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Java Error Subclasses


Follow us Core Java Enterprise Java Learn Java Mobile Java How-Tos Features News Blogs Resources Newsletters About Us Contact Privacy Policy Advertising Careers at IDG Site Map Ad Choices E-commerce Affiliate share|improve this answer edited Aug 9 '13 at 19:05 answered Aug 9 '13 at 18:59 JAVA 275413 add a comment| up vote 0 down vote If you take a look at All Rights Reserved. To be honest I have never understood how they did it, I just "let that happen" :p –fge Jan 7 '13 at 15:51 add a comment| up vote 5 down vote have a peek at this web-site

I have a good understanding of the Exception class, but can't find examples of code for the Error class. Some Differences Error is not meant to be caught, even if you catch it you can not recover from it. Does using documentation as a developer make me look unprofessional? I've tried searching the web and also the java.sun website, but I'm not finding anything useful to help me understand this better. http://stackoverflow.com/questions/14196820/why-do-we-need-error-class

Java Error Example

You might want to catch it in order to log it and then rethrow it (see the JavaDoc of ThreadDeath for an example on why you need to rethrow it (thanks This error is new in Java 1.1. Error are often fatal in nature and recovery from Error is not possible which is different in case of Exception which may not be fatal in all cases. VirtualMachineError - Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.

In this case, however, you must place the catch clause for TooColdException above the one for TemperatureException, or the source file won't compile. Java does distinguish between them as follows: you must declare a checked exception in your throws clause; if using a method which throws a checked exception in a try block, you StringIndexOutOfBoundsException This exception is thrown when a String or StringBuffer object detects an out-of-range index. Java Error Classes List You just shouldn't. –Jan Dvorak Jan 7 '13 at 13:19 While you rarely catch them, you would like to have some cleanup finally done anyway. –zch Jan 7 '13

A method is not required to declare in its throws clause any subclasses of Error that might be thrown during the execution of the method but not caught, since these errors Compiler will not throw compile time error if it doesn't see Error handled with try catch or finally block. Runtime exceptions The java.lang package defines the following standard runtime exception classes: ArithmeticException This exception is thrown to indicate an exceptional arithmetic condition, such as integer division by zero. Get More Information Sales tax rate for hotel in Washington DC What colour is the foliage if the sky is violet?

key point to remember is that Error are fatal in nature and recovery may not be possible, on the other hand by carefully handling Exception you can make your code more Java Error Class Not Found Exception AssertionError - Thrown to indicate that an assertion has failed. Classical examples of (in)famous unchecked exceptions: OutOfMemoryError (extends Error); StackOverflowError (extends Error); NullPointerException (extends RuntimeException); IllegalArgumentException (extends RuntimeException); etc etc. How bad is it to have multiple devices with the same SSH server keys?

Types Of Errors In Java

For example during OutOfMemoryError, if you catch it you will get it again because GC may not be able to free memory in first place. The try block places a fence around a bit of code that is under the watchful eye of the associated catchers. Java Error Example An Error is a specific kind of Throwable, just as Exception is. Java Errors List Note that the detail message associated with cause is not automatically incorporated in this error's detail message.

whereas for Exception, the javadoc says The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch. Check This Out On the other hand Unchecked Exception, which are subclass of RuntimeException mostly represent programming errors. How do we know that the next generation will be better? Some IDEs (Intellij IDEA comes to mind) will also yell at you if you catch an Error but do not rethrow it. Error In Java

InstantiationError This error is thrown in response to an attempt to instantiate an abstract class or an interface. NoSuchFieldException This exception is thrown when a specified variable cannot be found. Example: OutOfMemoryError - Not much you can do as your program can no longer run. Source Why does this C++ code crash at run time?

I think this makes the distinction clear. Define Inaccuracy Because of the unpredictable nature of these errors, methods that can throw objects that are instances of Error or one of its subclasses are not required to declare that fact in UnknownError This error is thrown when an error of unknown origins is detected in the run-time system.

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more hot questions question feed lang-java about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Such declaration required only for java.lang.Exception and subclasses, for java.lang.Throwable, java.lang.Error and java.lang.RuntimeException and their subclasses it is optional. Error and RuntimeException, along with all their subclasses, are unchecked exceptions -- no need to declare them in throw, shouldn't catch. –fge Jan 7 '13 at 13:36 Also see Java Error Application Blocked By Security Settings OTOH, for Exceptions, Java API says: The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

This constructor is useful for errors that are little more than wrappers for other throwables. Error is the "rare" case: it signifies problems that are outside the control of the usual application: JVM errors, out of memory, problems verifying bytecode: these are things that you should share|improve this answer edited Jan 7 '13 at 13:55 answered Jan 7 '13 at 13:46 rahulroc 8,02621937 thx for this huge reference..appreciate it.. –Anirudha Jan 7 '13 at 15:53 have a peek here VirtualMachineError - Thrown to indicate that the Java Virtual Machine is broken or has run out of resources necessary for it to continue operating.

Please click the link in the confirmation email to activate your subscription. In the object-oriented way of thinking, a TooColdException is a TemperatureException, therefore, a catch clause for TemperatureException also will catch a thrown TooColdException. Cited from Java's own documentation of the class Error. More like this Designing with exceptions Designing fields and methods Object finalization and cleanup Classic Tutorials for Java Beginners The basics of Java class loaders Object initialization in Java Exceptions in

This situation occurs when the current definition of the referenced class is incompatible with the definition of the class that was found when the referring class was compiled. IndexOutOfBoundsException The appropriate subclass of this exception (i.e., ArrayIndexOutOfBoundsException or StringIndexOutOfBoundsException) is thrown when an array or string index is out of bounds. Look at a few of the subclasses of Error, taking some of their JavaDoc comments: AnnotationFormatError - Thrown when the annotation parser attempts to read an annotation from a class file NoClassDefFoundError This error is thrown when the definition of a class cannot be found.

The only real difference between Error and RuntimeException is their estimated severity level, and is a "semantic" difference, not a technical difference: ultimately, both behave the same. How does osmosis work? They... Error The appropriate subclass of this error is thrown when an unpredictable error, such as running out of memory, occurs.

asked 3 years ago viewed 3806 times active 3 years ago Linked 0 When would we directly extend java.lang.Error?