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December 2022

How to Avoid java.util.concurrent. TimeoutException

The java.util.concurrent.TimeoutException is a checked exception in Java that is thrown when a blocking operation times out. Since java.util.concurrent.TimeoutException is a checked exception, it must be explicitly handled in methods which can throw this exception - either by using a try-catch block or by throwing it using the throws clause.

How to Resolve NameError: Uninitialized Constant in Ruby

A NameError is raised when a referenced variable or a constant, such as a module, a class, or a constant variable, isn't defined or is invalid. The Uninitialized Constant error is a variation of the NameError exception class and has several reasons to occur. When this error occurs, several class names appear in place of Something.

What is Migration in Rails?

Migration in Rails is a tool that allows the developer to use Ruby to change an application's database schema. Instead of using SQL scripts, we use Ruby code, which is database independent, so it is easy to move the application to a completely new platform. We define these database changes in domain-specific language (DSL), and these migrations can be rolled back and managed along with the application source code.