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Questions tagged [checked-exceptions]

The exceptions that need to be declared in a method or constructor's `throws` clause if they can be thrown by the execution of the method or constructor and propagate outside the method or constructor boundary.

The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

The class Exception and any subclasses that are not also subclasses of RuntimeException are checked exceptions. Checked exceptions need to be declared in a method or constructor's throws clause if they can be thrown by the execution of the method or constructor and propagate outside the method or constructor boundary.

Details: http://docs.oracle.com/javase/7/docs/api/java/lang/Exception.html

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How to identify checked and unchecked exceptions in java?

While reading about exception, I will always come across checked exceptions and unchecked exceptions, So wanted to know how to distinguish that which is what? Edit: I want to know if i create any exception class then how can i create as a checked or…
GuruKulki
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Languages that use checked exceptions

I'm just curious, is there any other languages besides Java that uses checked exceptions ? I did try to find information about this but couldn't find any answers.
Christiaan
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How to throw an Exception when your method signature doesn't allow to throw Exception?

I have a method like this: public void getSomething(){ ... } I want to throw an Exception inside getSomething(). The compiler will not allow me to do that because my method doesn't allow Exception to be thrown in there. But I need to throw a…
Sean Nguyen
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Getting Mockito Exception : checked exception is invalid for this method

I have a method which I am trying to test public List getUsers(String state) { LOG.debug("Executing getUsers"); LOG.info("Fetching users from " + state); List users = null; try { users =…
sk17261205
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Checked vs. Unchecked Exceptions in Service Layer

I work on a project with a legacy service layer that returns null in many places if a requested record does not exist, or cannot be accessed due to the caller not being authorized. I am talking about specific records requested by ID. For instance,…
S73417H
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Why does the compiler allow throws when the method will never throw the Exception

I am wondering why the java compiler allows throws in the method declaration when the method will never throw the Exception. Because "throws" is a way of handling the exception (telling the caller to handle it). Since there are two ways of handling…
PsyAp
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Why is throwing a checked exception type allowed in this case?

I noticed by accident that this throw statement (extracted from some more complex code) compiles: void foo() { try { } catch (Throwable t) { throw t; } } For a brief but happy moment I thought that checked exceptions had…
Boann
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Checked vs Unchecked exception

What does the following quote mean? With an unchecked exception, however, the compiler doesn't force client programmers either to catch the exception or declare it in a throws clause. In fact, client programmers may not even know that the exception…
Laawanya
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Will a subclass catch block catch a checked parent exception?

I have a method with a checked exception for a parent class, which can throw exceptions of the type parent and subclass public void method() throws ParentException { if( false ) throw new ParentException(); else if( true ) throw new…
Sajhu
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What's the idea behind Kotlin removing checked exceptions?

And how do we handle this when we are calling a method in Java which throws exceptions ? my code is in kotlin and I am using a 3rd party library which is written in java. I call a method of this library which throws few custom exceptions in some…
user12297160
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Handling Java exceptions caught in constructors, with final members

I have some ugly code and want to refactor it: public class UdpTransport extends AbstractLayer { private final DatagramSocket socket; private final InetAddress address; private final int port; /* boolean dead is provided by…
fadedbee
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Good pattern? ... method() throws X

Some background, then some questions. I have only recently discovered that an interface (or class) may be generic in the type of (checked) exception that its methods may throw. For example: interface GenericRunnable { void…
user2357
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How to handle IOException in Iterable.forEach?

I am playing around with ways to write a set of objects to a file. Why does the below implementation using Iterable.forEach() not compile? In Eclipse, I get the message that an IOException is not being handled. This is particularly confusing since I…
Will Beason
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How to catch all checked exceptions (in a single block) in Java 6?

IMPORTANT: This question only relates to Java 6 (and below). The hierarchy here shows Java Exceptions are divided into two types: RuntimeException and [not a RuntimeException]: Would it not have been better to divide into something like…
Steve Chambers
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Hard time understanting checked & unchecked exceptions

I've already read everything I could about this and I still don't understand how to use checked and unchecked exceptions. I think I can't still grasp the concept. I've read around StackOverflow that it's better to use unchecked rather than checked…
JS Rolón
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