checked-exceptions

Application of @Sneaky Throws in lombok

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To add to the existing answers. I personally dislike checked exceptions. See for more info: https://phauer.com/2015/checked-exceptions-are-evil/ To add insult to injury, the code gets bloated when avoiding the checked exceptions. Consider the usage of @SneakyThrows: List<Instant> instantsSneaky = List.of(“2020-09-28T12:30:08.797481Z”) .stream() .map(Example::parseSneaky) .collect(Collectors.toList()); @SneakyThrows private static Instant parseSneaky(String queryValue) { return new SimpleDateFormat(“yyyy-MM-dd’T’HH:mm:ss.SSS’Z'”).parse(queryValue).toInstant(); } versus non-@SneakyThrows … Read more

How to wrap checked exceptions but keep the original runtime exceptions in Java

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I use a “blind” rethrow to pass up checked exceptions. I have used this for passing through the Streams API where I can’t use lambdas which throw checked exceptions. e.g We have ThrowingXxxxx functional interfaces so the checked exception can be passed through. This allows me to catch the checked exception in a caller naturally … Read more

Why is catching checked exceptions allowed for code that does not throw exceptions?

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Quoting the Java Language Specification, §11.2.3: It is a compile-time error if a catch clause can catch checked exception class E1 and it is not the case that the try block corresponding to the catch clause can throw a checked exception class that is a subclass or superclass of E1, unless E1 is Exception or … Read more

How can I throw CHECKED exceptions from inside Java 8 lambdas/streams?

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The simple answer to your question is: You can’t, at least not directly. And it’s not your fault. Oracle messed it up. They cling on the concept of checked exceptions, but inconsistently forgot to take care of checked exceptions when designing the functional interfaces, streams, lambda etc. That’s all grist to the mill of experts … Read more

Java 8: Mandatory checked exceptions handling in lambda expressions. Why mandatory, not optional?

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Not sure I really answer your question, but couldn’t you simply use something like that? public final class SupplierUtils { private SupplierUtils() { } public static <T> Supplier<T> wrap(Callable<T> callable) { return () -> { try { return callable.call(); } catch (RuntimeException e) { throw e; } catch (Exception e) { throw new RuntimeException(e); } … Read more

Why is “throws Exception” necessary when calling a function?

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In Java, as you may know, exceptions can be categorized into two: One that needs the throws clause or must be handled if you don’t specify one and another one that doesn’t. Now, see the following figure: In Java, you can throw anything that extends the Throwable class. However, you don’t need to specify a … Read more

When to choose checked and unchecked exceptions

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Checked Exceptions are great, so long as you understand when they should be used. The Java core API fails to follow these rules for SQLException (and sometimes for IOException) which is why they are so terrible. Checked Exceptions should be used for predictable, but unpreventable errors that are reasonable to recover from. Unchecked Exceptions should … Read more

How can I throw CHECKED exceptions from inside Java 8 streams?

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The simple answer to your question is: You can’t, at least not directly. And it’s not your fault. Oracle messed it up. They cling on the concept of checked exceptions, but inconsistently forgot to take care of checked exceptions when designing the functional interfaces, streams, lambda etc. That’s all grist to the mill of experts … Read more

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