Dealing with Exceptions in Functional Java

Dealing with Exceptions in Functional Java

Dealing with Exceptions in Functional Java. Exception handling is a mechanism used to handle disruptive, abnormal conditions to the control flow of our programs. Exception handling is specifically not handled in patterns like streams, so often your lambdas have to handle exceptions which makes them much uglier than they need to be.

Exceptions used to be very handy. When your application was broken down via functional decomposition, bubbling up exceptions to some level where they could be reasonably handled was important. Functional decomposition could lead to pretty deep nesting, and handling problems at each level was a major problem and source of errors.

With functional programming, functional decomposition is often replaced by action-based decomposition. You have specific action patterns such as map and filter that are chained together and your functions provide the specifics of each action. Perhaps your functions are further chains of actions, especially when your data is hierarchical in nature, but there’s no more arbitrary chopping up of functions based on ‘gut feel’ and having your functions nested ten or more deep.

But exception handling is specifically not handled in patterns like streams, so often your lambdas have to handle exceptions which makes them much uglier than they need to be.

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