?

It works well if the division work well, but: We can use try and catch to catch the exception:

What does NaN Not a number mean in Groovy?

Being able to catch exceptions is important, but so is the ability to raise exceptions (or throw exceptions) as it is called in Groovy. If you pass a negative number to the Math.sqrt method, it will return a value called NaN Not A Number.

What does the finally block do in Groovy?

The finally block follows a try block or a catch block. A finally block of code always executes, irrespective of occurrence of an Exception. Using a finally block allows you to run any cleanup-type statements that you want to execute, no matter what happens in the protected code. The syntax for this block is given below.